thermostat will be listed with it's serial number and the label
Thermostat Setup.
Most
configuration items can be left at their default setting. For proper operation it is
necessary to set the correct System Type (Conventional or Heat Pump). If the Web
Application is not yet available, the System Type can be set directly using the
thermostat front keypad.
Setting System Type Using the Keypad
The thermostat can only be placed in configuration mode during the first minute after
the unit has been powered on. If the unit has already been running for longer than 1
minute, remove the front of the thermostat from it's base and then re-attach it. This
will cause it to recycle the power.
With the thermostat powered on, verify that the System Mode is “Off”, then press and
hold the up and down arrow keys simultaneously for 5 seconds. This will place the
thermostat in configuration mode and the display will change to show one of the 3
possible system type settings:
Conventional System (Default)
Heat Pump
“W” Terminal Controls Reversing Valve.
Energized for Cool.
Heat Pump
“W” Terminal Controls Reversing Valve.
Energized for Heat.
The system type can now be selected by pressing the up arrow key on the
thermostat. Once the correct setting has been selected, press any other button and
the thermostat will return to normal operation.
Alternate Limited Wiring Installation
Some installations may have limited in-wall wiring. In these cases the thermostat
can be specially configured to use only 3 wires. This configuration is accomplished
by removing the internal WM500 Wiring Module which is included in every
thermostat and installing it at the furnace location. This configuration can be used
when a Common wire is not available to power the thermostat or when a site is
upgrading a single stage system to a multi-stage system.
To remove the Wiring Module, start by loosening the R and Rc terminal screws and
removing the jumper between R and Rc. Loosen the three terminals on the Wiring
Module labeled R, C, and D. Slide the module to the right and remove from the rear
of the thermostat.
Install the Wiring Module inside the furnace using the standard terminal designations
shown above. In single transformer systems connect a jumper wire between R and
Rc on the Wiring Module.
Now connect the R, C, and D wires from the Wiring Module to the matching
terminals on the Thermostat using the existing in-wall wiring.
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