Product data
APPLICATION DATA (cont)
FITTING LOSS IN EQUIVALENT FT FOR ELBOWS
TUBE SIZE
O.D. (in.)
90-DEGREE
SHORT
RADIUS
90-DEGREE
LONG
RADIUS
45-DEGREE
SHORT
RADIUS
5
⁄
8
1.6 1.0 0.8
3
⁄
4
1.8 1.2 0.9
7
⁄
8
2.0 1.4 1.0
1
1
⁄
8
2.6 1.7 1.3
e) Changes in piston size — The metering device for
a long-line application must be adjusted to com-
pensate for the frictional losses due to the long re-
frigerant lines, refrigerant line accessories, and
indoor coil above or below the outdoor unit. The
AccuRaterT refrigerant metering device piston
may need to be changed to provide this adjust-
ment. The AccuRater piston should be changed
for the indoor unit depending upon system con-
figuration and line length. Use the Change in In-
door Unit Piston Size for Elevation table on next
page to determine correct AccuRater piston size.
The standard piston size is shown in the System
Piston Guide and Refrigerant Charges table on
page 43.
Horizontal configuration — If the total equivalent
horizontal length is 100 ft or longer, the indoor pis-
ton must be increased one full piston size, in ad-
dition to the charge change in Step g), page 45. If
exact size is not available, use next smaller size
per Chattleff Type B Common Piston Sizes table.
Elevated configuration — After finding the appro-
priate change in piston size, add or subtract the
change from the original piston size number. If the
piston size is decreased, round down to the next
common piston size. If the piston size is in-
creased, round the new piston size up to the next
common piston size.
CHATTLEFF TYPE B COMMON PISTON SIZES
PISTON SIZE PISTON SIZE PISTON SIZE
32 53 80
33 55 81
35 57 82
36 59 84
37 61 86
38 62 88
39 63 89
40 65 90
41 67 92
42 68 93
43 70 96
45 71 98
47 73 101
49 74 104
51 76 —
52 78 —
EFFECTIVE CAPACITY LOSS
NOMINAL
UNIT SIZE*
(Btuh)
STANDARD
VAPOR LINE (in.)
LONG-LINE
VAPOR LINE (in.)†
PERCENT COOLING CAPACITY LOSS
50 ft 75 ft 100 ft 125 ft 150 ft 175 ft 200 ft
18,000
5
⁄
8
5
⁄
8
24 6 7 91012
5
⁄
8
3
⁄
4
001 2346
24,000
5
⁄
8
5
⁄
8
46 9 111315 **
5
⁄
8
3
⁄
4
012 3456
30,000
3
⁄
4
3
⁄
4
234 57810
3
⁄
4
7
⁄
8
023 4567
36,000
7
⁄
8
7
⁄
8
24 6 7 91113
7
⁄
8
7
⁄
8
023 4567
48,000
7
⁄
8
7
⁄
8
46 9 111315 **
7
⁄
8
7
⁄
8
34 5 7 81013
7
⁄
8
1
1
⁄
8
123 4567
60,000
1
1
⁄
8
1
1
⁄
8
47 9 111315 **
1
1
⁄
8
1
1
⁄
8
235 68911
*Nominal cooling capacity of the unit being specified.
†The vapor line diameter that may be selected for long-line application. If smaller vapor lines than are
specified in the table are selected, a larger capacity loss will occur. If larger vapor lines are selected,
refrigerant oil return will be impaired due to velocity loss.
**Not recommended due to excessive loss of capacity.
44