RTHC-SVN02C-EN
9
Wiring
Wiring can be completed once all of the components are installed.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power before servicing could
result in death or serious injury.
Connecting Supply Voltage to the 4U1
The controller requires 24 VAC to operate.
Note: If the module is factory installed, the power supply wiring will already be
connected.
1.
To connect the power to the module, use four-lead conductor wire, (X1906-0094-
010).
2.
Connect the red lead to the J2-4 on the 1U2 starter module.
3.
Connect the black lead to the J2-3 on the 1U2 starter module.
4.
Connect the other end of red lead to ACC in the 4U1 controller.
5.
Connect the other end of the black lead to AC in the 4U1 controller.
NOTE: Conduit is not required. Four-lead conductor wire is to be used X1906-
0094-010. Trim the two additional wires.
Wiring the Pressure Transducers to the 4U1 Module
1.
The transducer ships from the supplier with a four-wire cable and a ground. Only
2 wires and the ground will be used. Install a fork connector to the black lead,
red lead and the ground. The white and green leads are not used and can be cut
back out of the way.
2.
Prepare the wire leads for both transducers.
3.
Feed the leads through the lower bushing strain reliefs installed in the sheet
metal box.
4.
Connect the black lead of the transducer installed on the condenser to S1 - 4U1.
5.
Connect the red lead of the transducer installed on the condenser to TX1 - 4U1.
6.
Connect the ground of the transducer installed on the condenser to GND - 4U1.
7.
Connect the black lead of the transducer installed on the evaporator to S2 - 4U1.
8.
Connect the red lead of the transducer installed on the evaporator to TX2 - 4U1.
9.
Connect the ground of the transducer installed on the evaporator to GND - 4U1.
Connect the 4U1 Output to the Water Valve
The wiring between the 4U1 controller and the water valve is customer supplied. It is
class 2 wiring. It should not be run in conduit with higher voltage wire.
Important:
To avoid erratic control of the valve, do not run the signal wire between
the 4U1 controller and the water valve in conduit with voltages higher than 30 volts.
