Carrier 69NT40-541-001, Operation And Service

Page: 91 / 156

7–3 T-316
Figure 7.3 R-134a Manifold Gauge/Hose Set
1. Manifold Gauge Set
2. Hose Fitting (0.5-16 Acme)
3. Refrigeration and/or Evacuation Hose (SAE
J2196/R-134a)
4. Hose Fitting with O-ring (M14 x 1.5)
5. High Side Field Service Coupling
6. Low Side Field Service Coupling
- - - - -
b. Connecting Manifold Gauge/Hose Set
Connection of the manifold gauge/hose set (see Figure 7.4 ) is dependent on the component being serviced. If only
the compressor is being serviced, the high side coupling is connected to the discharge service valve. For service of
the low side (after pump down), the high side coupling is connected to the liquid line service valve. The center hose
connection is brought to the tool being used. To connect the manifold gauge/hose set, do the following.
1. Remove service valve stem caps and check to make sure they are backseated. Remove service port caps.
(See Figure 7.1 )
2. Connect the high side field service coupling (see Figure 7.3 ) to the discharge or liquid line valve service
valve port.
3. Turn the high side field service coupling knob (red) clockwise, which will open the high side of the system to
the gauge set.
4. Connect the low side field service coupling to the suction service valve port.
5. Turn the low side field service coupling knob (blue) clockwise, which will open the low side of the system to
the gauge set.
6. To read system pressures: slightly midseat the high side and suction service valves.
To Low Side
Service Port
To High Side
Service Port
- Red
- Yellow
Blue
Red Knob Blue Knob
1
2
3
3
3
4
4
5
6