Dry Contact Operation
(Setup Step 77 - 78)
Dry Contact Polarity (setup step 77)
Open (Normally Open) - The dry
contact is open until the connected
device closes the circuit.
Condensate Dry Contact Use (setup step 78)
If selected when the dry contact is active, the thermostat will lockout the
compressor terminal(s) and “CONDENSATE PAN OVERFLOW” will appear on
the display.
VACATION - If VACATION is selected when the dry contact is active, the
thermostat will be forced into AWAY/unoccupied settings.
FDD - If FDD is selected when the dry contact is active, the scrolling display will read
“Equipment fault”. This error message will disappear when the Dry Contact is idle.
Closed (Normally Closed) - The dry
contact is closed until the connected
device opens the circuit.
Dr
y
Contact
‘Idle’
‘Active’
Dr
y
Contact
Dr
y
Contact
‘Idle’
‘Active’
Dr
y
Contact
37
Installer Setup
Free Cooling
(setup steps 74 - 75)
To use Free Cooling, setup step 66 must be set to ‘FREE COOLING’.
Free Cooling is an energy saving way to boost the efficiency of your air
conditioning system by bringing in fresh air from the outside. The installation
of a Free Cooling damper and outdoor temperature sensor are required.
Free Cooling With A/C (Setup Step 74) - When the Aux Output is being used for
Free Cooling and an air conditioning system is present, set this step to ON. Fresh,
outside air may be used for first stage cooling in place of your air conditioner. If
your system does not have an air conditioner installed, set this step to OFF. This
will enable all stages of cooling to use only the Free Cooling damper.
Free Cooling Usable Temp (setup step 75) - This step allows the user to specify
the outdoor temperature below which Free Cooling can be utilized. For
example, if this step is set for 65 degrees, Free Cooling will be used until the
outdoor temp rises above 65. Temps are adjustable from 40˚ to 80˚ Fahrenheit.
Venting
To use Venting, setup step 66 must be set to ‘VENTING’.
The Venting feature allows your HVAC system to exhaust air from inside to the
outside, when there is a cooling call. Press FAN twice to activate Venting. While
Venting is active, heating and cooling are disabled. The installation of a Venting
damper will be required.
