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Bobcat Models B-120A and B-200A
38
4. If the fuel input is not at the rate specified on page 2
at the minimum 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 low input” mode in the “View and Changing
System Setting” menu. Refer to Table 5 on page 32.
I
ncreasing the blower rpm will increase the fuel input
rate, and decreasing the blower rpm will decrease the
fuel input rate.
D. Exit the “System Test” mode, once the combustion and fuel
input rate has been checked and adjusted, if necessary.
Refer to Table 5 on page 32.
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
s
top 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.
VI. DIAGNOSTIC ERROR CODES
WARNING:
Only a trained, experienced service technician
should perform troubleshooting. Turn off all electric power to the
boiler before service.
A. LOCKOUT ERRORS: Indicated by an “A” in the mode display. The reset button must be pressed to clear the error
and retry operation.The temperature display shows the error code.
ERROR CODE INDICATION REMEDY
01
Ignition Failure - 3 unsuccessful
ignition attempts in a row.
Check for steady sparking at electrodes. If spark not
steady - check spark gap to be .125”, clean or replace
spark ignitor, check power supply voltage and grounding.
If spark is steady - check for proper gas supply pressure.
Check combustion, if able to ignite, or replace gas valve.
02
Flame Failure - 3 losses of flame
signal dur
ing one demand.
Check for proper combustion, at both max. and min.
input fir
ing rates. If combustion is within the range
specified in Table 6 on page 36, clean or replace spark
ignitor, check power supply voltage and grounding.
03
Water High Limit Open
Check to see if the water outlet temperature reaches
203˚F. If it does, replace the water outlet 12k ohm
sensor. If it does not, replace the water high limit switch.
04,
05, 09, 10,
12, 13, 14, 15,
16, 18, 32
Control Failure
Replace control board. Make sure the proper boiler
model selection and confirmation code is entered.
See
Table 5 on page 32.
19, 20
Flame Detected at
Wrong Time
If a flame is still observed after a call for heat is stopped,
replace the gas v
alve
.
If the burner seems to be shutting
down properly, replace the spark ignitor.
33
F
an Failure - RPM error
Check wire harness connections going to the blower.
Replace blower.