OUTDOOR UNITS
2-46
TC-16001-rev.5
2.16 Additional Refrigerant Charge Calculation
Table 2.5 Additional Refrigerant Charge Calculation
Although this unit has been charged with refrigerant, additional refrigerant charge is required depending on
total piping length for the system.
Determine additional quantity of refrigerant required according to the following procedures, and charge it into
the system. Record the additional refrigerant quantity to facilitate future maintenance and servicing.
(1) Calculating Method of Additional Refrigerant Charge (
1
lbs)
Liquid Piping
Diameter
[in. (mm)]
Refrigerant Amount
For 1ft. Pipe
[lbs./ft. (kg/m)]
Additional Refrigerant Charge
Additional Charge
[lbs. (kg)]
Total Piping Length
[ft. (m)]
Additional
Refrigerant
Charge
Calculation
Total Refrigerant Charge Amount
Refrigerant Charge Amount of O.U. Before Shipment
036 - 060
Total Charge
[lbs. (kg)]
Model
()
()
()
φ3/8 (9.52)
φ1/4 (6.35)
0.034 x (0.05 x)
0.014 x (0.02 x)
7.9 (3.6)
Precharge
[lbs. (kg)]
1
2
3
= +
1 23
< Max. Additional Refrigerant Charge Quantity Allowed >
Outdoor Unit Capacity (MBH) 36 - 60
Max. Additional Ref. Charge Quantity: lbs (kg) 18.5 (8.4)
< Initial Ref. Charge Amount of O.U. (Before Shipment) (
2
lbs) >
Outdoor Unit Capacity (MBH) 36 - 60
W0 Outdoor Unit Ref. Charge: lbs (kg) 7.9 (3.6)
NOTE:
W0 is the outdoor unit refrigerant charge prior to shipment.
If there is a combination of base units, calculate the total refrigerant charge prior to shipment of those
combined outdoor units.
(2) Record of Total Charge
Total refrigerant charge of this system is calculated in the following formula.
3
Total Ref. Charge =
1
lbs +
2
lbs = lbs ( kg )
NOTES:
● When refrigerant is recovered or charged due to repairs, operating, or adjusting the unit, record the
refrigerant quantity again.
● Record the refrigerant charge amount on the nameplate attached to the reverse surface of the
service cover as well.
NOTE:
Ensure that the total additional charge
1
does not exceed the maximum additional refrigerant charge
quantity as shown in the table below.
1.
Emissions of the uorocarbons without any reason are prohibited
.
2.
For disposal and maintenance of this product, recovery of uorocarbons is required.
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