Scholar V VAIVA Maintenance & Service Manual 10/2017 Rev.2
10
FILTER/DRIER
SIGHT GLASS
HIGH PRESSURE SWITCH
COMPENSATOR TANK
LOSS OF CHARGE
SWITCH
OUTDOOR COIL SENSOR (DEFROST)
OUTDOOR
ORIFICES
VENTILATION
DUCT
Figure 5. Scholar V Component Locations
D.
Indoor/Outdoor Coils.
The coils are constructed of lanced, aluminum fins
mechanically bonded to rifled, seamless copper tubes.
E.
Filter Drier
- The filter drier performs two functions in the refrigerant circuit. First,
it removes foreign particulate matter, e.g. dirt, scale, solder particles from the
refrigerant to protect the compressor and other components in the refrigerant system
with small openings or close tolerances. Second, it helps to absorb any moisture in
the refrigerant with a desiccant.
F.
High and Low Refrigerant Pressure (Air Conditioner) or Loss of Charge (Heat
Pump) Switches & Optional (Heat Pump Only) Indoor Coil Freeze Stat.
These
switches render the compressor and outdoor fan motor inoperative whenever the
limits of the high or low pressure switches are exceeded or indoor coil freeze up.
In the event of high pressure, the Scholar V unit will turn off and lockout. The high
pressure switch opens at 650 psig and resets at 420 psig.
The system has a High Pressure Switch (HPS) that indicates a high system pressure.
When this occurs, the system will immediately set a High Pressure Lockout. This
lockout condition shuts the system off and displays a fault on the HMI.
The Low Pressure (air conditioner) or Loss of Charge (heat pump) switches are
designed is designed to guard against the operation of the system in the event of
a total loss of refrigerant. If the Pressure (air conditioner) or Loss of Charge (heat
pump) switch opens for more than eight minutes, the system will turn off and a Low
Pressure Lockout fault will be indicated on a fault message on the HMI.