Accorroni HPE R32 18, Installation Manual

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59
Symptom 3: Pump is making noise (cavitation)
POSSIBLE CAUSES CORRECTIVE ACTION
There is air in the system. Purge air.
Water pressure at pump
inlet is too low.
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The water pressure must be > 1 bar (water is cold).
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vessel is correct (refer to "9.3
:
ater piping/Checking the water
volume and expansion vessel pre-pressure").
Symptom 4: The water pressure relief valve opens
POSSIBLE CAUSES CORRECTIVE ACTION
The expansion vessel is broken. Replace the expansion vessel.
The filling water pressure
in the installation is
higher than 0.3MPa.
Make sure that the filling water pressure in the installation is about
0.15~0.20MPa (refer to "9.3 : ater piping/Checking the water volume
and expansion vessel pre-pressure").
Symptom 6: Space heating capacity shortage at low outdoor temperatures
Symptom 5: The water pressure relief valve leaks
POSSIBLE CAUSES CORRECTIVE ACTION
Dirt is blocking the water
pressure relief valve
outlet.
Check for correct operation of the pressure relief valve by turning the red
knob on the valve counter clockwise:
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water inlet and outlet shut-off valves first and then contact your
local dealer.
POSSIBLE CAUSES CORRECTIVE ACTION
Backup heater operation
is not activated.
Too much heat pump
capacity is used for
heating domestic hot
water (applies only to
installations with a
domestic hot water tank).
Check that the “t_DHWHP_MAX” and “t_DHWHP_RESTRICT” are
configured appropriately:
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disabled.
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to activate the booster heater for domestic water heating.
Check that the "OTHER HEATING SOURCE/ BACKUP HEATER"is
enabled, see "10.7 Field settings" Check whether or not the thermal
protector of the backup heater has been activated (refer to “Controls
parts for backup heater (IBH) ” ). Check if booster heater is running, the
backup heater and booster heater can’t operate simultaneously.
Symptom 7: Heat mode can’t change to DHW mode immediately
POSSIBLE CAUSES CORRECTIVE ACTION
Volume of tank is too
small and the location of
water temperature probe
not high enough
‡ 6HW³G76´WR °C, and set “t_DHWHP_RESTRICT” to minimum value.
‡ WR °C.
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turn heat pump on is fullfilled, the heat pump will turn on.
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of T5 probe(refer to 2 General information/Domestic hot water
tank).