Honeywell Krom Schroeder BCU 480 - Fault Signalling; Protecting the Pilot Burner from Overload; Installation

BCU 480 · Edition 03.16l 61
Project planning information
6.11 Fault signalling
The fault signalling contact opens, as soon as the mains
voltage fails.
6.12 Protecting the pilot burner from overload
To protect the unit against overload by too frequent cy-
cling of the pilot burner, the number of start-ups within
one minute is limited for the BCU. Excessive cycling of
the pilot burner triggers a fault message (blinking
53
). The max. number of start-ups per minute depends on
the safety time t
SA1
and the ignition transformer used.
t
SA
[s] Ignition transformer TZI Max. start-ups/min.
3 515/100 6
5 515/100 6
10 515/100 3
3 725/20 3
5 725/20 2
10 725/20 1
3 7,512 /100 6
5 7,512 /100 4
10 7,512/10 0 2
3 7,520/33 4
5 7,520/33 3
10 7,520/33 2
6.13 Installation
Recommended installation position: vertical (cable
glands pointing downwards).
When installing, ensure that there is sufficient space to
open the BCU.
From inside
Open BCU and screw on with four screws (Ø 4 mm, min.
length 15 mm).
From outside
163 mm
185 mm
7.28"
6.42"
Screw on the closed unit to the rear with 4 self-tapping
screws (enclosed).
Otherwise, mount with external securing bars or the
fastening set, see page 71 (Accessories).