AB-6569
16
(3/3)
Item
Function
Description
Remarks
External contact input
(DI)
Alarm input
Input value of DI (digital input) 1 is reflected in the
alarm point. When the contact of DI 1 is open, NML
(0) is reflected. When the contact of DI 1 is closed,
ALM (1) is reflected.
Alarm input is applicable only to Models
WY5305W2010.
State input
Input value of DI (digital input) 2 is reflected in the
general DI point. When the contact of DI 2 is open,
OFF (0) is reflected. When the contact of DI 2 is
closed, ON (1) is reflected.
State input is applicable only to Models
WY5305W2010.
Interlock operation with
DI
FCU interlocking
with alarm input
When alarm input is “ALM”, FCU is turned off.
Concurrently, FCU start/stop operation with a user
terminal can be restricted.
FCU automatic start/stop operation is
not available when FCU interlocking with
alarm input is active.
FCU interlocking
with status input
When status input is “OFF”, FCU is turned off/
switched to setback operation. Concurrently, FCU
start/stop operation with a user terminal can be
restricted.
FCU automatic start/stop operation is
not available when FCU interlocking with
status input is active.
Notes:
1) Any combination of the following valves can be used for temperature control:
Chilled/hot water valve, chilled water valve, hot water valve, chilled water valve + hot water valve,
and chilled water valve + chilled/hot water valve*
The order of valve open/close operation can be set with parameters.
(e.g. chilled water valve
chilled/hot water valve OR chilled/hot water valve
chilled water valve)
2) “Water-priority” control is the method to open the valves first BEFORE the fan speed is increased. This prevents excessive fan speed
(airflow volume) and fan noise.
“Fan speed-priority” control is the method to widely open the valves AFTER the fan speed is increased. This ensures the temperature
difference between the coil inlet and outlet, leading to the effective chiller plant control.
3) VWV: Variable Water Volume
VWT: Variable Water Temperature
4) The latest start/stop operation with an analog user terminal may not take priority.
5) The latest setting operation with an analog user terminal does not take priority.
6) Dual setting is the method to have cooling setting and heating setting separately.
7) Control status is an index of FCU load. The index is used for supply air temperature control of OAHU or VWV/VWT control.
8) Temperature measuring for group monitoring calculates either the average value in a group or the representative value of a group.
