User's Manual

Setup
Heat Pump System Type Selection
To set the Thermostat for Heat Pump HVAC operation, change the Type in the Installer Settings – System
Settings – Mechanical Settings menu option to Heat Pump.
Changeover Type Selection
Most heat pump systems are designed to work normally in the heating mode and require a change over
output for cooling output. Change the C/O Type in the Installer Settings – System Settings – Mechanical
Settings menu option to match your system needs.
Changeover with Cooling: Set C/O Type to w/Cool (This is the default setting).
Changeover with Heating: Set C/O Type to w/Heat.
Note: during Heat Pump operation the changeover relay, once engaged, will stay on until the
opposite HVAC call occurs.
Check your HVAC system requirements for correct settings.
Minimum Run Time (MRT)
The thermostat has a Minimum Run Time after the start of any heat or cool call. This minimum run time
assures even heating and cooling cycles. Minimum Run Time will keep the system on even if you change
the setpoint to a temperature that would satisfy the call, until the MRT expires. Changing the Mode to
OFF will cancel the MRT and the system will turn off immediately. MRT can be adjusted in the Installer
Settings Menu of the THERMOSTAT.
Note: MRT status is shown in the thermostat System Status LED on-screen label.
Minimum Off Time (MOT)
The thermostat has a Minimum Off Time after any heat or cool call. This delay prevents rapid
heating/cooling cycles and also provides “short cycle protection” for compressor calls. This delay may be
noticeable when you change a setpoint and it does not respond immediately due to another call that has
recently completed and the MOT delay timer is preventing the restart of the system. The MOT delay time
can be adjusted in the Installer Settings Menu of the THERMOSTAT. There is a minimum of 5 minutes
delay to assure compressor protection.
Note: MOT status is shown in the thermostat System Status LED on-screen label.