Check Valve
All DPS 003–015 will have check valves on each of the
compressor discharge lines. On medium cabinet units
(7–15 Tons), two valves, one on each compressor, prevent
recirculation of refrigerant during part load conditions. On
small cabinet units (3–6 Tons) a single check valve prevents
migration of refrigerant into the scrolls during off cycles.
Figure 26: Discharge Line Check Valves on Large Cabinet
(7.5T) Heat Pump (DPH)
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 27: 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 28: Refrigerant Screen
Y-Joint connecting
Y-Joint connecting
COMP1 and COMP2
COMP1 and COMP2
Discharge
Discharge
Direction of
Direction of
Compressor
Compressor
Discharge Gas
Discharge Gas
CAUTION!
CAUTION!
Correct Orientation
Correct Orientation
Must Be Observed
Must Be Observed
High Pressure Switch
High Pressure Switch
(HP1)
(HP1)
Refrigerant Screen
Refrigerant Screen
Refrigeration System
www.DaikinApplied.com
27
IM 1125-13 • REBEL ROOFTOPS