T-354
7–4
Figure 7.4 Refrigeration System Service Connections
1. Discharge Service Valve
2. Compressor
3. Suction Service Valve
4. Receiver or Water Cooled Condenser
5. Liquid Service Valve
6. Vacuum Pump
7. Low Side Hose
8. Center Hose
9. High Side Hose
10. Electronic Vacuum Gauge
11. Manifold Gauge Set
12. Refrigerant Cylinder
13. Reclaimer
- - - - -
CAUTION
!
To prevent trapping liquid refrigerant in the manifold gauge set, be sure set is brought to suc-
tion pressure before disconnecting.
Removing the Manifold Gauge Set
1. While the compressor is still ON, backseat the high side service valve.
2. Midseat both hand valves on the manifold gauge set and allow the pressure in the manifold gauge set to be
drawn down to suction pressure. This returns any liquid that may be in the high side hose to the system.
3. Backseat the suction service valve. Backseat both field service couplings and frontseat both manifold set
valves. Remove the couplings from the service ports.
4. Install both service valve stem caps and service port caps (finger-tight only).
7.4
PUMPING THE UNIT DOWN
To service the filter-drier, moisture-liquid indicator, expansion valve, suction modulation valve, quench valve, or
evaporator coil, pump the refrigerant into the high side as follows:
1. Attach manifold gauge set to compressor service valves (refer to
).
2. Start the unit and run in a cooling mode for 10 to 15 minutes. Frontseat the liquid line service valve. Place
Start-stop switch in the OFF position when the suction reaches a positive pressure of 0.1kg/cm
(1.0psig).
3. Frontseat the suction service valve. The refrigerant will be trapped between the compressor suction service
valve and the liquid line valve.
4. Before opening up any part of the system, a slight positive pressure should be indicated on the pressure
gauge. If a vacuum is indicated, emit refrigerant by cracking the liquid line valve momentarily to build up a
slight positive pressure.
D
S
- YELLOW
- RED
Содержание 69NT40-541-306
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