CHPF R-410A Service Manual

SERVICING
166
3. Table 5-2 lists multiplier values to recalculate system cooling capacity as a function of a system’s equivalent line
length (as calculated from the suction line) and the selected suction tube size.
NOTE: Select the proper suction tube size based on equivalent length of the suction line
(see Tables 5-1 and 5-2) and recalculated system capacity.
25 50 75 100 125 150 175 200 225 250
1/2 0.99 0.97 0.96 0.94 0.94 0.93 0.93 0.92 0.91 0.89
5/8 1.00 0.99 0.99 0.99 0.98 0.98 0.98 0.98 0.97 0.97
3/4 1.00 1.00 1.00 1.00 0.99 0.99 0.99 0.99 0.99 0.99
5/8 0.99 0.99 0.98 0.98 0.97 0.97 0.97 0.96 0.95 0.95
3/4 1.00 1.00 0.99 0.99 0.99 0.99 0.99 0.99 0.97 0.97
7/8
2
1.00 1.00 1.00 1.00 0.99 0.99 0.99 0.99 0.99 0.99
5/8 0.99 0.99 0.98 0.97 0.96 0.96 0.96 0.94 0.93 0.92
3/4 1.00 1.00 0.99 0.99 0.99 0.98 0.88 0.98 0.98 0.97
7/8 1.00 1.00 1.00 1.00 1.00 0.99 0.99 0.99 0.99 0.99
5/8 0.99 0.98 0.96 0.95 0.94 0.93 0.92 0.91 0.90 0.88
3/4 1.00 1.00 0.99 0.99 0.98 0.98 0.97 0.97 0.96 0.96
7/8
3
1.00 1.00 1.00 1.00 0.99 0.99 0.99 0.99 0.98 0.98
3/4 1.00 0.99 0.99 0.98 0.97 0.97 0.96 0.96 0.95 0.94
7/8 1.00 1.00 0.99 0.99 0.99 0.99 0.98 0.98 0.98 0.97
1 1/8 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00
3/4 0.99 0.99 0.98 0.97 0.96 0.96 0.95 0.95 0.94 0.93
7/8 1.00 0.99 0.99 0.99 0.98 0.98 0.98 0.98 0.97 0.97
1 1/8
4
1.00
1.00 1.00 1.00 1.00 1. 00 1.00 1.00 0.99 0. 99
3/4 0.99 0.98 0.97 0.96 0.94 0.93 0.93 0.91 0.90 0.89
7/8 1.00 0.99 0.98 0.98 0.97 0.97 0.96 0.94 0.95 0.95
1 1/8
4
1.00 1.00 1.00 0.99 0.99 0.99 0.99 0.99 0.99 0.99
48000
60000
24000
30000
36000
42000
Unit
(Btu)
Suction
Dia. (in)
Capacity Multiplier for Given Length (ft)
1
18000
Table 5-2. Capacity Multipliers
1
Equivalent length is to be used for capacity multiplier reduction.
2
7/8” suction line is not approved for 2-ton two stage heat pump applications.
3
7/8” suction line is not approved for 3-ton two stage heat pump applications over 80 feet.
4
1-1/8 suction line is not approved for 4-ton and 5-ton two stage heat pump applications over 80 feet.
4. Refrigerant Quantity Adjustment. All residential R-410A outdoor units are factory charged for 15 feet of line set.
To calculate the initial amount of extra refrigerant (in ounces):
a. Subtract 15 feet from the total linear (not equivalent) length of actual line set
b. Multiply that value by 0.6 (oz. per foot) of R-410A refrigerant
c. This will be the initial amount of R-410A refrigerant that must be added prior to final
charge adjustment.
All systems must have final charge adjustment performed as required in Section 1. In most residential applications
a minimal amount of additional refrigerant will be needed to account for the volume in the suction line. For some
applications using 1 1/8” suction line and/or over 150 feet of lineal length, approximately 3 pounds of additional
refrigerant may be needed to account for the suction line.
For a more precise calculation of refrigerant needs use Table 5-3. The additional refrigerant for given line lengths
can be found in Table 5-4.
R
A
(oz.) = (L
A
- 15) ft. x 0.6 oz./ft.
Where:
R
A
= Initial additional refrigerant needed
L
A
= Actual lineal line set length