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Part number 550-100-400/0119
113
Annual startup (continued)
4. If fl ame signal still remains low, inspect the vent and air
piping. Then inspect the heat exchanger, following the proce-
dures given in this manual for removal and reinstallation of
the head exchanger cover plate and other boiler components.
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 fi re 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 115, page 102 ).
4. Set the fi ring rate to MINIMUM (low fi re).
5. Write down the blower RPM value shown and compare to
the value in Figure 121 . The value should no less than the
“Minimum setting” and no higher than the Ignition “Fac-
tory setting” listed. Low fi re rate (and corresponding blower
speed) is adjusted in the boiler setup menu.
6. Set the fi ring rate to MEDIUM (ignition rate).
7. Write down the blower RPM value. It should be within 200
RPM of the value listed in Figure 121 .
8. Set the fi ring rate to MAXIMUM (high fi re).
9. Write down the blower RPM value. It should be within 200
RPM of the value given in Figure 121 .
10. If any of the values are outside the ranges listed in the previous
steps, contact the factory for technical assistance.
Check fl ue gas temperature
1. Set the boiler to high fi re. Then adjust the U-Control mod-
ule display to view fl ue gas temperature and boiler return
temperature.
2. The fl ue gas temperature should be no more than 54 °F higher
than the boiler return temperature.
3. If the fl ue temperature is higher than this, shut down the
boiler, allow to cool, and follow the procedure starting on
page 125 to clean the Nanogate coatedheat exchanger.
Figure 121 irin rates and correspondin loer speeds lo re inition and hih re for altitudes up to feet
% RPM Btu/Hr % RPM Btu/Hr % RPM Btu/Hr % RPM Btu/Hr % RPM Btu/Hr % RPM Btu/Hr
Low fi re
inimum settin
20 1,300 16,000 20 1,300 21,000 20 1,300 31,000 20 1,300 46,000 20 1,400 62,000 20 1,520 79,800
actor settin
33 1,983 26,400 33 1,983 34,650 33 1,983 51,150 33 1,983 75,900 33 2,156 102,300 20 1,520 79,800
ih altitude
33 1,983 26,400 33 1,983 34,650 33 1,983 51,150 33 1,983 75,900 30 1,981 93,000 28 2,002 111,720
Ignition (“Medium” setting in manual test mode)
actor settin
47 2,300 37,600 47 2,300 49,350 47 2,300 72,850 47 2,300 108,100 36 2,330 111,600 33 2,303 131,670
ih altitude
62 3,500 49,600 62 3,500 65,100 62 3,500 96,100 62 3,500 142,600 51 3,202 158,100 40 2,725 159,600
High fi re
(adjust if desired to match maximum system load — High fi re % rate = Max heat load / Boiler output)
actor settin
94 5,200 75,200 94 5,200 98,700 94 5,200 145,700 94 5,200 216,200 96 5,818 297,600 96 6,099 383,040
aimum settin
100 5,500 80,000 100 5,500 105,000 100 5,500 155,000 100 5,500 230,000 100 6,050 299,000 100 6,340 399,000
®
Series 4
gas-fired water boiler — Boiler Manual
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