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Design & installation Guide For McQuay MDS Multi System
J1 settings (1:ON: 0:OFF)
J1.3 reserved
J1.4: J1.5: J1.6: J1.7 capacity settings
No. J1.4 J1.5 J1.6 J1.7 Capacity
1 0 0 0 0 10.0KW/4HP
2 0 0 0 1 12.5KW/5HP
3 0 0 1 0 15.0KW/6HP
4 0 0 1 1 22.5KW/8HP
5 0 1 0 0 28.1KW/10HP
6 0 1 0 1 3HP
Note: Other DIP switches are reserved.
J1.1 J1.2
Initial opening extent
J1.1 J1.2
Initial opening extent
of the expansion valve of the expansion valve
0 0 300 1 0 400
0 1 350 1 1 450
Description of controller hardware
■ Input port:
The system contains 5 test ports designed for high/low pressure test, digital compressor
overload, constant speed compressor overload 1 and constant speed compressor overload 2
(used when 3 compressors are available)
■ Output port:
The system contains 9 output control ports including PWM valve, 4-way valve, digital compres-
sor/constant-speed compressor main power supply, high/medium/low wind, SI (reserved as the
main power supply for the second constant-speed compressor of the 3 compressor systems, if
applicable) and riving port for electronic expansion valve.
■ Sensor test port
The system has 7 temperature test ports designed to test the temperature of the digital
compressor exhaust, ambient temperature, return-air temperature, the bottom temperature of
compressor, inlet temperature, midlet temperature and outlet temperature (Note: The flow
direction of the refrigerant inside the coils when the system is running in cooling mode determines
the inflow and outflow direction described in this document).
■Communication port:
The system has two RS485 communication ports. One network with the indoor units and the
other is used for internetworking control.
■ DIP switch setting
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