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6.8.8
External connections
NOTICE
Material damage due to incorrect connection!
The electrical components may become damaged if connected to the
wrong voltage or current.
▶ Only make connections that are adapted for 5 V and 1 mA to the
external connections of the indoor unit.
▶ If coupling relays are required, only use relays with gold contacts.
The external inputs I1 and I4 can be used for remote control of individual
control unit functions.
Functions which are activated via the external inputs are described in the
instructions for the control unit.
The external input is either connected to a manual switch or a control
device with a 5 V relay output.
7
Commissioning
7.1
Filling and venting the heating system
NOTICE
The system will be damaged if it is turned on without water.
The system may be damaged if it is turned on without water.
▶ Fill the DHW cylinder and heating system before turning on the
heating system, and establish the correct pressure.
Hydraulic diagram of the indoor unit Fig. 44, page 35
Filling the heating system
▶ Interrupt the power supply to the outdoor unit, indoor unit and
external booster heater.
▶ Activate automatic air vent valve by unscrewing the screw a couple of
turns to loosen it, without completely removing it.
▶ Open all valves in the heating system.
▶ If installed, activate the other automatic air vent valves in the heating
system.
▶ Ensure flow rate at the particulate filter, open ball valve if required.
▶ Slowly fill the heating system via an external booster heater.
Operating pressure
1.2-1.5 bar
Minimum charge pressure. Fill the system to a
pressure of 0.2–0.5 bar above the pre-charge
pressure of the expansion vessel when the heating
system is cold.
3 bar
Maximum charge pressure at maximum heating
water temperature: must not be exceeded (the
pressure relief valve will open).
Table 9 Operating pressure
▶ If the pressure does not remain constant, check whether the heating
system and the expansion vessel are tight.
▶ Reconnect the power supply to the outdoor unit, indoor unit and
external booster heater.
Compress Hybrid 3400i AW – 6721861825 (2023/08)
Venting the heating system
▶ Select the menu item Activating function checks in the service
menu of the indoor unit to start the ventilation program.
Alternative:
▶ Select the menu item DHW circ. pump: ON/OFF in the service menu.
▶ Switch the DHW circulation pump of the indoor unit on and off
cyclically with a speed of 100%.
▶ If installed, switch other DHW circulation pumps in the heating
system cyclically on and off.
▶ Check the operating pressure and top up water if necessary until the
required pressure in the heating system has been reached.
▶ Vent the system via other air vent valves of the heating system (e.g.
radiators).
▶ Repeat steps 1 to 4 until the heating system has been vented.
▶ Clean the particulate filter.
7.2
Operation without outdoor unit (Stand-alone mode
and chimney sweep mode)
The indoor unit can be brought into operation without the outdoor unit
connected, for example when the outdoor unit is installed later. This is
referred to as Stand-alone mode or stand-alone operation.
In Stand-alone mode, the indoor unit uses the external booster heater
exclusively for heating and for DHW heating.
If the indoor unit and the heating system are filled before the outdoor unit
is connected, circulation of the heat transfer medium must be ensured:
▶ Connect the heat transfer medium input and output.
▶ Open all shut-off valves in the heat transfer medium circuit.
Commissioning in individual operation:
▶ In the service menu Heat pump, set the option Stand-alone mode
(Control unit manual).
The setting Stand-alone mode is also required for chimney sweep
mode!
▶ In the service menu Heat pump, set the option Stand-alone mode
(Control unit manual).
▶ Once the work in chimney sweep mode is complete, reset the setting.
7.3
Function test
7.3.1
Operating temperatures
The operating temperature check must be performed in heating mode
(not in DHW or cooling mode).
For optimum system operation, the flow rate in the heat pump and
heating system must be monitored. This check should be performed
after 10 minutes heat pump operating time and during high compressor
heating output.
The temperature differential for the heat pump must be set for the
different heating systems.
▶ With underfloor heating system: set a temperature difference of 5 K.
▶ With radiators: set a temperature difference of 8 K.
These settings are optimal for the heat pump.
Check the temperature differential at high compressor heating output:
▶ Open the diagnosis menu.
▶ Select Monitored values.
▶ Select Heat pump.
Commissioning
27
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