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.