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Main Power Distribution
The power distribution panel distributes electricity from the
external building power supply. It also houses a circuit
breaker for each module, a phase monitor, and an optional
main power disconnect switch. See below figure.
Figure 25. Power distribution panel
Panel Disconnect
Some 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
PPE for Arc/Flash Required!
Failure to wear appropriate PPE could result in death
or serious injury.
On this unit, if the handle shield is cracked the circuit
breaker could arc/flash when reset. To avoid being
injured, technicians MUST put on all necessary
Personal Protective Equipment (PPE), in accordance
with NFPA70E for arc/flash protection, PRIOR to
entering the starter panel cabinet.
NOTICE
Component Damage!
Failure to follow instructions could damage sensitive
electronic components beyond repair.
To prevent arcing or surges of electrical current, do
not use wires or cables to jump components or
bypass the manufacturer's safety systems.
ARTC-SVX009A-EN
Module Electrical and Control Panel
The Electrical and Control Panel receives power from the
power distribution panel and provides power to the
individual electrical components in that module.
Each module has its own high voltage electrical panel and
low voltage control panel that distributes electricity to
individual components. It also has fuses and breakers,
compressor switches, and the microprocessor controller.
Electrical Controls
The AXM heat pump is provided with controls and
indicators to monitor the electrical activity and notify
operators if problems arise.
Figure 26. Module electrical and control panel
Flow Switch
A flow switch is wired into the low voltage control circuitry
used to detect the flow of liquid throughout the hydronic
system. Flow switches are found on all BPHE with isolation
valves. Flow switches close when flow is detected allowing
compressors to start. If there is no flow, compressors
cannot operate.
After every heat pump powers on, all LEDs on the flow
switch illuminate and go out again in sequence. The switch
is ready for operation when an amber LED is visible on the
switch display:
Controls Interface
47
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