Using The Hw And Ch Sliders; Advance/Extend Buttons; Programmer Memory Backup - Potterton EP2 Customer's Manual

a

Using the HW and CH Sliders

The HW and CH sliders are located under the flap in the middle of the programmer. During Normal
Operation, by moving these sliders you can select how you wish your system to work:
OFF Ignores the time periods set in memory
TIMED Allows the CH or HW to run to the times you have set in the programme memory
ONCE Allows your CH or HW to run once a day, from the first ON time to the last OFF time
ON Will turn the CH or HW on continuously 24 hours a day
The channel indicators to the right of the HW/CH sliders will illuminate when the relevant channel is
ON and extinguish when the channel is OFF.
m
Using the ADVANCE buttons
The ADV buttons allow you to go forward to the next ON or OFF time, when the sliders are in TIMED
or ONCE position. The button on the HW channel advances HW, and the CH button advances CH.
The status of either channel is shown by the status indicators to the right of the sliders.
To advance the programme, simply press the relevant ADV button and the CH or HW will go OFF (IF
ON) or ON (IF OFF); press again to return to original status.
Using the EXTEND buttons
□
The EXT buttons allow you to extend a current ON period or switch your HW or CH on, during an
OFF period, for 1, 2 or 3 hours. If you press the button a fourth time, the programmer will run at the
original ON/OFF times.
NOTE: Using either the EXT or ADV buttons will not affect the ON/OFF times set in the programmers
memory, the change is only temporary.
Operation notes
It does take time for the boiler to produce the desired heating and hot water temperatures, so set the
programmer switch ON, for example, half an hour earlier.
Other controls in your system (such as room, boiler and cylinder thermostats) may affect the switch­
ing of your boiler. So although the indicator shows that the central heating is ON, the boiler itself
could be OFF. (Ask your installer to explain how they work).

Programmer memory backup

If the electricity fails or is switched off, the display will go blank and the programmer will maintain the
set times and the clock for 24 hours. After that time, you may have to reset the clock and ON/OFF
times.
NOTE: During the time that the electricity is off, any electrical items e.g. Boiler, pumps etc, will not
operate.
H Guide to operational problems
W arning: DISCONNECT THE MAINS SUPPLY BEFORE THE PROGRAMMER IS REMOVED
Ensure ALL supplies to the programmer are fused to 3 Amps. Internal damage can occur if not
correctly protected (5 AMP & 13 Amp fuses are NOT suitable).
3