Thermo King Super II SR+, Руководство пользователя

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Refrigeration Maintenance (Rev 6/98)
75
CHECKING COMPRESSOR OIL
The compressor oil should be checked when there is evi-
dence of oil loss (oil leaks) or when components in the
refrigeration system have been removed for service or
replacement.
Checking Compressor Oil
To check compressor oil level with an ambient air
temperature above 10° C (50° F):
Install a gauge manifold on the compressor.
Operate the unit on Cool with a 138 kPa (20 psi) minimum
suction pressure and a 1275 kPa (185 psi) minimum dis-
charge pressure for 15 minutes or more.
After the unit has maintained the above conditions for 15
minutes, observe the oil level. The oil should be 1/4 to 1/2
up in the sight glass.
1. Sight Glass
1
To check compressor oil level with an ambient air
temperature below 10° C (50° F):
Run the unit through a complete defrost cycle. After com-
pleting the defrost cycle, run the unit on Cool for ten min-
utes. Observe the oil level. The oil should be 1/4 to 1/2 up in
the sight glass.
If the box is empty, you can run the unit on the heat cycle
instead of the defrost cycle.
NOTE: Use refrigeration compressor oil ONLY. Polyol
Ester type P/N 203-413 is required for R-402B, R-404A,
and R-134a.
HIGH PRESSURE CUTOUT SWITCH
(HPCO)
The HPCO is located on the compressor discharge mani-
fold. If the discharge pressure rises above 3103 kPa
(450 psi) [2068 kPa (300 psi) for R-12 and R-134a sys-
tems], the HPCO opens the 8D circuit to shutdown the unit.
To test the HPCO, rework a gauge manifold following the
High Pressure Cutout Manifold illustration.
1. Connect the gauge manifold to the compressor dis-
charge service valve with a heavy duty, black jacketed
thick wall #HCA 144 hose with a 6204 kPa (900 psi)
working pressure rating.
2. Run the unit in high speed cool.