Daikin LRLEQ5AY1 Manuel D'installation page 10

2.
Removing Pinch Piping
In the case of connecting refrigerant piping to the outdoor unit,
remove the span piping as in the following procedure.
Refer to "Operation method of shutoff valve" for handling of the
shutoff valve.
Liquid side and gas side
shutoff valves
Procedure 1
Confirm the shutoff
valve is closed.
Procedure 4
Melt the brazing
material with a burner
and remove the pinch
piping (large) after the
gas in the pinch
piping is discharged.
Piping on product side
Charge hose
Service port
On-site piping
Pinch piping (Large)
Pinch piping (Small)
Cut off
Procedure 3
Cut off the pinch piping (small) with an
appropriate tool, such as a pipe cutter, and
open the cross section to check that there
is no residual oil.
Note: If oil comes out of the cross section,
cut off the pinch piping (large) with a pipe
cutter and remove the pinch piping.
WARNING
Disconnect the pinch piping after collecting the refrigerant gas
in the piping.
The piping may be blown off and injury may result by melting the
brazing filler metal unless the refrigerant gas in the piping is all col-
lected.
Operation Method of Shutoff Valves
Follow the instructions below when operating each shutoff valve.
CAUTION
• Do not open the shutoff valve until the steps specified in
"8-3 Checking of device and installation conditions" is com-
pleted.
Do not leave the shutoff valve opened without turning the power
on, otherwise refrigerant may be condensed in the compressor
and the insulation of the main power supply circuit may be
degraded.
• Be sure to use an exclusive tool to handle the shutoff valve. The
shutoff valve is not of back sheet type. Excessive force imposed
may break the valve.
• Use a charge hose when using the service port.
• Make sure that there is no refrigerant gas leakage after the valve
cover and cap are securely tightened.
8
Service port
Procedure 2
Connect a charge hose to
the service port of the liquid
side and gas side shutoff
valves and remove the gas
from the pinch piping.
Pinch piping
〈Tightening torque〉
Check with the following table the sizes of shutoff valves incorporated
by each model and the tightening torque values of the respective
shutoff valves.
Shutoff valve sizes
5A type 6A type 8A type 10A type 12A type 15A type 20A type
Liquid side
φ9.5
shutoff valve
Gas side
φ19.1
shutoff valve
Sealing part
Tightening torque N•m (closes clockwise)
Shutoff
valve sizes
Shaft (valve body)
φ9.5
5.4~6.5
Hexagon
φ12.7 wrench: 4mm
8.1~9.9
φ19.1
Hexagon
27.0~33.0
wrench: 8mm
φ25.4
Hexagon
φ31.8
26.5~29.4
wrench: 10mm
〈Opening method〉
1. Remove the valve cover and turn the shaft anticlockwise with a
hexagon wrench.
2. Turn the shaft until the shaft stops.
3. Tighten the valve cover securely. Refer to the above table for the
tightening torque according to the size.
〈Closing method〉
1. Remove the valve cover and turn the shaft clockwise with a hexa-
gon wrench.
2. Tighten the shaft until the shaft comes in contact with the sealing
part of the valve.
3. Tighten the valve cover securely. Refer to the above table for the
tightening torque according to the size.
〈Handling Precautions for Valve Cover〉
• Be careful not to damage the sealing part.
• At the time of mounting the valve cover, apply a screw lock agent
to the screw thread.
• Do not apply a screw lock agent (for flare nut use) to the sealing
part.
• Be sure to tighten the valve cover securely after operating the
valve. Refer to "Operation Method of Shutoff Valves" for the
tightening torque of the valve.
Valve cover
Sealing part
Not apply a screw lock agent
φ12.7
φ25.4 φ31.8
Service port
Valve cover
Hexagon hole
Shaft
Valve cover Service port
13.5~16.5
18.0~22.0
11.5~13.9
22.5~27.5
44.1~53.9
Screw thread
Apply a screw lock agent
Shutoff valve
Part of mounting the
valve cover.
English