MovinCool 24HFU Service Manual - Manual (Page 42)

MOVINCOOL 24HFU / 24HFU-1 SERVICE PAGE 42
REPAIR - INSPECTION AND REPAIR OF REFRIGERANT SYSTEM
■ Vertical Down Joint
■ Vertical Up Joint
(3) USE OF DRY NITROGEN GAS
During brazing, the inside of the pipe
undergoes an oxidative reaction due
to the brazing flame. Introduce dry
nitrogen gas (1l/min.; adjust with the
flow regulator) through the pinch-off
tube of the refrigerant cycle to prevent
oxidation.
NOTE
Take care not to allow dirt, water, oil, etc. to enter
into the pipe
(4) VERTICAL JOINT
Heat the whole brazed fitting to a
proper brazing temperature. Bring the
brazing filler metal into contact with
the fitting so that the brazing filler
metal starts flowing by itself. Stop
heating the fitting as soon as the
brazing filler metal has flown into the
clearance. Since the brazing filler
metal flows easily into the portion
heated to a proper temperature, it is
essential to keep the whole fitting at a
proper brazing temperature.
5-2-2. Removal of Refrigerant Cycle
Components
CAUTION
1.Before any refrigerant cycle component can be
replaced, it is necessary to recover the refriger-
ant using standard recovery procedures and
equipment.
2.To prevent oxidation, dry nitrogen should be
conducted (flow rate 1l/min) through the pinch-
off tube during any brazing operation.
3.During any component replacement involving
brazing, shield nearby parts with a steel plate,
asbestos, etc., to protect them from the flame.
1. Evaporator
2. Capillary tube
3. Condenser
4. Compressor
NOTE
Hold the compressor body, not the tube, when
carrying the compressor.
■ Removal of Refrigerant Cycle Components