8
Operation
In heating applications, as the temperature drops, the
thermostat heating contacts make to open a valve that
allows hot water to flow through the coil. On select models,
the speed at which the heat is circulated is controlled
manually by the fan switch.
In cooling applications, as the temperature rises, the
thermostat cooling contacts close to open a valve that
allows cold water to flow through the coil. Cooling mecha-
nism will not operate if manual switch is in the OFF
position. Models T4039D,H,K,M,S,V will also turn off
the heating valve when the manual switch is in OFF.
In manual changeover heating-cooling models, the
thermostat must be used with a remote changeover switch
or control to select the proper heating or cooling cycle
for the thermostat.
CALIBRATION
The T4039 is accurately calibrated at the factory under
controlled conditions. Do not attempt to field calibrate
this device.
Checkout
Home and Building Control Home and Building Control
Honeywell International, Inc. Honeywell Limited—Honeywell Limitée
1985 Douglas Drive North 35 Dynamic Drive
Golden Valley, MN 55422 Scarborough, Ontario
M1V 4Z9
Check the T4039 before leaving the installation. Raise
the temperature setting to start the heating cycle or lower the setting to start the cooling cycle. Check both cycles
on heating-cooling models.