Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 567

PIPER CHEROKEE WARRIOR SERVICE MANUAL
8. Operate engine at 1000 rpm to 1500 rpm. The low and high side gauges on the control panel
shall indicate as follows:
GAUGE
Low Side (Pressure)
High Side (Pressure)
High Side (Pressure)
9. When charge is properly established:
A. Stop engine.
B. Close low side valve on control panel.
10. Disconnect charging stand hoses from service valves.
11. Install protective caps on service valve.
12. Install rear close out panel.
b. Using A Hand Manifold Set.
1. Check the the blue hose on manifold set is connected to the airplane's low side service port.
2. Check that the red hose on manifold set is connected the airplane's high side service port.
3. Check that the yellow hose on manifold set is connected to a tank of R12 refrigerant.
4. Ensure that both the low and high side (pressure) valves are closed.
5. Start engine.
A Operate at 1000 rpm for two minutes. Check sight gauge for bubbles.
B Operate at 2000 rpm for two minutes. Check sight gauge for bubbles.
6. Any bubbles passing through sight gauge indicates that additional refrigerant is required.
United States environmental regulations prohibit adding
refrigerant to any air conditioning system with leaks.
Normally, a tight system will not loose refrigerant.
7. Open refrigerant tank valve.
8. Add refrigerant slowly through the low side valve until sight gauge remains bubble free.
9. Operate engine at 1000 rpm to 1500 rpm. The low and high side gauges on the manifold set
shall indicate as follows:
GAUGE
Low Side (Pressure)
High Side (Pressure)
High Side (Pressure)
Added: February 28, 1995
AMBIENT
TEMPERATURE
All
Up thru 75° F
Over 75° F
NOTE
AMBIENT
TEMPERATURE
All
Up thru 75° F
Over 75° F
3B8
Island Enterprises
GAUGE
INDICATION
10 to 35 psig
125 psig minimum to 175
maximum psig
150 psig minimum to 300
maximum psig
GAUGE
INDICATION
10 to 35 psig
125 psig minimum to 175
maximum psig
150 psig minimum to 300
maximum psig
ACCESSORIES AND UTILITIES