Trane Gas Unit Heaters Manuel d'installation télécharger pdf (Page 28)

Start-Up

28 GHND-SVX01C-EN

b. The indirect spark ignition system consists of an

ignition control module, a dual combination gas

valve, and a spark-ignited pilot burner. When the

pressure switch closes, the pilot valve opens and a

spark is generated to light the pilot burner. When

the flame sensing circuit senses that pilot flame is

established, the main gas valve is opened to supply

gas to the main burners. When the thermostat is

satisfied, the vent system is de-energized and both

valves are closed to stop all flow of gas to the unit.

2. The limit switch interrupts the flow of electric current to

the main gas valve in case the heater becomes

overheated.

3. The fan switch delays the operation of the fan

until the

heater is warmed, then keeps the fan running after the

gas has been turned off until the useful heat has been

removed. The start-up fan delay must not exceed

90 seconds from a cold start.

4. The wall thermostat (supplied optionally) is a

tempera

ture sensitive switch which operates the vent

system and ignition system to control the temperature

of the space being heated. It must be mounted on a

vibration free, vertical surface away from air currents,

in accordance with the instructions furnished with the

thermostat (also refer to “Installation: Electrical,”

p. 24).

Start-Up

Note: Also refer to the lighting instruction plate equipped

on the unit.

1. Open the manual valve supplying gas to the unit

heater, and with the union connection loose, purge air

from the gas line. Tighten the union and check for gas

leaks, using a soapy water solution only.

2. Open the manual valve on the unit heater.

3. Turn ON electrical power.

4. The unit should be under the control of the thermostat.

urn the thermostat to the highest point and determine

that the power venter motor starts and the pilot and

main burners ignite. Turn the thermostat to the lowest

point and determine that the power venter motor shuts

off and pilot and main burners are extinguished.

5. If pilot adjustment is required, remove the pilot

djustment seal cap and adjust the pilot screw to

obtain proper flame. Clockwise rotation decreases

pilot flame size. Replace the cap.

6. Turn the thermostat to

the desired position.

7. Refer to “Gas Input Rate,” p. 30 and “Gas Pressure

Adjustments,” p. 30 for more specifications.

Shut-Down

1. Turn the valve selector knob to the “OFF” position.

2. Turn off the electricity.

3. To relight, follow the instructions in “Start-Up,” p. 28

(preceding section).

See Figure 21, p. 29 for parts/identification.

NOTICE:

Additional Devices!

The addition of external draft hoods or power venters is

not permitted. Addition of such devices could cause

severe unit malfunction or failure!

WARNING

Hazard of Explosion!

Never use an open flame to detect gas leaks. Explosive

conditions may occur. Use a leak test solution or other

approved methods for leak testing. Before attempting

to light or relight the pilot, wait 5 minutes to allow gas

which may have accumulated in the burner

compartment to escape. Failure to follow

recommended safe leak test procedures or pilot

lighting/relighting instructions could result in death or

serious injury or equipment or property-only-damage.

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Trane Gas Unit Heaters Manuel d'installation Page 28

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