6
Step 3 — Connect Refrigerant Piping and Wir-
ing —
Four refrigerant piping and wiring options are avail-
able:
• Front: Use the knockout on the front for this option.
• Side: Remove the L-shaped metal plate.
• Back: Remove the rubber blanket covering the support-
ing pipe.
• Bottom: Use the knockouts on the bottom from inside
out to create the pipe opening.
See Fig. 6 for details.
INSULATION — Liquid lines and suction lines must be insu-
lated separately. Closed-cell insulation with fire-retardant prop-
erties is recommended.
For copper pipes less than
1
/
2
in. OD, recommended insula-
tion thickness is
1
/
2
inch.
For copper pipes equal to or greater than
5
/
8
in. OD, recom-
mended insulation thickness is
3
/
4
inch.
PIPING CONNECTIONS BETWEEN OUTDOOR AND
INDOOR UNITS
Indoor units are connected to the outdoor units using branch
piping or branch box methods. See Fig. 7 and 8. Table 2 lists
main pipe sizes. Branch pipe sizing depends on the size of the
indoor unit selected. See Table 3. Table 4 lists the maximum
number of indoor units and connected capacity range per
38WAH outdoor unit. See Fig. 9 for allowable piping lengths
and elevation differentials.
Table 2 — Main Pipe Sizing
Table 3 — Branch Pipe Sizing
Table 4 — Maximum Indoor Unit Connections
CAUTION
During brazing, keep nitrogen in the pipes to avoid oxida-
tion inside the pipes. Use soapy water or refrigerant leak
detector to verify every joint in the refrigeration piping.
38WAH UNIT
CAPACITY
(tons)
MAIN PIPE SIZE
SUCTION SIDE
(in.)
LIQUID SIDE
(in.)
036
3
5
/
8
3
/
8
048
4
INDOOR UNIT SIZE
(Btuh)
SUCTION SIDE
(in.)
LIQUID SIDE
(in.)
7,000 to 15,000
1
/
2
1
/
4
18,000 to 48,000
5
/
8
3
/
8
38WAH UNIT
MAXIMUM NUMBER
OF INDOOR UNITS
CONNECTED
CAPACITY (%)
036
5
50 to 130
048
7
FRONT PIPE
SIDE PIPE
SUCTION PIPE
BACK PIPE
BOTTOM PIPE
A38-7437
Fig. 6 — Piping and Wiring Options
NOTE: All wiring must use conduit connection points provided and
comply with NEC (National Electrical Code) and local codes.
