Thermo King 914 724, Руководство пользователя

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Refrigeration Maintenance (Rev. 1/99)
47
CHECKING COMPRESSOR OIL CHARGE
The compressors are furnished with the amount of oil
shown in the Specifications chapter. The oil level in the
compressor will change after the compressor is initially run,
making any level measurements inaccurate.
To ensure an adequate oil supply, the following procedure
must be followed whenever the refrigerant charge is lost or
removed from a unit:
1. Install a compressor on the system having a residual oil
supply and self-lubricating system such as a TK 214
model. Connect an oil separator on the discharge or
suction line to collect and drain out circulated oil.
NOTE: A suction line oil separator can be improvised
by installing a suction filter upside down in the suc-
tion line near the compressor. Cap off both access
ports, and use the lower one to drain off the accumu-
lated oil.
2. Place a normal amount of oil in the cleanup compressor
before operating.
3. Charge with 6 to 7 lb (2.7 to 3.2 kg) of refrigerant.
4. Operate at a low speed (600 to 800 rpm) for 2 hours, or
until the compressor oil level reaches a minimum
allowable level, whichever occurs first. Drain the col-
lected oil from the oil separator as it fills, taking care to
not allow any collected oil to recirculate.
5. Prepare the original compressor that was removed from
the unit (or a replacement) by draining out any existing
oil and replacing the oil with the amount of oil shown
in the Specifications. (Service Parts compressors may
already be properly filled.)
6. Install the original compressor (or its replacement), and
proceed with the manual evacuation and refrigerant
charging procedure.
HIGH PRESSURE CUTOUT SWITCH
(HPCO)
The HPCO is located on the hot gas line (Model 10) or on
the check valve assembly (Model 20) inside the condenser
unit. If the discharge pressure rises above 300 psi
(2068 kPa) on R-134a units, or above 450 psi (3103 kPa) on
R-404A units, the HPCO opens the 7A circuit and de-ener-
gizes the compressor motor contactor or the compressor
clutch. To test the HPCO, rework a gauge manifold per the
High Pressure Cutout Manifold illustration.
1. Connect the gauge manifold to the compressor dis-
charge service valve.
1. Relief Valve (66-2202)
2. O-ring (33-1015)
3. Adapter Tee Weather Head
(No. 552X3)
High Pressure Cutout Manifold