Check Flue Gas Temperature - Weil-McLain Ultra 3 series User Manual

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gas fired water boiler
Annual startup
4. If flame signal still remains low, inspect the vent and air
piping. Then inspect the heat exchanger, following the pro-
cedures given in this manual for removal and reinstallation
of the head exchanger cover plate and other boiler compo-
nents. Clean the exchanger as described in this manual if
necessary.
Check blower speeds
1. For installations at altitudes above 5,500 feet, make sure the
control is set up for high altitude in the boiler setup menu.
The U-Control module automatically adjusts low fire and
ignition rates to compensate for high altitude conditions.
2. For installations below 5,500 feet, high altitude should NOT
be enabled.
3. Use the U-Control display to navigate to Manual test mode
(see Figure 102, page 86).
4. Set the firing rate to MINIMUM (low fire).
5. Write down the blower RPM value shown and compare to
the value in Figure 108. The value should no less than the
"Minimum setting" and no higher than the Ignition "Fac-
tory setting" listed. Low fire rate (and corresponding blower
speed) is adjusted in the boiler setup menu.
Figure 108
Firing rates and corresponding blower speeds (low fire, ignition, and high fire) — for altitudes up to 5,500 feet
ULTRA Model 80
% RPM Btu/Hr
Minimum setting 20 1,300 16,000
Factory setting
33 1,983 26,400
High altitude 33 1,983 26,400
Factory setting 47 2,300 37,600
High altitude 62 3,500 49,600
High fire
(adjust if desired to match maximum system load — High fire % rate = Max heat load / Boiler output)
Factory setting 94 5,200 75,200
100 5,500 80,000
Maximum setting
Part number 550-100-090/0809
— Boiler Manual
(continued)
105 155
% RPM Btu/Hr % RPM Btu/Hr
Low fire
20 1,300 21,000 20 1,300 31,000
33 1,983 34,650 33 1,983 51,150
33 1,983 34,650 33 1,983 51,150
Ignition
("Medium" setting in manual test mode)
47 2,300 49,350 47 2,300 72,850
62 3,500 65,100 62 3,500 96,100
94 5,200 98,700 94 5,200 145,700
100 5,500 105,000 100 5,500 155,000 100 5,500 230,000 100 6,050 299,000 100 6,340 399,000
6. Set the firing rate to MEDIUM (ignition rate).
7. Write down the blower RPM value. It should be within 200
RPM of the value listed in Figure 108.
8. Set the firing rate to MAXIMUM (high fire).
9. Write down the blower RPM value. It should be within 200
RPM of the value given in Figure 108.
10. If any of the values are outside the ranges listed in the previous
steps, contact the factory for technical assistance.

Check flue gas temperature

1. Set the boiler to high fire. Then adjust the U-Control mod-
ule display to view flue gas temperature and boiler return
temperature.
2. The flue gas temperature should be no more than 54 °F higher
than the boiler return temperature.
3. If the flue temperature is higher than this, shut down the
boiler, allow to cool, and follow the procedure starting on
page 109 to clean the heat exchanger.
230
% RPM Btu/Hr %
20 1,300 46,000 20
33 1,983 75,900 33
33 1,983 75,900 30
47 2,300 108,100 36
62 3,500 142,600 51
94 5,200 216,200 96
299 399
RPM Btu/Hr % RPM Btu/Hr
1,400 62,000 20 1,520 79,800
2,156 102,300 20 1,520 79,800
1,981 93,000 28 2,002 111,720
2,330 111,600 33 2,303 131,670
3,202 158,100 40 2,725 159,600
5,818 297,600 96 6,099 383,040
97