Outdoor Unit Model
6.5
5.5
5.0
See Example for Model 12HP, and fill in the following table.
12HP
17
(6) Additional Refrigerant Charge
If total piping length is move than 30m, it is necessary additional refrigerant charge as follows.
2. Charging Work
3. Record of Additional Charge
Record the refrigerant charging quantity in order to facilitate maintenance
and servicing activities.
Total refrigerant charge of this system is calculated in the following formula.
1. Calculating Method of Additional Refrigerant Charge (W kg)
Although refrigerant has been charged into this unit, it is required that additional refrigerant be charged according
to piping length.
A. Determine an 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.
Additional Refrigerant Charge Calculation
Additional Charge W = W
1
- P
= 3.1 - 2.0 = 1.1 (kg)
Total Ref. Charge of This System = W + W
0
This
System
= + =
kg
Charge refrigerant (R410A) into the system as follows.
(1) For charging refrigerant, connect the gauge mani-fold using charging hoses with a refrigerant cylinder to the check joint
of the liquid line stop valve.
(2) Fully open the gas line stop valve and slightly open the liquid line stop valve.
Charge refrigerant by opening the gauge mani-fold valve.
(3) Charge the required refrigerant by operating the system in cooling.
Ensure to charge correct volume by utilizing a weight scale. An excess or shortage of refrigerant is the main cause
of trouble to the units.
Fully open the liquid line stop valve after completing refrigerant charge.
<Table 1>
NOTE:
W
0
is outdoor unit ref. charge before shipment.
W
0:
Outdoor Unit
Ref. Charge (kg)
Pipe Diameter (mm)
Total Piping Length (m)
Additional Charge (kg)
φ
12.7 .....
(10)
x 0.12 = 1.2
φ
9.53 .....
(5 + 5 + 5 + 5)
x 0.07 = 1.4
φ
6.35 .....
(10 + 10)
x 0.03 = 0.6
Total Piping Length 50m
Additional Charge W
1
= 3.2 (kg)
Pipe Diameter (mm)
Total Piping Length (m)
Additional Charge (kg)
φ
12.7 .....
x 0.12 =
φ
9.53 .....
x 0.07 =
φ
6.35 .....
x 0.03 =
Total Piping Length m Additional Charge W = (kg)
kg
kg
Total Ref. Charge of This System
Date of Ref. Charge Work
Day Month
Year
Total Additional Charge W
No. 3
No. 1
No. 2
No. 0
φ
9.53x5m
φ
12.7x10m
φ
9.53x5m
φ
6.35x10m
φ
9.53x5m
φ
9.53x5m
φ
6.35x10m
<Example>
120
100
080
Summary of Contents for JDOH Series
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