Specifications
APPLICATION DATA (cont)
PISTON GUIDE — HIGH WALL SYSTEMS
UNIT
INDOOR PISTON
SIZE
OUTDOOR PISTON
SIZE
REQUIRED SYSTEM CHARGE
(lb)*
Indoor Outdoor
619E009 538D009 32† 30† 1.50
619E012 538D012 42† 42† 2.00
619E024 538D018 51 47 4.95
619E024 538D024 59 52 5.10
*Charge is based on 25 ft of interconnecting tubing. Charge may need
to be added for longer tubing runs or when used with certain fan coils.
Check unit nameplate for required charge.
†Non-serviceable Aeroquip piston.
NOTE: All pistons for size 018 and larger units are Chatleff ‘‘B’’ type.
PISTON GUIDE — CEILING-SUSPENDED SYSTEMS
UNIT
INDOOR PISTON
SIZE
OUTDOOR PISTON
SIZE
REQUIRED SYSTEM CHARGE
(lb)*
Indoor Outdoor
619C024 538B018 55 49 4.3
619C024 538B024 55 49 6.3
619C036 538B030 63 55 6.4
619C036 538C036 63 61 7.5/8.7†
619C048 538B048 84 78 10.0
619C060 538B060 96 82 11.9
*Charge is based on 25 ft of interconnecting tubing. Charge may need
to be added for longer tubing runs or when used with certain fan coils.
Check unit nameplate for required charge.
†Single-Phase/3-Phase.
NOTES:
1. All pistons are Chatleff ‘‘B’’ type.
2. All 538B heat pumps have a holding charge only as shipped from the
factory.
PISTON GUIDE — IN-CEILING CASSETTE SYSTEMS
UNIT
INDOOR PISTON
SIZE
OUTDOOR PISTON
SIZE
REQUIRED SYSTEM CHARGE
(lb)*
Indoor Outdoor
619F024 538B018 51 49 5.5
619F036 538B024 61 49 5.9
619F036 538B030 63 55 5.9/8.0
619F048 538B036 67 59 5.9/8.0†
*Charge is based on 25 ft of interconnecting tubing. Charge may need
to be added for longer tubing runs or when used with certain fan coils.
Check unit nameplate for required charge.
†Single-Phase/3-Phase.
NOTES:
1. All pistons are Chatleff ‘‘B’’ type.
2. All 538B heat pumps have a holding charge only as shipped from the
factory.
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
3
⁄
4
3
⁄
4
24 6 7 91113
3
⁄
4
7
⁄
8
023 4567
48,000
3
⁄
4
3
⁄
4
46 9 111315 **
3
⁄
4
7
⁄
8
34 5 7 81013
3
⁄
4
1
1
⁄
8
123 4567
60,000
7
⁄
8
7
⁄
8
47 9 111315 **
7
⁄
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, refrig-
erant oil return will be impaired due to velocity loss.
**Not recommended due to excessive loss of capacity.
67