Vacuuming And Charging; Additional Charge - McQuay IM-WMX-0603 Manual De Instalación

Purging the piping and the indoor unit
Except for the outdoor unit which is pre-charged with
refrigerant R22, 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 centre 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 towards -760mmHg,
be sure to check for gas leaks (using the refrigerant
detector) at flare type connection of the indoor and out-
door 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 (3 way) and
liquid valve (2 way) (in anti-clockwise direction) with
4mm key for hexagon sacked screw.

Additional charge

The refrigerant is pre-charged in the outdoor unit. If the
piping length is less than 7.6m, then additional charge after
vacuuming is not necessary. If the piping length is more
than 7.6m, then use the additional charge as indicated in the
table below.
Additional charge per meter
Model
10F / 15F
20F
10FR / 15FR
20FR
• R410A must be charged as liquid. Usually R410A cylinder is equipped with a dip-pipe for liquid withdrawal.
If there is no dip-pipe, the cylinder should be inverted so as to withdraw liquid R410A from the valve.
• Do not top-up when servicing leak, as this will reduce the unit perfomance. Vaccuum the unit thoroughly and then
charge the unit with fresh R410A according to the amount recommended in the specification.

VACUUMING AND CHARGING

R22/R410A
15 g/m
15 g/m
20 g/m
25 g/m
! Caution
Allen Key
Service Port
Indoor Unit
Open
Vacuum
pump
Low
Charge operation
This operation must be done by using a cylinder and a pre-
cise weighing machine. The additional charge is topped-
up into the outdoor unit using the suction valve via the ser-
vice 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 cylinder and low pressure charging valve.
• When the required refrigerant quantity is pumped into
the unit, close the low pressure side and the cylinder
valve.
• Disconnect the service hose from service port. Put back
the service port cap.
Liquid side
Indoor Unit
Gas side
Check
Valve
Low
Close
1-7
Refrigerant Piping
Flare Unt
Outdoor Unit
3 Ways Valve
Liquid side
Outdoor Unit
Discharge
Valve
Close
Gas side
Suction
Valve
Close
Hi
Close
Outdoor Unit
Discharge
Valve
Open
Suction
Valve
Open
Hi