Trane Gas Unit Heaters Installation Manual download pdf (Page 27)

GLND-SVX01B-EN 27

Start-Up

Operation

Power Vented Duct Furnaces with

Intermittent (Spark) Pilot Ignition

Explanation of Controls

1. The duct furnace is equipped with a dual automatic gas

valve and electric ignition device (separate from the

gas valve on most models) which provide the following

functions:

a. The duct furnace is equipped with a power vent

system consisting of a power venter motor and

blower, pressure switch, and sealed flue collector in

place of the conventional draft diverter.

b. The power venter motor is energized by the room

thermostat on a call for heat. The pressure switch

measures the flow through the vent system and

energizes the indirect spark ignition system when

the flow is correct.

c. 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.

d. Pilot solenoid valve also functions as a main gas

valve to provide redundancy.

e. Pressure regulator provides proper and steady gas

pressure to the main burners.

f. Manual shutoff valve for service and long term

shut-down. (Separate from the automatic valve on

some models.)

2. The high 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

heate

r 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

tem

perature sensitive switch which operates the vent

system and ignition system; it turns the main gas valve

ON or OFF 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. 25).

Start-Up

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.

WARNING

Check and Test Safety Devices!

It is the installer’s responsibility to check all safety

controls! Check and test the operational functions of all

safety devices supplied with this unit, and ensure that

all are operating effectively. Failure to do so could result

in unsafe conditions and could result in death, serious

injury or property damage.

NOTICE:

Operate Unit within Specified Units!

Never operate the unit beyond the specified limits,

severe damage to, and/or premature failure of the unit

will result!

WARNING

Risk of Fire and Carbon Monoxide

Poisoning!

The pressure switch MUST NOT be bypassed. The unit

MUST NOT be fired unless the power venter is

operating. Failure to follow these recommendations

could result in death or serious injury.

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 Installation Manual Page 27

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