Main Electrical Supply; Room Thermostat Connection; Dhw Tank Sensor Connection; Outdoor Temperature Sensor - Bosch SSB85 Service Manual

30 | Electrical supply
Electrical connection:
DHW Tank
CASCADE MOD Gas Out
LINK BUS Switch Door
1 2 3 4 5 6 7 8 9 10 11 12 13 14
Outdoor sensor
DHW tank sensor
or aquastat
Room thermostat
Supply sensor
Fig. 86 Electrical connection
9 .3

Main electrical supply

Connect the electrical supply and ground to terminals 116-117-118.
9 .4

Room thermostat connection

Connect the room thermostat to terminals 11-12.
9 .5

DHW tank sensor connection

Connect the DHW tank sensor to terminals 9-10.
9 .6

Outdoor temperature sensor

If outside temperature control is to be used, the outside probe needs to
be connected to terminals 7-8. The probe shall be installed on an outer
wall, North or North/East, away from windows, doors and ventilation
grids. Never install the probe in a position exposed to the sun. The
maximum cable length is 300' (100 meters), if the cable length exceeds
32' (10 meters) a shielded cable is required and shall be connected to
chassis ground.
WARNING: oute the sensor cable away from High Voltage
a
cables.
6720866940 (2017/11) US
Room
Supply
Sensor Thermostat Sensor
Boiler pump
System pump
Pump CH Pump DHW
Boiler
Pump
L N L
N
L 3 Way
101 102 103 104 105 106 107 108 109
L N
L
N
Relay (*)
Furnished and
Installed by others
L
N
120 V Neutral
9 .7

Supplementary circulating pump relay

The maximum amp load for each pump (in addition to the boiler pump)
is 2Amps when 1 pump is connected. For this reason, if the power
consumption of each pump is higher than 84 watt, a relay (*) must be
used as shown on the diagram above.
120 V Main in
Alarm 120 V Aux
N
N N
L L L
110 111 112 113 114 115 116
DHW tank pump
120 V Line
Ground
(**)
N
117 118
SSB