Precautions When Operating The 3-Way Valve For Piping Installation; Precautions For Connecting The Pipes; Precautions For Insulation Installation; Precautions For Flare Nut Installation - Panasonic Inverter R32 Series Technical Data & Service Manual

Precautions when operating the 3-way valve for piping installation

Do not open the 3-way valve until the piping installation is completed.
• It is closed during shipment.
• During installation the side panel may warp if only the fl are nut is loosened and tightened with a torque wrench.
As a result, always be sure to secure to the hexagonal part of the 3-way valve with a spanner, or other tool.
Refer to the following table for the tightening torque of the 3-way valve fl are nuts.
• If the nuts are over tightened, they may cause the fl ares to break or leak.
Do not add additional force to the valve's cover.
• Using spanners on the cover or valve itself (other than the hexagonal parts) may cause gas leakage.
Avoid using spanners on the cover or parts other than the hexagonal part of the valve.
Ensure to do the re-fl aring of pipes before connecting to units to
avoid leaking.
To prevent the ingress of moisture into the joint which could have the potential
to freeze and then cause leakage, the joint must be sealed with suitable
silicone and insulation material. The joint should be sealed on both liquid
and gas side.
[3-way valve operation method]
Opening : Open the cover and turn the Allen wrench counter-clockwise until it stops.
Closing : Open the cover and turn the Allen wrench clockwise until it stops.
Precautions for handling the valve cap
Ensure not to scratch the inner surface of the valve or the end of the valve shaft.
• Once adjustments to the valve are completed, ensure to tighten the valve cap according to the prescribed torque.
Precautions for handling the service ports
Use a push-rod with a charge hose.
• Once adjustments to the valve are completed, ensure to tighten the valve cap according to the prescribed torque.

Precautions for connecting the pipes

For proper connection, align the union and fl are straight with each other.
Ensure that the pipes do not come into contact with the compressor's bolts or exterior panel.
There is a risk of condensation from the 3-way valve coming out between the insulation material and the indoor unit's
piping when you install the outdoor unit above then the indoor unit. Ensure to caulk the connection parts.

Precautions for insulation installation

In high humidity environment, reinforce the insulation material for the refrigerant piping. Failure to do so may result in
condensation on the surface of the insulation material.
Use materials with good heat-resistant properties as the heat insulator for the pipes. Ensure to insulate both the gas side
and liquid side pipes.
If the pipes are not adequately insulated, condensation and water leakages may occur.
Ensure that the current insulation covers the pipes up to the unit's connecting part.
If the piping is exposed, it may cause condensation or burn (when touch the pipe).

Precautions for flare nut installation

Dimensions when adding fl are nuts and the tightening torque
P p i n i g i s e z T g i h
ø 6.35
(140
ø 9.52
(340
ø 12.7
(490
ø 15.88
(680
After piping connection has completed, ensure there is no gas leakage.
When tightening the fl are nut, coat the fl ares (inner surface only) with refrigerant oil on the fl ares
Firstly, screw in 3-4 turns by hand.
Ensure not to get oil on the screw part.
Refrigerant oil used is ether-based.
Once the piping connections are completed, perform leakage inspection using nitrogen gas.
When fl ared joints are reused, the fl are part shall be re-fabricated.
Class label
Interconnecting refrigerant pipework, i.e. pipework external to the unitary components, should be marked
with a Class label (see right fi gure) every two metres where the pipework is visible.
Label size is 50 mm×50 mm.
This includes pipework located in a ceiling space or any void which a person may access for maintenance
or repair work within that space.
• Use an Allen wrench (Size 4 mm or 6 mm).
Direction to open
Maximum temperature limit of gas or liquid piping exceeds 120 °C
e t n n i g o t q r u e a ( p r p x o ) . F a l e r
14.0 N•m~18.0 N•m
f•cm~180 f•cm)
34.0 N•m~42.0 N•m
f•cm~420 f•cm)
49.0 N•m~55.0 N•m
f•cm~550 f•cm)
68.0 N•m~82.0 N•m
f•cm~820 f•cm)
Insulation material and silicone sealant. Please ensure
there are no gaps where moisture can enter the joint.
Silicone Sealant must be neutral cure and ammonia free. Use of silicon containing
ammonia can lead to stress corrosion on the joint and cause leakage.
s e t c o i n i d m e n s o i n s A
8.7 ~ 9.1 mm
12.8 ~ 13.2 mm
16.2 ~ 16.6 mm
19.3 ~ 19.7 mm
1-11-27
Valve shaft
Service port
Valve cap
Hexagonal part
of the valve
Spanner
(Secure)
Torque
wrench
Flare nut
Gas side
Valve shaft
Service port
Valve cap
Torque
wrench
Flare nut
Liquid side
(Please use a single, open-end spanner to loosen and
tighten the liquid side 3-way valve fl are nut.)
Tightening torque (approx.)
20.6N•m~28.4N•m
ø9.52
(206 f•cm~284 f•cm)
(Liquid side)
ø15.88 48.0N•m~59.8N•m
(480 f•cm~598 f•cm)
(Gas side)
10.7N•m~14.7N•m
Service port
(107 f•cm~147 f•cm)
Piping
Caulking treatment, etc.
Insulation
material
fi
F a l e r c o n guration
Application for ether-based oil
1