16
Dealing with comfort disruption
Operating mode “Add. heat only”
In the event of malfunctions that cause a low indoor temperature,
you can normally activate “Add. heat only” in indoor unit, which
means that heating only occurs with the immersion heater.
Activate the mode by holding in the operating mode button
for 7 seconds.
Note that this is only a temporary solution, as heating with the
immersion heater does not make any savings.
Emergency mode
Emergency mode is activated by setting the switch to “ ”.
It is used when the control system and thereby operating mode
“Add. heat only” do not function as they should. Emergency
mode is activated by setting switch (SF1) to “ ”.
The following applies in emergency mode:
■ The front panel is not lit and the control computer in
indoor unit is not connected.
■ Outdoor unit is off and only the circulation pump and
immersion heater in indoor unit are active.
■ An electrical step of 4 kW is connected. The immersion
heater is controlled by a separate thermostat (BT30).
■ The automatic heating control system is not operational, so
manual shunt operation is required. Call installer.
The phenomena mentioned below is not malfunction.
The air conditioning system
sounds as if water is
draining from it.
Sounds of rustling or gurgling may be heard when the operation is started, when the compressor is
activated/deactivated during operation, or when the operation is stopped. These are the sounds of the
refrigerant flowing through the system.
Sounds of rustling or
gurgling may be heard from
a stopped indoor unit.
These sounds can be heard when the air conditioning system is performing automatic control.
The air conditioning system
cannot start operating again
immediately after stopping.
Outdoor unit does not restart during the first 3 minutes after stopping operation. This is because a
circuit for protecting the compressor is activated (the fan is operating during this period).
The outdoor unit discharges
water or steam during
heating operation.
Water or steam is discharge during defrosting operation which removes frost built up on the surface of
the heat exchanger in the outdoor unit in heating mode.
The outdoor unit fan is not
running even when the
system is in operation.
The fan speed is automatically controlled according to the ambient temperature. It may be stopped in
high ambient temperature in case of heating, and in low ambient temperature in case of cooling. Also,
the fan is stopped during defrosting operation.
REQUESTS
The fan will suddenly begin to operate even if it is stopped. Do not insert finger and/or stick.
Hissing sounds are heard
when the operation is
stopped or during defrost
operation.
These sounds are generated when the refrigerant valve inside the air conditioning system is activated.
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