Electrical Connections; External Connection Board Connections - Buderus Logamax Plus GB142-24 Installation Instructions Manual

7

Electrical connections

Devices such as pumps, outdoor sensor and 3-way valve
are all connected to the external connection board.
The electrical connections to the boiler must be made in
accordance with all applicable local codes and the latest
revision of the National Electrical Code, ANSI/NFPA-70
Installations should also conform with CSA C22.
1 Canadian Electrical Code Part 1 if installed in Canada.
7.1

External connection board connections

Make all electrical connections inside the external connec-
tion box.
 Remove the cover of the external connection box
(fig. 28).
Connecting incoming power
The boiler must be electrically grounded in
accordance with local codes, or in absence of
local codes, with the National Electrical Code,
ANSI/INFPA 70 and/or the CSA C22.1, Elec-
trical Code.
 Install a 120V cable to the boiler (see fig. 29, pos. 1).
 Lead the cable through the cable guide (see fig. 29,
pos. 2).
Terminals 1 – 6 (fig. 30) are low-voltage connections and
terminals 7 – 10 (fig. 30) are 120 Volt connections.
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 temper-
ature sensor. Only necessary for outdoor weather respon-
sive 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 - We reserve the right to make any changes due to technical modifications!
Electrical connections
Fig. 28 Removing the cover from the external connection box
Fig. 29 external connection board
FW
FA
RC WA EV DWV
1 2 3 4 5 6
Fig. 30 Connections to external connection board
Abbr. Color Component
RC orange RC room controller connection or for an
AM10 or other module
FA blue Outdoor-temperature sensor
WA green Potential-free On/Off thermostat
FW gray DHW temperature sensor
EV red External switching contact, potential-free
for floor heating safety etc.
DWV green Connection for external 3-way valve
PK green Primary loop pump 120V 60Hz
PS gray DHW tank pump 120V 60Hz
PZ lilac DHW recirculating pump 120V 60Hz
Netz white Main power connection 120V 60Hz
7
1
2
Netz
PK PS PZ
7 8 9 10
27