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
43/84
5.1.6
Date/Time
5.1.6.1 Date,Time and UTC Settings
See 4.2.5.
5.1.6.2 Quiet Mode Scheduling (A/C units only)
The Quiet Mode can be used to reduce chiller noise in certain hours of the day when noise reduction is more
important than cooling operation, like for example in night time. When Quiet Mode is activated, the LWT
setpoint is increased by the maximum setpoint reset (MR) described in the chapter “Setpoint Reset”, thus
forcing a capacity limitation to the unit without losing control on chilled water temperature. Also, condenser
temperature target is increased by a value set in “QM Cond Offset”. In this way condenser fans are forced to
reduce speed without losing control on condensation. Quiet mode is timer enabled.
The Quiet Mode may affect negatively chiller efficiency due to the increased condenser setpoint
Parameter
Default
Range
Quiet Mode
Disable
Disable,
Enable
QM Start Hr (QMS)
21h
0…24h
QM Start Min
0min
0...60min
QM End Hr (QME)
6h
0…24h
QM End Min
0min
0…60min
QM Cond Offset
(CO)
5°C
0…10°C
5.1.7
Scheduler
Unit On/Off can be managed automatically through the function Time Scheduler enabled when the parameter
Unit Enable is set to Scheduler 0. For each day of the week user can define six time slots and choose for each
time slot one of following mode:
Parameter
Description
Off
Unit Off
On Setpoint 1
Unit On and Cool LWT 1 is the active setpoint
On Setpoint 2
Unit On and Cool LWT 2 is the active setpoint
5.2 Unit/Circuit Start-up
In this section, starting and stopping sequence of the unit will be described. status will be briefly described to
allow a better understanding of what is going on into the chiller control.
5.2.1
Unit Status
One of the texts strings listed in the table below will inform, on the HMI, about the Unit Status.
Overall Status
Status text
Description
Off:
Keypad Disable
The Unit has been disabled by keypad. Check with your local maintenance if it can be
enabled.
Loc/Rem Switch
The Local/Remote enable switch is set to disable. Turn it to Local to enable the unit to start
its starting sequence.
BAS Disable
Unit is disabled by BAS/BMS system. Check with the BAS company how to start the unit.
Master Disable
Unit is disabled by the Master Slave function
Scheduler Disabled
Unit is disabled by the time scheduler.
Unit Alarm
A unit alarm is active. Check the alarm list to see what is the active alarm inhibiting the unit
to start and check if the alarm can be cleared. Refer to section 6. before proceeding.
0
QME
Evap
T
LWT SP
LWT SP + MR
QMS
time
CP SP
CP SP + CO
Cond Press
