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Part number 550-100-260/0520
115
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
32
34265 37871
90
8504 9399
150
2517 2782
40
27834 30764
100
6847 7568
160
2091 2311
50
21630 23907
110
5545 6129
170
1744 1928
60
16944 18727
120
4517 4992
180
1461 1615
70
13372 14780
130
3698 4088
190
1229 1359
80
10629 11747
140
3043 3364
200
1038 1147
Troubleshooting (continued)
Check control fuses
ALWAYS check control fuses before replacing the
control or any major components (blower, etc.).
If one of these fuses is blown, it can prevent the
control or other components from operating.
1. Turn OFF power to boiler at external line switch. Then
remove the control access door.
2. Locate fuses using Figure 102.
3. Remove and inspect the seven (7) fuses (Items 1, 2, and 3,
Figure 102).
4. If necessary, replace one or more of the fuses:
a. Low voltage circuit fuse (Item 1) is a 3-amp 24VAC
fast-blow (Littelfuse 0287003).
b. Line voltage circuit fuses (Item 2) are 2.5-amp
120VAC fast-blow (Littelfuse 032602.5).
c. Line voltage circuit fuses (Item 3) are 4-amp 120VAC
fast-blow (Littelfuse 314004).
Do not jumper either fuse or replace with any fuse
except as specified. Failure to comply could result
in severe personal injury, death or substantial
property damage.
5. Reinstall the control access cover.
Checking temperature sensors
1. The boiler temperature sensors (Boiler In, Boiler Out, DHW
Out, Flue, Outdoor, and System Supply/Return) are all
resistance-type devices. Figure 101 shows the correct value
for the sensor at various temperatures. For dual sensors,
the temperature difference between the sensors must be no
more than 10°F.
2. Use the resistance values at 32°F, 60°F, 70°F and 212°F to
measure the sensor resistance at known temperatures (ice
point, room temperature and sea level boiling point). For
ice point and boiling point, insert the sensor in water at that
temperature. Use an ohmmeter to read resistance value.
3. To check whether the control is correctly sensing temperature,
you can use a resistance decade box. Connect the decade box
temporarily in place of a sensor and read the corresponding
temperature on the control display. The temperature should
be close to the value corresponding to the input resistance.
Sensor resistance values
Control fuses
2
1 Fuse
3-Amp
24VAC
1
1 Fuse
4-Amp
120VAC
3
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