Combustion Check And Fuel Input Rate; Safety Check - Slant/Fin LYNX LX-85A Installation And Operating Instructions Manual

National Excelsior Company
www.excelsiorhvac.com
IV. Check combustion and fuel input rate
Warning: Only a trained and qualified service technician must
do the adjustment to the input of the boiler.
A. Remove the boiler jacket front panel by turning the black
screws 1/4 turn to the open position. Lift off the panel.
B. Start and run the boiler in the "System Test" mode in the
"VIEWING AND CHANGING SYSTEM SETTING" menu.
Refer to table 5 on page 33. Use the ! or " push button to
choose first the high (alternating S-H on mode display) and
then the low (alternating S-L on mode display) firing rate.
C. Check the fuel input rate on the gas meter (for natural gas
boilers).
BTUH INPUT= cu.ft. metered in 3 minutes X heating value of
the gas* X 20
*The higher heating value of the gas can vary for different
localities. Consult the gas supplier for this value in
BTU/cu.ft.
If the fuel input is not at the rate specified on page 2 at the high
or low firing rate, then the blower speed should be adjusted to
attain the specified input rate. This can be done by using the
"Change blower RPM for high or low input" mode in the
"VIEWING AND CHANGING SYSTEM SETTING" menu.
Refer to Table 5 on page 33. Increasing the blower RPM will
increase the fuel input rate, and decreasing the blower RPM
will decrease the fuel input rate.
D. Measure the CO and CO2 of the flue gas at high and low
firing rate using a calibrated combustion test instrument. A
flue sample port is provided in the vent pipe (See Figure 2
on page 3). The CO should not exceed 100 PPM at high
input and 50 PPM at low input when the combustion is
correct. The CO2 should be in the range listed in Table 6.
Firing
Fuel
Rate
High
Natural
Gas
Low
High
Propane
Low
E. If the combustion (CO2 and CO measurement) at either
high or low input rate is out of the range, shut down the
boiler and contact Slant/Fin Tech. service department at
1-800-873-4346.
Warning: Failure to comply with the above mentioned
requirement might result in property damage,
personal injury or loss of life.
CO2%
Minimum Nominal Maximum
9.2 9.5 9.8
8.5 8.8 9.1
10.7 11.0 11.3
9.7 10.0 10.3
Subject to change without notice.
F. Exit the "System Test" mode (Push "ENTER" button).
V. SAFETY CHECK
A. Check for gas leaks:
Using soap solution, check for gas leaks from meter to gas
valve including all pipes and fittings and gas valve
connections. Use liquid soap solution for all gas testing. DO
NOT use open flame.
B. Thermostat Test:
Set thermostat setting to low enough to end call for heat.
Gas valve should close and burner should stop firing.
Blower and circulator pump should go into a post purge,
then shut off.
C. Control Safety Shutdown test:
With the burner firing, disconnect the spark cable from the
spark ignitor. Gas valve should close and burner should
stop firing. The boiler will try for ignition three times after
this, then should lock out with an "A 01" error shown on the
display. Reconnect the spark cable to the spark ignitor, and
press the "Reset" button to return to normal operation.
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