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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
32/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
4.9 Unit Enable (A/C Units only)
This page allows to enable or disable unit and circuits. For the unit it also possible enable the operation with
time scheduler, while for circuit it is possible to enable the test mode.
Setpoint/Sub-Menu
Default
Range
Description
Unit
Enable
Enable, Disable, Scheduler
Unit enable command
Circuit #1
Enable
Enable, Disable, Test
Circuit #1 enable command
Circuit #2
Enable
Enable, Disable, Test
Circuit #2 enable command
4.10 Timers
This page indicates the remaining cycle timers for each circuit and the remaining staging timers. When the
cycle timers are active any new start of a compressor is inhibited.
Setpoint/Sub-Menu
Default
Range
Description
C1 Cycle Tm Left=
0s
-
Circuit 1 cycle timer
C2 Cycle Tm Left=
0s
-
Circuit 2 cycle timer
C1 Cycle Tmr Clr=
Off
Off, On
Clear circuit 1 cycle timer
C2 Cycle Tmr Clr=
Off
Off, On
Clear circuit 2 cycle timer
Stg Up Dly Rem=
0s
-
Remaining delay to next compressor start
Stg Dn Dly Rem=
0s
-
Remaining delay to next compressor stop
Clr Stg Delays=
Off
Off, On
Clear remaining delays to next compressor start/stop
Ice Cycle Rem=
0min
-
Remaining Ice cycle delay
Clr Ice Dly
Off
Off, On
Clear remaining delay for Ice mode
4.11 Alarms
This link jumps to the same page accessible with the Bell button. Each of the items represents a link to a page
with different information. The information shown depends on the abnormal operating condition that caused
the activation of unit, circuit or compressor safeties. A detailed description of the alarms and how to handle will
be discussed in the section 6.
Setpoint/Sub-Menu
Default
Description
Alarm Active
List of the active alarms
Alarm Log
History of all the alarms and acknowledges
Event Log
List of the events
Alarm Snapshot
List of alarm snapshots with all the relevant data recorded at time the alarm occurred.
4.12 Commission Unit
Setpoint/Sub-Menu
Default
Range
Description
Alarms Limits
-
Submenu for alarm limits definition
Calibrate Sensors
-
Submenus for Unit and Circuit sensor calibration
Manual Control
-
Submenus for Unit and Circuit manual control
Scheduled Maintenance
-
Submenu for scheduled maintenance
4.12.1 Alarm Limits
This page contains all alarm limits, including low pressure alarm prevention thresholds. In order to ensure
proper operation they have to be set manually according to the specific application.
Setpoint/Sub-Menu
Default
Range
Description
TZ / TZ B
VZ
Low Press Hold=
180.0kPa
200.0kPa
0…310.0 kPa
Low pressure safety limit to stop capacity increase
Low Press Unld=
160.0kPa
190.0kPa
0…250.0 kPa
Low pressure alarm prevention
Hi Oil Pr Dly=
30s
30s
10…180s
Delay for the High oil pressure difference alarm
Hi Oil Pr Diff=
250kPa
250kPa
0.0…415.0kPa Pressure drop for a clogged filter
Hi Disch Temp=
110.0°C
110.0°C
Maximum discharge temperature limit
Hi Cond Pr Dly=
5s
5s
Delay on the High pressure alarm from transducer
Lo Pr Ratio Dly=
90s
90s
Delay on the low pressure ratio alarm
OAT Lockout=
4.0°C
4.0°C
Air temperature operational limit
Strt Time Lim=
60s
N/A
Time limit for the low ambient start
Evap Flw Proof=
15s
N/A
Flow proof delay
Evp Rec Timeout=
3min
N/A
Recirculating timeout before the alarm is raised
Evap Water Frz=
2.2°C
2.2°C
-
18.0…6.0 °C
Freeze protection limit
Water Flw Proof=
N/A
15s
5…15s
Flow proof delay
Water Rec Timeout=
N/A
3min
1…10min
Recirculating timeout before the alarm is raised