93
13.8 - Checking and
adjusting CO2 levels
Figure 12-7 lists the correct CO2 ranges
for a heater running at normal operating
conditions at an altitude below 4500
ft (1371m). CO2 values outside of the
ranges given in Figure 12-7 may lead to
malfunctioning of the heater and cause
it to prematurely fail. To check the CO2
value, carry out a combustion analysis
follow Section 13.8.1 or 13.8.2.
13.8.1 - Checking CO2
level on units model 199
WARNING!!!
During this
procedure compare also CO
(carbon monoxide) reading, with
the value given in Figure 12-7. If
this is higher, STOP the heater
and call the Factory service
department (see phone number
on the last cover page). Failure
to comply with this requirement
could result in severe personal
injury, death or substantial
property damage.
1. If it is not already present, create a
combustion analisys probe site at 8”
after the fl ue gas exhaust connection
(see Figures 11-9, 11-11 or 11-13,
item “H”). To do so, follow the vent
pipe manufacturers’ instruction.
2. generate a call for heat and wait until
the heater is fi ring;
3. gain access to the “Installers’ menu”
and set parameter 2010 to HIGH
(see Section 14.14). The heater will
now run for 20 minutes at high fi re
input;
4. wait 2 to 3 minutes for the CO2 to
stabilize;
5. insert the probe of a calibrated
combustion analyzer into the
combustion analisys probe “H” of
Figures 11-9, 11-11 or 11-13 and take
a fl ue gas sample;
13 - START-UP
6. compare the CO2 reading with the
high fi re range given in Figure 12-7,
making sure to use the range for the
gas type in use. If the CO2 reading
is outside the specifi ed range, it
must be adjusted operating on the
“E” screw of Figure 13-1. Use a
2.5mm Allen Wrench to turn the
screw (clockwise to reduce the CO2
level, counter-clockwise to increase
the CO2 level) in small increments
and wait for the CO2 to stabilize to
prevent overshooting the desired
value;
7. when CO2 level match the value of
Figure 12-7, seal screw “E” with red
paint or nail polish to discourage
tampering.
8. set value of parameter 2010 to
LOW. The heater will now run for 20
minutes at low fi re input;
9. wait 2 to 3 minutes for the CO2 to
stabilize;
10. compare the CO2 reading with the
low fi re range given in Figure 12-7,
making sure to use the range for the
gas type in use. The CO2 reading
must be inside the specifi ed range;
If not, STOP the heater and call the
Factory service department (see
phone number on the last cover
page).
11. set parameter 2010 to OFF
to return the heater to its normal
operating mode.
12. close the combustion analisys probe
“H” of Figures 11-9, 11-11 or 11-13
with a suitable cap in accordance
with the vent pipe manufacturers’
instruction.
WARNING!!!
Once the
cap “L” of Figures
11-9, 11-11
or 11-13
is right in place, with
the heater at high fi re, check
that it is absent from leakage
and is mechanically fi xed.
Improper cap fi xing can result
in excessive levels of carbon
monoxide which can result
in severe personal injury or
death!
13.8.2 - Checking CO2
level on units model 399
up to 1000
WARNING!!!
During this
procedure compare also CO
(carbon monoxide) reading, with
the value given in Figure 12-7. If
this is higher, STOP the heater
and call the Factory service
department (see phone number
on the last cover page). Failure
to comply with this requirement
could result in severe personal
injury, death or substantial
property damage.
1. If it is not already present, create a
combustion analisys probe site at 8”
after the fl ue gas exhaust connection
(see Figures 11-9, 11-11 or 11-13
item “H”). To do so, follow the vent
pipe manufacturers’ instruction.
2. keep the heater in stand-by by
removing any call for heat (remove
the room thermostat jumper, if
present, inside the junction box or set
the heating service to off by pushing
on the
button up to see the
OFF word
);
3. gain access to the Installer menu and
set parameter 2010 to HIGH (see
Section 14.14). Now the “Burner 1
(Master) will run for 20 minutes at
high fi re input;
4. wait 2 to 3 minutes for the CO2 to
stabilize;
5. insert the probe of a calibrated
combustion analyzer into the
combustion analisys probe “H” of
Figures 11-9, 11-11 or 11-13 and take
a fl ue gas sample;
6. compare the CO2 reading with the
high fi re range given in Figure 12-7,
making sure to use the range for the
gas type in use. If the CO2 reading
is outside the specifi ed range, it must
be adjusted operating on the “E”
screw of Figure 13-1 of the gas valve
closer to the burner unit in fi re. Use
a 2.5mm Allen Wrench to turn the
screw (clockwise to reduce the CO2
level, counter-clockwise to increase
the CO2 level) in small increments
and wait for the CO2 to stabilize to
prevent overshooting the desired
value;
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