3
HWE1305A
SAFETY PRECAUTIONS
1. SAFETY PRECAUTIONS
1-1. Always observe for safety
Before obtaining access to terminal, all supply
circuits must be disconnected.
1-2. Cautions related to new refrigerant
Cautions for units utilising refrigerant R410A
Use new refrigerant pipes.
In case of using the existing pipes for R22, be careful with
the followings.
•
Be sure to perform replacement operation before test run.
•
Change flare nut to the one provided with this product.
Use a newly flared pipe.
•
Avoid using thin pipes.
Make sure that the inside and outside of
refrigerant 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.
Contamination inside refrigerant piping can cause
deterioration of refrigerant oil etc.
Store the piping indoors and keep both ends of
the piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
compressor.
The refrigerant oil applied to flares and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a small amount.
If large amount of mineral oil enters, that can cause
deterioration of refrigerant oil etc.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrigerant
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.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necaessary to use R410A
refrigerant.
Tools for R410A
Gauge manifold
Flare tool
Charge hose
Size adjustment gauge
Gas leak detector Vacuum pump adaptor
Torque wrench
Electronic refrigerant charging scale
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of
compressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigerant
will change and the efficiency will be lowered.
Use the specified refrigerant only.
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the
unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the
spec labels provided with our products.
We will not be held responsible for mechanical failure,
system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with a
flame, poisonous gases will be released.
<1> Cautions for service
(1)
Perform service after recovering the refrigerant left in unit completely.
(2)
Do not release refrigerant in the air.
(3)
After completing service, charge the cycle with specified amount of refrigerant.
(4)
When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
