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

Start-Up

GKND-SVX01B-EN 27

Operation

Explanation of Controls (see Figure 20, p. 26)

1. Each Separated Combustion Unit Heater comes

equipped with a power vent system that consists of a

power venter motor and blower, pressure switch, and

sealed flue collector.

2. The power venter motor is energized by the room

thermostat when a demand for heat is sensed. The

pressure switch measures the pressure differential

between the air inlet and exhaust vent systems. If the

differential is correct, the indirect spark ignition system

is energized.

3. The indirect spark

ignition system consists of an

ignition module, a dual combination valve, and a

spark-ignited pilot burner. When the pressure switch is

closed, the pilot valve opens as a spark is generated to

light the pilot. When the flame is sensed by the flame

sensing circuit, the spark ceases, and the main gas

valve is opened to supply gas to the main burners.

Once the thermostat has been satisfied, the vent

system and gas valve are simultaneously de-

energized, stopping all gas flow to the unit.

4. The limit switch interrupts the flow of electric cur

rent to

the main gas valve if the unit heater becomes

overheated.

5. The fan switch delays the operation of the fan is

layed for approximately 45 seconds once the

thermostat is closed, and continues fan operation for

approximately 65 seconds after the thermostat opens.

Note: The star

t-up fan delay must not exceed 90

seconds from a cold start.

6. The wall thermostat, supp

lied optionally, is a

temperature sensitive switch that operates the vent

and ignition systems to control the temperature of the

space being heated.

Note: Th

e thermostat must be mounted on a vertical,

vibration-free surface, free from air currents,

and in accordance with the furnished

instructions.

Initial Lighting

1. Open the manual gas valve, in the gas supply line to the

unit heater. Loosen the union in the gas supply line to

purge it of air. Tighten the union and check for leaks.

2. Turn on the electrical power. The unit heater should

w be under the control of the thermostat. Set the

thermostat to its highest setting; the power venter

motor should start and burner ignition occur. Allow the

unit heater to operate until the fan starts, then set the

thermostat to its lowest setting. The burners and

power venter motor should stop operating

immediately while the fan continues to operate until

the fan time delay times out, shutting it off. Reset the

thermostat to the desired operational setting.

WARNING

Carbon Monoxide!

Never operate unit heaters if the power venter is not

operable. Your venting system must not be blocked by

any snow, snow drifts, or any foreign matter. Inspect

your venting system to ensure adequate ventilation

exists at all times! Failure to follow these

recommendations could result in death or serious

injury due to Carbon Monoxide Poisoning (symptoms

include grogginess, lethargy, inappropriate tiredness, or

flu-like symptoms).

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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