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APPLICATION DATA (cont)
3) For line lengths over 50 ft (018,024 only):
a) A crankcase heater should be added to scroll
compressor units (all non-scroll compressor units
have crankcase heaters as standard). Crankcase
heaters help prevent refrigerant migration to the
compressor during the off cycle.
b) Any time the equivalent line length is over 100 ft,
a liquid line solenoid must be used. A liquid line
solenoid may also be required for vertical lift ap-
plications over 25 ft. See Step h) on page 22.
c) The accessory wind baffle is recommended.
d) The Effective Capacity Loss table on this page
provides the estimated percentage of nominal
cooling capacity losses based on the standard re-
quired vapor line size versus what is selected for
long-line applications.
Select the desired vapor line size from the Effec-
tive Capacity Loss table based on equivalent ft
and desired vapor line size.
Subtract the nominal percentage loss from the
unit cooling capacities for the given indoor and
outdoor combination.
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
CHATTLEFF 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 —
COOLING ONLY SYSTEM PISTON GUIDE AND REFRIGERANT CHARGES
INDOOR
UNIT
619E
OUTDOOR
UNIT
538
PISTON REQUIRED
(Size)
CHARGE
(Lb)*
009 C 009
None 1.5
012 C 012
None 1.8
018 A 018
49 4.6
024 A 024
57 5.3
*Charge based on 25 ft of interconnecting tubing. Charge may need to be added
for longer tubing runsor when used with certain fan coils. Check unitnameplate
for required charge.
NOTES:
1. All 018,024 pistons are Chattleff type.
2. All cooling units have a full factory charge.
3. Service valves are front-seating type.
HEAT PUMP SYSTEM PISTON GUIDE AND REFRIGERANT CHARGES
UNIT
COOLING
PISTON
SIZE
HEATING
PISTON
SIZE
REQUIRED
SYSTEM
CHARGE (Lb)*
Indoor
619E
Outdoor
538D
009 009 30 32 1.5
012 012 42 42 2.0
018 018 51 47 5.0
024 024 49 52 5.1
*Charge based on 25 ft of interconnecting tubing. Charge may need to be added
for longer tubing runsor when used with certain fan coils. Check unitnameplate
for required charge.
NOTES:
1. All 009,012 pistons are Aeroquip type. All 018,024 pistons are Chattleff type.
2. The 538D heat pumps have a holding charge only as shipped from the
factory.
EFFECTIVE CAPACITY LOSS
NOMINAL
UNIT SIZE*
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
13457910
5
⁄
8
3
⁄
4
0011223
24,000
5
⁄
8
5
⁄
8
25 8 1013** **
5
⁄
8
3
⁄
4
0012345
*Nominal cooling capacity of the unit being specified.
†The vapor line diameter that may be selected for long-lineapplication. If smaller
vapor lines than are specifiedin the table are selected, a larger capacityloss will
occur. If larger vaporlines are selected, refrigerant oilreturn will be impaired due
to velocity loss.
**Not recommended due to excessive loss of capacity.
NOTE: Long-line applications (50 ft and longer) are not permitted on 009, 012
systems.
21