6720818454 (2016/02) US
SSB
20 | Installation
The general electrical connection is shown in the following diagram :
Fig. 19
(*) NOTICE: The maximum amp load for each pump is 1 A
when 2 or 3 pumps are connected. For this reason, if the
power consumption of each pump is higher than 84 watt,
use a relay as shown in figure.
If just one pump is connected, the maximum amp load
of this single pump is 2 A. For this reason if the power
consumption of the pump is higher than 168 watt, use a
relay as shown in figure Fig. 19.
(**) NOTICE: line voltage.
4 .5 .2
Access to the electrical terminal strip
To have access to the internal terminal strip of the boiler follow the steps
below (see Fig. 20).
► Rotate the lock at the top on the front panel and remove the front
panel as shown.
► Slide out the electrical box and remove the two screw from the front.
► Remove the box cover to have access to the terminal strip.
Fig. 20
4 .5 .3
Room thermostat connection
Connect the thermostat to terminals 11 and 12 as shown in Fig. 19.
4 .5 .4
Outside temperature sensor
If outside temperature control is to be used, the outside probe needs
to be connected to terminals 7 and 8 as shown in Fig. 19. The outside
probe shall be installed on an outer wall, North or North/East, away from
windows, door, and ventilation grids. Never install the probe in a position
exposed to the sun.
The maximum length is 300’ (100 meter), if the cable length exceeds
32’ (10 meters) a shielded cable is required and shall be connected to
chassis ground.
NOTICE: All Sensors and low voltage wiring shall not be
routed in direct contact or near high voltage power.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
101 102 103 104 105 106 107 108 109
116
118
117
L
N
L
N
L
N
CASCADE
LINK
MOD
BUS
Gas
Switch
Out
Door
DHW Tank
Sensor
Room
Thermostat
Supply
Sensor
Boiler
Pump
Pump DHW
120 V Main in
N
L
Boiler pump
DHW tank pump
Room thermostat
DHW tank sensor
or aquastat
Outdoor sensor
110 111 112
L
N
Alarm
113 114 115
L
N
120 V Aux
L
N
Pump CH
N
L
3 Way
120 V Neutral
Ground
120 V Line
Supply sensor
N
L
Relay (*)
Furnished and
Installed by others
Relay (*)
Furnished and
Installed by others
(**)
Relay (*)
Furnished
and
Installed
by others
System pump
Содержание Buderus SSB255
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Страница 67: ...SSB 6720818454 2016 02 US Spare parts 67 Notes ...