To Remove The Pinched Pipes; Guidelines When Installing A Sight Glass - Daikin LRLEQ3BY1 Installation And Operation Manual

5 Installation
b Sealing part (do NOT apply thread-locking fluid)
c Screw thread with thread-locking fluid
To handle the service port
▪ Always use a charge hose equipped with a valve depressor pin,
since the service port is a Schrader type valve.
▪ After handling the service port, make sure to tighten the service
port cover securely. For the tightening torque, refer to the table
below.
▪ Check for refrigerant leaks after tightening the service port cover.
NOTICE
Thread-locking fluid. Before reattaching the service port
cover, apply thread-locking fluid to the screw thread (NOT
to the cover or sealing part). Otherwise, condensation
water might enter and freeze. Possible consequence:
Deformation, refrigerant
malfunction.
a
b
c
a Cover (do NOT apply thread-locking fluid)
b Sealing part (do NOT apply thread-locking fluid)
c Screw thread with thread-locking fluid
Tightening torques
Stop valve Tightening torque N•m (turn clockwise to close)
size (mm)
Valve body Hexagonal
wrench
Ø9.5 5.4~6.6 4 mm
Ø15.9 13.5~16.5 6 mm
5.3.2

To remove the pinched pipes

WARNING
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
Failure to observe the instructions in procedure below
properly may result in property damage or personal injury,
which may be serious depending on the circumstances.
Use the following procedure to remove the pinched piping:
1 Remove the valve cover and make sure that the stop valves are
fully closed.
a
b
c
d
a Service port and service port cover
b Stop valve
c Field piping connection
d Stop valve cover
2 Connect the vacuuming/recovery unit through a manifold to the
service port of all stop valves.
Installation and operation manual
14
leakage and compressor
Shaft
Cap (valve Service
lid) port
13.5~16.5 11.5~13.9
22.5~27.5
p < p >
A B
f
a
d
N2 R410A
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
3 Recover gas and oil from the pinched piping by using a
recovery unit.
CAUTION
Do not vent gases into the atmosphere.
4 When all gas and oil is recovered from the pinched piping,
disconnect the charge hose and close the service ports
5 Cut off the lower part of the gas and liquid stop valve pipes
along the black line. Use an appropriate tool (e.g. a pipe cutter,
a pair of nippers).
WARNING
Never remove the pinched piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the pinched piping.
6 Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
5.3.3

Guidelines when installing a sight glass

Install a sight glass on the liquid piping:
Diameter 9.5 mm
g
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P545024-1 – 2018.09