Hitachi RAS-3HVRNM2, Инструкция по установке и обслуживанию, Страница: 48 / 58

2-120 TC-12001
OUTDOOR UNIT
44 P5414950-rev.1
9.3 Refrigerant Charging Quantity
Although the refrigerant has been charged into this
unit, the additional charge is required according to
the piping length. In the case of the actual piping
length is more than 30m, determine the additional
refrigerant quantity according to the following
procedure, and charge it into the system.
Record the additional refrigerant quantity to
facilitate maintenance and servicing activities
thereafter.
NOTE:
Some refrigerant charge calculations differ
when installing Wall Type with the expansion
valve kit. Refer the calculation to “Installation &
Maintenance Manual” of the indoor unit.
(a) The additional refrigerant charge is NOT
required in the case that the chargeless length
is within 30m (L < 30m).
(b) The additional refrigerant charge is required
in the case that the chargeless length is more
than 30m (L > 30m).
Calculate the additional refrigerant charge
quantity as follow.
Piping Length L = A + B + C + D
= 40 + 8 + 10 + 5 = 63
Chargeless Length "
:
30
Correction Value of Additional Ref. Amount
P: 0.06
Additional Charge Quantity W:
W = (L -
"
) x P
= (63 - 30) x 0.06
= 1.98 (kg)
NOTE:
Ensure that the additional charge quantity
should not be exceeded the maximum
additional refrigerant charge quantity.
< For Single Type >
< For Twin and Triple Type >
< For Quad Type >
< For Line Branch >
O
Calculate the additional refrigerant charge
quantity according to the table below.
W (Additional Ref. Charge Quantity) = (L -
"
) x P
L: Piping Length
" : Chargeless Length (Refer to the table above.)
P: Correction Value of Additional Ref. Amount
(Refer to the table above.)
< Calculating Method of Additional Refrigerant
Charge >
Calculate the piping length L (m).
< EXAMPLE for 6HP and Triple >
Outdoor
Unit
Ref.
Charging
Quantity
Before
Shipment
Chargeless
Length
(m) :
"
Correction
Value of
Additional
Ref.
Amount
P
Max.
Additional
Ref.
Charge
Quantity
(kg)
3HP 2.3
30
0.04 1.2
4HP 4.1 0.06 3.9
5HP 4.2 0.06 3.9
6HP 4.2 0.06 3.9
7HP 5.0 0.06 2.7
A
Piping Length L = A
A
B
C
D
(The figure shows for the triple.)
Piping Length L = A + B + C + D
A C
B
D E F G
Piping Length L = A + B + C + D + E + F + G
A B
C D
E
(The figure shows for the triple.)
Piping Length L = A + B + C + D + E
6HP
Outdoor Unit
Branch Pipe
Indoor Unit
A=40m
B=8m
C=10m
D=5m
2HP 2HP 2HP