4.3 Air Purging and Refrigerant Charge
4.3.1 Air purging
(1) The refrigerant
in the outdoor unit was charged
before shipment
. A
dditional refrigerant need
s
to
be charged into the refrigerant pipe during the field installation.
(2)
Ensure the outdoor unit's liquid and gas valves are closed completely.
(3) As shown in the following figure (Fig.10), expel the gas in
side
the indoor unit and
the
refrigerant p
ipe
with
the
vacuum pump.
"LO"Knob
"HI"Knob
Vacuum pump
high side
low side
Connection hose
liquid valve
Gas valve
Fig 10
(4) When the compressor is not running, charge the R410A refrigerant into the refrigerant pipe from the liquid
valve of the outdoor unit (do not
charge
from the gas valve).
4.3.2 Additional refrigerant charging
(1) Refrigerant Charge in the Outdoor Unit before Shipment
NOTICE
1)
The outdoor
unit has been charged
with
refrigerant
prior to
delivery. The refrigerant charge is not included
and is
an additional charge for
the indoor unit and the refrigerant pipe.
2) The amount of the additional refrigerant charge
depends
on the diameter and length of the liquid refrigerant
pipe which is
determined
by the actual yield installation requirement.
3) Record the additional refrigerant charge for future maintenance.
1
4
(2) Calculation of the Additional Refrigerant Charge
Additional Refrigerant Charge=
Length of Liquid Pipe
¶
0.375×54+
Length of Liquid Pipe
¶
0.25×22)-880
The
largest
additional refrigerant charge value is 800g.
This
means if the calculated value exceed
s
800g, the
additional refrigerant charge takes 800g, while the calculated value
takes
less than 800g, the additional refrigerant charge
takes the calculated value.
Specifications are subject to change without notice.
