Vacuuming And Charging - McQuay C Serie Installationsanleitung

Purging The Piping And The Indoor Unit
Except for the outdoor unit which is pre-charged with
refrigerant, the indoor unit and the refrigerant
connection pipes must be air-purged because the air
containing moisture that remains in the refrigerant cycle may
cause malfunction of the compressor.
• Remove the caps from the valve and the service port.
• Connect the center of the charging gauge to the vacuum
pump.
• Connect the charging gauge to the service port of the
3-way valve.
• Start the vacuum pump. Evacuate for approximately
30 minutes. The evacuation time varies with different
vacuum pump capacity. Confirm that the charging gauge
needle has moved towards -760mmHg.
Caution
• If the gauge needle does not move to -760mmHg, be
sure to check for gas leaks (using the refrigerant
detector) at flare type connection of the indoor and
outdoor unit and repair the leak before proceeding to
the next step.
• Close the valve of the changing gauge and stop the vacuum
pump.
• On the outdoor unit, open the suction valve and liquid
valve (in anti-clockwise direction) with 4mm key for
hexagon sacked screw.
Charge Operation
This operation must be done by using a gas cylinder and a
precise weighing machine. The additional charge is
topped-up into the outdoor unit using the suction valve via
the service port.
• Remove the service port cap.
• Connect the low pressure side of the charging gauge to
the suction service port center of the cylinder tank and
close the high pressure side of the gauge. Purge the air
from the service hose.
• Start the air conditioner unit.
• Open the gas cylinder and low pressure charging valve.

VACUUMING AND CHARGING

• When the required refrigerant quantity is pumped into the
unit, close the low pressure side and the gas cylinder valve.
• Disconnect the service hose from service port. Put back
the service port cap.
Indoor Unit
Vacuum
Pump
Indoor Unit
1-10
Refrigerant Piping
Allen Key
Flare Nut
Service Port
Outdoor Unit 3 Ways Valve
Liquid Side
Discharge Valve
Gas Side
Suction Valve
Open
Hi
Low
Close
Liquid Side
Discharge Valve
Gas Side
Check
Suction Valve
Valve
Hi
Low
Open
Close
Outdoor Unit
Close
Close
Outdoor Unit
Open
Open