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W12=
W11=
1.1
5.8 Additional Refrigerant Charge
It is necessary to add additional refrigerant charge as follows.
1. Calculating Method of Additional Refrigerant Charge
A. Determine an to additional refrigerant quantity according to the following procedure, and charge it into the
system. B. Record the additional refrigerant quantity to facilitate service activities thereafter.
Although refrigerant has been charged into this unit, it is required that additional refrigerant be charged according
to piping length.
See Example for Model CHV6-60URBM, and fill in the following table.
Pipe Diameter in(mm) Total Piping Length ft (m) Additional Charge (lbs)
Total Piping Length 16ft
Total Piping Length
Additional R
ef.Charge
<EXAMPLE>
W11=
CHV6-60URBM
17
a
b
Ref.Charge
W0
W1
W2
a
b
100%~130%
130%~150%
CHV6-36URBM
8.4 0.026 0.013 17.4
CHV6-48URBM
8.4 0.026
0.013
17.4
CHV6-60URBM
9.0 0.026 0.013 17.4
0.33lbs for
each 10%
ķ
1.32lbs for
each 10%
ķ
W0+W1+W2
NOTE:ķLess than 10% is calculated as 10%.
Model
W0:
Ref.Charge
before
shipment
(lbs)
W1:
Additional
Ref.Charge according
to piping
(lbs/ft)
W2:
Additional Ref.Charge
according to
Connection Ratio
(lbs)
Wt˖
Total Ref.
Charge
(lbs)
Max. Total
Ref.
Charge
(lbs)
Additional Refrigerant Charge according to Table 5.9
Tabe 5.9 Additional Refrigerant Charge Calculation
W2 = 0
W2 =
Pipe Diameter (in) Total Piping Length (ft)
Additional Charge
W12=
Additional Refrigerant Charge Calculation
lbs
lbs
lbs
lbs
1/4
3/8
3.3
1/4
3/8
32.8
16.4
16.4
16.4
32.8
32.8
16.4
0.026
2.2
0.0134
3/8×32.8ft
3/8×16.4ft
3/8×16.4ft
1/4×16.4ft
3/8×16.4ft
1/4×32.8ft
1/4×32.8ft
lbs
lbs
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