External Connection Board Fuse - Buderus Logamax plus GB142-24 Servicing Instructions

8.1.2

External connection board fuse

 Switch off the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "0" (Off).
 Remove the casing.
 Remove the cover from the connection box (fig. 6).
 Dismantle the fuse holder (fig. 7, pos. 10).
 Remove the fuse from the fuse holder.
 Check the circuit continuity through the fuse using the volt-ohm-
multimeter. If broken, replace it with a (new) ceramic fuse
5 amps, 250V fast blow (F5AH, 250V).
 Re-install the cover on the connection box.
 Fit the casing.
 Switch on the power supply of the heating system on the circuit
breaker.
 Set the main switch on the BC10 to "1" (On).
Logamax plus GB142-24/30/45/60 - We reserve the right to make any changes due to technical modifications!
fig. 6 Removing the cover from the connection box
RC FA WA FW EV
1 2 3 4 5 6
fig. 7 External connection board
pos. 1: RC Room thermostat (connection color orange)
pos. 2: Outdoor-temperature sensor (connection color
blue)
pos. 3: Potential-free On/Off thermostat (connection color
green)
pos. 4: DHW temperature sensor (connection color grey)
pos. 5: External switching contact, potential-free for floor
heating safety etc. (connection color red)
pos. 6: DO NOT USE
pos. 7: Primary loop pump 120V 60Hz (connection color
green)
pos. 8: DHW tank pump 120V 60Hz (connection color grey)
pos. 9: DHW recirculating pump 120V 60Hz (connection
color lilac)
pos. 10: main connection 120V 60Hz (connection color
white)
pos. 11: Fuse holder
Actions 8
11
PK PS PZ Grid
7 8 9 10
85