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Commissioning
Picture 4.3.6: Measuring and setting points of the Hon-
eywell multiple setting device VK 4125
A Measuring nipple for inlet pressure
B Measuring nipple for outlet pressure
C Throttle screw for max. output (Inbus 4 mm)
D Offset-screw min. output (Torx T40)
C
D
B
A
Filling up the system
4.3.1
Old and new plants have to be rinsed and cleaned
-
professionally before filling up.
Filling or refilling of the plant: The requirements for
-
fill and top-off water according to chapter 4.3 must
be met. During the lifetime of the heat production
plant the maximum water content (sum of fill-up
and top-off water amount) shouldn‘t exceed the tri-
ple of the maximum fill-up quantity.
Example: maximum fill-up quantity (as in table 1,
chapter 4.3) 1200 l, maximum fill-up and top-off wa-
ter content during lifetime 3600 l.
Filling up the syphon at the condensation drain of
-
the boiler.
A line strainer for the boiler return is recom-
-
mended.
Minimum system pressure at the boiler:
-
Type
TopGas
®
(30,35,45,50,60)
Minimum system pressure
at the boiler
1,0 bar
The unit needs to be filled up slowly at the fill-up
and drain cock on the boiler, while the radiators are
open.
System corrosion and bleeding problems are
often caused by refilling or topping up. Drain
trap at the condensate drain must be filled with
water.
Gas adjustment
4.3.2
The adherence to the maximally permissible
limit values (CH: LRV) concerning CO und NOx
need to be checked during measuring at the
boiler site.
Bleeding the gas pipeline
4.3.3
Open the gas shut-off value and bleed the air from the
pipeline up to the gas fitting; comply with the relevant
regulations.
Commissioning
4.3.4
Place the boiler in operation according to the detailed
operating instructions.
Gas inlet pressure
4.3.5
The minimum flow pressure in the appliance connec-
tion pipeline must attain the following values:
Natural gas = 18 mbar
max. 50 mbar
Propane
= min. 42,5
max. 57,5 mbar
If the connection pressure for natural gas is below 15
or above 50 mbar, no setting and no commissioning
is to take place.
Gas fitting
4.3.6
The Hoval TopGas
®
is equipped with a Honeywell
pneumatic modulating multiple setting device. scope
of supply includes two solenoid valves (B+B), a screen
filter plus an installed pressure balance (1:1) – gas/
air servo controller.
The fan which is activated by the boiler electrical sys-
tem produces a speed dependent air flow. This creates
a pressure drop in a venturi tube. The air pressure is
transferred to the servo controller of the multiple setting
device where it brings about a pressure-proportional
change in the gas flow rate. The gas flow follows the
air flow in the given ratio (constant air factor in the
modulation range).
Setting the gas flow rate CO
4.3.7
2
(O
2
) and
measurement of NOx/CO content in the
flue gas (flue gas measurement)
Important basic information:
If the minimum connection pressure (chapter 4.3.5)
is too low (e.g. because of clogged gas filter, under-
dimensioned gas supply), the boiler will not achieve
the rated output indicated by the manufacturer. In this
case, please contact the gas supply company.