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FIG. 2
First S S tage P P ipe S S izing
5 PSIG (345 MBAR) Inlet with a 1 PSIG (69 MBAR) Pressure Drop
Maximum capacity of pipe or tubing, in thousands of BTU/hr. (kilowatt hour) of propane gas.
IMPORTANT: If exact length is not on chart, use next longer length. Select the size of pipe that shows at least as much capacity as needed
for each piping section.
Pipe Size
In Inches (MM)
10 (3M)
1/2
2946
(12.7 MM)
(863 KW)
(593 KW)
3/4
6161
(19 MM)
(1805 KW) (1241 KW)
1
11605
(25.40 MM)
(3401 KW) (2338 KW) (1877 KW)
125 (38 M)
150 (45.7 M)
1/2
751
(12.7 MM)
(220 KW)
(200 KW)
3/4
1571
(19 MM)
(460 KW)
(417 KW)
1
2956
(25.40 MM)
(866 KW)
(786 KW)
* Total length of piping from outlet of first stage regulator to inlet of second stage regulator (or to inlet of second stage regulator furthest away).
1. Optional air diverters can be installed in the heater
outlet to provide direction to the heated air as it exits
the heater. Installation options include installing the
diverters in such a way as to broadly distribute the air
in two 45 degree paths or to focus the air flow in one
45 degree direction. See Fig. 3.
2. The air diverter's tabs on each half will pop into the
blower outlet between the inside of the case assembly
and the blower housing outlet. If the notched tabs do
not pop into the blower outlet, loosen (do not remove)
the blower outlet screws. Doing this provides a gap
into which you can insert the tabs. Retighten the
screws after installation.
Alternate Air Diverter Installations
Perform pipe sizing for building.
Total heat load is 300,000 BTUH (87930 WATTS).
Quantity 6 - 50,000 BTUH (14650 WATTS) heaters.
Building is 300 ft. (91 M) long x 40 ft. (12.2 M) wide.
Section
A - B
300,000 (87930)
B - C
200,000 (58620)
C - D
150,000 (43960)
D - E
100,000 (29310)
E - F
50,000 (14650)
B - G
100,000 (29310)
G - H
50,000 (14650)
20 (6 M)
30 (9 M)
40 (12 M)
2025)
1626
1392
(477 KW)
(408 KW)
4234
3400
2910
(997 KW)
(853 KW)
7976
6405
5482
(1607 KW) (1424 KW) (1290 KW)
175 (53.3 M)
200 (61 M)
681
626
583
(183 KW)
(171 KW)
1424
1310
1218
(384 KW)
(357 KW)
2682
2467
2295
(723 KW)
(673 KW)
EXAMPLE
BTUH (WATTS)
LP Gas Pipe Size
Gas Load
@ 5 PSI (345 MBAR)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
1/2 in. (12.7 MM)
Length of Pipe
In Feet* (Meters)
50 (15 M)
60 (18.3 M)
1233
1118
(361 KW)
(328 KW)
2579
2337
(756 KW)
(685 KW)
4859
4402
225 (68.6 M) 250 (76.2 M)
547
516
(160 KW)
(151 KW)
1143
1080
(335 KW)
(317 KW)
2153
2034
(631 KW)
(596 KW)
INSTALLATION INSTRUCTIONS
Appearance of the outlet on heater may vary from model to model.
FIG. 3
(Typical installation allowing two directions of air movement.)
TABS
DIVERTER
HALVES
70 (21.3 M)
80 (24.4 M)
90 (27.4 M)
1028
957
897
(301 KW)
(280 KW)
(263 KW)
2150
2000
1877
(630 KW)
(586 KW)
(550 KW)
4050
3768
3535
(1187 KW)
(1104 KW)
(1036 KW)
275 (83.8 M)
300 (91.4 M)
350 (107 M)
490
468
430
(144 KW)
(137 KW)
(126 KW)
1026
978
900
(301 KW)
(287 KW)
(264 KW)
1932
1843
1696
(566 KW)
(540 KW)
(497 KW)
AIR DIVERTER
Optional Accessory.
NOTCHES IN MOUNTING TABS
100 (30.5 M)
848
(249 KW)
1773
(520 KW)
3339
(979 KW)
400 (12.2 M)
400
(117 KW)
837
(245 KW)
1577
(462 KW)
OUTLET
SCREWS
FORMED
OUTLET GUARD
11
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