Indirect Gas-Fired Heating Start-Up; Tools Required - Trane RRU150F N Series Installation, Operation And Maintenance Manual

Indirect Gas-Fired Heating Start-Up

Important: The following procedure must be followed
for the unit heating section to function
properly. The following procedures are to
be performed after all electrical and gas
connections to the unit have been
completed and the outdoor air damper and
evaporator fan operation have been verified
and are operating satisfactorily.
Refer to "Sequence of Operation," p. 18
information.
Table 5. Gas heater operating data
Fuel
Minimum Supply Gas Pressure (in. wc)
Maximum Supply Gas Pressure (in. wc)
Maximum (High-Fire) Manifold Gas Pressure (in. wc)
Minimum (Low-Fire) Manifold Gas Pressure (in. wc)
Combustion Blower SuctionPressure (Min. to Max. With Gas Valve Closed) -4.3 to -2.5 in. wc
Minimum Flame Sensing Current
Normal Sensing Current Range
RRUCM Voltage Output Range to MGA (Vdc)
Flue Gas Temperature Rise Above Ambient (°F)
Flue Gas Content—% CO Natural Low/High
2
Note: Adjust the combination gas valve regulator gas valve to vary the manifold gas pressure and burner input within the range shown. Do not exceed
pressure as listed in this table, under any circumstances. Use combination readings (CO and O
RRU-SVX02F-EN

Tools Required

• Voltage meter (µA)
• Amp meter
• Gas pressure gauge (2)
• Temperature probe
• Service mirror
for additional
• Small refrigeration screwdriver
• 5/16-in. Nut driver
• 1/2-in. Open end wrench
Important: Remove the outdoor air inlet aluminum
mesh filters if they are not clean prior to
proceeding with burner start-up.
Heating Input Rate - BTUH
250,000 350,000
Natural Gas ONLY
7 7
14 14
3.9 4.8
0.041 0.058
-4.3 to -1.7 in. wc
1.5 Microamps DC
3.0 to 6.0 Microamps DC
2.0 to 4.0 2.0 to 5.2
180 to 200 280 to 300
6.0/9.5 6.0/9.5
and a flow meter to determine exact inputs.
2
400,000
7
14
5.0
0.058
-4.3 to -1.5 in. wc
2.0 to 8.0
350 to 370
6.0/10.5
35