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The remote thermostat interface terminal block is located on the main circuit board. A wiring harness is provided with
conductors for all applications (Heat Cool, Heat Pump, Multispeed Fan, etc.). It provides a connection for remote thermo-
stat and energy management inputs. To convert to thermostat operation:
1. In standby off mode, press MODE and WARM (+) buttons simultaneously for 3 seconds. The buzzer will chime and
LED display reads “ ” or “ ”.
: unit control panel has control of unit.
: wall thermostat has control of unit.
2. Make sure “ ” is selected. If not, toggle setting by pressing and holding the MODE and WARM (+) buttons simulta-
neously for 3 seconds.
3. Plug in the supplied thermostat harness.
4. Connect wires to field-supplied thermostat.
Remote Thermostat Interface
terminal r (red)
Low voltage terminal to supply voltage to an external
wall mounted thermostat. This terminal is capable of
supplying 100 mA at 18-30 Vac RMS over the entire
input voltage range specified.
terminal ls (purple)
When this low voltage terminal is connected to the R
terminal, the compressor and electric heater are disabled
to provide an energy management system interface.
terminal gh (green)
When this low voltage terminal is connected to the R
terminal, and the unit is in remote mode, the blower/fan
will be requested for operation on high speed.
terminal B (Blue)
When this low voltage terminal is connected to the R
terminal, and the unit is in the remote mode, the revers-
ing valve is energized. Hydronic and electric heat shall
be attempted as backups if the B terminal is asserted and
the compressor is locked out or disabled. This is subject
to the configured heat modes available.
terminal y (yellow)
When this low voltage terminal is connected to the R
terminal, and the unit is in remote mode, the compressor
will be switched on (the GL or GH terminal must also be
connected to the R terminal).
terminal w (white)
When this low-voltage terminal is connected to the R ter-
minal and the unit is in the remote mode, first hydronic
heat is attempted and electric heat is switched on as
backup (the GL or GH terminal must also be connected
to the R terminal). This is subject to the configured heat
modes available.
terminal gl (orange)
When this low voltage terminal is connected to the R
terminal, and the unit is in remote mode, the blower/ fan
will be requested for operation on low speed.
terminal c (Black)
Low voltage terminal, 24 Vac common, to provide oppo-
site polarity voltage to wall thermostat.
C
R LS
GH B
GL
Y W
Thermostat Terminal Block
Figure 44
