Bosch Condens 8300i W Installation And Maintenance Instructions Manual page 22

Installation
Symbol Function
Without function
External flow temperature sensor (e.g.
differential sensor)
Outside temperature sensor
Without function
External switching contact, volt free
(e.g. temperature switch for underfloor
heating system, bridged in the
delivered condition)
24V-On/Off temperature controller
(volt free)
External operator unit/external module
with 2-wire BUS
BUS
2 1
Fuse
230V-On/Off temperature controller
230V
OUT
L N LR LR
Table 12 Terminal strip for external accessories
22
Description
▶ Connect the external flow temperature sensor.
▶ Set hydraulic low loss header with service function 2-A1.
▶ Connect the outside temperature sensor.
If several external items of safety equipment, such as TB 1, and a condensate pump are
connected, they must be connected in series.
Temperature switch is only to be connected to the device if the heating system is equipped
with an underfloor heating system and has a direct hydraulic connection: when the
temperature switch trips, the CH and DHW modes are interrupted.
▶ Remove the jumper.
▶ Connect the temperature switch.
Condensate pump: the CH and DHW modes are interrupted if the condensate drain is faulty.
▶ Remove the jumper.
▶ Connect the burner shutdown contact.
▶ Establish an external 230V-AC connection.
▶ Remove the jumper.
▶ Connect the On/Off temperature controller.
▶ Remove the jumper at I3.
▶ Connect the communication cable.
There is a replacement fuse on the inside of the cover.
▶ Remove the jumper at L-LR and N-LR.
▶ Connect the 230V-On/Off temperature controller.
Condens 8300i W – 6721841531 (2022/10)