5-3 62-12023
Figure 5.1 Manifold Gauge Set (R-404A)
1. Manifold Gauge Set
2. Hose Fitting (0.5-16 Acme)
3. Refrigeration and/or Evacuation Hose (SAE
J2196/R-134a)
4. Hose Fitting w/O-ring (M14 x 1.5)
5. High Side Field Service Coupler
6. Low Side Field Service Coupler
- - - - -
5.2.1 Preparing Manifold Gauge/Hose Set for Use
If the manifold gauge/hose set is new or was exposed to the atmosphere, it must be evacuated to remove contam-
inants and air as follows:
1. Connect high and low side hoses to blank connections on back of manifold gauge set and midseat both
hand valves.
2. Connect the yellow hose to a vacuum pump and an R-404A cylinder.
3. Evacuate to 10 inHg (254 mmHg) and charge with R-404A to a slightly positive pressure of 1.0 psig (0.07
Bar).
4. Frontseat both manifold gauge set hand valves, and disconnect from cylinder. The gauge set is now ready
for use.
5.2.2 Connecting Manifold Gauge/Hose Set
To connect the manifold gauge/hose set for reading pressures, do the following:
1. Remove service valve stem cap and check that it is backseated. Remove access valve cap.
2. Connect the refrigeration hose (see Figure 5.1) to the access valve.
3. Read system pressures.
4. Repeat the procedure to connect the other side of the gauge set.
5.2.3 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 low side pressure. This returns any liquid that may be in the high side hose to the system.
Opened (Backseated)
Hand Valve
Closed (Frontseated)
Hand Valve
To Low Side
Access Valve
To High Side
Access Valve
(Red Knob)
(Blue Knob)
YELLOW
RED
BLUE
Low Pressure Gauge High Pressure Gauge
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