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Replacement of Drayton Theta ll ES4 Optimiser Controller by S-E Satchwell SVT Optimiser Controller due to obsolescence.

Issue

Drayton Theta ll ES4 Optimiser Controller requires replacement.

Environment

Stand alone discreet Drayton Optimiser Controller :- 

Theta ll ES4

Cause

Obsolescence of Drayton Theta ll ES4 Optimiser Controller.

Resolution

Please note that the Satchwell SVT controller is no longer available, and that the only possible replacement is the DC1400. Please refer to the following Lessons Learned article  for more details. Click Here

Replace Drayton Theta ll ES4 Optimiser Controller with S-E Satchwell SVT Optimiser Controller. 

N.B. 

Two models of the S-E Satchwell SVT Optimiser Controller are available :- 

SVT 4201 with Analogue Timeswitch 

SVT 4251 with Digital Timeswitch,

Details of the S-E Satchwell SVT Optimiser Controllers may be viewed here.

It should also be noted that the associated Drayton Theta ll ES4 Optimiser Controller Sensors are obsolete. 

These Sensors are not compatible with the S-E Satchwell SVT Optimiser Controllers and must therefore be replaced. 

Unlike the Drayton Theta ll ES4 Optimiser Controller, which requires the installation of both an Outside Air Temperature Sensor and an Inside Air Temperature Sensor, the S-E Satchwell SVT Optimiser Controllers require the installation of a Inside Air Temperature Sensor only. 

A S-E STR 614 Inside Air Temperature Sensor is packed with the S-E Satchwell SVT Optimiser Controller when supplied new :-  

Details of the STR 614 Room Temperature Sensor may be viewed here.

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