Lennox International Inc Lennox Unit, 15GCSX manual Unit Operation, Thermostat Operation

WARNING

Do not use this unit if any part has been under wa- ter. A flood−damaged unit is extremely dangerous. Attempts to use the unit can result in fire or explo- sion. A qualified service agency should be con- tacted to inspect the unit and to replace all gas controls, control system parts, electrical parts that have been wet orto replace the unit if deemed nec- essary.

Unit Operation

WARNING

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

FOR YOUR SAFETY READ BEFORE LIGHTING

BEFORE LIGHTING smell all around the unit 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 turn the gas control knob. Never use tools. If the knob will not turn by hand, do not try to repair it, call a qualified service technician. Force or at- tempted repair may result in a fire or explosion.

This unit is equipped with an automatic spark ignition sys- tem. There is no pilot. In case of a safety shutdown, move thermostat switch to OFF and return the thermostat switch to HEAT. An electro−mechanical thermostat is shown in figure 1. On units with electronic temperature controls, shut main disconnect off and back on to reset ignition control.

THERMOSTAT

HEAT COOL

5060 70 80

10 15 2025 30

FAN AUTO ON HEAT OFF COOL

Figure 1

To Place Unit into Operation:

1 − Turn off electrical power to unit.

2 − Set thermostat to lowest setting.

3 − Remove heat section access panel.

4 − Turn the gas valve knob to the ON position. Refer to figure 2.

5 − Replace heat section access panel.

6 − Turn on electrical power to unit.

7 − Set room thermostat to desired temperature. (If ther- mostat setpoint temperature is above room tempera- ture after the pre−purge time expires, main burners will light).

Honeywell VR8205 Series Gas Valve

GAS VALVE SHOWN IN OFF POSITION

Figure 2

To Shut Down:

1 − Set the thermostat to the lowest setting.

2 − Turn off electric power to unit.

3 − Remove heat section access panel.

4 − Turn the gas valve knob to the OFF position. 5 − Replace heat section access panel.

WARNING

Danger of explosion. Can cause injury or death. Do not attempt to light manually. Unit has a direct spark ignition system.

Thermostat Operation

There are many styles of thermostats. Though their ap- pearances may be different, there are many similarities. System Switch

The thermostat system switch allows you to choose whether you wish the unit to operate in either the HEAT or COOL mode. When the HEAT mode is selected, the unit will operate to satisfy a heating demand. When the COOL mode is selected, the unit will operate to satisfy a cooling demand. Some thermostats feature an AUTO system mode, which automatically switches between the HEAT and COOL modes to ensure comfort.

Fan Operation

The thermostat fan switch allows you to choose whether you wish the circulating air blower to operate in either the AUTO or ON mode. When the AUTO mode is selected, the circulating air blower will cycle on and off with the cool- ing or heating demand. When the ON mode is selected, the circulating air blower will operate continuously.

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