Issue 1.0 July 2017 TB121 Applies to models: Powrtrol w w w. p ow rma ti c.co.u k Instruction for replacing a spares Diehl Digital Clock. HEATING // VENTILATION // AIR CONDITIONING General Information The Powrmatic Powrtrol utilises a simple easy to operate digital timer. The original Diehl 884 timer has been replaced with a Diehl Variotime 16124 which utilises the same fixing, wiring connections and fig.1 Powrmatic Powrtrol programming configuration as its predecessor. This bulletin describes both the installation and programming procedure required to function the timer. fig.2 Diehl Digital Timer Tools required Small flat head screwdriver Pozi head screwdriver Thin Nosed Pliers 1 x Digital timer # 143000408 including clear cover and two fixing clips. Technical bulletin (TB121) page no. 2 of 4 Replacement Diehl Digital Clock Doc ref: TB121 issue1.0 Jul 2017. Procedure WARNING: Always switch off and disconnect electricity supply before carrying out any servicing or replacement of failed components. Replacement of existing timer. 1. On Powrtrol units, remove the two fixing screws and open the controller door. 2. Gently remove the four cables connected to the existing timer. 3. Using a small flat screwdriver, release the two side clips and withdraw. 6. Refit cables to timer as per diagram below. t1 t2 t3 t5 4. Replace new timer in same position. 5. Push the side clips into position ensuring a tight fit with controller door. Programming time switch Timer OFF CONSTANT Timer operating to SET PROGRAMME Set CURRENT TIME Normal operating mode Set PROGRAMME Timer ON CONSTANT DAY of the week indicator Timer ON indicator TIME Programme entry number Access to the Programme Dial for Time Setting To gain access to the programme dial for timer setting, remove the clear plastic cover. To prepare the module for programming clear the memory by pressing the button marked Setting Day of Week and Time of Day. • Select CLOCK • Set current DAY by pressing button (a black triangle indicates the day Monday=1; Sunday=7). Select PROGRAMME (8 on & 8 off) Select SOFT OVERRIDE Select individual group of DAYS Select MINUTES RESET Select HOURS Replacement Diehl Digital Clock Doc ref: TB121 issue1.0 Jul 2017. • Set the current time of day (24hr clock) using buttons. (Rapid selection can be the achieved by continuously holding down for more than 3 seconds. Finally select RUN page no. 3 of 4 Planning a Programme • Continue until programmes are complete. A programme is a pair of ON & OFF settings which will dictate when the heater will switch ON or OFF. Up to 8 ON & OFF settings may be programmed. Odd numbers are programme ‘ON’ and indicated by a symbol, even numbers are programme ‘OFF’. Setting a Programme • Set the first switching ON time - programme buttons. • Set day or group of days using the button. (Individual or multiple days can be programmed by repeated pressing the button.) • Press the button to confirm programme and forward to first OFF time - programme . • Set the first switching OFF time - programme using the buttons. • Set day or group of days using the (this must match the previous ON entry) button. • Press the button to confirm programme and forward to first OFF time - programme . Prog No. Status be deleted by pressing and holding the and buttons together. • Select when all required programme times have been entered. (there is no need to go through all non used programmes). • Select PROGRAMME using the Programmes can be reviewed by pressing button repeatedly. Individual programmes may Day(s) Time The clock and programme settings are now complete. Programme Override Under programming operation, the button will be in the centre position . There are three facilities for override: Constant ON. Select I . The air heater will operate in a constant ON state but dependent on thermostat temperature. . The air heaters will Constant OFF. Select 0 not operate unless in a frost condition. Soft override. Select at any time will change the current status to it’s opposite i.e. On to Off. Timer will revert back to normal operation at the next switching time. Prog No. Status ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF Day(s) Time HEATING DIVISION Hort Bridge Ilminster, Somerset TA19 9PS Tel: 01460 53535 Fax: 01460 52341 Every effort is made to ensure accuracy at time of going to press. However as part of continued product improvement, we reserve the right to alter specification without prior notice. page no. 4 of 4 Replacement Diehl Digital Clock Doc ref: TB121 issue1.0 Jul 2017.