TESTING AND INSPECTION
Pipe Testing
VAC valve
Vacuum pump
Service port
Low pressure gauge
High pressure gauge
Gauge manifold kit
Pressure gauge (low-pressure)
Pressure gauge (hi-pressure)
Gauge manifold
Connection pipe
Cap
Cap
Service pipe
Cap
Hose with the valve pin
Hose
Vacuum pump
Hose
Switch (hi-pressure)
Switch (low-pressure)
Connection pipe (to indoor unit)
Liquid valve
Gas valve
Service port
Additional Charge
The outdoor unit contains enough refrigerant charge for up to 25 feet from the factory. When the piping
is greater than 25 feet, additional charging is necessary. For the additional amount, see the table below.
Model
Add’l Refrigerant Amount for Extra Pipe
9,000
0.21 oz/ft
20 g/m
12,000
0.21 oz/ft
20 g/m
18,000
0.54 oz/ft
50 g/m
24,000
0.54 oz/ft
50 g/m
Vacuum Procedure (con’t)
7. Confirm that manifold valves are closed and disconnect the vacuum pump.
8. Open the service valves to the fully ‘back-seat’ position to let the refrigerant flow to the
indoor unit and balance the pressure in system.
Important:
Do not allow air to enter the connection pipe when removing the hose.
9. Replace service valve caps and tighten.
Oil return bend
Indoor
Outdoor
20 ft.
Oil return bend
Oil Return Bend
When the outdoor unit is more than 30 feet above the indoor unit,
an oil return bend must be added for every 20 feet of connection pipe.
Condensate Drain Pipe Testing
Carefully and slowly add 8-10 ounces of water to the indoor unit drain pan.
• Verify the water drains easily out the condensate drain hose.
• If water does not drain easily from the drain hose, then remove kinks,
increase drain pitch, or add an auxiliary condensate drain pump.
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