Mars Comfort-Aire Century VCD24 SA Series Installation Manual page 46

24V SIGNAL CHART
Mode Priority
OFF
/
FAN
7
Cooling stage 1
Cooling stage 2
6
Dehumidification
Dehumidification
Heat pump stage 1
Heat pump stage 2 5
Heat pump stage 2
Electric heater kit 1
Electric heater kit 2
3
Electric heater kit 1 and
kit 2
Heat pump stage 1 +
Electric heater kit 1
Heat pump stage 1 +
Electric heater kit 2
Heat pump stage 2 +
Electric heater kit 1
Heat pump stage 2 +
Electric heater kit 1
Heat pump stage 2 +
Electric heater kit 2
4
Heat pump stage 2 +
Electric heater kit 2
Heat pump stage 1 +
Electric heater kit 1 and
kit 2
Heat pump stage 2 +
Electric heater kit 1 and
kit 2
Heat pump stage 2 +
Electric heater kit 1 and
kit 2
Emergency heat 1
Heating zone control
Heating zone control
Heating zone control
2
Heating zone control
Heating zone control
Heating zone control
Note:
1: 24V signal
0: No 24V signal
*: 1 or 0.
The AUU will turn off if the 24V input cannot meet the table.
Matching With Multi Zone Outdoor Unit
When matching with multi zone outdoor unit, the indoor unit cannot be started due to the mode conflict in the
following cases.
Mode Of AHU
Fan
Cooling
Dehumidification
Heating
Electric heat
Emergency heat
Note:
When Heating reaches the temperature and shuts down with other IDU zones heating normally, the AHU fan will stop running, and the Fan-ON mode is invalid.
The heat pump will start synchronously when Emergency heat or Electric heat is started.
When two AHU units are connected by multi zone outdoor unit, the above rules are applicable while one of the AHU unit regarded as other IDU zones.
24V input terminal
G Y1 Y/Y2 B
0 0 0 0
1 0 0
*
1 0 0
*
1 0
* *
1 0 0
*
1 0
* *
1 0 1
*
1 1
* *
* * * *
0 0
* *
0 0
* *
0 0
* *
1 0 1
*
1 0 1
*
1 1
* *
* * * *
1 1
* *
* * * *
1 0 1
*
1 1
* *
* * * *
* * * *
1 0 1
*
1 1
* *
* * * *
0 0
* *
0 0
* *
0 0
* *
Mode Of other IDU zones
Heating/ Electric heat/
Emergency heat
Fan/Cooling/Dehumidification
45
Installation and Operation Manual - VCDxxSA
W W1 W2
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
1 0 0
0 1 0
0 0 1
0 1 1
0 1 0
0 0 1
0 1 0
1 1 0
0 0 1
1 0 1
0 1 1
0 1 1
1 1 1
* * *
0
* *
0
* *
1
* *
0 1 0
0 0 1
0 1 1
46
E/AUX DH/DS/BK Fan speed
Display
OFF
0 0
*
Low
0 1
*
0 1 Mid 2
0 1 High 3
0 0 Low 4
0 0 Low 5
0 1 Mid 6
0 1 High
7
0 1 High
0 Turbo
*
8
0 Turbo
*
0 Turbo 9
*
0 1 Turbo
0 1 Turbo
0 1 Turbo
10
0 1 Turbo
0 1 Turbo
0 1 Turbo
0 1 Turbo
0 1 Turbo 11
0 1 Turbo
1 Turbo 12
*
0 0 Low
0 0 Low
0 0 Low
13
0 0 Low
0 0 Low
0 0 Low
Mode Conflict Unit
AHU
AHU
AHU
Other IDU zones
Other IDU zones
Other IDU zones