IM-1125-13 • REBEL ROOFTOPS
132
www.DaikinApplied.com
Maintenance
Servicing Refrigerant Sensors or Switches
Servicing Optional Electric Heater
If the electric heater is not operating properly, a qualified
electrician should perform the following to check if the heater is
damaged:
1 .
Measure continuity through all fuses.
2 .
Check that all electrical connections are tight. Look for
signs of arcing.
3 .
Check the resistance to ground for each circuit. It should
be infinite.
4 .
Check the resistance phase to phase for each circuit.
5 .
Check all contactors.
Servicing the Compressor Ground Fault
Interrupter
The Rebel 003–015 units are equipped with a ground fault
interrupter on the compressor(s). This is a two part device with a
current sensing donut on the power wires to the compressor(s)
and a PCB. The device is intended for personal safety by
continuously monitoring the balance between the three phase
power and the neutral conductor. It is not intended to provide
overcurrent or short circuit protection to the equipment.
The device works by opening the 120V controls circuit in a fault
condition. An open condition on the ground fault interrupter
indicates the compressor has been grounded.
Figure 105: Ground Fault Interrupter
Phase Voltage Monitor (PVM)
The phase voltage monitor (
) is designed to
protect three-phase loads from damaging power conditions.
A microprocessor-based voltage and phase sensing circuit
constantly monitors the three-phase voltages to detect harmful
power line conditions. When a harmful condition is detected,
its output relay is deactivated after a specified trip delay (Trip
Delay). The output relay reactivates after power line conditions
return to an acceptable level for a specified amount of time
(Restart Delay). The trip and restart delays prevent nuisance
tripping due to rapidly fluctuating power line conditions.
There are two LEDs on the face of the PVM (“1” in
to indicate the following items in
Factory defaults should be: Voltage (VAC) – Matching unit
nameplate, Restart (sec) – 100, Unbalance trip (%) – 4%, Trip
Delay (sec) – 5
Figure 106: Phase Voltage Monitor
Table 40: LED Indication
Status
LED Indicator
Normal operation, no faults, relay
energized
Green LED - steady on
Loss of input phase (relay de-
energized)
Red LED - flash twice, off, flash twice,
off, etc.
Voltage unbalance (relay de-
energized)
Red LED - flash twice, off, flash twice,
off, etc.
High or low voltage (relay de-
energized)
Red LED - steady on
Phase reversal (relay de-energized)
Red LED - pulse on, off, on, off, etc.
Restart delay (fault cleared, PVM
pending restart, relay de-energized)
Green LED - pulse on, off, on, off, etc.
Other features:
• Standard 2% to 8% variable voltage unbalance (“3” in
).
• Standard 1 to 500 second variable restart delay (“2”).
• Standard 1 to 30 second trip delay (“4”) (except loss of
phase, which trips at 1 second non-adjustable).
CAUTION
Severe loss of charge may occur if the high refrigerant
pressure switch is replaced before reclaiming the
refrigerant .
Replace pressure switch after reclaiming refrigerant.
DANGER
Hazardous voltage . May cause severe injury or death .
Disconnect electric power before servicing equipment. More than one
disconnect may be required to de-energize the unit.
