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TWINNING MDC PORTS
CAUTION
Connecting an indoor unit with a capacity greater than
54 kBtu/h may result in damage to equipment.
For indoor units with capacities greater than 54 kBtu/h, two
MDC ports must be twinned using the Y-joint to create a single
port. The two ports to be paired should be next to each other.
Refer to Y-joint "G" in the piping layout; see Fig. 10. The first
port of the pair should have an odd number and second port
should be the next sequential even number. For example: 1 and
2, 3 and 4, or 5 and 6 and so on. You cannot pair 2 and 3, 4 and
5, or 6 and 7.
Table 8 shows the pipe diameters to use when connecting
the MDC and the Y-joint.
Table 8 — Piping Between the MDC and Y-Joint
TOTAL CAPACITY OF
INDOOR UNITS
(kBtu/h)
> 54
MDC
G
G
CORRECT
G
G
INCORRECT
LEGEND
G — Y-Joint
Fig. 10 — Twinning Ports with the Y-Joint
LIQUID PIPE
GAS PIPE
(in.)
(in.)
3
/
5
/
8
8
MDC
PIPING BETWEEN MDC AND SUB MDC — 3 pipes are
used to connect the main MDC and the sub MDC. Selection of
the Sub MDC should follow the requirements of Table 9. For
connecting the sub MDC to main MDC, use the high pressure,
low pressure and liquid pipes as shown in Fig. 10 and 11.
Table 9 —Sub MDC Selection
MAIN MDC MODEL
006
008
010
016/016L
8
SUB MDC UNIT
006
006
008
006
008
010
006
008
010
016
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