Laars Mascot II, Installation And Operation Instructions Manual

Page: 33 / 52

Mascot II Boilers and Water Heaters
Page 33
proper gas supply. Wait 5 minutes and start the
unit again.
5. Turn Mascot II on.
6. After placing the appliance in operation, the
Burner Safety Shutoff Device must be tested
:
(a) Close gas shutoff valve with burner operating.
(b) Flame will go out and blower will continue to
run for the post purge cycle. One or three
additional attempts to light will follow
including pre-purge, ignitor on, valve/flame on
and post purge. Ignition will not occur as the
gas is off. The ignition control will lockout.
(c) Open gas shutoff valve. Reset the boiler
control by pressing the
RESET
button on the
control or on the display. Restart the
appliance. The ignition sequence will start
again and the burner will start. The appliance
will return to its previous mode of operation.
Caution
Should any odor of gas be detected, or if the gas
burner does not appear to be functioning in a normal
manner, CLOSE MAIN SHUTOFF VALVE. Do not
shut off switch. Contact your heating contractor, gas
company, or factory representative.
10.2.2 Boiler Setup and Adjustment
1. Measure the CO
2
in the flue products at high fire.
The Mascot II can be forced to high fire to allow
for easier setup. Refer to
Section 8.1, Table 11 for
instructions on how to access the forced rate menu.
The CO
2
readings should be between the values
shown in Table 13 . If the CO
2
is not within the range
shown, adjustments may be made. To adjust the high
fire CO
2
, locate the high fire adjuster screw according
to the appropriate figure. Slowly make adjustments in
1/16 of a revolution increments until the CO
2
is
within the range identified.
2. Measure the CO
2
/O
2
in the flue products at low
fire. Mascot II can be forced to low fire to allow
for easier setup. Refer to
Section 8.1, Table 11 for
instructions on how to access the forced rate menu.
CO
2
readings should be between the values shown
in Table 13 . If the CO
2
is not within the range
shown, adjustments may be made. To adjust the
low fire CO
2
, locate the low fire adjuster screw
according to the appropriate figure. Slowly make
adjustments in 1/16 of a revolution increments
until the CO
2
is within the range identified (see
Figure 25 ).
3. Repeat steps 1 and 2 to confirm that the CO
2
ranges are within the required ranges. Adjust if
necessary.
4. If any of the measurements cannot be adjusted
to the specified ranges or the CO levels are
above 150ppm when adjusted please consult the
factory for further information.
WARNING
Improper adjustment may lead to poor combustion
quality, increasing the amount of carbon monoxide
produced. Excessive carbon monoxide levels may
lead to personal injury or death.
10.3 Shutting Down Mascot II
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. If freezing is anticipated, drain Mascot II and be
sure to also protect building piping from freezing.
All water must be removed from heat exchanger
and condensate trap or else damage from freezing
may occur.
This step to be performed by a qualified service person.
10.4 To Restart Mascot II
If drained, follow Section 10.1 in this manual
for proper filling and purging.
1. Turn off the main electrical disconnect switch.
2. Close all manual gas valves.
3. WAIT FIVE (5) MINUTES.
4. Set the aquastat or thermostat to its lowest setting.
5. Open all manual gas valves.
6. Reset all safety switches (pressure switch, manual
reset high limit, etc.).
7. Set the temperature controller to the desired
temperature setting and switch on electrical power.
8. Burner will go through a prepurge period and
ignitor warm-up period, followed by ignition.