External Booster Heater (Uncommon In Uk Market); Connect The Actuator Of The External Booster Heater (E.g. Floor Standing Boiler); Connect The Alarm Signal For The External Booster - Bosch Compress Hybrid 7000i AW Installer's Manual

Electrical connection
6.6

External booster heater (uncommon in UK market)

6.6.1 Connect the actuator of the external booster heater
(e.g. floor standing boiler)
The external booster heater can be connected in two different ways:
Power control via 0-10V output:
▶ Connect the external booster heater to the installer module at
terminal EM0 0-10V ( Chapter 12.2, page 33 [29]).
With some heat generators, an additional module (e.g. MU100, accessory)
must be installed to provide a 0-10V input.
– or –
On/Off control (volt free output):
▶ Connect the external booster heater to the connection terminal of the
relay box ( Fig. 28 [1], [2] and chapter 12.2, page 33 [23]).
When there is heat demand from the external booster heater, the
relay box establishes a zero volt connection between the contacts of
the connection terminal.
Fig. 28 Connection terminal on the relay box
[1] Connection terminal
[2] Relay box
The mixing valve does not open immediately after the external booster
heater is activated. A delay time for opening the mixing valve can be set
at the control unit (Chapter 8.5.2).
Always set the delay time to 0 min for hybrid applications.
Possible cycling of the boiler is a normal procedure. A buffer cylinder can
be installed if problems occur with the external auxiliary heater because
the elapsed time is too short.
▶ For more information, contact the manufacturer of the external
booster heater.
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6.6.2 Connect the alarm signal for the external booster heater
Connection of the alarm signal depends on whether or not the external
booster heater has a 230 V alarm output.
If the external booster heater is equipped with a 230 V alarm output:
▶ Remove jumper between terminal 61 and 64
( Chapter 12.2, page 33).
▶ Connect 230 V alarm signal (AC) as shown in figure 29 to the
installer module at terminal FM0 ( Chapter 12.2, page 33 [26]).
Fig. 29 Connection for external booster heater with 230 V alarm output
If the external booster heater is not equipped with a 230 V alarm output:
▶ Connect alarm signal as shown in figure 30 to the installer module at
terminal FM0.
Fig. 30 Connection for external booster heater without 230 V
alarm output
Compress Hybrid 7000i AW – 6721833053 (2020/09)
10030935-001
10030935-001