ENVIRONMENTAL CONTROL UNIT (ECU).
This task covers:
a. Manifold Gage Set Installation
e. Checking for Leaks
b. Recovering Refrigerant
f. Charging System
g. Pump Down System
d. Evacuating System
h. Manifold Gage Set Removal
Shop Equipment, Automotive Maintenance and
Power shut off, power panel and rear control panel
Tool Kit, Service: R22 Refrigeration Unit
ECU work platform installed (reference
ECU covers and doors opened or removed as
R22 Refrigerant Recovery and Recycle Unit
Refrigerant Gas Leak Detector (Item 3,
The R22 refrigerant system is pressurized. To prevent injury to personnel, gloves and eye
protection must be worn when working on R22 refrigerant system.
Prevent contact of R22 refrigerant with flame or hot surface. Heat causes R22 refrigerant to
break down and form carbonyl chloride (phosgene), a highly toxic and corrosive gas.
R22 refrigerant must be recovered. Venting R22 refrigerant into the atmosphere is a
violation of public law and subject to severe penalties.
Do not attempt to remove or connect refrigerant servicing equipment while ECV is running.
Failure to observe these warnings can result in injury to personnel.
This procedure for servicing the refrigeration system uses two manifold gage sets. Servicing
may be accomplished using only one manifold gage set, but the time to accomplish the task
will be longer.
Whenever any refrigerant component is replaced, the system must be recovered, evacuated
a. Manifold Gage Set Installation (Refer to Figure 3-6)
Hang manifold gage sets (1) at convenient location on passenger side of ECU next to service
ports (2) and turn both the high pressure gage valves (3) and the low pressure gage valves (4)
on gage sets (1) clockwise to their closed (front seated) position.