Carrier MMY-MAP0724FT9UL Service Manual page 84

Checklist 2
• Check the additional amount of refrigerant.
Calculate the additional amount of refrigerant from the additional amount of refrigerant (A) by the pipe
diameter on the liquid side, the pipe length to be connected, and the corrective amount of refrigerant (B)
according to system capacity.
Additional
refrigerant charge
amount (lb)
First, enter the total length for each liquid pipe diameter in the following table, and then calculate the additional
amount of refrigerant by pipe length.
<(A) : Additional amount of refrigerant by pipe length>
Pipe diameter on the
liquid side
Ø1/4"
Ø3/8"
Ø1/2"
Ø5/8"
Ø3/4"
Next, refer to the following table for the corrective amount of refrigerant (B) according to system capacity.
<(B) : Adjustment amount of rifrigerant according to system capacity>
Outdoor unit capacity type
072 type
096 type
120 type
144 type
168 type
192 type
216 type
240 type
Lastly, add the additional amount of refrigerant by pipe length (A) to the Adjustment amount of according
refrigerant to system capacity (B).
This is the final additional.
<Additional amount of refrigerant>
(A) : Additional amount of refrigerant by pipe length (lb)
(B) : Adjustment amount of refrigerant according to system capacity (lb)
(A) + (B) : Additional amount of refrigerant (lb)
Additional refrigerant
Actual length
= ×
charge amount
of liquid pipe
per liquid pipe 1 ft
(A)
Additional refrigerant
amount/1ft
(lb)
0.017 ×
0.037 ×
0.071 ×
0.108 ×
0.168 ×
Additional amount of refrigerant by pipe length (A)
Adjustment amount of
refrigerant (lb)
5.5
20.9
27.5
5.5
23.1
30.8
34.1
37.4
× 1.3 +
Total pipe length on
each liquid side
(ft)
Combined outdoor units
072 type
096 type
120 type
072 type
096 type
096 type
120 type
120 type
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Adjustment amount of refrigerant
according to system capacity
(B)
Additional mount of refrigerant pipe
diameter on each liquid side
(lb)
=
=
=
=
=
total
072 type
072 type
096 type
096 type
120 type
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