REFRIGERANT PIPING CONNECTIONS
Piping connections:
Outdoor units should be connected to indoor units using field-supplied piping of refrigerant grade and correct size. The
liquid and suction line diameters can be determined from the physical data table. For piping applications beyond 25 feet
(7.62 m), please follow the instructions from ZAC refrigerant pipe sizing manual.
Outdoor unit connected to factory matched indoor unit:
Outdoor unit contain adequate system refrigerant charge for operating with matched indoor unit (as per corresponding
cooling capacity table) and when connected with up to 25 feet (7.62 m) of field-supplied piping.
Sweat connection:
Units are provided with service valves and are ready for brazing. After wrapping the service valve with a wet cloth, the
piping set can be brazed to service valve using either silver rod or silfos rod brazing materials.
LEAK TESTING & REFRIGERANT CHARGING
Leak test :
Leak can occur from joints or fittings that are improperly brazed/connected during installation of indoor and outdoor units.
The installer should leak test the indoor unit & associated field supplied refrigerant piping, then the outdoor unit, each
separately using electronic freon detector and/or soap bubbles.
Refrigerant Charging:
(To be used for system having a holding charge and to compensate for length of liquid line).
1. When system wired, piped and evacuated, the unit is ready for refrigerant charging. All charging lines and manifolds
must be purged with refrigerant vapor prior to admitting refrigerant into the system to prevent contamination system
with non-condensable.
2. It is important to first determine the amount of refrigerant required for the system, the unit nameplate normally identify
the weight of the refrigerant required.
3. The refrigerant should be added in small amounts allowing sufficient time for the unit pressure to equalize each time.
ELECTRICAL CONNECTIONS
Power wiring:
Before making wiring connection, check the electric power supply.
WARNING:
Power supply should match exactly with equipment nameplate ratings. Serious damage to
compressors and motors can occur, if improper voltage is applied.
Minimum circuit ampacity for each model is shown on the nameplate and product catalog. Equipment wiring diagram
should be examined and thoroughly understood before field wiring connections are made.
All wiring must comply with “National Electric Code” and local electrical standards.
Control wiring between outdoor & indoor unit:
For control wiring, use 16 gauge color-coded wire between the indoor and outdoor units.
Ground wires:
Connect ground wire to the ground lug inside the control box.
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