Johnson Controls YVAHP0721CW Series, Service Manual

Page: 368 / 416

5-8
SM-16007
EXTERNAL INPUT/OUTPUT AND FUNCTION SETTING
• Setting Example
Fixing Heating Operation at Input 1 (between 1 and 2 pins of CN17)
Fixing Cooling Operation at Input 2 (between 3 and 2 pins of CN17)
(2) Input Demand Stoppage (Control Function No.3)
When the input terminals for Demand Stoppage on the outdoor unit PCB are short-circuited while running,
the compressor(s) is stopped. (In this case, the indoor unit(s) is put under Thermo-OFF condition. Cooling
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The stoppage code No. “10” is given. In this case, if the input terminals are opened, operation is resumed.
NOTE:
When demand control (ON/OFF) is performed, it is recommended that the control (ON/OFF) time is set
appropriately according to the heat load. Also, set the demand control time approximately once in 15
minutes at the minimum in consideration for saving energy.
Ɣ External Input Function Setting
The following signals can be received by the outdoor unit PCB. Refer to Table 5.1 below for the required
main parts.
(1) Input Fixing Heating Operation Mode (Control Function No.1),
Input Fixing Cooling Operation Mode (Control Function No.2)
When the input terminals for the setting operation mode on the outdoor unit PCB are short-circuited, the
operation mode can be set at the cooling or heating mode.
Short Circuit between Terminals 1 and 2 of CN17: Fixed Heating Operation Mode
Short Circuit between Terminals 2 and 3 of CN17: Fixed Cooling Operation Mode
During this set heating (or cooling) mode, no cooling (or heating) operation is possible. The indoor units
under the cooling or dry operation (or heating operation) will be changed to the Thermo-OFF condition
during this mode, and stoppage code No. “20” is given.
*Thermo-ON: The outdoor unit and some indoor units are running.
Thermo-OFF: The outdoor unit and some indoor units stay on, but don’t run.
• Setting Example
Demand Stoppage at Input 3 (between 1 and 2 pins of CN18)
Wiring Diagram Example of Fixing Operation Mode
X1: Auxiliary Relay
X2: Auxiliary Relay
SS3: Operation Mode Fixing Switch
SS2: Changeover Switch
Control Circuit
X2
(Heat)
X1
(Cool)
1
2
3
1
2
3
3P Connector
Outdoor Unit
PCB
CN17
SS3
SS2
Power
Source
X1 X2
(Heat) (Cool)
Control Circuit
X1
1
2
1
2
3
3P Connector
Outdoor Unit
PCB
CN18
Wiring Diagram Example of Demand Stoppage
SS3
Power
Source
X1
X1: Auxiliary Relay
SS3: Demand Stoppage Switch