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Replacement of Satchwell CZU Mk 2 Zonemaster Controller by S-E Satchwell CZU Mk 4 Zonemaster Controller due to obsolescence.

Issue

Satchwell CZU Mk2 Zonemaster Controller requires replacement.

Environment

  • Stand alone Fan Coil Unit Temperature Controller.
  • Satchwell CZU Mk 2 Zonemaster Controller.
  • CZU 2201
  • CZU 2202
  • CZU 2203

Cause

Obsolescence of Satchwell CZU Mk 2 Zonemaster Controller.

Resolution

Replacement of Satchwell CZU Mk 2 Zonemaster Controller with S-E Satchwell CZU Mk 4 Zonemaster Controller.

The CZU 4201 may be used to replace the following CZU Mk 2 Controllers :-

CZU 2201, CZU 2202, CZU 2203

N. B.

CZU 2201 Controllers provided an additional -9 to +9 V d.c. output enabling connection to peripherals such as the Satchwell NSU 1401 Night Set-back Override Unit, TSU 1402 Two Step Auxiliary Unit and SSU 1403 Signal Selector Unit.

CZU 2202 and CZU 2203 Controllers provided an additional -0.5 to +9 or -9 to +0.5 V d.c. output enabling connection to the Satchwell NSU 1401 Night Set-back Override Unit. 

Additional outputs are not provided on the CZU 4201 Controller and in those applications where these are required then it will be necessary to consider an alternative Controller to the CZU 4201.

Details of the CZU 4201 may be viewed here.

A remote Satchwell Adjustable Room Temperature Sensor such as the DRT 3451, or a remote Satchwell Duct Temperature Sensor from the DDU range of Sensors may have been installed and connected to the Controller.

Any existing remote Satchwell Temperature Sensors may be retained for connection to the CZU 4201.

Should the remote Satchwell Adjustable Room Temperature Sensor require replacement then this may be replaced by an S E STR 612 Adjustable Room Temperature Sensor.

Details of the STR 612 may be viewed here.

Should the remote Satchwell Duct Temperature Sensor require replacement then this may be replaced by an S E STD 670 Duct Temperature Sensor.

Details of the STD 670 may be viewed here.

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