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(6) Additional Refrigerant Charge
It is necessary additional refrigerant charge as follows.
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.
1. Calculating Method of Additional Refrigerant Charge (W kg)
<Example>
5HRNM1Q
See Example for Model RAS-5HRNMQ, and fill in the following table.
Pipe Diameter (mm)
Total Piping Length (m)
Total Piping Length
Total Ref.Charge
Pipe Diameter (mm)
Total Piping Length
Total Ref.Charge
2. Charging Work
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.
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.
Total Ref. Charge of This System
This System
Slim celing ducted type indoor unit 1.3/1.5HP, because the capacity of the indoor unit is small,additional one of the indoor
unit, the additional refrigerant need to reduce 150g.(If the calculation of the additional charge of less than 150g, then don't need
to add refrigerant, also don't need to release from the outdoor unit .)
Additional Refrigerant Charge Calculation
Additional Charge (kg)
Additional Charge
1.16 4.16
Total Piping Length (m)
Additional Charge (kg)
Additional Charge
= W1
+ W
=
+
<Table 1>
Outdoor Unit
3HRNM1Q
4HRNM1Q
5HR(Y)NM1Q
NOTE:
is outdoor unit ref. charge before shipment.
W
0
84
1.16
NOTE:
Additional refrigerant charge of the pipe diameter
are 0.03kg/m for model RAS-3HR(Y)NM1(Q)
and 0.04kg/m for model RAS-4~5HR(Y)NM1(Q).
It is 0.02kg/m for the pipe diameter
of all units
Total Additional Charge
Total Ref. Charge of This System
Date of Ref. Charge Work
0
Day
=
kg
15
W
0:
Outdoor Unit
Ref. Charge
kg
kg
Month
Year
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