Commercial Hydronic Radiators

Model  RC

Ceiling Radiators

Ceiling Panels

Ceiling style radiators provide heat in spaces with no available wall space, such as stairwells or entryways. They are also an excellent solution for large, open plan spaces such as maintenance buildings or sports facilities. Ceiling panel radiators are hung from threaded rods and hangers and project a minimum of 3″ from the finished ceiling. Typical available panel sizes are 2′ to 29′-6″ long by 3″ to 70″ wide.

Product Specifications

General:

Provide steel panel radiator elements of lengths and in locations as indicated, and of capacities, style and having accessories as scheduled. The ceiling hung heating panel radiation shall be of one-piece all-welded steel construction, consisting of flattened water tubes welded to headers at each end. The radiator shall include an integral heavy gauge (0.09” minimum) all-welded perforated side grilles.

The radiator’s headers shall include all necessary inlet, outlet and vent connections as required. Standard connection sizes are ó” NPT tapered thread for supply and return piping, and 1/8” for the vent connection. Internal baffling is provided where required for proper water flow. Optional.” connections shall be available at an additional cost.

The radiant heating panels shall be available in lengths from 2’-0” to 29’-6” in two inch even increments without the need for splicing. Appropriate ceiling mounting (typically threaded rod) shall be provided by the installing contractor. Panel radiation expansion shall not exceed 1/64” per foot of radiation at 215ºF. The installer shall provide adequate expansion compensation for each radiator.

The panel radiation shall be manufactured in the USA.

 

Pressure Ratings:

Pressure ratings for the radiation shall be as follows:

STANDARD: Working pressure-56 PSI maximum, Test Pressure-74 PSI maximum

OR

MEDIUM: Working pressure-85 PSI maximum, Test Pressure-110 PSI maximum

OR

HIGH: Working pressure-128 PSI maximum, Test Pressure 184 PSI maximum

 

Finishes:

The panel radiation shall be cleaned and phosphatized in preparation for the powder coat finish. The radiation is then finish painted with a gloss powder coat finish, for a total paint thickness of 2-3 mils (0.002” – 0.003”). The color shall be selected from Runtal’s ten Standard Colors; or Runtal Optional Colors shall be available at an additional cost.

 

Warranty:

All Runtal radiators are covered by a 5-Year Limited Warranty.

 

Manufacturer:

Subject to compliance with requirements, provide flat tube panel radiation as manufactured by Runtal North America, Inc.

 

OPTIONAL ITEMS WHICH MAY BE ADDED TO THE SPECIFICATION:

  1. Ribbed pipe cover trims, finished to match the radiators shall be provided with the radiation.
  2. The radiation manufacturer shall provide combination shutoff valve/union fitting of less than two inches in width for the supply and return to each panel radiator, to be field installed by others.
  3. Runtal-Flex connectors shall be used where appropriate to provide expansion compensation for the radiators.

 

Model Type RC
Quick Specifications


RC-3 with Both Side & Vertical Connections – Shown for Example Only

Panel Radiator Specification

1. Radiators are manufactured of cold rolled low carbon steel, fully welded and consisting of header pipes at each end, connected by flat oval water tubes.
2. Three tube thicknesses are available:
Standard Pressure – 0.048″ min wall thickness
Medium Pressure – 0.058″ min wall thickness
High Pressure – 0.078″ min wall thickness
3. Radiator header pipes are square 0.109″ min wall thickness and include all necessary supply, return, and air vent connections. Internal baffling is provided as required.
4. Standard piping connections are 1/2″ NPT taper threaded sockets, located in either side, or vertical positions. Optional 3/4″ NPT connections are available. Air vent connections are 1/8″ NPT taper threaded sockets.
5. Three working pressures are available:
Standard Pressure – 56 psi max (Tested at 74 psi)
Medium Pressure – 85 psi max (Tested at 110 psi)
High Pressure – 128 psi max (Tested at 184 psi)
6. Radiator expansion does not exceed 0.016 inch per linear foot at 215°F. Expansion compensation to be provided in the piping as required, by others.
7. Radiators are cleaned and phosphatized in preparation for the powder coat finish.
8. Radiators are painted with a gloss powder coat finish, for a total paint thickness of 2 to 3 mils (0.002″-0.003″).
9. Color of the finish paint shall be selected from available standard or optional colors prior to ordering.
10. Wall mounting brackets are provided with radiators, unless floor posts are specified.
11. Necessary wall support blocking for proper radiator mounting shall be by others.
12. Radiators are manufactured in the USA to the sizes, capacities, and quantities as shown on the plans and schedules.

Product Specifications (PDF)

BTUH/ft Ratings

Energy efficient as well as space saving, RC panel radiators are true radiant panels. These panels provide more comfort at a lower room temperature than convective heaters. Various average water temperatures (AWT) are included here for your convenience, but for more specific conditions use the appropriate correction factor with the 215°F rating. Please see the technical pages for the correction factor best suited to the design conditions.
BTUH/ft Ratings @ 65°F EAT
MODEL HEIGHT inches DEPTH inches 215°F 180°F 140°F
RC-2 5.7 1.6 270 190 110
RC-3 8.6 1.6 400 290 170
RC-4 11.5 1.6 530 380 220
RC-5 14.4 1.6 660 470 270
RC-6 17.3 1.6 800 560 320
RC-7 20.2 1.6 940 660 380
RC-8 23.1 1.6 1070 760 430
RC-9 26.0 1.6 1203 847 485
RC-10 29.0 1.6 1340 943 540

 

Overview (PDF)

Heating Capacity

Model Type RC
BTUH/ft Ratings

RC-3 with Both Side & Vertical Connections – Shown for Example Only

Technical Data For All RC Models Is Included Below

MODEL
TYPE
HEIGHT
H
BTUH/FT OUTPUT @ LISTED AWT & 65°F EAT DRY WT
lbs/ft
215°F 190 180 170 160 150 140 130 120
                       
RC-1 2-3/4″ 144 113 101 90 79 68 58 48 39 1.3
RC-2 5-3/4″ 271 213 191 169 149 1219 109 91 73 2.4
RC-3 8-5/8″ 401 315 282 250 220 190 162 134 108 3.5
RC-4 11-1/2″ 528 415 372 330 290 251 213 177 142 4.6
RC-5 14-3/8″ 659 517 464 412 362 313 266 220 177 5.7
RC-6 17-1/4″ 795 624 559 496 436 377 320 266 213 6.8
RC-7 20-1/4″ 932 731 656 582 511 442 375 311 250 8.0
RC-8 23-1/8″ 1067 837 751 667 585 506 430 357 287 9.1
RC-9 26-1/8″ 1203 944 847 752 660 571 485 402 323 10.2
RC-10 29″ 1340 1052 943 837 735 636 540 448 360 11.3
RC-11 31-7/8″ 1477 1159 1039 923 810 700 595 494 397 12.4
RC-12 34-7/8″ 1613 1266 1135 1008 885 765 650 539 433 13.5
RC-13 37-3/4″ 1750 1373 1232 1093 960 830 705 585 470 14.6
RC-14 40-5/8″ 1886 1480 1327 1178 1035 895 760 631 507 15.7
RC-15 43-5/8″ 2022 1586 1423 1263 1109 959 814 676 543 16.8
RC-16 46-1/2″ 2158 1693 1519 1348 1184 1023 869 721 580 17.9
RC-17 49-3/8″ 2293 1800 1614 1433 1258 1088 924 767 616 19.0
RC-18 52-3/8″ 2429 1907 1710 1518 1333 1152 979 812 653 20.1
RC-19 55-1/4″ 2566 2013 1806 1603 1408 1217 1034 858 689 21.3
RC-20 58-1/8″ 2700 2119 1901 1687 1481 1281 1088 903 725 22.4
RC-21 61″ 2837 2226 1996 1772 1556 1345 1143 948 762 23.5
RC-22 64″ 2971 2332 2091 1856 1630 1409 1197 993 798 24.6
RC-23 66-7/8″ 3107 2438 2187 1941 1704 1474 1252 1039 834 25.7
RC-24 69-3/4″ 3238 2541 2279 2023 1776 1536 1305 1083 870 26.8

NOTE: Heat Outputs for various AWT’s include 15% Heat Effect for placement along outside walls. Use the 215° F Output Rating with the Correction Factor for more specific design conditions. Medium Pressure increases Dry Weight by 10%, High Pressure increases Dry Weight by 15%

Heating Capacity (PDF)

Correction Factors

Correction Factors

EAT
AWT 45°F 50°F 55°F 60°F 65°F 70°F 75°F 80°F 85°F 90°F 95°F
240°F 1.365 1.350 1.304 1.266 1.220 1.171 1.124 1.086 1.039 1 0.953
235°F 1.343 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910
230°F 1.305 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868
225°F 1.267 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826
220°F 1.219 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785
215°F 1.171 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744
210°F 1.124 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704
205°F 1.086 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664
200°F 1.038 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625
195°F 1 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587
190°F 0.952 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549
185°F 0.910 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511
180°F 0.868 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474
175°F 0.826 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438
170°F 0.785 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403
165°F 0.744 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369
160°F 0.704 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334
155°F 0.664 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301
150°F 0.625 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269
145°F 0.587 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237
140°F 0.549 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207
135°F 0.511 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177
130°F 0.474 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149
125°F 0.438 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122
120°F 0.403 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096
115°F 0.369 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071
110°F 0.334 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50
105°F 0.301 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030
100°F 0.269 0.237 0.207 0.177 0.149 0.122 0.096 0.071 0.50 0.030 0.011
 
EXAMPLE: To find the BTUH/ft Rating for an RF-4 Panel at 145°F AWT and 65°F EAT, Multiply the Correction Factor (0.438) by the BTUH/ft Rating at 215°F (1351), e.g. (0.438) X (1351) = 592 BTUH/ft

Correction Factors (PDF)

Flow Rates

How To Determine Flow Rates

The flow rate through a Runtal radiator (or series of radiators) is dependent on the length of the radiator (or combined length of the radiator series), and the design Entering Water Temperature (EWT) and the design Leaving Water Temperature (LWT).

The designer picks the design EWT and LWT. For example, he might pick 170°F as the EWT and 150°F as the LWT. The median point between these two temperatures is called the Average Water Temperature (AWT), and in this example the AWT is 160°F.

The Runtal Heating Capacity charts are based on the heating capacity per foot of radiator, based on the designer’s chosen AWT, and this heating capacity per foot is expressed in units of BTUH/FT @ a given AWT. The required flow rate (GPM) is figured as follows:

Flow Rate = (Heating Capacity/Foot X Radiator Length)

DT –LWT) X 500]

The (EWT – LWT) is commonly referred to as the “Delta T”, or “DT”.

Therefore, our Flow Rate formula becomes:

GPM = (BTUH/FT X FT of Radiator) DT (DT X 500)

As an example, let’s say our designer needs 445 BTUH/FT capacity, over a
10′-0″ span of wall, and has chosen the design water temperatures as EWT = 170°F, and LWT = 150°F. This means our AWT is 160°F. Looking in the Runtal type “R” radiator Heating Capacity chart, we see that an R-4 radiator gives us the required 445 BTUH/FT at 160°F AWT. Therefore, the required flow rate for the 10′-0″ long R-4 radiator is:

GPM = (445 BTUH/FT X 10FT) DT (20°F DT X 500) = 0.445 GPM

Note that there are various combinations of EWT and LWT that can result in the same AWT. In our example above, for instance, a 180°F EWT and a 140°F LWT result in the same 160°F AWT. With Runtal’s unique flattened water tube design, Delta T’s of up to 60°F are possible without concern that the flow rate is too low for heat transfer (see the “Design Tips” section for more information).

As for a maximum flow rate for Runtal radiators, we recommend no more that 1.5 GPM per water tube. For our R-4 example above, this would mean a maximum flow rate of 6 GPM for an opposite end piped radiator, or 3 GPM for a same end piped radiator (see the “Design Tips” section for more information).

 

Piping Options

Piping Options

A Type Connections

Type
Supply Left
A Type
Supply Right
B Type Connections

Type
Supply Left
B Type
Supply Right
C Type Connections

Type
Supply Left
C Type
Supply Right
D Type Connections

Type
Supply Left
D Type
Supply Right
Opposite End Series

NOTES:

  • Air Vent standard on the Return side of each Panel
  • Lower Pressure Drop than Same End Series
  • Up to 7 Radiators (100 ft) in an Opposite End Series
  • Expansion Compensation Piping is Recommended
Same End Series

NOTES:

  • Same AWT over the entire Same End Series
  • Can Eliminate Costly Risers
  • Higher Pressure Drop than Opposite End Series
  • No More than 3 Radiators in a Same End Series
  • Expansion compensation Piping is Recommended

Piping Options

Piping Options: Type A, B, C, & D (PDF)

Pressure Drop: Opposite End Piping

Model Type RC
Pressure Drop: Opposite End

RADIATOR PRESSURE DROP – FOOT OF HEAD PER RADIATOR

 

RADIATOR MODEL
NUMBER OF TUBES FOR FLOW

CONNECTION PD

PER CONNECTION

STD
PRESSURE
TUBE

RF-1 RF-2 RF-3 RF-4 RF-5 RF-6 RF-7 RF-8 RF-9 RF-10 1/2″
CONN
PD
1 2 3 4 5 6 7 8 9 10
                         
  0.05 0.21 0.05 0.02 0.01 0.01 0.01 0.00 0.00 0.00 0.00 0.01
  0.75 0.45 0.12 0.05 0.03 0.02 0.01 0.01 0.01 0.01 0.01 0.01
  1.00 0.79 0.21 0.09 0.05 0.04 0.02 0.02 0.01 0.01 0.01 0.03
  1.50 1.72 0.45 0.21 0.12 0.08 0.05 0.04 0.03 0.02 0.02 0.04
  2.00 3.00 0.79 0.36 0.21 0.13 0.09 0.07 0.05 0.04 0.04 0.06
  2.50 461 1.21 0.55 0.32 0.21 0.15 0.11 0.08 007 0.05 0.08
  3.00 6.56 1.72 0.79 0.45 0.29 0.21 0.15 0.12 0.09 0.08 0.10
  3.50 8.83 2.32 1.06 0.61 0.40 0.28 0.21 0.16 0.13 0.10 0.15

GPM

4.00 11.42 3.00 1.37 0.79 0.51 0.36 0.27 0.21 0.16 0.13 0.18
  4.50 14.34 3.76 1.72 0.99 0.64 0.45 0.34 0.26 0.21 0.17 0.20
  5.00 17.57 4.61 2.11 1.21 0.79 0.55 0.41 0.32 0.25 0.21 0.25
  5.50 21.12 5.54 2.53 1.45 0.95 0.67 0.49 0.38 0.30 0.25 0.28
  6.00 24.98 6.56 3.00 1.72 1.12 0.79 0.58 0.45 0.36 0.29 0.33
  6.50 29.15 7.65 3.50 2.01 1.31 0.92 0.68 0.53 0.42 0.34 0.37
  7.00 33.64 8.83 4.04 2.32 1.51 1.06 0.79 0.61 0.48 0.40 0.42
  7.50 38.43 10.08 4.61 2.65 1.72 1.21 0.90 0.69 0.55 0.45 0.50
  8.00 43.52 11.42 5.22 3.00 1.95 1.37 1.02 0.79 0.63 0.51 0.56
                         
MED
PRESSURE
TUBE
                     
                         
  0.05 0.46 0.12 0.06 0.03 0.02 0.01 0.01 0.01 0.01 0.01 0.01
  0.75 1.00 0.26 0.12 0.07 0.04 0.03 0.02 0.02 0.01 0.01 0.01
  1.00 1.75 0.46 0.21 0.12 0.08 0.06 0.04 0.03 0.03 0.02 0.03
  1.50 3.83 1.00 0.46 0.26 0.17 0.12 0.09 0.07 0.06 0.04 0.04
  2.00 6.67 1.75 0.80 0.46 0.30 0.21 0.16 0.12 0.10 0.08 0.06
  2.50 10.26 2.69 1.23 0.71 0.46 0.32 0.24 0.19 0.15 0.12 0.08
  3.00 14.59 3.83 1.75 1.00 0.65 0.46 0.34 0.26 0.21 0.17 0.10
  3.50 19.65 5.16 2.36 1.35 0.88 0.62 0.46 0.36 .28 0.23 0.15

GPM

4.00 25.42 6.67 3.05 1.75 1.14 0.80 0.59 0.46 0.37 0.30 0.18
  4.50 31.91 8.37 3.83 2.20 1.43 1.00 0.75 0.58 0.46 0.37 0.20
  5.00 39.10 10.26 4.69 2.69 1.75 1.23 0.91 0.71 0.56 0.46 0.25
  5.50 47.00 12.33 5.64 3.24 2.10 1.48 1.10 0.85 0.68 0.55 0.28
  6.00 55.60 14.59 6.67 3.83 2.49 1.75 1.30 1.00 0.80 0.65 0.33
  6.50 64.88 17.03 7.79 4.47 2.90 2.04 1.52 1.17 0.93 0.76 0.37
  7.00 74.86 19.65 8.98 5.16 3.35 2.36 1.75 1.35 1.08 0.88 0.42
  7.50 85.52 22.44 10.26 5.89 3.83 2.69 2.00 1.55 1.23 1.00 0.50
  8.00 96.87 25.42 11.62 6.67 4.34 3.05 2.27 1.75 1.39 1.14 0.56
                         
HIGH
PRESSURE
TUBE
                     
                         
  0.50 0.82 0.22 0.10 0.06 0.04 0.03 0.02 0.01 0.01 0.01 0.01
  0.75 1.79 0.47 0.22 0.12 0.08 0.06 0.04 0.03 0.03 0.02 0.01
  1.00 3.13 0.82 0.38 0.22 0.14 0.10 0.07 0.06 0.05 0.04 0.03
  1.50 6.84 1.79 0.82 0.47 0.31 0.22 0.16 0.12 0.10 0.08 0.04
  2.00 11.91 3.13 1.43 0.82 0.53 0.38 0.28 0.22 0.17 0.14 0.06
  2.50 18.33 4.81 2.20 1.26 0.82 0.58 0.43 0.33 0.26 0.22 0.08
  3.00 26.06 6.84 3.13 1.79 1.17 0.82 0.61 0.47 0.38 0.31 0.10
  3.50 35.09 9.21 4.21 2.42 1.57 1.10 0.82 0.63 0.51 0.41 0.15

GPM

4.00 45.40 11.91 5.45 3.13 2.03 1.43 1.06 0.82 0.65 0.53 0.18
  4.50 56.99 14.96 6.84 3.92 2.55 1.79 1.33 1.03 0.82 0.67 0.20
  5.00 69.84 18.33 8.38 4.81 3.13 2.20 1.63 1.26 1.01 0.82 0.25
  5.50 83.95 22.03 10.07 5.78 3.76 2.64 1.96 1.52 1.21 0.99 0.28
  6.00 99.30 26.06 11.91 6.84 4.45 3.13 2.32 1.79 1.43 1.17 0.33
  6.50 115.88 30.41 13.91 7.98 5.19 3.65 2.71 2.09 1.67 1.36 0.37
  7.00 133.70 35.09 16.04 9.21 5.99 4.21 3.13 2.42 1.93 1.57 0.42
  7.50 152.74 40.08 18.33 10.52 6.84 4.81 3.57 2.76 2.20 1.79 0.50
  8.00 173.01 45.40 20.76 11.91 7.75 5.45 4.05 3.13 2.49 2.03 0.56

RADIATOR PRESSURE DROP IS FOR THE ENTIRE RADIATOR; IT IS NOT PER FOOT OF RADIATOR

CONNECTION PRESSURE DROP FOR THE 3/4″ CONNECTION IS THE SAME AS THE 1/2″ CONNECTION

Pressure Drop: Opposite End (PDF)

Pressure Drop: Same End Piping

Model Type RC
Pressure Drop: Same End

RADIATOR PRESSURE DROP – FOOT OF HEAD PER RADIATOR

 

RADIATOR MODEL
NUMBER OF TUBES FOR FLOW

CONNECTION PD  

PER CONNECTION  

STD
PRESSURE
TUBE

RC-2 RC-4 RC-6 RC-8 RC-10 RC-12 RC-14 RC-16 RC-18 RC-20 1/2″
CONN
PD
RC-3 RC-5 RC-7 RC-9 RC-11 RC-13 RC-15 RC-17 RC-19 RC-21
1 2 3 4 5 6 7 4 4 5
                         
  0.05 0.21 0.05 0.02 0.01 0.01 0.01 0.00 0.01 0.01 0.01 0.01
  0.75 0.45 0.12 0.05 0.03 0.02 0.01 0.01 0.03 0.03 0.02 0.01
  1.00 0.79 0.21 0.09 0.05 0.04 0.02 0.02 0.05 0.05 0.04 0.03
  1.50 1.72 0.45 0.21 0.12 0.08 0.05 0.04 0.12 0.12 0.08 0.04
  2.00 3.00 0.79 0.36 0.21 0.13 0.09 0.07 0.21 0.21 0.13 0.06
  2.50 4.61 1.21 0.55 0.32 0.21 0.15 0.11 0.32 0.32 0.21 0.08
  3.00 6.56 1.72 0.79 0.45 0.29 0.21 0.15 0.45 0.45 0.29 0.10
  3.50 8.83 2.32 1.06 0.61 0.40 0.28 0.21 0.61 0.61 0.40 0.15

GPM

4.00 11.42 3.00 1.37 0.79 0.51 0.36 0.27 0.79 0.79 0.51 0.18
  4.50 14.34 3.76 1.72 0.99 0.64 0.45 0.34 0.99 0.99 0.64 0.20
  5.00 1757 4.61 2.11 1.21 0.79 0.55 0.41 1.21 1.21 0.79 0.25
  5.50 21.12 5.54 2.53 1.45 0.95 0.67 0.49 1.45 1.45 0.95 0.28
  6.00 24.98 6.56 3.00 1.72 1.12 0.79 0.58 1.72 1.72 1.12 0.33
  6.50 29.15 7.65 3.50 2.01 1.31 0.92 0.68 2.01 2.01 1.31 0.37
  7.00 33.64 8.83 4.04 2.32 1.51 1.06 0.79 2.32 2.32 1.51 0.42
  7.50 38.43 10.08 4.61 2.65 1.72 1.21 0.90 2.65 2.65 1.72 0.50
  8.00 43.52 11.42 5.22 3.00 1.95 1.37 1.02 3.00 3.00 1.95 0.56
                         
MED
PRESSURE
TUBE
                     
                         
  0.05 0.46 0.12 0.06 0.03 0.02 0.01 0.01 0.03 0.03 0.02 0.01
  0.75 1.00 0.26 0.12 0.07 0.04 0.03 0.02 0.07 0.07 0.04 0.01
  1.00 1.75 0.46 0.21 0.12 0.06 0.06 0.04 0.12 0.12 0.08 0.03
  1.50 3.83 1.00 0.46 0.26 0.17 0.12 0.09 0.26 0.26 0.17 0.04
  2.00 6.67 1.75 0.80 0.46 0.30 0.21 0.16 0.46 0.46 0.30 0.06
  2.50 10.26 2.69 1.23 0.71 0.46 0.32 0.24 0.71 0.71 0.46 0.08
  3.00 14.59 3.83 1.75 1.00 0.65 0.46 0.34 1.00 1.00 0.65 0.10
  3.50 19.65 5.16 2.36 1.35 0.88 0.62 0.46 1.35 1.35 0.88 0.15

GPM

4.00 25.42 6.67 3.05 1.75 1.14 0.80 0.59 1.75 1.75 1.14 0.18
  4.50 31.91 8.37 3.83 2.20 1.43 1.00 0.75 2.20 2.20 1.43 0.20
  5.00 39.10 10.26 4.69 2.69 1.75 1.23 0.91 2.69 2.69 1.75 0.25
  5.50 47.00 12.33 5.64 3.24 2.10 1.48 1.10 3.24 3.24 2.10 0.28
  6.00 55.60 14.59 6.67 3.83 2.49 1.75 1.30 3.83 3.83 2.49 0.33
  6.50 64.88 17.03 7.79 4.47 2.90 2.04 1.52 4.47 4.47 2.90 0.37
  7.00 74.86 19.65 8.98 5.16 3.35 2.36 1.75 5.16 5.16 3.35 0.42
  7.50 85.52 22.44 10.26 5.89 3.83 2.69 2.00 5.89 5.89 3.83 0.50
  8.00 96.87 25.42 11.62 6.67 4.34 3.05 2.27 6.67 6.67 4.34 0.56
                         
HIGH
PRESSURE
TUBE
                     
                         
  0.50 0.82 0.22 0.10 0.06 0.04 0.03 0.02 0.06 0.06 0.04 0.01
  0.75 1.79 0.47 0.22 0.12 0.08 0.06 0.04 0.12 0.12 0.08 0.01
  1.00 3.13 0.82 0.38 0.22 0.14 0.10 0.07 0.22 0.22 0.14 0.03
  1.50 6.84 1.79 0.82 0.47 0.31 0.22 0.16 0.47 0.47 0.31 0.04
  2.00 11.91 3.13 1.43 0.82 0.53 0.38 0.28 0.82 0.82 0.53 0.06
  2.50 18.33 4.81 2.20 1.26 0.82 0.58 0.43 1.26 1.26 0.82 0.08
  3.00 26.06 6.84 3.13 1.79 1.17 0.82 0.61 1.79 1.79 1.17 0.10
  3.50 35.09 9.21 4.21 2.42 1.57 1.10 0.82 2.42 2.42 1.57 0.15

GPM

4.00 45.40 11.91 5.45 3.13 2.03 1.43 1.06 3.13 3.13 2.03 0.18
  4.50 56.99 14.96 6.84 3.92 2.55 1.79 1.33 3.92 3.92 2.55 0.20
  5.00 69.84 18.33 8.38 4.81 3.13 2.20 1.63 4.81 4.81 3.13 0.25
  5.50 83.95 22.03 10.07 5.78 3.76 2.64 1.96 5.78 5.78 3.76 0.28
  6.00 99.30 26.06 11.91 6.84 4.45 3.13 2.32 6.84 6.84 4.45 0.33
  6.50 115.88 30.41 13.91 7.98 5.19 3.65 2.71 7.98 7.98 5.19 0.37
  7.00 133.70 35.09 16.04 9.21 5.99 4.21 3.13 9.21 9.21 5.99 0.42
  7.50 152.74 40.08 18.33 10.52 6.84 4.81 3.57 10.52 10.52 6.84 0.50
  8.00 173.01 45.40 20.76 11.91 7.75 5.45 4.05 11.91 11.91 7.75 0.56

RADIATOR PRESSURE DROP IS FOR THE ENTIRE RADIATOR; IT IS NOT PER FOOT OF RADIATOR

CONNECTION PRESSURE DROP FOR THE 3/4″ CONNECTION IS THE SAME AS THE 1/2″ CONNECTION

Pressure Drop: Same End (PDF)

Pressure Ratings

Pressure ratings for the radiation shall be as follows:

STANDARD: Working pressure-56 PSI maximum, Test Pressure-74 PSI maximum

MEDIUM: Working pressure-85 PSI maximum, Test Pressure-110 PSI maximum

HIGH: Working pressure-128 PSI maximum, Test Pressure 184 PSI maximum

 
Detailed Specifications (PDF)

Mounting Systems

RC panels are ceiling mounted with threaded rod, nuts and ceiling supports, which are supplied by others. Please see the RC technical pages for more complete mounting details.

Overview (PDF)

Ceiling Mounting

Model Type RC
Ceiling Mounting

86″ to 118″
[8]
Mounting Points
120″ to 152″
[10] Mounting
Points
154″ to 188″
[12] Mounting
Points
190″ to 222″
[14] Mounting
Points
224″ to 258″
[16] Mounting
Points
260″ to 290″
[18] Mounting
Points
292″ to 326″
[20] Mounting
Points
328″ to 354″
[22] Mounting
Points

Ceiling Mounting (PDF)

Warranty

All Runtal radiators are covered by a 5-Year Limited Warranty.

Warranty (PDF)

Colors & Finishes

The panel radiation shall be cleaned and phosphatized in preparation for the powder coat finish. The radiation is then finish painted with a gloss powder coat finish, for a total paint thickness of 2-3 mils (0.002” – 0.003”). The color shall be selected from Runtal’s ten Standard Colors; or Runtal Optional Colors shall be available at and additional cost.

Detailed Specifications (PDF)

Color Options 

Radiator Installation Instructions

Radiator Installation Instructions
Vertical & Ceiling Radiators

GENERAL NOTES – BOTH STYLES
Radiators are boxed together in as few crates as possible. A box of brackets is included as a separate piece, and it is marked to denote brackets. Inside the crates, each panel is wrapped in foam sheeting. Saving this foam to re-wrap the panel once it is wall mounted will protect it from construction site damage.

Each radiator is tagged with a label that indicates the project name, model type, color, connection code, bracket type & quantity and tag number. The tag number will usually designate a floor level and room number for easier placement on the job. Locate each radiator as required.


VERTICALLY MOUNTED RV RADIATORS
Carefully place each radiator face down on a smooth level surface (e.g. floor or table). Distribute the K11 wall brackets for each radiator. The tag on the radiator indicates the quantity of brackets. Mount the brackets securely on wall studs or solid backing, spacing them to match the horizontal wall mounting bars on the back side of the RV panel. There will be (2) K11 brackets per horizontal mounting bar. Make sure to mount the K11’s in far enough to avoid contact with the side perforated grille.

Allow a minimum of 3 inches below each panel radiator to facilitate cleaning and to assure proper output.


CEILING MOUNTED RC RADIATORS
RC model ceiling radiators do not come with any mounting brackets. Typically, installers use threaded rod with locking nuts to secure the panel to the ceiling structure. There are two mounting holes per cross-member stiffener on the back side of the radiator. Each of these mounting points should be used to suspend the radiator, to avoid sagging. It is typically easier to attach the threaded rods to the radiator before raising the assembly to the ceiling for final mounting. Once the radiator is securely fastened to the ceiling structure, adjust the nuts on the threaded rod to straighten and level the radiator. It is recommended to have at least 3 inches minimum from the face of the radiator to the finished ceiling above it. In cases where upward radiation from the back side of the radiator is undesirable, foil faced insulation can be placed in the cavities created by the perforated steel side channels.


ADDITIONAL INSTALLATION NOTES – BOTH STYLES
Thread the supply and return fitting into the connections on the radiator. The sealing tape or pipe dope used is the installer’s choice – make sure the connections are leak tight. One quarter turn past hand tight is usually sufficient. Each radiator needs to be fitted with a 1/8” air vent prior to startup.

Once the radiators are installed, the system can be tested to 50 psi. DO NOT OVER-PRESSURIZE THE RADIATORS as permanent damage may be done.

Standard Pressure Panels – Maximum 56 psi
Medium Pressure Panels – Maximum 85 psi
High Pressure Panels – Maximum 128 psi

Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.

When the system has been shown to hold 50 psi maximum air, the piping and radiators can be filled with water. As water fills the system and radiators, air is forced to the vent fittings. Vent as much air as possible before turning on the circulating pump(s).

With the system is filled, operate the circulator(s) to force the remaining air to the high points of the system. Turn off the circulator(s) to vent the panels. Each radiator should be individually bled of air. Once cold venting has been completed, heat the system to design temperature and repeat the venting procedure as many times as necessary to remove all air from the system.

Radiator Installation Instructions (PDF)

Operation & Maintenance

For R, RF, R2F, R3F, RV, RC, UFLT and ThermoTouch

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.
  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.
  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.
  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)
  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.
  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).
  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.
  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)
  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.

Operations & Maintenance (PDF)

Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.
  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.

  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.

  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Operations & Maintenance (PDF)

Product Specifications

General:

Provide steel panel radiator elements of lengths and in locations as indicated, and of capacities, style and having accessories as scheduled. The ceiling hung heating panel radiation shall be of one-piece all-welded steel construction, consisting of flattened water tubes welded to headers at each end. The radiator shall include an integral heavy gauge (0.09” minimum) all-welded perforated side grilles.

The radiator’s headers shall include all necessary inlet, outlet and vent connections as required. Standard connection sizes are ó” NPT tapered thread for supply and return piping, and 1/8” for the vent connection. Internal baffling is provided where required for proper water flow. Optional.” connections shall be available at an additional cost.

The radiant heating panels shall be available in lengths from 2’-0” to 29’-6” in two inch even increments without the need for splicing. Appropriate ceiling mounting (typically threaded rod) shall be provided by the installing contractor. Panel radiation expansion shall not exceed 1/64” per foot of radiation at 215ºF. The installer shall provide adequate expansion compensation for each radiator.

The panel radiation shall be manufactured in the USA.

 

Pressure Ratings:

Pressure ratings for the radiation shall be as follows:

STANDARD: Working pressure-56 PSI maximum, Test Pressure-74 PSI maximum

OR

MEDIUM: Working pressure-85 PSI maximum, Test Pressure-110 PSI maximum

OR

HIGH: Working pressure-128 PSI maximum, Test Pressure 184 PSI maximum

 

Finishes:

The panel radiation shall be cleaned and phosphatized in preparation for the powder coat finish. The radiation is then finish painted with a gloss powder coat finish, for a total paint thickness of 2-3 mils (0.002” – 0.003”). The color shall be selected from Runtal’s ten Standard Colors; or Runtal Optional Colors shall be available at and additional cost.

 

Warranty:

All Runtal radiators are covered by a 5-Year Limited Warranty.

 

Manufacturer:

Subject to compliance with requirements, provide flat tube panel radiation as manufactured by Runtal North America, Inc.

 

OPTIONAL ITEMS WHICH MAY BE ADDED TO THE SPECIFICATION:

  1. Ribbed pipe cover trims, finished to match the radiators shall be provided with the radiation.
  2. The radiation manufacturer shall provide combination shutoff valve/union fitting of less than two inches in width for the supply and return to each panel radiator, to be field installed by others.
  3. Runtal-Flex connectors shall be used where appropriate to provide expansion compensation for the radiators.

Product Specifications (PDF)

BTUH/ft Ratings

Heating Capacity

Correction Factors

Flow Rates

How To Determine Flow Rates

The flow rate through a Runtal radiator (or series of radiators) is dependent on the length of the radiator (or combined length of the radiator series), and the design Entering Water Temperature (EWT) and the design Leaving Water Temperature (LWT).

The designer picks the design EWT and LWT. For example, he might pick 170°F as the EWT and 150°F as the LWT. The median point between these two temperatures is called the Average Water Temperature (AWT), and in this example the AWT is 160°F.

The Runtal Heating Capacity charts are based on the heating capacity per foot of radiator, based on the designer’s chosen AWT, and this heating capacity per foot is expressed in units of BTUH/FT @ a given AWT. The required flow rate (GPM) is figured as follows:

Flow Rate = (Heating Capacity/Foot X Radiator Length)

DT –LWT) X 500]

The (EWT – LWT) is commonly referred to as the “Delta T”, or “DT”.

Therefore, our Flow Rate formula becomes:

GPM = (BTUH/FT X FT of Radiator) DT (DT X 500)

As an example, let’s say our designer needs 445 BTUH/FT capacity, over a
10′-0″ span of wall, and has chosen the design water temperatures as EWT = 170°F, and LWT = 150°F. This means our AWT is 160°F. Looking in the Runtal type “R” radiator Heating Capacity chart, we see that an R-4 radiator gives us the required 445 BTUH/FT at 160°F AWT. Therefore, the required flow rate for the 10′-0″ long R-4 radiator is:

GPM = (445 BTUH/FT X 10FT) DT (20°F DT X 500) = 0.445 GPM

Note that there are various combinations of EWT and LWT that can result in the same AWT. In our example above, for instance, a 180°F EWT and a 140°F LWT result in the same 160°F AWT. With Runtal’s unique flattened water tube design, Delta T’s of up to 60°F are possible without concern that the flow rate is too low for heat transfer (see the “Design Tips” section for more information).

As for a maximum flow rate for Runtal radiators, we recommend no more that 1.5 GPM per water tube. For our R-4 example above, this would mean a maximum flow rate of 6 GPM for an opposite end piped radiator, or 3 GPM for a same end piped radiator (see the “Design Tips” section for more information).

 

Pressure Drop: Opposite End Piping

Pressure Drop: Same End Piping

Pressure Ratings

Pressure ratings for the radiation shall be as follows:

STANDARD: Working pressure-56 PSI maximum, Test Pressure-74 PSI maximum

MEDIUM: Working pressure-85 PSI maximum, Test Pressure-110 PSI maximum

HIGH: Working pressure-128 PSI maximum, Test Pressure 184 PSI maximum

 
Detailed Specifications (PDF)

Mounting Systems

Ceiling Mounting

Finishes

The panel radiation shall be cleaned and phosphatized in preparation for the powder coat finish. The radiation is then finish painted with a gloss powder coat finish, for a total paint thickness of 2-3 mils (0.002” – 0.003”). The color shall be selected from Runtal’s ten Standard Colors; or Runtal Optional Colors shall be available at and additional cost.

Detailed Specifications (PDF)

Warranty

All Runtal radiators are covered by a 5-Year Limited Warranty.

Warranty (PDF)

Radiator Installation Instructions

Radiator Installation Instructions
Vertical & Ceiling Radiators

GENERAL NOTES – BOTH STYLES
Radiators are boxed together in as few crates as possible. A box of brackets is included as a separate piece, and it is marked to denote brackets. Inside the crates, each panel is wrapped in foam sheeting. Saving this foam to re-wrap the panel once it is wall mounted will protect it from construction site damage.

Each radiator is tagged with a label that indicates the project name, model type, color, connection code, bracket type & quantity and tag number. The tag number will usually designate a floor level and room number for easier placement on the job. Locate each radiator as required.


VERTICALLY MOUNTED RV RADIATORS
Carefully place each radiator face down on a smooth level surface (e.g. floor or table). Distribute the K11 wall brackets for each radiator. The tag on the radiator indicates the quantity of brackets. Mount the brackets securely on wall studs or solid backing, spacing them to match the horizontal wall mounting bars on the back side of the RV panel. There will be (2) K11 brackets per horizontal mounting bar. Make sure to mount the K11’s in far enough to avoid contact with the side perforated grille.

Allow a minimum of 3 inches below each panel radiator to facilitate cleaning and to assure proper output.


CEILING MOUNTED RC RADIATORS
RC model ceiling radiators do not come with any mounting brackets. Typically, installers use threaded rod with locking nuts to secure the panel to the ceiling structure. There are two mounting holes per cross-member stiffener on the back side of the radiator. Each of these mounting points should be used to suspend the radiator, to avoid sagging. It is typically easier to attach the threaded rods to the radiator before raising the assembly to the ceiling for final mounting. Once the radiator is securely fastened to the ceiling structure, adjust the nuts on the threaded rod to straighten and level the radiator. It is recommended to have at least 3 inches minimum from the face of the radiator to the finished ceiling above it. In cases where upward radiation from the back side of the radiator is undesirable, foil faced insulation can be placed in the cavities created by the perforated steel side channels.


ADDITIONAL INSTALLATION NOTES – BOTH STYLES
Thread the supply and return fitting into the connections on the radiator. The sealing tape or pipe dope used is the installer’s choice – make sure the connections are leak tight. One quarter turn past hand tight is usually sufficient. Each radiator needs to be fitted with a 1/8” air vent prior to startup.

Once the radiators are installed, the system can be tested to 50 psi. DO NOT OVER-PRESSURIZE THE RADIATORS as permanent damage may be done.

Standard Pressure Panels – Maximum 56 psi
Medium Pressure Panels – Maximum 85 psi
High Pressure Panels – Maximum 128 psi

Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.

When the system has been shown to hold 50 psi maximum air, the piping and radiators can be filled with water. As water fills the system and radiators, air is forced to the vent fittings. Vent as much air as possible before turning on the circulating pump(s).

With the system is filled, operate the circulator(s) to force the remaining air to the high points of the system. Turn off the circulator(s) to vent the panels. Each radiator should be individually bled of air. Once cold venting has been completed, heat the system to design temperature and repeat the venting procedure as many times as necessary to remove all air from the system.

Radiator Installation Instructions (PDF)

Operation & Maintenance

For R, RF, R2F, R3F, RV, RC, UFLT and ThermoTouch

Hydronic Radiator Operation

  1. Radiators are manufactured in the USA of cold rolled low carbon steel and should be used only in closed closed hydronic systems to assure no corrosion of any system components.
  2. Proper radiator operation depends on adequate flow of water to the panel, which can only be accomplished when all the system air has been fully vented from the panels.
  3. Radiators should each be vented, with the system pressurized but in a static state (pumps off). Venting may need to be done periodically to assure a closed system.
  4. DO NOT OVER-PRESSURIZE RADIATORS:
    Most radiators are standard pressure construction. Standard pressure radiators should be tested with NO MORE THAN 50 PSI.
  5. Radiator Operating Pressure Ratings:
    Standard Pressure – 56 psi max (Tested at 74 psi)
    Medium Pressure – 85 psi max (Tested at 110 psi)
    High Pressure – 128 psi max (Tested at 184 psi)
  6. Radiators expand a maximum of 0.016 inch per linear foot of length if heated to 215°F. Piping attached to the radiator must provide the necessary expansion compensation.
  7. Flexible piping and elbowed piping are two simple ways to provide the 1/8 inch to 1/2 inch (typical) of flexibility required in expansion situations (usually series piping).
  8. Runtal Radiators require less flow rate than other hydronic heating products. If flow noise is apparent, balance the system until the noise is reduced.
  9. For a delta T of 20°F. (T supply minus T return), divide the total Btu/hr capacity of the loop by 10,000. This gives the Flow Rate in gallons per minute (GPM)
  10. Many levels of control are available today for hydronic systems. Runtal Radiators will provide nice, even heating whether operated by a simple thermostat to baseboard loop system, or an advanced boiler reset controller with motorized mixing valves, constant circulation and 2-pipe distribution.

Operations & Maintenance (PDF)

Radiator Maintenance

  1. Hydronic system maintenance should include routine checks for piping leaks (usually indicated by frequent makeup water), and a yearly diagnosis of the system water pH to evaluate its corrosive potential.
  2. Internal radiator maintenance depends entirely on the system water makeup and proper venting. Hydronic system additives are available to passivate and protect against freezing. These additives will not significantly reduce the output of Runtal Radiators.

  3. External radiator maintenance consists of keeping the surfaces clean, and any paint nicks or deep scratches painted with touch-up to prevent any surface rust.

  4. Radiators can be painted after sanding with fine grit paper to dull the high gloss and by wiping with solvent or a tack rag. Use only oil-based enamel paint (alkyd, acrylic, urethane, epoxy) – do not use latex or lacquer paint. Use urethane or epoxy enamel for radiators located in harsh environments. Spray the paint to achieve an even coating, and let dry completely before heating the radiator.

Operations & Maintenance (PDF)