CACH/CAHH/CAHJ & CACH/CAHH/CAHK
Air Handlers
• Installation, Operation and Maintenance Manual •
P/N 240008108, Rev. G [07/08/10]
15
Refrigerant Piping
CAUTION
Avoid piping on wet and rainy days.
•
Use only clean, refrigeration-grade
•
copper tubing.
Use tubing benders to guard against
•
kinking.
Be certain no burrs remain on the
•
fi tt ings.
Cap ends of lines until ready for con-
•
nections. Be certain that plastic end
caps remain in place when inserting
through wall openings.
Insulate the suction and condensate
•
lines all the way to the cassett e.
Isolate tubing from transmitt ing vibra-
•
tion to the building or unit and avoid
contact with sharp edges.
Wrap refrigeration valves with a wet
•
rag “heat sink” to protect valves while
brazing. (See Figure 16, Page 16 .)
DO NOT use a suction line size larger
•
than the condenser service valve con-
nection. Th
is can harm the compres-
sor. Install a reducer, when used, only
on the inside connection.
NOTICE
Th
e cassett e is equipped with a Flo Rater
piston expansion device. Connections
are sweat type.
Piping connections at unit
Figure 14
Suction Line
Liquid Line
Suction Lin
ne
Liquid Li
ne
Liq
(When a reducing bushing is required, install
only at the indoor suction-line connection.)
Line sizing
Size lines per (
1.
Table 11, Page 60 ).
Th
e suction line size must match the con-
2.
denser service valve connection.
When matching the model 24 with an
a.
18,000-Btuh condenser, you must use
a 5/8-inch suction line, with a reducer
installed as shown in ( Figure 14,
Page 15 ).