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Air and Water cooled inverter chillers and heat pump
EWAD TZ - EWAD TZ B - EWWD VZ
Air and Water cooled inverter chillers
and heat pump
D-EOMZC00105-17EN
Operation Manual
25/84
Setpoint/Sub-Menu
Default
Range
Description
Complete
On/Off + Capacity control
Control Tmp=
Leaving
Entering
Leaving
Parameter to define the controlled temperature
Entering - Thermoregulations is based on the Average Entering Water Temperature
(AEWT)
Leaving - Thermoregulation is based on the Common Leaving Water Temperature
(CLWT)
4.2.7.3
Thermostat Ctrl
This page resumes all thermostat control parameter of Master Slave.
Setpoint/Sub-Menu
Default
Range
Description
Stage Up DT=
2.7°C
0.5…5.0°C
Offset respect the active setpoint for the unit startup.
Stage Dn DT =
1.5°C
0.5…5.0°C
Offset respect the active setpoint for the unit shutdown.
Dead Band =
0.2
0.1 - Min(Stage UP DT, Stage Dn
DT)
Dead Band respect the active setpoint within which the
load/unload command are no longer generated
Threshold=
60%
30...100%
Threshold of load that have to reach all units running before
start of a new chiller
Stage Up Time=
5min
0min…20min
Minimum time between the start of two chillers
Stage Dn Time=
5min
0min…20min
Minim time between the stop of two chillers
Min Evap Tmp=
4.0
-
18…30°C
Minimum Evaporator leaving water temperature
4.2.7.4
Timers
Setpoint/Sub-Menu
Default
Range
Description
Stage Up Timer=
-
-
Current delay for new chiller stage up
Stage Dn Timer=
-
-
Current delay for new chiller stage down
Clear Timers=
Off
Off
Reset
This command, visible only with service password, can be used to reset the Stage Up/Dn
Timer.
4.2.7.5
Standby Chiller
This menu allows to configure the standby chiller
Setpoint/Sub-Menu
Default
Range
Description
Standby Chiller=
No
No, Auto, Master, Slave 1, Slave 2,
Slave 3
Standby chiller selection
Cycling Type=
Time
Run Hours, Sequence
Cycling type of standby chiller if previous parameter Standby
Chiller is set as Auto
Interval Time=
7 Days
1…365
Define the interval time (expressed in day) for the cycling of
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
Tmp Cmp=
No
No,Yes
Enabling of Temperature Compensation function
Tmp Comp Time=
120 min
0…600
Time constant of Temperature Compensation function
Standby Reset=
Off
Off, Reset
Parameter to reset standby chiller cycling timer
4.2.8
Rapid Restart
This page shows if the function Rapid Restart is enabled by external contact and it allows to define the
maximum black out time in order to recover quickly the unit load.
Setpoint/Sub-Menu
Default
Range
Description
Rapid Restart=
Disable
Enable, Disable
Feature enable if Rapid Restart is installed
Pwr Off Time=
60s
-
Maximum black out time to enable Rapid Restart
4.2.9
Date/Time
This page will allow to adjust the time and date in the UC. This time and date will be used in the alarm log and
to enable and disable the Quiet Mode. Additionally it’s also possible to set the starting and ending date for the
DayLight Saving time (DLS) if used. Quiet Mode is a feature that is used to reduce the chiller noise. This is
done by applying the maximum setpoint reset to the cooling setpoint and increasing the condenser temperature
target by an adjustable offset.