44
Procedure for output adjustment (boilers designated for propane combustion):
The pressure regulator on the valve is put out of operation (set on the max. gas flow) and the gas supply
doesn’t have to be regulated on condition that the gas inlet pressure on gas pressure regulator before
entering the boiler is set on 30 mbar. If a different value is set on the gas pressure regulator before entering
the boiler (permissible 30 – 45 mbar range), the readjustment can be done directly on it (this only can be
done by a service worker of propane reservoir supplier ´s).
Warning:
After the propane boiler has been put into operation there must be properly discharged the inert gas
from a given reservoir in order to achieve the propane heating medium purity in compliance with
Č
SN 65 6481.
If the prescribed propane purity isn’t achieved there cannot be guaranteed a trouble-free boiler
commissioning.
11.4 Boiler conversion from „propane“ to „natural gas“
For the conversion from propane to natural gas the boiler will always work in single stage regime
(only the rated boiler output). The gas valve isn’t equipped with a High – Low coil which enables the
boiler double stage regime (rated - reduced output).
Conversion procedure:
1. Exchange the gas nozzles in burner of boiler. The nozzles for both types of gas differ in their diameters
(see. tab. no.4a and no.4b.), other dimensions are identical.
2. Exchange the gas nozzles in ignition pilot burner. The nozzles for both types of gas differ in their
diameters (see. tab. no. 11)
3. Fasten the burner.
4. Adjust the boiler output according to chap. no. 11.3.
5. The service worker is obliged to put a new boiler label on the boiler with all necessary data for a
given kind of fuel. This change must be recorded in guarantee certificate.
Tab. no. 11
Nozzles marking in Polidoro ignition pilot burner
Kind of gas
Nozzle marking in ignition pilot burner
Natural gas
0,45 A
Propane
0,24 P
11.5 Boiler conversion from “ natural gas” to „propane“
The boiler conversion from „natural gas“ to „propane“ is only possible for OVO T
ř
inec burner system in case
of ECO version and in case of basic design with circular burner tubes.
For the conversion from natural gas to propane the boiler will always work in single stage regime
(only the boiler rated output). The gas valve isn’t equipped with High – Low coil which enables the
double stage boiler regime (rated- reduced output), but the with a single regulator V 5306E1234.
Conversion procedure:
1. If you have VK 4100 Q 2003B or VK 4100 P 2004 two-stage gas valves designed for natural gas
combustion such a valve must be changed for the VK 4100 A 1002 single-stage valve. We disconnect
the feeder cable for High-Low coil from the electro-panel.
2. Change of the gas nozzle in the boiler burner. The nozzles for both types of gas differ in diameter (see
table no.3a and no. 3b), other dimensions are identical.
3. Change of the gas nozzle in the lighting burner. The nozzles for both types of gas differ in diameter (see
table no.11).
4. Fasten the burner.
5. Adjust the boiler output according to chap. no. 11.3.
6. The service worker is obliged to put a new boiler label on the boiler with all necessary data for a
given kind of fuel. This change must be recorded in guarantee certificate.
Summary of Contents for GARDE G 42 ECO
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