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Air and Water cooled inverter chillers and heat pump
D-EOMZC00105-17EN
Operation Manual
44/84
EWAD TZ - EWAD TZ B -EWWD VZ
Air and Water cooled inverter chillers and
heat pump
Overall Status
Status text
Description
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.
Noise Reduction
Unit is running with the Quiet Mode activated. Active setpoint may differ from what has been
set as cooling setpoint.
Max Pulldn
Unit thermostat control is limiting the unit capacity because the water temperature is
dropping at a rate that could exceed the active setpoint.
Pumpdn
Unit is shutting down.
5.2.2
Prepare the unit to start
The unit starts only if all the enable setpoints/signals are active:
Unit Switch Enable (signal) = Enable
Keypad Enable (setpoint) = Enable
BMS Enable (setpoint) = Enable
5.2.2.1 Unit Switch Enable (A/C units only)
Each unit is equipped with a Main selector installed outside the front panel of the unit switchbox. As shown in
the pictures below, for TZ and TZ B units three different positions can be selected: Local, Disable, Remote:
Local
With the Q0 switch in this position the unit is enabled. Pump will start if all other enable signals are
set to enable and at least one compressor is available to run
Disable
With the Q0 switch in this position the unit is disabled. Pump will not start in normal operational
condition. Compressor are kept disabled independently from the status of the individual enable
switches.
Remote
With the Q0 switch in this position the unit can be enabled using the additional connections available
on the connection terminals. A closed loop will identify an enable signal, this can come from a
remote switch or a timer by example.
5.2.2.2 Unit Switch Enable (W/C units only)
Each unit is equipped with a Main selector installed outside the front panel of the unit switchbox. As shown in
the pictures below, for VZ units, two different positions can be selected: Local, Disable:
Local
With the Q0 switch in this position the unit is enabled. Pump will start if all other enable signals are
set to enable and at least one compressor is available to run
Disable
With the Q0 switch in this position the unit is disabled. Pump will not start in normal operational
condition. Compressor are kept disabled independently from the status of the individual enable
switches.