Winterwarm DXA100, Руководство по установке

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15 INSTRUCTION MANUAL AIR HEATER TYPE DXA
8 Combustion settings
In principle, it is not necessary to adjust the control shortly
after commissioning the air heater. When the control does
have to be adjusted after a period of use or after installing
a new heater, this must be done by a qualified person
using calibrated equipment.
DANGER! A poor adjustment can lead to overheating of
the air heater and/or production of toxic carbon monoxide.
8.1 Adjusting the burner settings
The flow of gas to the burner is controlled with a gas valve.
The valve must be set to the correct burner pressure. The
minimum gas pressure switch is mounted on the right side
of the measuring point (figure 13).
Figure 13 - Main parts of the gas valve
1 Measuring point of gas supply pressure.
2 Measuring point of burner pressure.
3 Adjuster screw for burner pressure.
To adjust the burner pressure, do the following:
1. Switch off the air heater.
2. Connect the pressure meter to the measuring point
(figure 13 - 2).
3. Switch on the air heater and start heating.
4. Check whether the burner pressure is equal to the
nominal burner pressure for this air heater (see
§3.1 - Technical specifications).
5. Record the measured value as a reference for the
next measurement.
6. If the burner pressure does not correspond with the
specified value, turn the adjuster screw (figure 13 -
3) to the specified value.
8.1.1 Measuring the CO
(2)
values
Figure 14 - Measuring combustion values with a probe
To measure the CO and CO
2
values, do the following:
1. Switch on the air heater and allow it to heat for
about 5 minutes.
2. Measure the CO value.
3. Measure the CO
2
percentage in the flue gas.
4. Record the CO and the CO
2
values as a reference
for the next measurement.
5. If the CO value exceeds 15 ppm:
or
If the CO
2
value does not correspond to the
specified percentage (table 1):
a. Check the burner pressure air inlet opening of
the system fan to see if the CO
2
value deviates
by more than 1%.
b. Measure the burner pressure (figure 13 - 2).
c. Check whether the gas pipe diameter is too
small (gas pressure too low).
d. Repeat steps 2 till 4.
Table 1 shows the approximate nominal CO
2
percentages
for the models (air temperature 20°C):
Nominal CO
2
percentage
Gas type DXA75 DXA100 DXA120
High calorific gas (G20) 7.5% 7.5% 7.5%
Low calorific gas (G25) 7.7% 7.7% 7.7%
Butane (G30) 8.5% 8.5% 8.5%
Propane (G31) 8.5% 8.5% 8.5%
LPG 8.0% 8.0% 8.0%
Table 1 - CO
2
values per gas type and heater model