20
Mounting Position
Leak Test
Ignition Gas Connection
Ignition Burner Type ZT0
Mounting position
Gas pressure regulators and valves can
be mounted in vertical lines in any posi-
tion within the 360° range. In horizontal
lines they must not be mounted over-
head and only 180° in the upper sector.
The ball valve and filter can be mounted
in any desired position. Take care that
the housing does not make contact with
the wall and is clear by minimum 20
mm. Do not use the spring bolt of the
regulator and the solenoid elements of
the valves as levers.
Leak test
Check the screwed joints and flanged
connections for absence of leaks. The
leak test of the joints should be made
under pressure using only foaming
agents approved by DVGW and not
causing corrosion.
Electrical wiring of gas valves
Check that the data given on the name-
plate of the gas valves agree with the
mains voltage.
Open the terminal box of the valve.
Feed the connection cable through the
screwed union (conduit thread Pg 13.5)
and connect the terminals marked
accordingly.
L = phase
N = zero conductor
= protective conductor
(green-yellow)
Disconnectable joint
An easy-to-disconnect joint with flat
sealing (e.g. compensator) should be
provided to allow the boiler door to be
swivelled out if required for mainte-
nance work on the boiler (furnace
chamber). This compensator should
also be designed to accommodate the
axial or lateral expansion and absorb
vibrations.
Ignition gas connection
An ignition burner is used to ignite the
main gas flame. The ignition gas line is
branched out of the gas control group
between the two gas valves and instal-
led to the ignition burner on the shortest
possible way. In the case of oil and
dual-fuel burners the burner is ignited
with propane supplied through a sepa-
rate R „ propane connection. The igni-
tion gas flow rate may be adjusted on
the volumetric flow control valve of the
ignition gas valve or directly on the igni-
tion gas burner. The required gas pres-
sure for the ignition gas burner is 50-
150 mbar. It is advisable to install a gas
pressure regulator upstream of the igni-
tion gas burner. The air pressure for the
ignition gas burner should be between
10 and 30 mbar. The boiler back pres-
sure shall not be taken into account.
The air pressure should be adjusted in
accordance with the gas pressure to
ensure an undelayed ignition and a
good flame pattern.
1
Transformer unit with built-in
ignition transformer
2
Electrical angular plug connector
3
Gas connection, may be
connected on either side right and
left with gas test socket
4
Air connection, mounted to
transformer unit
5
Air test socket
6
Igniter tube, mounted to air flange
7
Spacer ring
8
Ignition electrode connection rods
9
Gas tube
10
Ignition electrode connection rods
11
Gas nozzle for natural gas or
propane
12
Mixing chamber
*
The outside diameter will be 50 mm for
tube lengths above 4000 mm and for all
high-grade steel tubes.
Mounting flange
View A
Gas RP1/2
normally left
Air Rp1
Ignition Burner Type ZT0
