Weil-McLain Series 2 Manual page 86

® S
ERIES
Startup — fi nal checks
Th rottle screw adjustment
ECO 155 ONLY
attempt to adjust the throttle screw unless by
DO NOT
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
elsewhere in this manual or when 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: difficulty igniting, poor flame stability at low fire,
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 4 for location of the
Figure 95 ECO 155 Throttle screw (ONLY for use by a qualifi ed
technician, using calibrated combustion test
instruments)
Throttle adjustment screw
Adjust the throttle screw in small movements.
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. 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
a. If the CO is HIGH, turn the throttle screw CLOCKWISE to
2
lower the input. Allow the boiler to stabilize and take another
reading. Continue until the desired CO
b. If the CO is LOW, turn the throttle screw COUNTERCLOCKWISE
2
to increase the input. Allow the boiler to stabilize and take another
reading. Continue until the desired 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.
86
2
-
G
AS FIRED WATER BOILER
only necessary when specifi ed
throttle screw.
ECO 155
Gas inlet
pressure
reading.
2
value is achieved.
2
value is achieved.
2
— Boiler Manual
(continued)
Figure 96 Acceptable combustion values —
Boiler
Fuel
model
NG
70
LP
NG
110
LP
NG
155
LP
• Values above are with the boiler jacket door
removed. Values will increase about 0.2% once the jacket
door is reinstalled.
REINSTALL
•
service.
• Values above are for altitudes up to 5,500 feet. For higher
altitudes, CO
• Low fi re CO
Re-check the Maximum and Minimum CO
CO rate
test port
1. Turn off the boiler and then turn it back on and put
in Test Mode at maximum. Ensuring the CO
level has remained unchanged and confi rm that CO
is within limits.
2. Reduce to minimum and re-check the minimum rate
output ensuring the CO
unchanged and confi rm that CO is within limits.
3. In the event that the CO
please 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.
measured values must be within the
ranges given below
High fi re
% CO
CO ppm CO
2
9.25 +/– 1.0 < 150 9.25 +/– 1.0
10.0 +/– 0.5 < 150 10.0 +/– 0.5
9.5 +/– 0.5 < 150 9.0 +/– 0.5
10.5 +/– 0.5 < 150 10.0 +/– 0.5
9.25 +/– 1.0 < 150 8.75 +/– 1.0
10.25 +/– 0.5 < 150 9.75 +/– 0.5
the boiler jacket door after completing
may be slightly lower and CO slightly higher.
2
should be equal to or less than High fi re CO
2
setting level has remained
2
and CO cannot be obtained,
2
Part number 550-142-190/1218
Low fi re
% CO
ppm
2
< 50
< 50
< 50
< 50
< 50
< 50
.
2
and
2
setting
2