Fault Signalling; Protecting The Pilot Burner From Overload; Installation - Honeywell Krom Schroeder BCU 480 Manual

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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 and the ignition transformer used.
SA1
t [s] Ignition transformer TZI
SA
3 5-15/100
5 5-15/100
10 5-15/100
3 7-25/20
5 7-25/20
10 7-25/20
3 7,5-12/100
5 7,5-12/100
10 7,5-12/100
3 7,5-20/33
5 7,5-20/33
10 7,5-20/33
BCU 480 · Edition 03.16l
Max. start-ups/min.
6
6
3
3
2
1
6
4
2
4
3
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
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).
61