83 PB
R-32 SEALED SYSTEM REPAIRS
Refrigerant Charging
NOTE: Always weigh in refrigerant based on the model nameplate.
Warning:
• Ensure that contamination of different refrigerants does not occur when using charging equipment.
• Hoses or lines shall be as short as possible to minimise the amount of refrigerant contained in them.
• Charge unit with refrigerant cylinder in the inverted position to obtain liquid refrigerant.
• Charge the unit according to the amount on the name plate matching the unit.
• Extreme care shall be taken not to overfill the REFRIGERATING SYSTEM.
• Prior to recharging a system, it shall be pressure-tested with the dry nitrogen.
NOTE: Because the refrigerant system is a sealed system, service process tubes will have to be installed. First install a line tap and recover
refrigerant from system. Refer to the Refrigerant removal section of this manual for procedures.
The acceptable method for charging the sealed system is the Weighed in Charge Method. The weighed in charge method is applicable to all units. It is
the preferred method to use, as it is the most accurate.
The weighed in method should always be used whenever a charge is removed from a unit such as for a leak repair, compressor replacement, or when
there is no refrigerant charge left in the unit. To charge by this method, requires the following steps:
• Warning: Ensure sufficient ventilation at the repair place.
Warning: Ensure there are no open flame sources or hot surfaces that exceed 1200˚F in the work area.
1. Recover Refrigerant in accordance with EPA regulations. (Refer to Refrigerant Removal, Recovery, and Evacuation Section).
NOTE: If a low charge is suspected weigh recovered refrigerant and compare to unit nameplate.
NOTE: Access valves must be removed after charging is complete to return this unit to a sealed system.
2. Weigh in the refrigerant charge with the proper quantity of R-32 refrigerant per model nameplate.
3. Crimp the process tube and solder the end shut.
4. Start unit, and verify performance.
NOTE: EPA Section 608 regulations require that if a system is charged with flammable refrigerant it must have red markings on the access ports
(Process tube).
WARNING: Electrical Shock Hazard
Disconnect all power to the unit before starting maintenance. All electrical connections and wiring MUST be installed by a qualified electrician
and conform to all codes which have jurisdiction. Failure to do so can result in property damage, severe electrical shock or death.
WARNING: This Product uses R-32 Refrigerant
Do not use means to accelerate the defrosting process or to clean, other than those recommended by the
manufacturer.
When not installed, the appliance shall be stored in a room without continuously operating ignition
sources (for example: open flames, an operating gas appliance or an operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.
WARNING:
Refrigeration System under High pressure
Do not puncture, heat, expose to flame or incinerate. Only certified refrigeration technicians should service this equipment. R32 systems
operate at higher pressures than R22 equipment. Appropriate safe service and handling practices must be used.
WARNING:
Freeze Hazard
Proper safety procedures must be followed, and all PPE must be utilized when working with liquid refrigerant. Failure to
comply could result in minor to moderate injury.
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