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OMNIA M 3.2
Symptom 8: DHW mode can't change to Heat mode immediately
POSSIBLE CAUSES
Heat exchanger for space
heating not big enough
Space heating load is small
Disinfect function is enabled
but without TBH
Manual turn on the FAST
WATER function, after
the hot water meets the
requirements, the heat pump
fails to switch to the air-
conditioning mode in time
when the air conditioner is in
demand
When the ambient
temperature is low, the hot
water is not enough and
the AHS is not operated or
operated late
DHW mode priority
Symptom 9: DHW mode heat pump stop work but setpoint not reached, space heating require heat but unit stay in DHW
mode
POSSIBLE CAUSES
Surface of coil in the tank
not large enough
TBH or AHS not available
13.3 Operation parameter
This menu is for installer or service engineer reviewing the operation parameters.
•
At home page, go to "
">"OPERATION PARAMETER".
•
Press "
". There are nine pages for the operating parameter as following. Press "▼", " " to scroll.
•
Press "►" and " " to check slave units' operation parameter in cascade system. The address code in the upper right
corner will change from "#00" to "#01". "#02" etc. accordingly
IN
22T÷30T
•
Set "t_DHWHP_MAX" to minimum value, the suggested value is 60min.
•
If circulating pump out of unit is not controlled by unit, try to connect it to the unit.
•
Add 3-way valve at the inlet of fan coil to ensure enough water flow.
Normal, no need for heating
•
Disable disinfect function
•
add TBH or AHS for DHW mode
Manual turn off the FAST WATER function
•
Set "T4DHWMIN", the suggested value is ≥ -5"C
•
Set "T4_TBH_ON", the suggested value is ≥ -5'C
If there is AHS or IBH connect to the unit, when the outdoor unit failed, the indoor unit
must run DHW mode till the water temperature reach the setting temperature before
change to heating mode.
The same solution for Symptom 7
Heat pump will stay in DHW mode untill "t_DHWHP_MAX" reached or setpoint is
reached. Add TBH or AHS for DHW mode,TBH and AHS should be controlled by the
unit.
Cod. 3QE47660 - Rev. 00 - 02/2022
CORRECTIVE ACTION
CORRECTIVE ACTION
141
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