ESIE09-08B Test Operation
Test Operation 73
pipe (if piping work is carried out during the raining season or over a long period of time,
rainwater may enter the pipe during work).
After evacuating the system for 2 hours, pressurize the system to 0.05 MPa (v
acuum break)
with nitro
gen gas and evacuate the system again using the vacuum pump for 1 hour to –100.7
kPa (vacuum drying). If the system cannot be evacuated to –100.7 kPa within 2 hours, repeat
the operation of vacuum break and vacuum drying.
Then, after leaving the system in vacuum for 1 hour, confirm that the vacuum gauge does not
rise.
If the indoor unit is changed by another indoor unit, do the above described leaktest again.
1.3 Additional Refrigerant Charge
Refrigerant cannot be charged until field wiring has been completed.
Refrigerant may only be charged after performing the leak test and the vacuum drying (see
above).
When charging a system, care shall be taken that its maximum permissible charge is never
exceeded, in view of the danger of liquid hammer.
Charging with an unsuitable substance may cause explosions and accidents, so always
ensure that
the appropriate refrigera
nt (R-410A) is charged for outdoor unit, use (R-134a) for
indoor unit.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when chargin
g refrigerant.
When perf
orming service on the unit requiring the refrigerant system to be opened,
refrigerant must be evacuated according to local regulations.
When the power is on, please close the front panel when leaving the unit.
To avoid compressor breakdown. Do not charge the refrigerant more than the specified
a
mou
nt.
This outdoor unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some s
ystems require additional charging of refrigerant.
In case re-charge is required, refer to the nameplate of the unit. The nameplate states the
type of refrigerant
and necessary amount.
Prec
autions when recharging/adding R-410A & rechar
ging R-134a
Be sure to charge the specified amount of refrigerant in liquid state to the liquid pipe.
Since this refrigerant is a mixed refrigerant, adding it in gas form may cause the refrigerant
composition to change, preventing normal operation.
Before chargin
g, check whether the refrigerant cylinder is equipped with a siphon tube or
not.
Filling using a cylinder with a syphon attached.
Remark for R-134a: Never recharge more tha
n mentioned on factory
name plate.
Charge the liquid
refrigerant with the cylinder
in upright position.
Charge the liquid
refrigerant with the cylinder
in up-side-down position.
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