Gas Heat Data - Trane Foundation GBC Series Installation, Operation And Maintenance Manual

Gas Heat Data

Table 3. Gas heater operating data
Heating Input Rate—Btu/h
Minimum Supply Gas Pressure Natural/LP
Manifold Gas Pressure (a)
Combustion Blower Suction Pressure (1
Combustion Blower Suction Pressure (2
Minimum Flame Sensing Current
Normal Sensing Current Range
Flue Gas Temperature Rise Above Ambient
Flue Gas Content - % CO
2
Natural LP
Minimum Supply Air Temperature Across Heat Exchanger
(a) Staged gas heat units have a positive pressure gas valve. Never adjust the staged gas pressure valve to a negative pressure.
(b) A voltage reading across pens (V+) and (V-) is equatable to the flame sensing current. One volt equals one micro amp.
Table 4. Piping
Length of Pipe (ft)
15
30
45
60
75
Note: Capacity of Pipe of Different Diameters and Lengths in Cu. Ft. Per Hr. with Pressure Drop of 0.3" and Specific Gravity of 0.60.
Table 5. Specific gravity multipliers
Specific Gravity
RT-SVX069A-EN
st
Stage)
nd
Stage)
(b)
1/2" Pipe 3/4" Pipe
76 176
52 120
43 99
38 86
77 155
0.50
0.55
0.60
0.65
125,000 180,000
4.5/11.0 4.5/11.0
3.5 3.9
-1.3 to -1.7 -1.3 to -1.7
-1.3 to -1.7 -1.3 to -1.7
5.0 Micro Amps DC
8.0 to 16 Micro Amps DC
Iron Pipe Size (IPS) Inches
1" Pipe
345
241
199
173
345
225,000
4.5/11.0
3.6
-1.1 to -1.5
-1.1 to -1.5
230 to 300 F
7.0% to 8.0%
7.5% to 9.0%
40° F
1¼" Pipe
750
535
435
380
545
Multipliers
1.10
1.04
1.00
0.96
I I n n s s t t a a l l l l a a t t i i o o n n
250,000
4.5/11.0
3.5
-1.1 to -1.5
-1.1 to -1.5
1½" Pipe
1220
850
700
610
19