Gas hot-air heater MONZUN
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instalation, operation instractions and maintenance manual
16
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EN
Gas valve and venturi tube removal:
1. Disconnect the MONZUN heater from the electrical network and
close the gas supply.
2. Remove the door of the burner box.
3. Disconnect the internal gas hose.
4. Remove the control automatic from the gas valve.
5. Disassemble the Venturi with the gas valve (2 M6 screws with
4 mm hex).
6. Remove the gas valve from the Venturi tube (3 M6 screws with
4 mm hex).
7. Install in the reverse order and perform a leak test and check the
function of the device.
Venturi tube adjustment after replacement:
This is a pre-setting of a mixture that is easy to ignite.
1. Install the Venturi tube to the gas valve and then together to the
burner fan.
2. Completely close the richness adjusting screw = tighten as far as it
will go, then loosen the number of turns according to the
Tab. 10.
ADJUSTMENT ACCORDING TO THE FLUE ANALYZER IS ABSOLUTELY NECESSARY!
Monzun [kW]
Fuel
Venturi tube
Number of revolutions of adjusting screw
from fully closed = enable
15, 20
G20 (natural gas)
203
6.5
G25 (natural gas)
7.5
G30/G31 (propane-butane)
3
30, 40
G20 (natural gas)
202
5.5
G25 (natural gas)
6.5
G30/G31 (propane-butane)
2
50, 60
G20 (natural gas)
201
5
G25 (natural gas)
6
G30/G31 (propane-butane)
1.5
Tab 10:
Pre-setting the richness of the mixture after replacing the venturi tube
Air fan removal:
1. Disconnect the MONZUN heater from the electrical network and
close the gas supply.
2. Remove the door of the burner box.
3. Disconnect the air fan cable from the terminal box.
4. Remove the air fan from the fan carrier.
5. Install in reverse order and check the function of the device.
Conversion to another type of fuel
Conversion of MONZUN heaters to other fuels may only be carried out by a service technician authorized by MANDÍK, a s ,
who will then put the heater back into operation
Necessary equipment:
• Flue gas analyser
• Computer with Honeywell ESYS software and cable for connec-
tion to the control automatics
• Screwdriver to adjust the richness of the mixture
When converting to a different fuel, no parts are replaced, the re-
building consists in setting the appliance to a new fuel.
Necessary equipment:
1. Setting the burner fan speed to the respective fuel, see
Tab. 6 –
Tab. 8
. The speed setting is performed from the computer using
Honeywell ESYS software. The computer is connected with con-
trol automatics by Honeywell DI100001U cable. The heater must
be connected to the power supply to set the speed.
2. The fuel/air richness is adjusted by the adjusting screw on the
bottom of the Venturi tube. By loosening the screw, the fuel is
added to the mixture, and the fuel goes away by tightening. The
adjusting screw has a right-hand thread.
When adjusting the richness of the mixture, first perform a pre-ad-
justment on the heater switched off, and after switching on the heat-
er and igniting the burner, adjust the richness of the mixture using
the flue gas analyser to the values in
Tab. 6 – Tab. 8
.
