Installation and operating instruction
Gas condensing unit WTC-GB 15-B Compact and WTC-GB 25-B Compact
3 Product description
83309302 1/2018-05 La
18-196
3.3.5 Program sequence
Ignition speed
The fan stars at heat demand
1
and drives to ignition speed
2
.
Ignition
Ignition
3
starts once the ignition speed has been stabilised. The gas valves
4
open. A flame is formed.
Safety time
Following the safety time (3.5 seconds)
5
ignition is switched off.
Flame stabilisation
If a flame signal
6
is transmitted, the flame stabilisation time
7
will follow.
Forced partial load
In operating mode heating, forced partial load
8
is carried out first. For the dura-
tion of the delay time, the heating capacity is limited, forced partial load is omitted
for DHW loading.
Operation
The internal unit temperature regulator sets the speed setpoint for the fan
9
within
the programmed load limits.