Daikin EWWQ-G - Page 64

EWWQ090G ÷ EWWQ720L - R410A - Water-cooled scroll chillers
EWLQ090G ÷ EWLQ720L - R410A - Condenser less
EWHQ100G ÷ EWHQ400G - R410A - Heat pump scroll chillers
EWAQ-G 075 - R410A - Air-cooled scroll chillers
EWAQ- - R410A - Air-cooled scroll chillers
EWYQ- - R410A - Air-cooled scroll heat pumps
Air and Water cooled scroll chillers & heat pump
Operation
Manual
Operation Manual
64
EWWQ - EWLQ - EWHQ
EWAQ - EWYQ
Air or Water cooled scroll chiller &
heat pump
D-EOMHW00107-15EN
Standby Chiller
No
No
Auto
Master
Slave 1
Slave 2
Slave 3
No = There are not standby chiller in the Master Slave network
Auto = One of the chillers of the Master Slave network will be always assigned as standby
chiller. The rotation of the standby chiller will be performed according to the configuration set
through the parameters Rotation Type and Interval Time
Master = Master chiller is always set as standby chiller
Slave 1 = The Slave 1 chiller is always set as standby chiller
Slave 2 = The Slave 2 chiller is always set as standby chiller
Slave 3 = The Slave 3 chiller is always set as standby chiller
Step 2 : Define rotation type of the standby chiller.
Define the rotation type of the standby chiller make sense only if the parameter Standby Chiller is
set as Auto
Setpoint/Sub-
Menu
Range
Description
Rotation Type
Time,
Sequence
Time = The next Standby chiller will be the chiller with most running hours at the moment of the
changeover
Sequence = The next standby chiller will be the next according to the following sequences:
- network with one slave: Master  Slave 1  Master
- network with tow slaves: Master  Slave 1  Slave 2  Master
- network with three slaves: Master  Slave 1  Slave 2  Slave 3  Master
Step 3 : Interval time for rotation of the Standby Chiller.
Define the interval time for rotation of the Standby Chiller make sense only if the parameter
Standby Chiller is set as Auto
Setpoint/Sub-
Menu
Default
Range
Description
Interval Time
7 Days
1…365
Define the interval time (expressed in day) for the rotation of the standby
chiller.
Switch Time
00:00:00
00:00:00…23:59:59
Define the time within the day when will be performed the switch of the
standby chiller
Step 4 : Enable of Temperature Compensation function
Choose if enable the temperature compensation function
Setpoint/Sub-
Menu
Default
Range
Description
Tmp Cmp
No
No,Yes
No = The standby chiller becomes operating only in the following case:
1. At least one chiller is in alarm state.
2. At least one of the Slave chillers is in communication alarm with the Master
chiller.
3. At least one chiller is not enabled.
Yes = The standby chiller becomes operating in all previous cases and also if the all
other chillers are running at the maximum capacity and the water temperature setpoint is
not reached for at least a specific time defined by the parameter Tmp Comp Time
Tmp Comp Time
120 min
0…600
Time constant in which the system has to be at maximum capacity and the setpoint not
reached before that the standby chiller will be enabled.
Step 5 : Reset
The reset command can be used to force the rotation of the standby chiller.
Setpoint/Sub-
Menu
Default
Range
Description