Refrigeration Maintenance
135
The discharge pressure regulator valve is not
repairable and must be replaced as an assembly.
Refrigeration System Checks
NOTE: The Scroll compressor can not be
pumped down. Check the compressor efficiency
using the following procedure.
1. Install a gauge manifold set. Attach the
compound (low pressure) gauge to the service
port on the suction service valve. Attach the
high pressure gauge to the discharge service
port. A low loss fitting must be used on the
hose connected to the discharge service port.
2. Run the unit with all zones in high speed cool
until the system pressures stabilize.
3. Note the head pressure on the high pressure
gauge.
4. Cover the condenser and check the head
pressure. The compressor should be able to
increase the head pressure at least 100 psig
(689 kPa). The compressor is probably faulty
if it cannot raise the head pressure 100 psig
(689 kPa).
Check the rest of the system by checking the
system pressures and the refrigerant flow in heat
and cool. The suction and discharge pressures
should be within the normal ranges for a standard
unit. Check the temperatures of the refrigeration
lines by hand to check the refrigerant flow.
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