Carrier 69NT40-541-001, Операция и обслуживание

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7–1 T-316
SECTION 7
SERVICE
NOTE
To avoid damage to the earth's ozone layer, use a refrigerant recovery system whenever removing
refrigerant. When working with refrigerants you must comply with all local government environmental
laws. In the U.S.A., refer to EPA section 608.
WARNING
!
Never use air for leak testing. It has been determined that pressurized, mixtures of refrigerant
and air can undergo combustion when exposed to an ignition source.
7.1 SECTION LAYOUT
Service procedures are provided herein beginning with refrigeration system service, then refrigeration system com-
ponent service, electrical system service, temperature recorder service and general service. Refer to the
Table of
Contents to locate specific topics.
7.2 SERVICE VALVES
The compressor suction, compressor discharge and liquid line service valves (see Figure 7.1 ) are provided with a
double seat and a gauge connection which enable servicing of the compressor and refrigerant lines. Turning the
valve stem clockwise (all the way forward) will frontseat the valve to close off the suction, discharge or liquid line
and open the gauge port to the compressor or low side. Turning the stem counterclockwise (all the way out) will
backseat the valve to open the connections and close off the port
With the valve stem midway between frontseat and backseat, the lines are open to both the connections and the
gauge connection.
For example, the valve stem is first fully backseated when connecting a manifold gauge to measure pressure.
Then, the valve is opened 1/4 to 1/2 turn to measure the pressure.
Figure 7.1 Service Valve
1. Suction, Discharge or Liquid Line Connection
2. Service Port
3. Stem Cap 4. Valve Stem
5. Compressor or Filter Drier Inlet Connection
- - - - -
VALVE
FRONTSEATED
(Clockwise)
VALVE
BACKSEATED
(Counterclockwise)
1
2
3
4
5