Mitsubishi Electric PEAD-RP1.6EA, Technical & Service Manual

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SAFETY PRECAUTION
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<Cautions for units utilizing refrigerant R410A>
CAUTIONS RELATED TO NEW REFRIGERANT
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the following.
á For RP4 be sure to perform pipe replacement operation
before test run.
á Use flare nut as provided with this product.
Use a newlyflared pipe.
á Avoid using thin pipes. For the detail, please refer to the
outdoor unit service manual No. OC294.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
If no reverse flow check valve is used, vacuum pump oil
mayflow back into refrigerant cycle and that can cause
deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessaryto use R410A refrigerant.
Keep the tools with care.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder without syphone
tube.
If a charging cylinder is used without syphone tube, the
composition of refrigerant will change and the efficiency
will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools (for R410A)
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contamination
such as sulfur which is hazardous for use,
oxides, dirt, shaving particles, etc.
In addition, use pipes with specified thickness.
Store the piping to be used during installation
indoors and keep both ends of the piping sealed
until just before brazing. (Leave elbow joints, etc.
in their packaging.)
Use ester oil, ether oil or alkylbenzene oil (small
amount) as the refrigerant oil applied to flares
and flange connections.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change mayoccur in refrigerant and the efficiencywill be
lowered.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enter into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enter, that can cause deterio-
ration of refrigerant oil etc.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
[1] Cautions for installing or relocation of unit
(1) Perform service after collecting the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the system with the specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.