Winterwarm HR Series, Installation Manual, Page: 19 / 28

19 INSTRUCTION MANUAL AIR HEATER TYPE HR
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.
This valve must be set to the high and a low power settings
of the heater. When adjusting, the CO
2
or O
2
in flue gas has
to be monitored with a calibrated analyser.
The gas valve is adjusted with two screws (figure 22):
–
The Offset adjuster screw for Low fire.
–
The Ratio adjuster screw for High fire.
Figure 22 - Main parts of the gas valve
The air heater must first be commissioned at High fire.
NOTICE If the air heater does not ignite while sparking,
close the air-openings of the gas-air mixer during ignition.
Use your forefinger. The gas mixture will become richer
and will ignite more easily.
Look for the correct CO
2
value for the air heater in §3.2.
Adjust the CO2 value if the difference is more then 0,3%:
1. Check the CO
2
value in High fire (mode 4).
2. Turn the Ratio adjuster screw to the right to de-
crease the CO
2
value
.
3. Turn the Ratio adjuster screw to the left to increase
the CO
2
value.
4. Check the CO
2
value in Low fire (mode 2). The CO2
value in Low fire should be lower than in High fire.
5. Turn the Offset adjuster screw to the left to de-
crease the CO
2
value.
6. Turn the Offset adjust screw to the right to increase
the CO
2
value.
7. Return to High fire (mode 4) and readjust the CO
2
value with the Ratio adjust screw.
8. Return to Low fire (mode 2) and readjust the CO
2
value with the Offset adjuster screw.
9. Repeat the steps above until both CO
2
values are
ok.
DANGER! Always measure the air heater’s CO
production. Too much CO usually means the gas mixture
is too rich. Adjust this if necessary with the two adjusters
(figure 22). The concentration of CO should always be
below 100 ppm.
8.2 Converting to another gas type
CAUTION! The air heater’s gas type may only be
converted by the manufacturer or its representative.
Contact your supplier for more information.
9 Troubleshooting
If the air heater malfunctions, first check if the problem is
caused by external circumstances (e.g. no supply power).
If the problem is not caused by external circumstances,
use the tables and instructions in this chapter to fix the air
heater. NOTICE Please remember the built in waiting times of
the air heater; the signals of the LED’s and the code on the
display. Do not react too soon.