8.2.1 Outdoor unit stop valve
Operation of stop valve should be performed according to the
figures and tables below:
Spindle Type
Stop valve (liquid)
Stop
valve
(gas)
Closed upon factory shipping
Spindle valve
Flare nut
Cap
Check joint for service port
Tightening Torque (Nm)
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
Gas
valve
Liquid
valve
9-11
7-9
68-82 34-42 33-42 33-42 14-18 14-18
Refrigerant pressure
Closed before shipment
Refrigerant piping
Hexagonal wrench
(field supplied) (*)
Spindle valve
Tighten the spindle with a torque above:
Counterclockwise…. Open
Clockwise …............ Close
Check joint
(Only charging hose can
be connected)
Tighten the cap with 16 Nm torque
Cap
Tighten the cap with 37 Nm torque
(Attach this after work)
Hexagonal wrench size used for spindle valve:
(*) Size
3HP
Gas valve
5 mm
Liquid valve
4 mm
Do not apply two
spanners at this
position. If applied,
leakage will occur
Stop valve
(Spindle type)
Flare nut
Use two spanners here
for pipe connection
Do not work with two
spanners here.
Refrigerant leakage
shall occur
!
C A U T I O N
• At the test run, fully open the spindle and ball stop valve.
• If not fully opened, the devices will be damaged.
• Do not attempt to turn service valve rod beyond its stop.
• Do not loosen the stop ring. If the stop ring is loosened, it is dangerous
since the spindle will hop out.
• An excess or a shortage of refrigerant is the main cause of trouble
to the units. Charge the correct refrigerant quantity according to the
description of label at the inside of service cover.
• Check for refrigerant leakage in detail. If a large refrigerant leakage
occurs, it will cause difficulty with breathing or harmful gases would
occur if a fire was being used in the room.
8.3 BRAZING WORK
!
C A U T I O N
• Use nitrogen gas for blowing during pipe brazing. If oxygen,
acetylene or fluorocarbon gas is used, it will cause an
explosion or poisonous gas.
• A lot of oxidation film will occur inside of tubes if no nitrogen
gas blowing is performed during brazing work. This film will
be flecked off after operation and will circulate in the cycle,
resulting in clogged expansion valves, etc. This will cause
bad influence to the compressor.
• Use a reducer valve when nitrogen gas blowing is performed
during brazing. The gas pressure should be maintained
within 0.03 to 0.05MPa. If a excessively high pressure is
applied to a pipe, it will cause an explosion.
REFRIGERANT PIPING & REFRIGERANT CHARGE
PMML0548 rev.0 - 04/2020 - A10648790A
9
EN