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Installation Electrical
Connecting Module Power and
Control Wires
Connections are made at the primary module, which
typically contains the power distribution panel .
WARNING
Proper Field Wiring and Grounding
Required!
Failure to follow code could result in death or serious
injury.
All field wiring MUST be performed by qualified
personnel. Improperly installed and grounded field
wiring poses FIRE and ELECTROCUTION hazards. To
avoid these hazards, you MUST follow requirements
for field wiring installation and grounding as
described in NEC and your local/state/national
electrical codes.
Heat Pump Module Main Power
Modular systems feature single-point power connection
from the utility service to the power distribution panel on the
primary module as standard. Main power phases A, B, and
C are connected to terminals A, B, and C respectively from
left to right. Some systems have individual power supplied
to each module in lieu of single point power.
Phase Monitor Installation
The heat pump is equipped with a phase monitor on the
power distribution panel. It communicates with the primary
microprocessor controller on the primary module electrical
and control panel via the ID8 terminal. Ensure that the
wiring from the primary microprocessor controller and
terminal blocks to the phase monitor are connected and
secure.
The phase monitor continuously monitors each of the three
phases. The microprocessor receives input from the phase
monitor indicating whether the voltage is within acceptable
values. The phase monitor is designed to protect against
under-voltage, voltage imbalance, phase loss, and phase
reversal.
Set voltage adjustment knob at the desired operating line
voltage for the equipment. This adjustment automatically
sets the under-voltage trip point. Check the phase monitor
after initial startup. If it fails to energize, (the LED glows red
or blinks) check the wiring of all three phases, voltage, and
phase sequence. If phase sequence is incorrect, the LED
flashes green/red. To correct this, swap any two line
18
voltage connections at the mounting socket. No further
adjustment should be required.
Power Interlock Switch
Some air-to-water heat pump systems are optionally
equipped with a panel-mounted disconnect switch installed
on the outside of the power distribution panel. The
disconnect switch must be turned to the off position before
the panel can be opened for service.
WARNING
Hazardous Voltage!
Failure to disconnect power before servicing could
result in death or serious injury.
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Verify that no power is
present with a voltmeter.
Single Point Connections
For systems with single point power connections, detach
the power cable on each module by cutting the wire tie
installed for shipping.
1. Uncoil the power cable and snake it through each
module to reach the power distribution panel.
2. Feed the taped end of the cable through the round
opening on the extreme left of the power distribution
panel.
3. Remove the tape and connect and tighten the cable
ends to the breaker corresponding to the module
number being connected. (For example, connect the
cable for module #9 to the breaker labeled #9.)
4. Connect the green ground lead to the ground lug at the
base of the enclosure.
5. Do not secure the ground wire until all of the ground
wires are connected to the ground lug and then each
can be tightened.
6. After connection, secure all power cables with standard
wire ties.
Module Control Wiring
The primary controller communicates with the secondary
controller in each heat pump module via a communication
circuit. Each secondary controller is wired back to the
Ethernet switch on the primary microprocessor controller.
ARTC-SVX006A-EN
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