Operating Function Without Leakage Test - elco CB-P2.170 G-U/TCG KN Betriebsanleitung

Function

Operating function without leakage test

Safety function
Operating function
A pre-ventilation time of 24 seconds begins
when first powering up, after a power cut or
a lockout, after the gas supply has been cut
or after a shutdown for 24 hours.
During the pre-ventilation time:
- the air pressure is monitored
- the combustion chamber is monitored to
detect any flame signals.
At the end of the pre-ventilation time
- the ignition is switched on
- the main and safety solenoid valves are
opened.
- burner start-up
Monitoring
The flame is monitored by an ionization
probe. The probe is fitted with insulation to
the gas head and is routed through the
flame disk into the flame zone. The probe
must not have any electrical contact with
earthed parts. The burner switches to
malfunction if a short circuit occurs between
the probe and the burner earth. During
burner operation, an ionised zone is
produced in the gas flame through which a
rectified current flows from the probe to the
burner tip. The ionization current must be at
least 7μA.
Safety functions
- If no flame is produced when the burner is
started (gas release), the burner is
switched off at the end of the safety time
which lasts no more than 3 seconds and
the gas valve closes.
- If the flame is lost during operation, the gas
supply is cut within a second. A new start-
119.2
72
up sequence is activated. If the
burner starts, the operating cycle starts
running. Otherwise a lockout occurs.
- If there is an air failure during
preventilation or operation, a lockout
occurs.
- If there is a gas failure, the burner either
stops or will not start. As soon as the gas
pressure recovers a sufficient value,
burner starts again.
During the regulator shutdown
- The control thermostat interrupts the heat
request.
- The gas valves close
- The flame goes out
- The burner is ready for operation
Option: quick start with continuous
motor operation
N.B.: only for approved heat generators
Function:
- Blower motor starts up as soon as the
burner is supplied with voltage.
- Blower motor also runs in standby.
- When heat is requested, the burner motor
is switched off briefly in order to check the
idle position of the air pressure switch.
- The burner then starts, without further
preventilation, within approximately 4
seconds.
Option: quick start with longer
preventilation
N.B.: This option may only be used on
heat generators that are approved for the
purpose by the manufacturer in
consultation with ELCO.
Function:
When the system is switched on for the first
time, after a power failure, lack of gas or
119 pBr Y13 119.1 104
F6
F4
F6
Y13
Y12
1
104
106
108
119pBr
119.1
119.2
05/2014 - Art. Nr. 420010540302
after the system has been out of operation
for 24 hours, a preventilation phase takes
place before the burner is switched on and
may last up to 600 seconds, depending on
the heat generator. At subsequent controller
shutdowns, the burner then starts within 4
seconds, without preventilation, when new
heat requests are made. With this option,
the automatic valve tightness check is
always specified and must not be switched
off.
CH note
In accordance with SSIGE instructions, it is
compulsory to install a gas safety valve
(mark 1) in the pipe.
DE Note
In compliance with the reference layout
applicable to boiler rooms, sites with gas
furnaces must be fitted with a thermal gas
shut-off valve (mark 1).
Y12 F4 106 108
119.1
Gas pressure switch.
Air pressure switch
Main solenoid valve
Safety solenoid valve
Thermally-triggered safety shut-off valve (installation
by installer).
Gas pressure regulator
Filter
Gas ball valve (installation by installer)
Measuring point for gas outlet pressure
Measuring point for gas pressure in valve space.
Air pressure measuring point
1