15
Use the following steps to complete the installation of the unit
gas piping. See Figure 8.
1. Install a tapped, style A (1/8 inch NPT tap) shut-off gas
cock at the end of the gas supply line near the unit. Be
sure the tapped gas cock is downstream of the pressure
regulator, if used.
Note:
The shut-off gas cock must be installed outside the
unit, and should meet the specifications of all applicable
National and Local Codes.
2. Install a ground union joint downstream of the shut-off
cock. This joint must be installed outside of the unit.
3. Install a drip leg (at least 150mm (six inches) in depth)
next to the union as shown in Figure 6. This drip leg is
required to collect any sediment that may be deposited in
the line.
4. Before connecting the piping circuit to the unit, bleed the
air from the supply line. Then cap or plug the line and test
the pressure at the tapped shut-off cock. The pressure
reading should not exceed 34.8 mbar (14 inches) water
column.
5. Connect the gas piping to the unit. Check the completed
piping for leaks using a soap and water solution, or
equivalent.
Figure 8 - Schematic Diagram of Gas piping to unit
Figure 7 - Trane Gas Heating Module Ignition Controler Start and Safety Sequence
Normal Sequence
Sequence With Safety Measures
(Stop by Regulation)
At Ignition with Flame Signal Fault
At Disappearance of Flame Signal
Time (s)
3 Retries 186.3 s
3 Retries 186.3 s
Operations
0
54
59.
7
60.
9
M
anuel
Regul
at
io
n
0
54
59.
7
62.
1
72min
etc..
0
0,
98
2
55
59.
7
62.
1
72min
etc..
Gas Valve
Fan
Electrode
Heating
Ionisation
TSA = 8,1s
TSE = 0,96S maxi
