Lennox International Inc TUA60S, TUA125S, TUA45S, TUA100S Start-Upand Operation, Unit Start-Up

START-UP AND OPERATION

Unit Start-Up

FOR YOUR SAFETY READ BEFORE LIGHTING

!WARNING

Electric shock hazard. Can cause injury or death. Do not use this heater if any part has been under water. Immediately call a qualified service technician to in- spect the furnace and to replace any part of the control system and any gas con- trol which has been under water.

!WARNING

Danger of explosion. Can cause injury or product or property damage. If over- heating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off electri- cal supply.

!WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

!WARNING

Danger of explosion and fire. Can cause injury or product or property damage. You must follow these instructions exactly.

BEFORE LIGHTING smell all around the appliance area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

Use only your hand to push in or turn the gas control knob. Never use tools. If the knob will not push in or turn by hand, do not try to repair it, call a qualified service technician. Force or attempted repair may result in a fire or explosion.

These unit heaters are equipped with an automatic spark ignition system. There is no pilot. In case of a safety shutdown, move thermostat switch to OFF, then return the thermostat switch to HEAT position.

Operation for Honeywell VR8205 Series Gas Valve (Figure 11)

1- STOP! Read the safety information at the beginning of this section.

2- Set thermostat to lowest setting.

1HONEYWELL VR8205 SERIES GAS VALVE

MANIFOLD PRESSURE ADJUSTMENT SCREW

MANI-

FOLD

PRESS-

URE

TAP

ON

OFF

INLET

PRESSURE

TAP

GAS VALVE SHOWN IN OFF POSITION

FIGURE 11

3-Turn off all electrical power to appliance.

4-This appliance is equipped with an ignition device which automatically lights burners. DO NOT attempt to light the burners manually.

5-Turn the manual knob on gas valve clockwise to OFF. Do not force.

6-Wait five (5) minutes to clear out any gas. If you then smell gas, STOP! Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's instructions. If you do not smell gas, go to next step.

7-Turn manual knob on gas valve counterclockwise to ON.

8-Close the unit door.

9-Turn on all electric power to unit.

10- Set thermostat to desired setting.

11- The combustion air blower will start. The burners will light within 40 seconds.

12- If unit does not light first time (gas line not fully purged) it will attempt up to two more ignitions before locking out.

13- If lockout occurs, repeat steps 1 through 10.

14- If appliance still will not operate, follow the instructions “To Turn Off Gas to Unit" and call your service technician or gas supplier.

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