26
Installation and Servicing
SECTION 2 - INSTALLATION
DISPLAY FUNCTIONS - CONT’D
HOT WATER
PREHEAT
OFF
U
fh
P1
ca
U
P7
HOT WATER
PREHEAT
ON
Navigate the Standard menu as displayed on page 26
using the ‘Menu’ button until the ‘Preheat Enable’ screen
is displayed.
Then press + and – buttons together for 3 seconds to
enter service mode.
The display will begin to cycle through the last 3 faults.
(example fault only)
Press the Menu button to progress to the ‘Pump Modulation Setting’ display:
Press +/- to set the pump modulation to either P7 (70%,
modulation enabled) and P1 (modulation disabled).
Press the Menu button to progress to the ‘Valve
Calibration' service mode.
Press +/- to calibrate both DHW & CH valves.
Press the Menu button to progress to the ‘DHW Valve
Replacement’ service mode:
If +/- buttons are pressed the DHW valve will drive fully open for up to 30 minutes. This may
be required if the valve body needs to be replaced.
WARNING: if primary supply is not isolated this service mode will charge the DHW heat
exchanger which could cause a scold risk.
Press the Menu button again to progress to the ‘CH Valve Replacement’ service mode:
If +/- buttons are pressed the CH valve will drive fully open for up to 30 minutes. This may be
required if the valve body needs to be replaced.
WARNING: If the primary supply is not isolated this could result in a hot slug of water building
up in the CH heat exchange which could cause damage to certain heating systems when the
pump is activated.
Press the Menu button again to progress to the ‘CH Maximum Rate’ service mode:
- +/-
- +/-
- -/+
- -/+
2.12.4 SERVICE MODES
INST
ALLA
TION
