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3. Low Fire Adjustment (Offset)
a. Operate appliance at low fire 1% in service mode
(Fig.9).
b. Ensure the boiler is at low fire under a stable
operating condition whilst monitoring CO
2
/O
2
values.
c. If low fire CO
2
/O
2
values are still below tolerance,
record Low Fire CO
2
/O
2
in Table 4 – Section 2B
Direction INSTINCT Solo/Combi
Clockwise
Increase CO2 / Decrease O2
Counter-Clockwise
Decrease CO2 / Increase O2
Using “T40” torques key/bit (fig 10), unscrew, and
remove cap of the gas valve low fire adjustment
(offset) (Fig.11).
d. Adjust low fire screw (offset) clockwise in small
1/10
th
of a turn adjustments until the CO
2
measurement is within the tolerance band but no
greater than 1% CO2 increase than the
combustion reading after throttle adjustment at
low fire (Fig.12). Refer to result recorded in Table
4 – Section 2B.
1% CO
2
= 1.8% less O
2
on Natural Gas
1% CO
2
= 1.5% less O
2
on Propane
CO
2
measurement should be increased no greater
than 1% via low fire adjustment screw (offset)
adjustment from previous reading at low fire Refer
to result recorded in Table 2 Combustion Results
summary (column 2-Low fire.)
e. Record Low Fire CO
2
/O
2
in Table 3 section 3.B.
f. If minimum CO
2
/O
2
is still below allowed
specification tolerance contact triangle tube
technical support. Tel: (856) 228 8881
g.
Operate appliance to High Fire 100% (Fig.6) Record
High Fire CO
2
/O
2
in Table 3 – 3.A).
h. Table 2 Combustion Results summary should be
submitted to Triangle Tube technical support
Cap On Cap Off
Fig .10
Fig .11
Fig .12
Table 4 Low Fire Adjuster (Offset)
Valve responds slowly so
make small
1/10
th
adjustment to the low fire adjustment screw
(offset) and wait for stable combustion reading
before repeating.