Settings / Maintenance
9
FIGHTER 1240
To be able to produce heat when the collector circuit is
disconnected, or during servicing, the heat pump can
be set to standby mode, in which case heating is pro-
duced only by the immersion heater. Hot water is not
produced in standby mode. The compressor and col-
lector system are then shutoff and only the heat medi-
um pump and the immersion heater are active. The
temperature is controlled by the thermostat (3). To
select standby mode, set the switch (8) to “ ”.
Electrical step 2 is connected in standby mode.
Standby mode
When there is a demand for hot water, the heat pump
gives this priority and devotes its entire output to
water heating. No room heat is produced in this
mode. Maximum time for hot water charging is
adjustable using menu 1.3. Heating is then produced
for the remainder of the time, which is adjustable from
menu 1.2, before any further hot water charging can
take place.
If the electrical module is connected for heat produc-
tion before hot water charging, one
electrical stage remains operative during hot water
operation. Hot water charging starts when the hot
water sensor has fallen to the set start temperature
(25 — 55 °C), adjustable on menu 1.4. Hot water
charging stops when the water temperature on the
hot water sensor (88) has reached
(30 — 60 °C), adjustable on menu 1.5. Charging is
also possible when the heat pump has reached its
stop level for heating mode at the same time as less
than 2 °C remains to the hot water start. The purpose
of this is to minimise the number of starts.
For occasional higher demand for hot water, the Extra
hot water function can be used to raise the tempera-
ture to about 70 °C for 3 – 24 hours (press the Extra
hot water button once). When the electrical module is
connected for extra hot water the compressor stops.
The value when the compressor stops and the immer-
sion heater kicks in is adjustable between 50 – 60 °C
in menu 1.7.
The supply of heat to the house is regulated in accor-
dance with the chosen setting of the regulating curve
(curve slope and offset). After adjustment, the correct
amount of heat for the outside temperature is sup-
plied. The heat pump’s flow temperature (menu 2.0)
will hover around the theoretical required value (the
value in brackets on the display). For subnormal tem-
peratures the control system calculates a heating
deficit in the form of degree-minutes, which means
that heating production is accelerated. The larger the
subnormal temperature, the greater the heat produc-
tion.
There are four stages to heat production, one for the
heat pump and three for the electrical module.
Heating
Hot water
3
8
Safety valves
■ The safety valves for the heating system and hot
water heater may release a small amount of
water in the event of temperature changes.
■ The overflow water pipes from the safety valves
must be uninhibited and be visible.
■ The safety valves must be inspected regularly to
prevent clogging. This is normally done by tur-
ning the safety valve knob anti-clockwise. The
water should then flow through the safety valve.
The safety valve must be replaced if this does
not happen.
The appearance and location of the safety valves dif-
fer between different installations. Contact your instal-
ler for information.
Maintenance
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