Operating instructions

TM 11574A-OI
3-8
(b) Connecting Manifold Gauge/Hose Set Connection of the manifold gauge/hose set (Figure
3-5) 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 back seated.
Remove service port caps (Figure 3-2).
2
Connect the high side field service coupling (Figure 3-4) 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 mid seat the high side and suction service valves.
1. Discharge Service Valve
2. Compressor
3. Suction Service Valve
4. Receiver
5. Liquid Service Valve
6. Vacuum Pump
7. Low Side Hose
8. Center Hose
9. High Side Hose
10. Manifold Gauge Set
11. Refrigerant Cylinder
12. Recovery Machine
Figure 3-4. Refrigeration System Service Connections.