Westric SW Series, Installation, Operation And Maintenance Manual

Page: 12 / 20

76-5023-05 Page 12 of 20
Operation Modes
D Model
When a temperature value set by the user is reached in the room, the backup unit starts as a support or
reinforcement of the head units until the temperature reach normal values. From this point onwards, only previous
working units will continue to operate.
U Model
Unlike D model, when a temperature value set by the user is reached in the room, the sequencer senses a failure
of the head unit. As a result, disconnects it and turns on the backup one. At the same time it triggers the high
temperature alarm or unit failure. In this model, both units do not work together
Digital Inputs
The sequencer has two digital inputs, E1 and E2, these are used when instantaneous cycle is desired in the event
of a unit failure, for this the unit should be provided with a safety chain and the output of a dry NC contact. The
digital inputs E1, E2 or FF have a light indication (Led), when this on indicates normal state, led off fault.
When a digital input E1 or E2 (unit failure 1, or 2) opens the sequencer cycles, turning on the unit that was in
backup, in this case the alarm for high temperature (F) that makes cycle or turn on the backup unit, is without
effect.
The E1, E2 unit digital input failure must be reset manually.
Resetting Alarms
M Model
Alarms are still on and must be reset manually even if the cause that originated them has been normalized.
A Model
The alarms are automatically reset when the cause is normalized.
Ventilation
S Model
The head unit fan are always on.
General characteristics

Operation control of two cool or cool/heat units.

Digital display indication of ambient temperature, parameter programming, and failures.

Keyboard for programming of parameters.

Programmable room temperature control

Access code for changing parameters

Hourly cycling of the unit operation programmable by keyboard and display from 1 to 7 days.

Alarm output through dry contact due to: high temperature, temperature sensor failure, power supply
anomalies, emergency stop (fire, phase failure, etc.), opening of digital inputs of equipment 1 or 2.

High temperature alarm delay programmable from 0 to 60 minutes.

Automatic start after a power failure