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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
45/84
5.2.2.3 Keypad Enable
The Keypad enable setpoint is not accessible by user password level. If it is set to
“Disable”, contact your local
maintenance service to check if it can be changed to Enable.
5.2.2.1 BMS Enable
The last enable signal is coming through the high level interface, that is from a Building Management System.
The unit can be enabled/disabled from a BMS connected to the UC using a communication protocol. In order
to control the unit over the network, the Control Source setpoint must be turned in “Network” (default is Local) and
Network En Sp must be “Enable”(4.2.2). If disabled, check with your BAS company how the chiller is operated.
5.2.3
Unit Start sequence
As soon as the unit is ready to start and then its status turns to Auto, begins the main steps indicated in the
following simplified flowchart:
5.2.4
Circuit Status
One of the texts strings listed in the table below will inform, on the HMI, about the Circuit Status.
Is there any compressor available?
Start the Pump
Is Flow established?
Start Lead compressor
Start Lag compressor
Thermostat Capacity control
Is more capacity needed?
N
N
N