Electrical connections
8
Installation instructions Logamax plus GB142-24/30/45/60 • version 10/2007
27
We reserve the right to make any changes due to technical modifications!
Buderus • http://www.buderus.net
8
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.
8.1
External connection board connections
Make all electrical connections inside the external connec-
tion box.
z
Remove the cover of the external connection box
(fig. 28).
z
Install a 120V cable to the boiler (see fig. 29, pos. 1).
z
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.
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
Fig. 28
Removing the cover from the external connection box
Fig. 29
external connection board
Fig. 30
Connections to external connection board
1
2
RC
FA
WA
FW
EV
PK
PS
PZ
Netz
DWV
1 2 3
4
5
6
7
8
9
10
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
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.
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.