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WARNING
This procedure must be performed by
a certified air conditioning technician
who has experience with hermetic
systems and Refrigerant R-134A.
CAUTION
Vapor charge CCU only.
NOTICE
Refrigerant Recovery:
Venting of refrigerant is against
the law and subject to fines and
loss of certification.
EPA regulations require that all
CFC and HCFC refrigerants be
recovered before any system can
be opened for service.
Recovery of refrigerant is done
using a certified recovery unit.
• Before a refrigeration system
can be opened to make repairs.
• Before pressurizing the system
with nitrogen for leak testing.
• Before disposing of any system or
component containing refrigerants.
• When it is necessary to remove
excess charge from an
overcharged system.
BLUE
NOTICE
Total System Capacity is 64–68 oz.
A scale must be used to measure the
refrigerant weight. No other method
is acceptable. Failure to follow this
procedure exactly will result in
improper air conditioning function.
62-11175 COMFORTPRO SERVICE MANUAL
2.0
CLIMATE CONTROL UNIT (CCU)
2.1
PREPARATION
2.1.1 Charging the CCU
1
Pressure test the system for leaks with nitrogen.
2
Vacuum all the nitrogen for a minimum of 30 minutes to 500 microns.
3
With the high and the low side valves open, charge the system with
R-134A vapor to break the vacuum. Once the scale stabilizes and the
high and the low side pressures match, close the high side valve.
4
With only the low side valve open, start the A/C compressor by
selecting High A/C (APU Running). If needed lower the temperature
set point to start the A/C compressor.
5
Continue charging the system with vapor, on the low side only, until a
total of 64–68 oz of R-134A refrigerant has
been added as measured by the scale.
The air conditioning system has a 5
minute delay timer (minimum time
between cycles is 5 minutes).
RED
Figure 2- 1: Connecting hoses to CCU to Condenser
NOTICE
LOW
HIGH
SCALE 64–68 OZ
CONDENSER
CCU
2-1
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