User`s guide

Page 12
Controlling DHW temperature
The cylinder temperature is controlled via an NTC2
sensor.
For safety reasons the heat pump controller also checks
for continuity from the DHW thermostat. The temperature
regulation thermostat and high limit stat are wired in
series. To keep the contacts closed on the regulation stat
the dial must be set to maximum. The contacts on the
high limit stat will remain closed during normal operation.
If the heat pump does not detect continuity across both
the regulation stat and high limit stat an H91 error will
occur.
A label similar to that shown in Figure 13 should be
supplied by the installer and fixed on the cylinder to let
the user know.
Figure 13: Notice to be supplied by the installer and fixed
next to cylinder thermostat
TEMPERTURE ADJUSTMENT
The temperature of the hot water in this
cylinder is set using the wall mounted heat
pump controller. The setting shown on this
thermostat does not affect the hot water
temperature.
For normal operation the dial should be
set to the maximum position.
The thermostat on the cylinder should
not be modified to disable the regulation
stat or high limit stat.