Panasonic S-3650PU3E Technical Data & Service Manual page 168

1
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]
• Use an Allen wrench.
Direction to open
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
ø 6.35
ø 9.52
ø 12.7
ø 15.88
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.
INCASE OF REUSING EXISTING REFRIGERANT PIPING
Observe the followings to decide reusing the existing refrigerant piping.
Poor refrigerant piping could result in product failure.
In the circumstances listed below, do not reuse any refrigerant piping. Instead, make sure to install a new piping.
Heat insulation is not provided for either liquid-side or gas-side piping or both.
The existing refrigerant pipe has been left in an open condition.
The diameter and thickness of the existing refrigerant piping does not meet the requirement. (Refer to above tables)
The piping length and elevation does not meet the requirement. (Refer to above tables)
Use only R32 or R410A genuine branch pipe.
Perform proper pump down for operated product before reuse piping.
In the circumstances listed below, clean it throughly before reuse.
Pump down operation cannot be performed for the existing air conditioner.
The compressor has a failure history.
Oil color is darken. (ASTM 4.0 and above)
The existing air conditioner is gas/oil heat pump type.
Do not reuse the fl are to prevent gas leak. Make sure to install a new fl are.
If there is a welded part on the existing refrigerant piping, conduct a gas leak check on the welded part.
Replace deteriorated heat insulating material with a new one. Heat insulating material is required for both liquid-side and ga
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.
Maximum temperature limit of gas or liquid piping is 120 °C
T g i h e t n n i g o t q r u e a ( p r p x o ) .
18.0 N•m (180 f•cm)
42.0 N•m (420 f•cm)
55.0 N•m (550 f•cm)
65.0 N•m (650 f•cm)
1-11-2-1-17
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.
F a l e r 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
Insulation material and silicone sealant. Please ensure
there are no gaps where moisture can enter the joint.
Tightening torque (approx.)
14N•m~18N•m
ø6.35 (1/4")
(140 f•cm~180 f•cm)
49N•m~55N•m
ø12.7 (1/2")
(490 f•cm~550 f•cm)
48.0N•m~59.8N•m
ø15.88
(480 f•cm~598 f•cm)
10.7N•m~14.7N•m
Service port
(107 f•cm~147 f•cm)
Piping
Caulking treatment, etc.
Insulation
material
F a l e r c o n fi guration
Application for ether-based oil
s-side piping.