Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
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EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Fan settings are set to have a good and stable control of the condenser saturated temperature in almost all
operating conditions.
Improper modification of the default settings could affect performances and generate circuit alarms. This action
must be performed only by trained persons.
4.3.4
EXV
This page resumes all the relevant information about the status of the EXV logic.
Setpoint/Sub-Menu
Default
Range
Description
TZ / TZ B
VZ
EXV State=
Closed
Closed
Closed, Pressure, Superheat
EXV State
Suction SH=
6.0°C
6.0°C
Suction Superheat
Superht Target=
6.0°C
6.0°C
Suction Superheat setpoint
Press Target
N/A
-
Evap Pressure=
220kPa
220kPa
Evaporating Pressure
EXV Position=
50.0%
50.0%
Expansion valve opening
4.3.5
Economizer (A/C only)
This page resumes all the relevant information about the data and the status of the economizer
Setpoint/Sub-Menu
Default
Range
Description
Economizer=
With
Without, With
Setting to enable or disable the Economizer
Econ State=
Regulation
Off,Preopen, SSH, Liq Inj
Economizer State
Econ EXV Pos=
0%
Economizer EXV opening
Econ SH=
6.0°C
Economizer Superheat
Econ SH Tar=
6.0°C
Actual calculated Economizer superheat target
Min EcoSH Tar=
6.0°C
Minimum Economizer superheat target
Econ Press=
500kPa
Economizer Pressure
Econ Sat Temp=
24°C
Economizer Saturated Temperature
Econ Temp=
30°C
Economizer Temperature
Econ En Cap=
1200rpm
Minimum compressor speed to enable Economizer
4.3.6
Settings (A/C units only)
This page resumes the settings of the circuit.
Setpoint/Sub-Menu
Default
Range
Description
Pumpdn Press=
100kPa
70…280kPa
Pumpdown pressure limit
Pumpdn Time=
120s
0…180s
Pumpdown timeout limit
Service Pumpdn=
Off
Off,On
Activation of the function service pumpdown
Liq Inject Act=
90°C
80…100°C
Discharge Temperature limit to enable the liquid injection
Var VR Act PR=
3.8
1.5…5
Pressure Ratio threshold to activate VR3 slide position
4.3.7
Variable VR
This page contains present data of variable VR control.
Setpoint/Sub-Menu
Description
Press Ratio
Present value of compressor pressure ratio
VR Position
Present position of VR slide
4.4 Active Setpoint
This link jumps to the page “Tmp Setpoint”. This page resumes all chiller water temperature setpoints (limits
and active setpoint will depend on the operating mode selected).
Setpoint/Sub-Menu
Default
Range
Description
TZ/TZ B
VZ
Cool LWT 1=
7.0°C
7.0°C
4.0…15.0°C (cool mode)
-
8.0…15.0°C (cool w/ glycol mode)
Primary cooling setpoint
Cool LWT 2=
7.0°C
7.0°C
4.0…15.0°C (cool mode)
-
8.0…15.0°C (cool w/ glycol mode)
Secondary cooling setpoint (see 3.6.3)
Ice LWT=
-4.0°C
-4.0°C
-
8.0…4.0°C
Ice setpoint (ice banking with on/off mode)
Max LWT=
15.0°C
15.0°C
10.0…20.0°C
High limit for Cool LWT1 and Cool LWT2
Min LWT=
-8.0°C
-8.0°C
-
15.0…-8.0°C
Low limit for Cool LWT1 and Cool LWT2
HR EWT Stp=
40.0°C
N/A
30.0…50.0°C
Heat Recovery Entering Water Setpoint
HR EWT Dif=
2.0°C
N/A
1.0…10.0°C
Heat Recovery Water Temperature differential