Carrier 69NT40-541-001, Operation And Service

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T-316 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.
c. 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:
BLUE
D S
YELLOW
RED
1
2
3
4
5
6
10
11
12
13
7
8
9