Weil-McLain WM97+ Aqua Logic, Руководство пользователя

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Part number 550-142-058/0811
73
WM97+
gas
-
fired water boiler
— Boiler Manual
Startup — final checks
(continued)
7. Measure natural gas input:
a. Operate boiler 10 minutes. Turn off other appliances.
b. At natural gas meter, measure time (in seconds) required to
use one cubic foot of gas.
c. Calculate gas input:
d. Btuh calculated should approximate input rating on boiler
rating label.
8. Use the control module display to navigate to Manual test mode
(see Figure 69, page 64) and force the firing rate to MIN (low fire).
9. Look at the flame through the flame inspection window. The low
fire flame 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 control module display to navigate to Manual test mode
(see Figure 69, page 64) and force the firing 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 flue pipe, then insert the probe into the
rubber grommet.
You must reinstall the flue gas temperature sensor to
prevent flue gas spillage into the boiler enclosure. Failure
to comply could result in severe personal injury, death
or substantial property damage.
Throttle screw adjustment procedure
See Figure 76 for location of the throttle screw. Remove the cover screw
to access the throttle adjustment screw.
DO NOT attempt to adjust the throttle screw unless by
a qualified 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 77.
1. This procedure is only necessary when specified elsewhere in this
manual or when combustion tests indicate the need, as explained
under “ ❏
Check flame & combustion with instruments
,”
page 71.
2. Boiler behavior that might indicate a need to check combustion
values at high fire (as per page 71) to verify boiler is in adjustment
include: difficulty igniting, poor flame stability at low fire, combus-
tion noise or high carbon monoxide values.
3. Combustion readings must be taken at both high fire and low fire.
DO NOT attempt an adjustment of the throttle screw at low fire.
Just check the combustion values.
4. Use the control module display to navigate to Manual test mode
(see Figure 69, page 64). Force the firing rate to MAX (high fire).
After the boiler has had time to stabilize, take a CO
2
reading.
a. If the CO
2
is HIGH, turn the throttle screw COUNTER-
CLOCKWISE to lower the input. Allow the boiler to stabilize
and take another reading. Continue until the desired CO
2
value is achieved.
b. If the CO
2
is LOW, turn the throttle screw CLOCKWISE to
increase the input. Allow the boiler to stabilize and take another
reading. Continue until the desired CO
2
value is achieved.
Figure 76 Throttle screw location (ONLY for
use by a qualified technician, using
calibrated combustion test instruments)
Throttle adjustment screw
Adjust the throttle screw in small movements.
Turning the screw too far will cause the adjust-
ment to reverse behavior (CO
2
would increase
with counterclockwise rotation or decrease
with clockwise rotation.)
Figure 77
Acceptable combustion values —
measured
values must be within the ranges
given below
Boiler
model Fuel
High fire Low fire
%CO
2
CO ppm %CO
2
CO ppm
70
NG 9.25 +/– 1.0 < 150 9.25 +/– 1.0 < 50
LP 10.0 +/– 0.5 < 150 10.0 +/– 0.5 < 50
110
NG 9.25 +/– 1.0 < 150 9.25 +/– 1.0 < 50
LP 10.0 +/– 0.5 < 150 10.0 +/– 0.5 < 50
• Values above are with the boiler front door removed. Values
will increase about 0.2% once the door is reinstalled.
• Values above are for altitudes up to 5,500 feet. For higher
altitudes, CO
2
may be slightly lower and CO slightly higher.
5. Lock the boiler into low fire. Check the combustion
readings. If results are acceptable at low fire, verify high
fire readings again. Restore firing rate to AUTO.
6. Consult your local Weil-McLain representative if ac-
ceptable results cannot be obtained for both high and
low fire.
❏
Adjust and test boiler controls
1. Follow instructions in this manual to set and verify
operation of the boiler controls.
2. Follow low water cutoff manufacturer’s instructions.