MovinCool 24HFU Service Manual - Manual (Page 45)

MOVINCOOL 24HFU / 24HFU-1 SERVICE PAGE 45
REPAIR - INSPECTION AND REPAIR OF REFRIGERANT SYSTEM
5-3-2. Evacuation
(1) Open the high pressure valve (HI) and
the low pressure valve (LO) of the
gauge manifold.
(2) Turn on the vacuum pump to start
evacuation. (Evacuate the system for
approximately 15 minutes.)
(3) When the low pressure gauge indi-
cates 750mmHg (30in.Hg) or larger,
turn off the vacuum pump and close
the high and low pressure valves of
the gauge manifold.
■ Evacuation
5-3-3. Checking Vacuum
(1) Leave the high pressure valve and the
low pressure valve of the gauge
manifold closed for five minutes or
more, and confirm that the gauge
pointer does not return to zero.
(2) If the gauge pointer returns gradually
to zero there is a leak somewhere in
the system (this could also include
gauge manifold). Perform leak check
according to procedure indicated in
5-3-4. Once leak has been found and
repaired evacuate the system once
more, and confirm system holds
vacuum.
■ Checking Vacuum
5-3-4. Checking Gas Leak
(1) Remove the charging hose (green)
from the vacuum pump, and connect
the hose to the refrigerant cylinder
(R22).
■ Evacuating Air Inside Charging Hose
(3) Connect the charging hoses (red -
high pressure side, blue - low pres-
sure side) of the gauge manifold to the
process tube fittings.
NOTE
Connect the hoses using care not to mistake the
high pressure side for the low pressure side and
vice versa.
(4) Connect the charging hose (green) at
the center of the gauge manifold to
the vacuum pump.
■ Connection of Gauge Manifold