Part number 550-100-090/0809
97
gas
-
fired
water
boiler
—
Boiler Manual
MAINTENANCE & SPECIFICA
TIONS
Annual startup
(continued)
If flame signal still remains low, inspect the vent and air
4.
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
For installations at altitudes above 5,500 feet, make sure the
1.
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.
For installations below 5,500 feet, high altitude should NOT
2.
be enabled.
Use the U-Control display to navigate to Manual test mode
3.
(see Figure 102, page 86).
Set the firing rate to MINIMUM (low fire).
4.
Write down the blower RPM value shown and compare to
5.
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.
Set the firing rate to MEDIUM (ignition rate).
6.
Write down the blower RPM value. It should be within 200
7.
RPM of the value listed in Figure 108.
Set the firing rate to MAXIMUM (high fire).
8.
Write down the blower RPM value. It should be within 200
9.
RPM of the value given in Figure 108.
If any of the values are outside the ranges listed in the previous
10.
steps, contact the factory for technical assistance.
Check flue gas temperature
Set the boiler to high fire. Then adjust the U-Control mod-
1.
ule display to view flue gas temperature and boiler return
temperature.
The flue gas temperature should be no more than 54 °F higher
2.
than the boiler return temperature.
If the flue temperature is higher than this, shut down the
3.
boiler, allow to cool, and follow the procedure starting on
page 109 to clean the heat exchanger.
Firing rates and corresponding blower speeds (low fire, ignition, and high fire) — for altitudes up to 5,500 feet
Figure 108
ULTRA Model
80
105
155
230
299
399
%
RPM Btu/Hr
%
RPM Btu/Hr
%
RPM Btu/Hr
%
RPM Btu/Hr
%
RPM Btu/Hr
%
RPM Btu/Hr
Low fire
Minimum setting
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
Factory setting
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
High 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)
Factory setting
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
High 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 fire
(adjust if desired to match maximum system load — High fire % rate = Max heat load / Boiler output)
Factory setting
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
Maximum setting
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