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Parameter
Default
Range
Max Reset (MR)
5.0°C
0.0°C
10.0°C
Start Reset DT (SR
T)
5.0°C
0.0°C
10.0°C
Active Setpoint (AS)
LWT Target (LWT SP)
Cool/Ice LWT
5.1.4.6
Soft Load
Soft Loading is a configurable function used to ramp up the unit capacity over a given time period, usually used to influence
building electrical demand by gradually loading the unit. The setpoints that control this function are:
Parameter
Description
Softload En
Enables soft loading
Softload Ramp
Duration of the soft load ramp
Starting Cap
Begin capacity limit. Unit will increase capacity from this value to 100% over the time specified by the Softload
Ramp setpoint.
Scheduler
Unit On/Off can be managed automatically through the function Time Scheduler enabled when the parameter Unit Enable
is set to Scheduler. 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 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.
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 3.1 before proceeding.
Test Mode
Unit mode set to Test. This mode is activated to check operability of onboard actuators and
sensors. Check with the local maintenance if the Mode can be reverted to the one
compatible with unit application (View/Set Unit
– Set-Up – Available Modes).
All Cir Disabled
No circuit is available to run. All circuits can be disabled by their individual enable switch
or can be disabled by a component safety condition active or can be disabled by keypad
or can be all in alarms. Check the individual circuit status for further details.
Ice Mode Tmr
This status can be shown only if the unit can work in Ice Mode. The unit is off because the
Ice setpoint has been satisfied. Unit will remain off until the Ice Timer has expired.
OAT Lockout
(A/C units only)
The unit cannot run because the Oustide Air Temperature is below the limit foreseen for
the condenser temperature control system installed in this Unit. If the Unit has to run
anyway check with your local maintenance how to proceed.
Auto
Unit is in Auto control. The pump is running and at least one compressor is running.
Auto:
Evap Recirc
Unit is running the evaporator pump to equalize the water temperature in the evaporator.
Wait For Flow
Unit pump is running but the flow signal still indicate a lack of flow through the evaporator.
Wait For Load
Unit is in standby because the thermostat control satisfied the active setpoint.
Unit Cap Limit
Demand limit has been hit. Unit capacity will not further increase.
Current Limit
Maximum current has been hit. Unit capacity will not further increase.
0
SR
T
Evap
T
AS
LWT SP
MR
LWT SP + MR
