Minimum Volume And Execution Of The Heating System; Installation; Transport - Bosch Compress 7400i AW Installer's Manual

Installation

Fig. 9 Condensate pipe in gravel bed
[1] Concrete foundations
[2] Shingle 300 mm
[3] Condensate tube 32 mm
[4] Gravel bed
4.3 Minimum volume and execution of the heating
system
To safeguard the heat pump function and avoid an excessive number of
start/stop cycles, incomplete defrosting and unnecessary alarms, it
must be possible to store a sufficient amount of energy in the system.
This energy is stored in the water volume of the heating system, and also
in the components of the system (radiators) and concrete floor
(underfloor heating system).
As the requirements for different heat pump installations and heating
systems vary considerably, a minimum water volume in litres is generally
not specified. Instead, the system volume is considered to be sufficient
if certain conditions are met.
Underfloor heating system without buffer cylinder
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
8
1
2
3
4
areas can lead to the auxiliary heater being activated in the final phase of
the defrosting process.
2
• ≥ 6 m floor area required for heat pump 5 OR – 7 OR.
To ensure maximum energy savings and avoid auxiliary heater operation,
the following configuration is recommended:
2
• ≥ 30 m floor area for heat pump 5 OR – 7 OR.
System with radiators without mixer and buffer cylinder
If the system only contains a few radiators, the auxiliary heater may be
activated in the final phase of the defrosting process. The radiator
thermostats must be opened fully.
• ≥ 1 radiator with 500 W rating required for heat pump 5 OR – 7 OR.
To ensure maximum energy savings and avoid auxiliary heater operation,
the following configuration is recommended:
• ≥ 4 radiators with 500 W rating for heat pump 5 OR – 7 OR.
Heating system with underfloor heating system and radiators in
separate heating circuits without buffer cylinders
A room temperature-dependent control unit should be installed in the
largest room (reference room) instead of room thermostats. Small floor
areas or only a few radiators in the system can lead to the auxiliary heater
being activated in the final phase of the defrosting process.
• ≥ 1 radiator with 500 W rating required for heat pump 5 OR – 7 OR.
Although a minimum floor area is not required for the underfloor heating
circuit, to avoid auxiliary heater operation and achieve optimum energy
savings, additional heating thermostats or several valves of the
underfloor heating system must be at least partially open.
Only heating circuits with mixer
A buffer cylinder is essential in heating systems consisting only of
heating circuits with mixer.
• Required volume for heat pump 5 OR – 7 OR = ≥ 50 litres.
Only fan convectors
To prevent the auxiliary heater from being activated in the final phase of
the defrosting process, a buffer storage tank with a capacity of ≥ 10 l is
required.
5 Installation
NOTICE
Damage to the heat pump due to water!
Electrical connections and electronics can be damaged if they are
exposed to water. The outer casing is a prerequisite for meeting the heat
pump's IP rating.
▶ The heat pump must not be stored outdoors without its side panels,
front plate and roof.
▶ Mount side panels, front plate and roof without delay after all
connections are done.
5.1

Transport

The heat pump must always be transported and stored in an upright
position. It can be tilted provisionally, but not laid flat.
The heat pump must not be stored at temperatures below – 20 °C.
The heat pump can be carried by the belt handles.
Compress 7400i AW – 6721833372 (2021/09)