Buderus Logamax plus GB142-24 Installation Instructions Manual page 19

▶ Install a 120V cable to the boiler ( fig. 30, [1]).
▶ Lead the cable through the cable guide ( fig. 30, [2]).
Fig. 30 External connection board
Terminals 1 – 6 ( fig. 31) are low-voltage connections and terminals
7 – 10 ( fig. 31) are 120 Volt connections.
2
4 6
1 3 5
Fig. 31 Connections to external connection board
[Pos] Abbr. Color Component
[1] RC orange RC room controller connection or for an
AM10 or other module
[2] FA blue Outdoor-temperature sensor
[3] WA green Potential-free On/Off thermostat
[4] FW gray DHW temperature sensor
[5] EV red External switching contact, potential-free for
floor heating safety etc.
[6] DWV green Connection for external 3-way valve
[7] PK green Primary loop pump 120 V 60 Hz
[8] PS gray DHW tank pump 120 V 60 Hz
[9] PZ lilac DHW recirculating pump 120 V 60 Hz
[10] Netz white Main power connection 120 V 60 Hz
CAUTION: RISK OF ELECTRIC SHOCK.
Once the main power supply is on then there is 120V on
terminals 7 – 10 (can only be used with the correct
configuration of the control unit and specific system
hydraulics), if the main switch of the BC10 basic
controller is switched on.
RC terminal
Connector for installation of an RC controller for indoor reset operation
or a module like the AM10.
FA terminal
This is the terminal where you connect the outdoor temperature sensor.
Only necessary for outdoor weather responsive operation.
WA terminal
For connection of a potential free thermostat or relay panel end switch.
FW
Connection for an external DHW tank sensor.
Logamax plus GB142-24/30/45/60 – 6720820104 (2017/05)
1.
2.
72150200-29.1TD
10
7 8 9
72150200-30.1TD
EV terminal (external switching contact)
This terminal can be used for example for the safety switch of floor
heating. This protects the floor heating against too high boiler water
temperatures (external manual reset high limit). The boiler is shut down
when the external switching contact is opened.
The normally closed contacts of a LWCO will shut down burner operation
but allow the pump to continue to operate in case of a low water
condition.
DWV
Terminal for connection of an external 3-way valve (not used).
PK
Connector for the primary loop pump 120 V 60 Hz.
PS
Connector for the DHW tank pump 120 V 60 Hz.
PZ
Connector for the DHW recirculating pump 120 V 60 Hz.
NETZ
Main power connector 120 V 60 Hz (-15% +10%).
120-volt connections
CAUTION:
Make sure that the power consumption of each of the
terminals 7 – 9 ( circuit diagram) does not exceed
250 W or 5 Amp.
CAUTION:
Label all wires prior to disconnection when servicing.
Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Electrical connections
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