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•
lf the length of line between regulators
(tank to building) is this long.
Total input
load (Btu/h)
on line
125,000
250,000
375,000
500,000
•
•
•
Before attempting to measure or adjust high fire manifold gas pressure, the inlet (supply)
pressure must be within the specified range for the gas being both used when the heater is in
operation and on standby. Incorrect inlet pressure could cause excessive manifold gas
LP Only: Use the following line size chart to size the gas piping or tubing
between the LP tank and the second-stage regulator:
Section 1
50'
75'
25'
100'
3/8" O. D. Copper
1/2" O. D.
3/8" O. D. Copper
Copper
1/2" O. D. Copper
1/2" O. D. Copper
Figure 12- LP Gas Pipe Sizing Information
LP Only: Seamless copper tubing may only be used with gases that are not
corrosive to it. See the note below to check with your LP gas supplier before
using copper. Seamless copper tubing must comply with standard type K or L
for seamless copper water tube, ASTM B 88; or seamless copper tube for air
conditioning field service, ASTM B 280.
LP Only: Copper and brass tubing and fittings (except tin lined) shall not be
used if the gas contains more than a trace (0.3 grains per cubic ft.) of
hydrogen sulfide gas. Check with your gas supplier.
LP Only:
-
TotalAire™ units - maximum supply pressure for liquefied petroleum
(LP) gas is 14" wc and minimum supply for purpose of input
adjustment is 11" wc.
-
Aura™ units – maximum supply pressure for liquefied petroleum (LP)
gas is 13.5" wc and minimum supply for purpose of input adjustment
is 11" wc.
Section 2
lf the length of line between second-stage
regulator and furnace is this long.
Total input
20'
30'
10'
load (Btu/h)
on line
75,000
5/8" O. D. Copper
5/8" O. D.
125,000
3/4" Black Pipe
Copper
187,500
3/4" Black Pipe
250,000
3/4" Black Pipe
3/4" Black
375,000
1" Black Pipe
Pipe
500,000
1" Black Pipe
Desert Aire - QS/QV Manual
40'
50'
29
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