Figure 6-4. Vacuum Pump Connections - Carrier 69NT40--541--200 TO 299 Operation And Service

CAUTION
Make sure supply air temperature does not
go below the original set point for more
than five minutes, or damage to the load
may occur.
d. Refer to the pressure temperature curves in
Figure 6-31.
e. If the discharge/suction pressures are within the
2
9
7
8
11
4
3
1

Figure 6-4. Vacuum Pump Connections

normal operating system pressures, then the
charge should be correct.
f. If the discharge pressure is more than ten psig
below the curve, add three pounds of R-134a
refrigerant through the suction line process tube.
g. Return set point to previous temperature setting.
h. The unit should be operating normally. Return to
water-cooled operation, if necessary.
i. Leave piercing valves in place for Port repair.
j. Tag the unit for Port/Maintenance repair.
4
6
4
6-5
1. Refrigerant
Recovery Unit
2. Refrigerant Cylinder
3. Evacuation Manifold
(R-134a)
4. Hand Valve
5. Vacuum Pump
6. Electronic Vacuum
Gauge
7. Condenser Coil
8. Compressor
9. Evaporator Coil
10. Liquid Line Process
Tube
11. Suction Line
Process Tube
10
5
T--317