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2.3 CONNECTING 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 2-Pole circuit breaker
to the “Line 1A” and “Line 1B” connections on
contactor K1 in the PowerMaster assembly.
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 20-22 inch/
pounds.
2.3.2 LOAD #2 CONNECTION INSTRUCTIONS
If desired, a second load can be connected to contac-
tor K2 in the same manner.
•
•
2.4 CONNECTING 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.
•
•
Section 2 — Installation
PowerMaster Technical Manual
5