Operating instructions

TM 11574A-OI
3-7
(a) Preparing Manifold Gauge/Hose Set For Use If the manifold gauge/hose set is new or
was exposed to the atmosphere, it will need to be evacuated to remove contaminants
and air as follows:
1
Back seat (turn counterclockwise) both field service couplings (Figure 3-4) and mid
seat both hand valves.
2
Connect the yellow hose to a vacuum pump and refrigerant 134a cylinder.
3
Evacuate to 10 inches of vacuum and then charge with R-134a to a slightly positive
pressure of 1.0 psig @ (0.1 kg/cm).
4
Front seat both manifold gauge set valves and disconnect from cylinder. The gauge
set is now ready for use.
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 Coupling
6. Low Side Field Service Coupling
Figure 3-3. Manifold Gauge/Hose Set.