Heating Operation And Adjustments - Lennox LCH036 Installation Instructions Manual

WARNING
Danger of explosion. Can cause injury
or product or property damage. If
overheating occurs or if gas supply
fails to shut off, shut off the manual gas
valve to the appliance before shutting
off electrical supply.
WARNING
SMOKE POTENTIAL
The heat exchanger in this unit could be a source of
smoke on initial firing. Take precautions with re­
spect to building occupants and property. Vent ini­
tial supply air outside when possible.
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.
A-Placing Unit In Operation
WARNING
Danger of explosion and fire. Can cause
injury or product or property damage.
You must follow these instructions
exactly.
Gas Valve Operation for Honeywell VR8305Q (Figure
23) Series Gas Valve
1- Set thermostat to lowest setting.
2- Turn off all electrical power to appliance.
3- This appliance is equipped with an ignition device
which automatically lights the burner. Do not try to
light the burner by hand.
4- Open or remove the heat section access panel.
HONEYWELL VR8305Q SERIES GAS VALVE
HIGH FIRE
ADJUSTMENT
INLET
PRESSURE
TAP
Gas valve knob is shown in OFF position.
5- Turn the knob on the gas valve clockwise
Do not force.
6- Wait five minutes to clear out any gas. If you then
smell gas,
gas supplier from a neighbor's phone. Follow the gas
supplier's instructions. If you do not smell gas, go to
the next step.
7- Turn the knob on the gas valve counterclockwise
to ON. Do not force.
8- Close or replace the heat section access panel.
9- Turn on all electrical power to unit.
10- Set thermostat to desired setting.
11- The ignition sequence will start.
12- If the appliance does not light the 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 the appliance will not operate, follow the
instructions "Turning Off Gas to Appliance" and call
your service technician or gas supplier.
Turning Off Gas to Unit
1- If using an electromechanical thermostat, set to the
lowest setting.
2- Before performing any service, turn off all electrical
power to the unit.
3- Open or remove the heat section access panel.
4- Turn the knob on the gas valve clockwise
OFF. Do not force.
5- Close or replace the heat section access panel.

Heating Operation and Adjustments

(Gas Units)
A-Heating Sequence of Operation
1- On a heating demand the combustion air inducer
starts immediately.
Page 32
LOW FIRE
ADJUSTMENT
FIGURE 23
STOP! Immediately
to OFF.
call your
to