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T-319
6–4
Figure 6.4 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).
6.4
PUMPING DOWN THE UNIT
To service the filter-drier, liquid line solenoid valves, expansion valves, suction modulation valves, quench valve, or
evaporator coils, 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 both compartments in perishable cooling mode for 10 to 15 minutes. Set both the Host
and Remote evaporator set points to temperatures lower than the ambient/box temperature while the con-
tainer door and remote compartment partition are open.
D
S
9-RED
Summary of Contents for 69NT40-541-304
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Page 61: ...7 3 T 319 Figure 7 2 Schematic 69NT40 541 304...
Page 62: ...T 319 7 4 Figure 7 3 Unit Wiring Diagram Sheet 1 69NT40 541 304...
Page 63: ...7 5 T 319 Figure 7 4 Unit Wiring Diagram Sheet 2 69NT40 541 304...
Page 64: ...T 319 7 6 Figure 7 5 Legend 69NT40 541 345...
Page 65: ...7 7 T 319 Figure 7 6 Schematic 69NT40 541 345...
Page 66: ...T 319 7 8 Figure 7 7 Unit Wiring Diagram Sheet 1 69NT40 541 345...
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Page 78: ...T 319 13 1 13 RECEIVER 8 5 17 18 19 20 4 Item 1 4 2 3 6 7 8 6 7 10 9 11 12 13 14 15 16 2...
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Page 84: ...T 319 17 1 17 REMOTE EVAPORATOR FRAME A A A A 4 2 5 6 3 8 9 1 15 11 7 12 10 14 13 2 2 2 9 3 9...
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