High Pressure Switch
All Rebel Units will have a high pressure switch on each
compressor. Medium cabinet units (7–15 Tons) will have an
HP1 switch on the variable speed compressor (COMP1) and a
HP3 on the fixed speed compressor (COMP3). These switches
are normally closed devices that are brazed directly to the
refrigerant piping. When the pressure at the switch exceeds
580 PSIG the switch will open. This opening will interrupt the
control signal to the variable compressor drive or de-energize
the contactor coil on the fixed speed compressor, both acts
will shut down the compressors and generate an alarm at the
MicroTech III keypad.
Figure 20: High Pressure Switch
Refrigerant Screen
During manufacturing, service, and repair there is always the
potential for debris to accidentally enter the sealed refrigeration
system. Filter screens are positioned around the refrigerant
circuit to prevent any possible debris from entering critical
components; expansion valves, compressors, etc. These
screens are not bi-direction and must be installed in a specific
direction if replaced. Please be aware that these screens are
not desiccant filters and provide no moisture protection for
compromised systems.
Figure 21: Refrigerant Screen
Four-Way Valve
The Four-Way Valve (4WV) also known as a Reversing Valve
is a component only used on Heat Pumps. This device is
used to direct the discharge gas from the compressor into the
outdoor coil (Heating Mode) or indoor coil (Cooing Mode). This
device is defaulted to cooling and when un-energized will direct
the discharge gas into the outdoor coil.
Figure 22: Four-Way Valve
High Pressure Switch
(HP1)
Refrigerant Screen
Compressor Discharge Gas
Suction Vapor
to Compressor
Cooling Mode:
Suction Vapor from
Indoor Coil
Heating Mode:
Discharge Gas to
Indoor Coil
Cooling Mode:
Discharge Gas to
Outdoor Coil
Heating Mode:
Suction Vapor from
Outdoor Coil
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www.DaikinApplied.com
23
IM 1125-7 • REBEL ROOFTOPS
Summary of Contents for Rebel DPS003A
Page 109: ...IM 1125 7 109 Addendum follows...
