15
PIPING BETWEEN MDC AND OUTDOOR UNIT
Figure 15 shows the typical piping layout between the
outdoor unit, MDC, and sub MDC. Table 14 shows pipe
diameters to use when connecting the outdoor unit and main
MDC. Tables 15 and 16 show how to connect low and high
pressure pipes to specific outdoor unit models.
Table 14 — Main Piping Between Outdoor Unit and
Main MDC
Table 15 — Connecting High Pressure Pipes with
the Outdoor Unit
CAUTION
When connecting from an indoor unit to an outdoor unit,
the isolation valve at the outdoor unit should be in the
closed position throughout the refrigerant piping process.
Failure to follow this procedure may result in equipment
damage.
OUTDOOR MODEL
(kBtu/h)
HIGH
PRESSURE
SIDE (in.)
LOW
PRESSURE
SIDE (in.)
72
5/8
3/4
96
3/4
7/8
120
1-1/8
145
7/8
168
192
216
1-1/8
240
1-3/8
240L~288
312~336
1-5/8
Fig. 15 — Typical Piping Layout Between Outdoor
Unit and MDC
LEGEND
G, H ,Y —
Y-Joint
Outdoor unit
Standard/Main MDC
Sub MDC1
Sub MDC2
F
G
H
Sys tem that requ ires mo re tha n 16 branch po rts.
OUTDOOR
UNIT
CAPACITY
(kBtu/h)
CONNECTION DIAGRAM
72
96~120
144~192
216~240
240L~336
LEGEND
a
— MDC Unit
b
— ODU Pipe Accessory
c
— Pipe
5
/
8
d
— Cut Here
e
— Pipe
3
/
4
f
— Pipe
7
/
8
g
— ODU Pipe Accessory
h
— Pipe 1-
1
/
8
a
b
d
e
a
f
a
g
h
