Bosch Compress Hybrid 3400i AW User Manual

Maintenance
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Compress Hybrid 3400i AW – 6721861825 (2023/08)
8.6 Cooling mode
NOTICE
Damage to the indoor unit due to condensation
The indoor unit with mixer is not designed to be used in cooling mode
below the dew point.
▶ Only use the indoor unit in cooling mode above the dew point.
▶ Set the minimum set flow temperature to at least 17 °C.
▶ Make the necessary settings for cooling mode in the service menu
( instructions for control unit, Heating circuit settings section).
8.7 Adjusting the room temperature-dependent
controller
▶ Install the room temperature-dependent controller according to the
instructions (separate Installation and Operating Instructions).
▶ Set the room temperature-dependent controller as remote control Fb
(separate Installation and Operating Instructions).
▶ Set the room temperature-dependent controller as control unit for
heating circuit 1 (separate Installation and Operating
Instructions).
▶ Make the room temperature settings (separate Installation and
Operating Instructions).
9 Maintenance
WARNING
Danger to life from electric shock!
Touching live electrical parts can cause an electric shock.
▶ Before working on electrical parts, disconnect all phases of the
power supply of the entire heating system (fuse/miniature circuit
breaker) and secure to prevent unintentional reconnection.
NOTICE
Deformation due to heat!
If the temperature is too high, the insulation (EPP) in the indoor unit
deforms.
▶ When carrying out brazing work in the heat pump, protect the
insulation with a heat resistant cloth or damp cloth.
▶ Only use genuine spare parts!
▶ Refer to the spare parts list when ordering spare parts.
▶ Replace removed gaskets and O-rings with new ones.
The tasks described below must be carried out during an inspection.
Display activated alarm
▶ Check the alarm log (instructions for the control device).
General work
▶ Check that the heating system is generally in proper working order.
▶ Perform a visual inspection and function check of the heating system.
▶ Check all pipes for signs of corrosion and leaks.
▶ Replace any corroded pipework.
▶ Check the system for unusual noises.
▶ During the annual inspection, check the correct function of all
regulating, control and safety equipment and, where applicable, for
correct settings.
Function test
▶ Carry out function check ( Chap. 7.3).
9.1 Draining the heating system
The heating system must be drained when replacing hydraulic
components (e.g. DHW circulation pump) (Chapter 2.3).
▶ Interrupt the power supply to the outdoor unit, indoor unit and
external booster heater.
▶ Close all valves in the heating system.
▶ Close all automatic air vent valves in the heating system.
▶ Interrupt the flow at the particulate filter, close ball valve if necessary.
▶ Connect a hose to the drain valve of the heating system and route the
other end to a drain.
▶ Open the drain valve.
▶ Wait until no more water flows into the drain.
When water no longer flows, the indoor unit is empty.
9.2 Replacing components
▶ Interrupt the power supply to the outdoor unit, indoor unit and
external booster heater.
▶ Drain the heating system (Chapter 9.1).
▶ When replacing temperature sensors, make sure they are connected
correctly during installation (Fig. 9.2 and 49).
▶ Replace component (instructions for component).
▶ Fill and vent heating system (Chapter 7.1).
▶ Restore the power supply to the indoor and outdoor unit.
9.2.1 Replacing the pump
▶ Interrupt the power supply to the outdoor unit, indoor unit and
external booster heater.
▶ Drain the heating system (Chapter 9.1).
▶ Remove the hood (Chapter 5.3.1).
▶ Allow the system to cool and depressurise it.
▶ Pull off 2 plugs (power supply and signal) on the pump (Fig. 41).
▶ Remove the lock screw and pull the locking plate forwards and out
(Fig. 42).
NOTICE
Damaged and leaking connector pipes!
The screw fittings and connector pipes may be damaged if excessive
torques are applied when loosening and tightening the union nuts.
▶ Use a suitable tool.
▶ Counterhold at the coupling points.
▶ Perform the disassembly and assembly correctly.
▶ Undo union nuts at the pump then remove the pump and gaskets
(Fig. 43). As you do so, counterhold at the coupling points using a
suitable tool.
▶ Insert new pump with new gaskets and fit union nuts on the pump.
Tighten the union nuts by hand then use a tool to turn them by approx. ¼
revolution.
▶ Fit locking plate.
▶Connect cables.
▶ Fill and vent heating system (Chapter 7.1).
▶ Carry out tightness test.
▶ Restore the power supply to the indoor and outdoor unit.

Bosch Compress Hybrid 3400i AW Specifications

General

Brand	Bosch
Model	Compress Hybrid 3400i AW
Category	Heat Pump
Language	English