8–5
62-11785
8.5
REFRIGERANT SYSTEM SERVICE
Service of refrigerant system equipment, refrigerant charge, leak checking and evacuation.
Figure 8.4 Refrigerant System Service
1.
Vacuum Pump
2.
Vacuum Indicator
3.
Refrigerant Cylinder
4.
Refrigerant Recovery Unit
5.
Valve
6.
Manifold Gauge Set
7.
Economizer Connection
8.
Suction Service Valve
9.
Liquid Injection Valve
10. Economizer Expansion Valve
11. Economizer
12. Evaporator
13. Evaporator Expansion Valve
14. Compressor Suction Modulation Valve (CSMV)
15. Subcooler
16. Condenser
17. Receiver
18. Liquid Line Service Valve
19. Discharge Service Valve
20. Compressor
8.5.1
Refrigerant System Service Connections
To service the refrigerant system, service equipment is connected at the compressor discharge service valve,
compressor suction service valve, and/or the liquid line service valve.
When connecting to a valve, backseat the valve (turn counterclockwise) to close off gauge connection and attach
service line to the valve. Open valve 1/4 to 1/2 turn (clockwise) and purge the service line. See
for an
example of a full service connection setup.
NOTE
To avoid damage to the earth’s ozone layer, use a refrigerant recovery system whenever removing
refrigerant from a refrigeration system. When working with refrigerants you must comply with all local
government environmental laws, U.S.A. EPA section 608.
8.5.2
Servicing The Refrigerant Charge
Servicing of the refrigerant charge includes: checking charge level, checking for noncondensibles, removing the
charge, pumping down the low side, pumping down the compressor, adjusting the charge level and adding a
complete charge. Procedures for charge service are provided in the following sub paragraphs.
a. Checking Charge Level
Check refrigerant charge before adding any refrigerant to the system. Only add refrigerant if charge is low. If charge is
low, leak checking must be performed (refer to
) and all leaks repaired before adding refrigerant.
1. Install a manifold gauge set to allow reading of discharge pressure. See
.
2. Start unit in Continuous Operation. Adjust setpoint so that unit is and operating in economized mode. Use
Technician Mode to verify that the ECXV is open.
3. Run approximately ten minutes - until the refrigeration system is warmed up and the refrigerated compartment
temperature is approaching setpoint.
4. Partially block off air flow to condenser coil so discharge pressure rises to 230 psig (15.7 bar).
5. Check the receiver sight glasses to determine charge. The system is correctly charged when the lower sight
glass is not empty and the upper sight glass is not full.
6. If the system appears to be overcharged or under charged, adjust charge. Refer to following step f.
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