Throttle Screw Adjustment Procedure; Adjust And Test Boiler Controls - Weil-McLain ULTRA ULTRA-105 Service Manual

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GAS FIRED WATER BOILER SERIES
Combustion testing and adjustment

Throttle screw adjustment procedure

See Figure 22, page 38, or Figure 23, page 39, for location of the
throttle 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 24.
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 38."
2. Initiate a call for heat on one of the heat demand inputs.
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. Press and hold both the Ultra control panel "Mode" and "+" but-
tons simultaneously until "H" appears.
5. The "H" in the first digit of the display means the boiler will operate
at high fire when the blower speed reaches maximum.
6. 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 COUNTERCLOCK-
2
WISE to increase the input. Allow the boiler to stabilize and
take another reading. Continue until the desired CO
achieved.
7. Press and hold the Ultra control panel "Mode" and "-" buttons
simultaneously until the display shows "L".
8. The "L" in the first digit means the boiler will operate at low fire
when the blower speed reaches minimum.
9. Check the combustion readings.
a. If results are acceptable at low fire, verify high fire readings
again. Then press and hold the "+" and "-" buttons to return
boiler to automatic firing.
b. If results are not acceptable, shut down the boiler. Contact your
Weil-McLain representative immediately.
You must re-install 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.
40
—
1 & 2
reading.
2
value is achieved.
2
value is
2
1.
(continued)
Acceptable CO
2
CO / O values must be within 1.0% of the
2 2
values listed below —
2
NG 8.6
Ultra-80
LP 9.6
NG 9.0
Ultra-105
LP 10.1
NG 9.0
Ultra-155
LP 10.0
NG 9.0
Ultra-230
LP 10.0
NG 9.0
Ultra-310
LP 10.0
NOTICE: CO values should measure less than 60 PPM.
2
Re-install boiler jacket front door after servic-
ing. The boiler front door must be securely
fastened to the boiler to prevent boiler from
drawing air from inside the boiler room.
This is particularly important if the boiler is
located in the same room as other appliances.
Failure to keep the door securely fastened
could result in severe personal injury or
death.

Adjust and test boiler controls

Follow instructions in the Ultra Boiler manual to set
and verify operation of the boiler controls.
Part number 550-100-029/0810
/ O and CO values:
2
2 2 2
5.8 7.8 7.2
6.4 8.6 7.8
5.0 8.4 6.2
5.5 9.2 7.0
5.0 8.0 6.8
5.6 8.5 8.0
5.0 8.0 6.8
5.6 9.0 7.2
5.0 8.0 6.8
5.6 9.0 7.2