C. Complete all pipe connections in as short a time as possible. If
the pipe must be left standing for a long time after removing the
seal, it must be thoroughly purged with nitrogen, or dried with a
vacuum pump.
10.4. INSTALLATION, TRANSFERRING, SERVICING
10.4.1. Inspecting Gas Leaks with a Vacuum Pump for New Installations (Using
New Refrigerant Piping)
1. From the viewpoint of protecting the global environment, please
do not release refrigerant into the atmosphere.
A. Connect the projecting side (pin-pushing side) of the charging
hose for the manifold gauge to the service port of the 3-way
valve. (1)
B. Fully open the handle Lo of the manifold gauge and run the
vacuum pump. (2) (If the needle of the low-pressure gauge
instantly reaches vacuum, re-check step a).)
C. Continue the vacuum process for at least 15 minutes, then
check to make sure the low-pressure gauge has reached -0.1
MPa (-76 cmHg). Once the vacuum process has finished, fully
close the handle Lo of the manifold gauge and stop the vacuum
pumpoperation, then remove the charging hose that is
connected to the vacuum pump adaptor. (Leave the unit in that
condition for 1-2 minutes, and make sure that the needle of the
manifold gauge does not return.) (2) and (3)
D. Turn the valve stem of the 2-way valve 90 counter-clockwise to
open it, then, after 10 seconds, close it and inspect for a gas
leak (4)
E. Remove the charging hose from the 3-way valve service port,
then open both the 2-way valve and 3-way valve. (1) (4) (Turn
the valve stem in the counter-clockwise direction until it gently
makes contact. Do not turn it forcefully).
F. Tighten the service port cap with a torque wrench (18 N.m (1.8
kgf.m)). (5) Then tighten the 2-way valve and 3-way valve caps
with a torque wrench (42 N.m (4.2 kgf.m)) or (55 N.m (5.5
kgf.m)).
G. After attaching each of the caps, inspect for a gas leak around
the cap area. (5) (6)
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