Fujitsu AB12 User Manual

9-3 Difference from conventional model (R22) and precautions
OIL
• Use new synthetic oils such as ester because HFC
series refrigerant has less solubility with mineral oils
conventionally used for R22.
• As these new synthetic oils are easily influenced by
moisture and dusts, they must be treated morecare-
fully than the conventional lubricating oils.
CAUTION
For installation/servicing, take more precautions than
before to avoid moisture and dusts. Also, for st-
parts, same precautions must be taken.
2, 3-WAY VALVE
• Review material O-ring, valve core seal for securing
suitability with oil.
CAUTION
Check if the valve is suitable for the refrigerant (model) when replacing.
BALL VALVE
• Review material O-ring, valve core seal for securing
suitability with oil.
CAUTION
Check if the valve is suitable for the refrigerant (model)
when replacing.
DRYER
• Change desiccant (XH-6 XH-10) Volume of desic-
cant is increased.
CAUTION
Complete welding within one hour after the package of
dryer is opened.
PRESSURE SWITCH
• Adopt for some models for better reliability.
CAUTION
Check if the valve is suitable for the refrigerant (model)
when replacing.
OTHER PIPING
• Review the water, contaminants controlling level.
• Review thickness of pipes.
CAUTION
During storage, due care must be taken so that foreign
matters such as dust and water do not enter.
CAUTION
Check if the compressor is suitable for the refrigerant
(model) when replacing.
minutes after opening
the cap when replacing.
COMPRESSOR
• Use better grade of material for sliding parts for
securing good lubrication of sliding part as HFC
refrigerant does not contain chloride.
• Review insulating materials
• Increase pressure resistance strength
CAUTION
During storage, due care must be taken so that foreign
matters such as dust and water do not enter.
HEAT EXCHANGER
• Review the water,contaminants controlling level
• Use thinner tube to increase pressure Increase
capacity for resistance strength (only outdoor unit)
improving performance
CAUTION
Check if the valve is suitable for the refrigerant (model) when replacing.
4-WAY VALVE
• Review materials
CAUTION
Check if the valve is suitable for the refrigerant (model) when replacing.
CHECK VALVE
• Review materials
• Change shape of pipe ends to increase pressure resistance strength
oring
Complete welding within 15
– 130 –

Fujitsu AB12 Specifications

General

Brand	Fujitsu
Model	AB12
Category	Air Conditioner
Language	English