Technical Bulletin Warm Air

Ref GB/TB/010/0207 Warm Air Fan Control Time Relay
Bulletin updated 19/02/2007

Note: Bulletin to be used in conjunction with the relevant Warm Air Operating and Maintenance Manuals

Replacement Fan Control Relays for UDSA; UDSAV; UDSB-D, UPA, ST-2 series, UC series, T xeries and ST-1 seriesheaters have changed type.

The change involves the replacement of the standard Fan Control Relay with a fully automatic timed version. This will enable a wider tolerance of control over the axial fan by switching the motor between 20 seconds to a minute after the Venter had been energised. The axial fan will switch off one to two minutes after the Venter motor.

This technical bulletin describes in detail the procedure required to complete the replacement of the Fan Control Time Relay and wiring changes.

The information contained in this technical bulletin is designed to aid a qualified or competent service technician.

Factory fitted replacement Fan Control Time Relays on these heaters commenced as from March 2006 or serial number 06 4500080 for UDSA/UPA models and September 2006 or serial number 06 4501428 for ST/UC series. 

Click on link below to follow the step by step instructions.

document added 13/07/06
document modified 19/02/07