Service manual

2
2-1. ALWAYS OBSERVE FOR SAFETY
Before obtaining access to terminal, all supply circuits must be disconnected.
2
SAFETY PRECAUTION
2-2. CAUTIONS RELATED TO NEW REFRIGERANT
Cautions for units utilizing refrigerant R410A
1
REFERENCE MANUAL
Preparation before the repair service.
• Prepare the proper tools.
• Prepare the proper protectors.
• Provide adequate ventilation.
• After stopping the operation of the air conditioner, turn off
the power-supply breaker.
• Discharge the condenser before the work involving
the electric parts.
Precautions during the repair service.
• Do not perform the work involving the electric parts
with wet hands.
• Do not pour water into the electric parts.
• Do not touch the refrigerant.
• Do not touch the hot or cold areas in the refrigerating cycle.
• When the repair or the inspection of the circuit needs to be
done without turning off the power,
exercise great caution not to touch the live parts.
Use new refrigerant pipes.
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
In case of using the existing pipes for R22, be careful with
the followings.
· Be sure to clean the pipes and make sure that the insides
of the pipes are clean.
· Change flare nut to the one provided with this product.
Use a newly flared pipe.
· Avoid using thin pipes.
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.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
INDOOR UNIT SERVICE MANUAL
Model name Service ref. Service manual No.
EHST20C-VM6HB
EHST20C-YM9HB
EHST20C-VM6B
EHST20C-YM9B
EHST20C-VM6EB
EHST20C-YM9EB
EHST20C-VM6SB
EHPT20X-VM2HB
EHPT20X-VM6HB
EHPT20X-YM9HB
EHPT20X-VM6B
EHPT20X-YM9B
EHST20C-VM6HB.UK
EHST20C-YM9HB.UK
EHST20C-VM6B.UK
EHST20C-YM9B.UK
EHST20C-VM6EB.UK
EHST20C-YM9EB.UK
EHST20C-VM6SB.UK
EHPT20X-VM2HB.UK
EHPT20X-VM6HB.UK
EHPT20X-YM9HB.UK
EHPT20X-VM6B.UK
EHPT20X-YM9B.UK
OCH531
EHSC-VM6B
EHSC-YM9B
EHSC-VM6EB
EHSC-YM9EB
EHPX-VM2B
EHPX-VM6B
EHPX-YM9B
ERSC-VM2B
EHSC-VM6B.UK
EHSC-YM9B.UK
EHSC-VM6EB.UK
EHSC-YM9EB.UK
EHPX-VM2B.UK
EHPX-VM6B.UK
EHPX-YM9B.UK
ERSC-VM2B.UK
OCH532
OCH525