Operating instructions

39

Complete charging machine
Perform leak test
Add refrigernt until pressure is
241 kPa for HFC-134a.

1 - Attach compound gauge -101-0-3000 kPa to each vessel
2 - Note ambient temperature gauge readings
Machines with refrigerant charge
Machines with nitrogen holding charge
 Pressure on condenser vessel is
at refrigerant saturated conditions
 Cooler pressure reading is 103
kPa or higher.
 Pressure on condenser vessel is
less than saturated refrigerant
pressure.
 Cooler pressure reading is below
103 kPa
 Leak suspected
Record pressures Record pressures
Power up controls to ensure oil
heater is on and oil is hot. Equalizer
pressure between cooler and
condenser
Is either vessel at 0 kPa?
Power up controls to ensure oil
heater is on and oil is hot. Equalizer
pressure between cooler and
condenser
Add refrigerant until pressure is
above 241 kPa
for HFC-134a.
Perform leak test
Perform leak test
Leaks found
No leaks found
Locate and mark all leak sources
Recover refrigerant from
vessel
Perform standing vacuum
test
Recover refrigerant from vessel
Repair all leaks
Dehydrate vessel if vessel was at atmospheric
pressure or lower.
Pass Fail
 Pressure reading is less than 103
kPa but greater than 0 kPa
 Leak suspected.
Pressure is at 103 kPa (factory
charge)
Raise pressure to 483 kPa with
nitrogen (if using electronic detector,
add tracer gas now)
Add refrigerant until pressure is
above 241 kPa (if using electronic
detector, add tracer gas now)
Perform leak test using soap bubble
solution, ultrasonics or electronic
detector
Leaks found No leaks found
Evacuate
vessel
Locate and
mark all leak
sources
 Release the pressure in the
vessel
 Repair all leaks
 Retest only those joints
that were repaired
Release nitrogen and evacuate
holding charge from vessels
Leaks found No leaks found
No leaks found Leaks found