Weil-McLain Series 2 Manual page 84

® S
ERIES
Startup — fi nal checks
If combustion at either high or low
fire is outside the range given in
Figure 96, page 86 , follow the procedure
given on page 84 or page 86 for adjusting
the throttle screw on the venturi. If throttle
screw adjustment does not correct the
problem, then shut down the boiler
and contact your local Weil-McLain
representative. Throttle screw adjustment
must be done only by a qualifi ed technician,
using calibrated test instruments. Failure
to comply could result in severe personal
injury, death or substantial property
damage.
9. Look at the flame through the flame inspection
window. The low fi re fl ame should be stable and evenly
distributed over burner surface with a uniform orange
color.
10. Repeat the combustion test as instructed in the previous
steps.
11. Use the ECO control display to navigate to Manual test
mode (see Figure 87, page 76 ) and force the fi ring rate
to AUTO (normal operation).
12. Reinstall the flue gas temperature sensor. When
replacing the sensor, remove the rubber grommet from
the probe. Insert the rubber grommet into the fl ue pipe,
then insert the probe into the rubber grommet.
You must reinstall the fl ue gas temperature
sensor to prevent fl ue gas spillage into the
boiler enclosure. Failure to comply could
result in severe personal injury, death or
substantial property damage.
Throttle scr ew adjustment
ECO 70 ONLY
attempt to adjust the throttle
DO NOT
screw unless by a qualifi ed technician, and
with the use of calibrated combustion test
instruments. Adjust the throttle screw only as
needed to meet the combustion values given
in Figure 96 .
1. Throttle screw adjustment is
specifi ed elsewhere in this manual or if combustion
tests indicate the need, as explained under "❏ Check
fl ame & combustion with instruments," page 82.
2. Boiler behavior that might indicate a need to check
combustion values at high fi re (as per page 82 ) to verify
boiler is in adjustment include: diffi culty igniting, poor
fl ame stability at low fi re, combustion noise or high
carbon monoxide values.
3. Combustion readings must be taken at both high fi re
and low fi re. DO NOT attempt an adjustment of the
throttle screw at low fi re. Just check the combustion
values.
4. See Figure 93 for location of the
Adjust the throttle screw in small movements.
Turning the screw too far will cause the
adjustment to reverse behavior.
5. See page 73 and Figure 84, page 74 . Make sure the Max
fi ring rate is set to the maximum given in the table.
84
2
-
G
AS FIRED WATER BOILER
only necessary if
ECO 70 throttle screw.
— Boiler Manual
(continued)
Figure 93 ECO 70
Throttle screw (ONLY for use by a qualifi ed
technician, using calibrated combustion test
instruments)
Throttle adjustment screw
If not, adjust as necessary. Then navigate to DIAGNOSTICS —
Manual test mode (see Figure 87, page 76 ) and force the fi ring rate
to HIGH (high fi re). After the boiler has had time to stabilize, take
a CO reading. If result is not acceptable, do the following:
2
a. Turn the throttle screw either direction very slightly. Allow the
boiler to stabilize and take another CO
CO increases or decreases.
2
b. Turn the screw slightly in the direction needed to increase or
decrease reading as needed. Allow the boiler to stabilize and take
another reading. Continue until CO
6. Lock the boiler into low fi re. Check the combustion readings. If
results are acceptable at low fi re, verify high fi re readings again.
Restore fi ring rate to AUTO. DO NOT adjust throttle on low fi re.
7. Consult your local Weil-McLain representative if acceptable results
cannot be obtained for both high and low fi re.
Re-check the Maximum and Minimum CO
CO rate
1. Turn off the boiler and then turn it back on and put in Test Mode at
maximum. Ensuring the CO
and confi rm that CO is within limits.
2. Reduce to minimum and re-check the minimum rate output
ensuring the CO setting level has remained unchanged and
2
confi rm that CO is within limits.
3. In the event that the CO
contact your Weil-McLain representative.
4. Should you require any assistance during the set up procedure
contact your Weil-McLain representative if the problem cannot be
addressed with the information provided in this manual.
❏ Check ignition system safety shutoff device
1. After the boiler has been installed, turn off the boiler.
2. Shut off the manual gas valve located on the gas line to stop fl ow
of fuel to the boiler.
3. Turn on the boiler. It will start the ignition sequence, but will not
light. After some time, the boiler will lockout, the display screen
will turn red, and the Control will fl ash "Ignition Fault". It means
that the boiler tried to ignite without success for fi ve (5) times
and went into Lockout mode. This means that the ignition system
safety device worked properly.
4. Clear the Lockout condition by selecting "Manual Reset" in the
Diagnostic Menu.
5. Open the manual gas valve located on the gas line to resume fuel
supply to the boiler.
Gas inlet
pressure
test port
reading. Note whether
2
is acceptable.
2
setting level has remained unchanged
2
and CO cannot be obtained, please
2
Part number 550-142-190/1218
and
2