Discharging (Bleeding Or Purging) System - Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual

PIPER CHEROKEE WARRIOR SERVICE MANUAL
5. Locate leak(s) using an electronic leak detector designed to detect R12. Or, use soap and
water in a thick solution.
6. Repair leak(s)
7. Check that the both high side and low side valves on the manifold hand set are closed.
8. Close service valve on refrigerant container. Disconnect yellow manifold hand set center hose
from refrigerant container.
9. On systems equipped with quick disconnect connections, close coupler valves. Disconnect
manifold hand set red and blue hoses from airplane service ports. Remove manifold hand set.
10. Recover remaining refrigerant from system using the Robinair 34700 (or other approved)
charging station. (Refer to paragraph 14-12.) Any quantity of oil recovered from aircraft must be measured
and a equal amount of new oil (mineral oil) must be added to system before recharging.
11. Disconnect charging/test station from service ports.
12. Perform evacuation procedure per paragraph 14-10, a.
13. Immediately charge system per paragraph 14-13.
14-12. DISCHARGING (BLEEDING OR PURGING) SYSTEM. (Refer to Figure 14-6.)
This procedure is required when it is necessary to remove all refrigerant from air conditioning system.
The following instructions pertain to the Robinair 34700 charging/recovery station. Refer to manufac-
turers instructions when using a different make station.
Because United States environmental regulations prohibit the
release of refrigerant into the atmosphere, an appropriately
certified charging/recovery station MUST BE USED to discharge
any air conditioning system.
See Operator's Manual for detailed instructions for discharging
system.
a. Gain access to service valves by removing rear access panel.
b. Remove protective caps from access valves.
c. Connect high side (red) hose to air conditioner high side service valve. On systems equipped with
quick disconnect connections, open coupler valve.
d. Connect low side (blue) hose to air conditioner low side service valve. On systems equipped with
quick disconnect connections, open coupler valve.
e. Check the low side gauge (GAUGE 1) and high side gauge (GAUGE 2) to determine that there is
pressure in the system. If there is no pressure, there is no refrigerant in the system to recover.
f. Check that the oil drain valve is closed.
g. Open both the low side and high side valves on control panel.
h. Open the red GAS (vapor) and the blue LIQUID valves on the charging station's refrigerant tank.
i. SLOWLY open the oil drain valve to see if system oil separator contains oil. If it does, let oil
drain into the oil drain bottle (located at the bottom of the rear side of the charging station) until separator is
empty.
j . Close the oil drain valve. Dispose of collected oil in an environmentally (EPA) acceptable manner.
Return collection bottle to its place on the charging stand.
k. Plug unit into a proper voltage outlet. Turn MAIN POWER switch ON.
Added: February 28, 1995
NOTE
NOTE
3B5
Island Enterprises
ACCESSORIES AND UTILITIES