EVACUATION INSTRUCTIONS
Before using the manifold gauge and vacuum pump,
read their operation manuals to familiarize yourself with
how to use them properly.
• Connect the charge hose of the manifold gauge to
service port on the outdoor unit’s low pressure valve.
• Connect another charge hose from the manifold
gauge to the vacuum pump.
• Open the low pressure side of the manifold
gauge. Keep the high pressure side closed.
• Turn on the vacuum pump to evacuate the system.
• Run the vacuum for at least 15 minutes, or until
the compound meter reads -76cmHG (-10 Pa).
• Close the low pressure side of the manifold
gauge, and turn off the vacuum pump.
• Wait for 5 minutes, then check that there has
been no change in system pressure.
• If there is a change in system pressure, refer to
Gas Leak Check
section for information on how
to check for leaks. If there is no change in system
pressure, unscrew the cap from the packed valve
(high pressure valve).
FIG. 6.1
FIG. 6.2
• Insert hexagonal wrench into the packed valve
(high pressure valve) and open the valve
by turning the wrench in a .25" counterclockwise
turn. Listen for gas to exit the system, then close
the valve after 5 seconds.
• Watch the Pressure Gauge for one minute to
make sure that there is no change in pressure.
The Pressure Gauge should read slightly higher
than atmospheric pressure.
• Remove the charge hose from the service port.
• Using hexagonal wrench, fully open both the
high pressure and low pressure valves.
• Tighten valve caps on all three valves (service
port, high pressure, low pressure) by hand. You
may tighten it further using a torque wrench if
needed.
OPEN VALVE STEMS GENTLY
When opening valve stems, turn the hexagonal wrench
until it hits against the stopper.
DO NOT
try to force the
valve to open further.
WARNING
NOTE: ON ADDING REFRIGERANT
Some systems require additional charging depending on pipe lengths. The standard pipe length varies
according to local regulations. For example, in North America, the standard pipe length is 7.5m/25’.
In other areas, the standard pipe length is 5m/16‘. The additional refrigerant to be charged can be
calculated using the following formula:
ADDITIONAL REFRIGERANT PER PIPE LENGTH
Connective Pipe
Length (m)
Air Purging
Method
Additional Refrigerant
< Standard pipe length Vacuum Pump
N/A
> Standard pipe
length
Vacuum
Pump
Liquid Side: Ø 6.35 (ø 0.25”)
R22:
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 0.32oZ/ft
Inverter R410A:
Fixed-frequency R410A:
Inverter R410A:
Fixed-frequency R410A:
(Pipe length – standard length) x 15g/m
(Pipe length – standard length) x 0.16oZ/ft
(Pipe length – standard length) x 20g/m
(Pipe length – standard length) x 0.21oZ/ft
(Pipe length – standard length) x 40g/m
(Pipe length – standard length) x 0.42oZ/ft
Liquid Side: Ø 9.52 (ø 0.375”)
R22:
(Pipe length – standard length) x 60g/m
(Pipe length – standard length) x 0.64oZ/ft
(Pipe length – standard length) x 30g/m
(Pipe length – standard length) x 0.32oZ/ft
DO NOT MIX REFRIGERANT TYPES.
CAUTION
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