Hoval TopGas 30, Technical Information Installation Instructions, Page: 8 / 34

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Technical details
Boiler flow resistance 2.3
Short description of the automatic fir- 2.4
ing unit BIC 335
The automatic firing unit operates both without con-
troller (TTT/N) and also without room station (RS-
OT). The automatic firing unit comprises the follow-
ing functions
- PWM- fan (230V~)
- Modulating operation
- Inputs for
Flow sensor
Return sensor
Flue gas sensor
Gas pressure deflector
Air pressure deflector:
(not used)
Water pressure deflector
Safety temperature limiter:
(external flue gas thermo-
stat)
HW-buffer sensor
Outdoor sensor
Locking entry:
(Burner blocking)
- Status exit „Failure“ (invertible by parameter set-
ting)
- Three-way-valve control for heating/hot water
or loading pump control (230V~exits); Exit for a
three-way-valve / HW loading pump is invertible
by a parameter.
- Collective electrode for ignition and flame guide
(Ionisation)
- Main gas valve (ev. LPG- valve) / heating room
ventilation accessable
W
ater-side resistance [mbar]
Flow rate [m
3
/h]
0
50
100
150
200
250
300
350
400
450
500
0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0 4,5 5,0 5,5
Seite 4 / 6
Boiler incl.
connection kit
Boiler only
Fuses
On the automatic firing unit theres is a mains fuse.
The breakdown of this fuse (2AT) is noticeable by an
empty display even the main deflector is on.
Ionisation flow
The value of the ionisation flow is noted on the infor-
mation level and appears as step 8. The access to
the information level is explained in chapter 2.5.
Interface to display -
OpenTherm- interface (RS-OT, TTT/N) -
RS 232- interface to PC -
Start attempts: 4 -
Safety period: 5 sek -
Ignition period: 5 sek -
Pre-ventilation period: 20 sek -
After-run time main pump / heating pump -
(230V ~): 10 min
After-run time three-way valve / HW-loading pump:
-
2 min
Restart locking after a heat demand: 2 min
-
Restart locking after a temperature blocking: -
2 min