Weil-McLain WM97+110, Руководство пользователя

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Part number 550-142-085/0712
– 91 –
WM97+
gas
-
fired water boiler
— Boiler Manual
Startup — final checks
(continued)
Throttle screw adjustment
WM97+155 ONLY
DO NOT
attempt to adjust the throttle screw unless by a quali-
fied 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 97.
1. Throttle screw adjustment is
only necessary
when specified else-
where in this manual or when combustion tests indicate the need, as
explained under “ ❏
Check flame & combustion with instru-
ments
,” page 88.
2. Boiler behavior that might indicate a need to check combustion values
at high fire (as per page 88) 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 fire and low fire. DO
NOT attempt an adjustment of the throttle screw at low fire. Just check
the combustion values.
4. See Figure 98 for location of the
WM97+155
throttle screw. Remove
the cover screw to access the throttle adjustment screw.
Figure 98 WM97+155
Throttle screw (ONLY for use by a
qualified technician, using calibrated combustion test
instruments)
Throttle adjustment screw
Gas inlet
pressure
test port
Adjust the throttle screw in small movements.
5. See Figure 85, page 77. Make sure the Max firing rate is set to the
maximum given in the table. If not, adjust as necessary. Then navigate
to DIAGNOSTICS — Manual test mode (see Figure 89, page 81) and
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 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 COUNTERCLOCKWISE
to increase the input. Allow the boiler to stabilize and take another
reading. Continue until the desired CO
2
value is achieved.
6. 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. DO NOT adjust throttle on low fire.
7. Consult your local Weil-McLain representative if acceptable results
cannot be obtained for both high and low fire.
Figure 97
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
155
NG 9.25 +/– 1.0 < 150 8.75 +/– 1.0 < 50
LP 10.25 +/– 0.5 < 150 9.75 +/– 0.5 < 50
•
Values above are with the boiler front door
removed
. Values will increase about 0.2% once the
door is reinstalled.
•
REINSTALL
the boiler door after completing service.
• Values above are for altitudes up to 5,500 feet. For higher
altitudes, CO
2
may be slightly lower and CO slightly
higher.
❏
Check exchanger and vent seals
1. Operate the boiler on HIGH fire.
2. Using an inspection mirror, move the mirror
around all heat exchanger joints and vent pipe
connections at the top of the boiler and at the con-
nection to the condensate dish.
3. A leak would appear as vapor on the surface of
the mirror.
4. If there is any indication of a leak at any joint, im-
mediately shut down the boiler.
a. If possible, tighten the retaining screws or nuts
(without over-tightening).
b. If this does not correct the problem, dissassem-
ble the components where the leak appeared.
Use the procedures given in the Maintenance
section of this manual.
c. When disassembling components, inspect
gaskets to see if there is damage. Replace any
damaged gasket.
d. Contact your Weil-McLain representative if the
problem cannot be addressed with the informa-
tion provided in this manual.
5. Condensate dish joint
a. If the inpsection mirror check shows a leak at
the condensate dish-to-heat exchanger joint,
contact your Weil-McLain representative for
instructions to correct the problem.
b. If the mirror test does not reveal a leak at the
condensate dish joint, but there are signs of
weepage or other indications that ther might
be leakage, follow the procedure for checking
the heat exchanger-to-condensate dish seal on
page 109.