Section 2 — Installation
PowerMaster Technical Manual
2.3CONNECTING THE SOURCE
VOLTAGE(S) AND LOAD(S)
The source voltage(s) are taken from the load center and connected to the PowerMaster assembly as fol- lows:
•Refer to the system diagram and the wiring dia- gram located in this manual.
•Refer to the field wiring decal on the inside of the enclosure cover for the contactor connection points and required tightening torque.
DANGER
Make sure to turn OFF both the UTILITY (NOR- MAL) and EMERGENCY (STANDBY) power sup- plies before trying to connect the source volt- ages and the loads. Supply voltages are high and dangerous. Contact with such high power supply lines will result in extremely hazardous, possibly lethal, electrical shock.
Do not turn these supplies back on until the PowerMaster installation has been completed in it’s entirety.
2.3.1 LOAD #1 CONNECTION INSTRUCTIONS
1.Select a 240V load to be automatically discon- nected by the PowerMaster assembly.
2.Remove the load connections from the 240V 2- Pole circuit breaker in the load center controlling the selected load.
3.Using a suitable wiring method, sized as 10AWG stranded wire, route the wiring between the load center and the load disconnect box. Using the ring lugs provided, connect the
When making the connections to the contactor, strip the 10AWG wire 0.312 inch (5/16”) and use an appropriate crimping tool to crimp the ring lugs.
4.Using the ring lugs provided, connect the load connections removed in step #2 above to the “Load 1A” and “Load 1B” connections on contac- tor K1.
Strip the wire 0.312 inch (5/16”) and use an appropriate crimping tool to crimp the ring lugs. Tighten the terminal screws to
2.4CONNECTING THE CONTROL
CIRCUITS
The PowerMaster Load center is controlled by a 24Vac control voltage. The most common application is to use the 24Vac control signal from a furnace or central air conditioning system, but any 24Vac con- trol signal may be used.
A total of two 24Vac control signals may be connected to the PowerMaster load center. Any time either of the two 24Vac control signals is active, both contactors will be energized disconnecting both of the selected loads.
The 24Vac control signals should be connected as follows:
•Refer to the system diagram and the wiring dia- gram located in this manual.
•Refer to the field wiring decal on the inside of the enclosure cover for the control signal connection points.
2.4.1 CONTROL CIRCUIT #1 CONNECTIONS
To prevent damage to the appliance control circuitry, or possible electrical shock, be sure to disconnect all power sources to the appliance before making these connections.
Do not restore power to the appliance until the PowerMaster installation has been completed in it’s entirety.
Using a minimum of 18AWG wire, connect the 24Vac control signal from the Air conditioner (or other high demand appliance) to the two 24Vac control circuit 1 connections on the terminal strip inside the PowerMaster assembly.
The 18AWG wire should be stripped to ¼ inch length before inserting into the terminal strip. Tighten the terminal strip clamping screws to 7 inch pounds.
2.4.2 CONTROL CIRCUIT #2 CONNECTIONS
If desired, a second 24Vac control signal can be con- nected to the PowerMaster assembly. The second control signal should be connected to the two 24Vac control circuit 2 connections on the terminal strip inside the PowerMaster assembly.
2.3.2 LOAD #2 CONNECTION INSTRUCTIONS
If desired, a second load can be connected to contac- tor K2 in the same manner.
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