Electrical connections 7
Logamax plus GB162-80 kW/100 kW - Subject to modifications resulting from technical improvements! 31
7.1.2 Low voltage connections
z Connect all components to the relevant terminals:
RC Terminal - Room Controller
z Connect a Room- or Cascade controller to the orange
RC terminal (fig. 31). See also paragraph 7.1.4.
FA Terminal - Outdoor temperature sensor
If outdoor temperature-dependant control operation is used,
an outdoor temperature sensor must be connected.
z Connect the outdoor temperature sensor to the blue FA
terminal (fig. 31).
WA Terminal - Potential-free heat demand
With this connection the room temperature-based modu-
lating function of the boiler is not used. This has a negative
effect on comfort and energy consumption. The boiler will
now only modulate up to the preset space heating water
temperature.
z Connect the potential-free heat demand contact (On/Off
thermostat) or relay panel end switch to the green WA
terminal (fig. 31). The maximum allowed resistance of
this circuit is 100 ohms.
FW Terminal - DHW temperature sensor
z Connect the external DHW temperature sensor to the
grey FW terminal, using the harness enclosed with the
DHW temperature sensor.
Fig. 31 External connection board connections
1234 5 6 7 8 9 10
RC
FA
WA
FW
EV DWV
Netz
PK
PS
PZ
WARNING
due to electric shock.
Make sure no power is supplied to the boiler
when making connections.
no. abbr. color component
1 RC orange Room controller RC and EMS bus
2 FA blue Outdoor-temperature sensor
3 WA green Potential free On/off thermostat
4 FW grey DHW temperature sensor
5 EV red External switch contact, potential free, e. g. for
floor heating safety
6 DWV green Connection for external three-way valve
7 PK green External heating pump 120 VAC (for use with
non Buderus pump group)
8 PS grey DHW tank pump 120 VAC
9 PZ lilac DHW recirculation pump 120 VAC
10 Netz white Main power connection 120 VAC
NOTICE
z The RC and WA terminals cannot be used
simultaneously.
NOTICE
z It is not possible to connect more than one
DHW temperature sensor in the boiler.
z Connect a DHW temperature sensor suitable
for this particular boiler.
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