10
920-075-09
RT4 Digital Thermostat
Remote Thermostat and Low Voltage Control Connections
Remote Thermostat
All Friedrich Vert-I-Pak units units are factory configured to be
controlled by using a single stage remote wall mounted thermostat.
The thermostat may be auto or manual changeover as long as the
control configuration matches that of the Vert-I-Pak unit.
To control the unit with a wall-mounted thermostat:
1) Pull the disconnect switch.
2) Unscrew and remove the control box panel.
3) Run the wires through the top hole in the control box and
under the control components in the box to reach the
connection terminal for the wiring.
4) Make the wire connections, appropriately matching the
wires as the shown in the wiring diagram.
5) Once each wire is matched and connection the unit is
now controlled by the thermostat.
6) Reattach control box cover.
Low fan
High fan
Fan only
Temp
Power
Temp
Cool
Heat
Unit Control Panel (for easy servicing and diagnostics)
Thermostat Connections
C = Common Ground
W = Call for Heating
Y = Call for Cooling
R = 24V Power from Unit
GL = Call for Fan
GH = Call for Fan
B = Reversing Valve Energized in heating mode
*Connect either GL or GH terminal for fan. The Vert-I-Pak
control only provides one fan speed.
Cool Off Heat
Auto On
