McQuay MWSC 010 Series Manual page 44

Additional Charge
The refrigerant is pre-charged in the outdoor unit. If the piping length is less than 5m, then additional charge after
vacuuming is not necessary. If the piping length is more than 5m, then use the additional charge valve as in the table
below.
MODEL
MWSC 010 B/BR
MWSC 015 B/BR
MWSC 020 B/BR
MWSC 025 B/BR
MWSC 030 B/BR
MWSC 050 B/BR
Additional charge operation
The operation must be done by using gas cylinder and precise weighting machine obligatorily. The additional charge
is top-up into the outdoor unit using the suction valve via the service port.
ó Remove the service valve plug.
ó Connect the low pressure manifold to the suction service port, center manifold to the cylinder tank and close the
high pressure manifold (see fi gure below). Purge all the fl exible hose with refrigerant gas.
ó Start the air conditioner unit.
ó Open the gas cylinder and low pressure manifold valve.
ó When the required refrigerant quantity is pumped into the unit, close the low pressure manifold and the gas
cylinder valve.
ó Disconnect the manometer and the gas cylinder. Put back the service port cap.
GAS VALVE
FLEXIBLE HOSE
Check refrigerant leak
Check whether there is a leak on the fl are type connection of the indoor unit and the outdoor unit using a refrigerant
detector,.
Hints : After operating the unit for some times, check whether there is any oil traces indicating there is a leak.
R22 CHARGE (±5g/m)
22
22
22
25
50
60
OUTDOOR UNIT
REFRIGERANT PIPING
LOW SIDE
PRESSURE GAUGE
LIQU ID VALVE MANIFOLD
INDOOR UNIT
HIGH SIDE
PRESSURE GAUGE
FLEXIBLE HOSE
Page 43
REFRIGERANT
GAS TANK
R22
WEIGHING
MACHINE