The McQuay Programmable Thermostat is an auto changeover, two stage heat, two stage cool thermostat.
The thermostat activates a heating appliance when the room temperature is below the set heat
temperature (by the differential temperature). The red status indicator may come on with first or second
stage, depending on configuration. When it drops another two degrees, the second stage (auxiliary) heat is
activated. The heating is staged off when the room temperature increases.
When the room temperature is greater than the set cool temperature (by the differential temperature), the
first stage cooling device is activated. The green status indicator may come on with first or second stage,
depending on configuration. If the room temperature increases two more degrees, the second stage cooling
device will be activated. The cooling is staged off when the room temperature decreases.
The thermostat has the following operating modes: OFF, Heat, Cool, Cool and Heat, and Program mode. In
OFF mode, the thermostat will not turn on heating or cooling devices. The indoor fan can be turned on in all
operating modes using the fan switch. In the Heat mode, the thermostat controls the heating system. In the
Cool mode, the thermostat controls the cooling system. In the Cool and Heat mode, the thermostat controls
both the cooling and heating systems. In Program mode, the thermostat will automatically be controlled by
the set program. Program mode can function with Heat mode, Cool mode, Cool and Heat mode or OFF mode
(for Programmable fan option only). The clock display alternates with the set temperature display for Cool
and Heat mode.
The program schedule can be overridden by changing the set temperature ( or ). This puts the
thermostat into a 2-hour temporary hold. After 2 hours, it will automatically return to the program schedule.
The thermostat also has a button lockout feature. This enables the thermostat to be set to the proper mode
and temperature and locked so it cannot be tampered with.
Mode of Operation
