User's Manual

34
During second stage compressor operation a “2” will be displayed with the HEAT or COOL
icon. This is displayed when the Thermostat is configured as H2, A2, or h2.
When the W is energized in a heat pump or Hybrid Heat system, the “auxiliary heat” icon will be
displayed.
Auto Changeover
When auto changeover mode is selected, a change from heat to cool (or vice versa) will not
occur until an opposite mode demand has existed for 20 minutes. If setpoint is changed, 20
minute requirement is deleted.
Emergency Heat Mode
When Thermidistat Control is configured as a heat pump and emergency heat is selected, all Y
signals are locked out, and W becomes energized upon a call for heat.
Programmable Fan
The fan output can be programmed based on period of the day. When programming for each day
and period the fan can be set to On or AUTO. If the fan button is pressed to change from On to
Auto or vice versa when programmable fan has been enabled, the manual change will only
remain in effect until the next program period, when the programmable fan setting will be
changed per the scheduled setting.
Dry Contact
On the Côr 7 series thermostats with the optional Two-Wire Relay Module, the dry contact that
can be used for control of an auxiliary device. The dry contact may be configured to be closed
for a specific number of minutes per hour for each period of the program schedule. This can be
used to operate a ventilator, damper, system blower, or other auxiliary device. There are two
terminals, D1 and D2.
On both the programmable and non--programmable models, when configured as a dehumidify
output, it will operate cooling equipment capable of dehumidify function. When configured for
dehumidification, the Rc terminal must be connected to one of the dry contact terminals. The
other dry contact terminal is connected to the dehumidify terminal on the furnace or fan coil.
This provides power to energize the dehumidify terminal on the cooling equipment when the dry
contact is closed.
If it is desired to operate a ventilator or other device, the D1 and D2 terminals can be connected
directly to the equipment. This will provide a closed contact for the specified number of minutes
per hour. See SW19.
If timed control of the system blower is required, the dry contact can be used for this function.
The G terminal can be connected to one of the dry contact terminals with the other terminal
being connected to Rc and/or Rh for timed control of the fan. Note that this is not the same as
programmable fan SW30.