4
CONTrOL WIrINg
• All wiring should conform to the National Electric Code and local
regulations
• Use copper conductors only
• Electrical leads should not be taut; allow slack for temperature
change and vibration
The wiring diagrams for the ERC-2 are shown below:
Figure. 7
Figure. 8
wiring installation Procedure
Accessing the terminals
1. Open the metal case to access the control connectors. The cable can
be disconnected from the display module while the control is being
wired. Reconnect the cable before using the unit.
Connecting the sensors
1. Connect the evaporator sensor to the lower terminal block in the
upper right corner.
2. Connect the zone sensor to the upper terminal block in the upper
right corner.
Figure. 9 – Sensor Connectors
Connecting the refrigeration/defrost equipment
1. Connect the wires from the compressor (including the thermostat)
to the correspondent terminal on the bottom side of the control
(Fig. 10 for quick connect version or Fig. 11 for terminal block version).
2. Connect the defrost device (heater or hot gas solenoid) to the
terminal in the control (Figs. 10 and 11).
3. Connect the wire from L1 - 120V AC or 208-240V AC line - to the
terminal marked as “COM”.
4. Connect also the fan wires to the terminals marked as “FAN”.
5. Use the alarm connections to connect an alarm to the control, as
shown in Figures 10 and 11.
Figure. 10 – load / AC input Connectors – Quick Connects
Figure. 11 – load / AC input Connectors – Terminal Blocks
Supplying Power to the Unit
1. The power input must be connected to the terminals on the left
side of the control (Figures 10 and 11). Connect the 120V AC L1 wire
(or 208-240V AC L1 wire) to the uppermost terminal and the
120V AC neutral (or 208-240V AC L2 wire) to the lowermost terminal.
2. The terminals in the middle are used to change the voltage of the
unit. Refer to the wiring diagram (Figures 7 and 8) to see how to
connect the jumpers for 120V AC or 208-240V AC
3. For the models supplied with a metal case, connect the ground wire
to the grounding lug on the bottom of the case.
Reconnecting the Display Module
1. Reconnect the display module cable to the control.
Figure. 12 – Display Module Cable
wiRiNG DiAGRAM
120V AC
208/240V AC