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Controls Interface
Figure 21. 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 (or on each module's
electrical and control panel if the heat pump has power
supplied directly to each individual module). 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.
Module Electrical and Control Panel
From the power distribution panel, power is fed to the
individual heat pump modules and connects to each
module's electrical and control panel. See the following
figure.
40
Electrical Controls
The AXM heat pump is provided with controls and
indicators to monitor the electrical activity and notify
operators if problems arise.
Figure 22. 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 brazed plate heat
exchangers 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 power-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:
ARTC-SVX006A-EN
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