43
SERVICING
Do not front seat the service valve(s) with the
compressor open, with the suction line of the
compressor closed or severely restricted.
1. Connect the vacuum pump, vacuum tight manifold set with
high vacuum hoses, thermocouple vacuum gauge and charg-
ing cylinder as shown.
2. Start the vacuum pump and open the shut off valve to the high
vacuum gauge manifold only. After the compound gauge (low
side) has dropped to approximately 29 inches of vacuum,
open the valve to the vacuum thermocouple gauge. See that
the vacuum pump will blank-off to a maximum of 25 microns.
A high vacuum pump can only produce a good vacuum if its
oil is non-contaminated.
LOW SIDE
GAUGE
AND VALVE
HIGH SIDE
GAUGE
AND VALVE
EVACUATION
3. If the vacuum pump is working properly, close the valve to the
vacuum thermocouple gauge and open the high and low side
valves to the high vacuum manifold set. With the valve on the
charging cylinder closed, open the manifold valve to the cyl-
inder.
4. Evacuate the system to at least 29 inches gauge before open-
ing valve to thermocouple vacuum gauge.
5. Continue to evacuate to a maximum of 250 microns. Close
valve to vacuum pump and watch rate of rise. If vacuum does
not rise above 1000 microns in three to five minutes, system
can be considered properly evacuated.
6. If thermocouple vacuum gauge continues to rise and levels off
at about 5000 microns, moisture and non-condensables are
still present. If gauge continues to rise a leak is present.
Repair and re-evacuate.
7. Close valve to thermocouple vacuum gauge and vacuum pump.
Shut off pump and prepare to charge.
S-103
CHARGING
WARNING
REFRIGERANT UNDER PRESSURE!
* Do not overcharge system with refrigerant.
* Do not operate unit in a vacuum or at negative
pressure.
Failure to follow proper procedures may cause
property damage, personal injury or death.
CAUTION
Use refrigerant certified to AHRI standards.
Damage to the compressor caused by the use
of used refrigerant is not covered by the warranty.
Most portable machines cannot clean used
refrigerant to meet AHRI standards.
CAUTION
Damage to the unit caused by operating the compressor
with the suction valve closed is not covered under the
warranty and may cause serious compressor damage.
Charge the system with the correct amount of refrigerant. See the
Installation Manual for the correct refrigerant charge.
An inaccurately charged system will cause future problems.
1. While system is under a vacuum, connect charging cylinder
and allow liquid refrigerant only to enter the high side.
2. Once the system stops taking refrigerant, close the valve on
the high side of the charging manifold.
3. Start the system and charge the remaining balance of the re-
frigerant through the low side.
NOTE:
R410A should be drawn out of the storage container or
drum in liquid form due to its fractionation properties, but should
be "Flashed" to its gas state before entering the system. There are
commercially available restriction devices that fit into the sys-
tem charging hose set to accomplish this.
DO NOT
charge liquid
R410A into the compressor.
4. With the system still running, close the valve on the charging
cylinder. Some liquid refrigerant will remain in the charging
cylinder hose and liquid hose. Reseat the liquid line core.
Slowly open the high side manifold valve and transfer the
liquid refrigerant from the liquid line hose and charging cyl-
inder hose into the suction service valve port. CAREFUL: Watch
so that liquid refrigerant does not enter the compressor.
FINAL CHARGE ADJUSTMENT
The outdoor temperature must be 65
°
F to 105
°
F. If outdoor ambi-
ent temperature is out of range, charge defined amount and don't
adjust subcooling. Set the room thermostat to CHARGE MODE.
After system has stabilized per startup instructions, check
subcooling as detailed in the following section.
