Gas Heat Data - Trane Foundation GCC 090-150 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
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)
1/2" Pipe
15 76
30 52
45 43
60 38
75 35
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
0.50
0.55
0.60
0.65
Figure 12. Schematic diagram for field gas piping to units
1/8" NPT Test Plug
Gas Supply Line
Gas shuttoff (Field Supplied
outside unit cabinet.)
RT-SVX069D-EN
125,000
4.5/11.0
3.5
st
Stage)
-1.3 to -1.7
nd
Stage)
-1.3 to -1.7
(b)
Iron Pipe Size (IPS) Inches
3/4" Pipe
176
120
99
86
77
Field supplied ground
Union
180,000 225,000
4.5/11.0 4.5/11.0
3.9 3.6
-1.3 to -1.7 -1.1 to -1.5
-1.3 to -1.7 -1.1 to -1.5
5.0 Micro Amps DC
8.0 to 16 Micro Amps DC
230 to 300 F
7.0% to 8.0% (Natural Gas)
7.5% to 9.0% (Propane)
40° F
1" Pipe 1¼" Pipe
345 750
241 535
199 435
173 380
155 345
Multipliers
1.10
1.04
1.00
0.96
6" MIN
To Gas Train
Unit Access Hole
Drip Leg
Installation
250,000
4.5/11.0
3.5
-1.1 to -1.5
-1.1 to -1.5
1½" Pipe
1220
850
700
610
545
19