Weil-McLain Series 2 Manual page 92

® S
ERIES
Annual startup
Check ignition wiring
1. Check ignition cable electrical resistance. A good cable
will have resistance between 950 and 1050 ohms. Replace
if not acceptable.
2. Inspect boiler ground wire from heat exchanger access
cover to ground terminal screw.
3. Verify all wiring is in good condition and securely
attached.
4. Check ground continuity of wiring using continuity
meter.
5. Replace ground wires if results are not satisfactory.
Check all boiler wiring
1. Inspect all boiler wiring, making sure wires are in good
condition and securely attached.
2. Verify that all connectors are securely inserted.
Check control settings
1. Use the ECO control display to navigate through all
settings. Adjust settings if necessary.
2. Check settings of external limit controls (if any) and
adjust if necessary. Adjust as needed to accommodate
the system design.
Perform startup and checks
1. Start boiler and perform checks and tests specified in
this manual.
2. Verify cold fill pressure is correct and that operating
pressure does not go too high. Adjust water pressure and
expansion tank charge pressure as necessary.
3. Complete the check-out procedure on page 87.
Check low water cutoff service light
(if used)
1. If the low water cutoff amber LED is on, the device requires
service. Follow the low water cutoff manufacturer's
instructions.
Check burner flame
The boiler contains ceramic fiber materials.
Use care when handling these materials per
instructions on page 89 of this manual. Failure
to comply could result in severe personal injury.
1. Inspect flame through observation window using the
procedure on page 82.
2. If flame is unsatisfactory at either high fire or low fire,
check combustion values. If combustion is properly
adjusted, turn off boiler and allow boiler to cool down.
Then remove burner and clean it thoroughly using a
vacuum cleaner or compressed air. Do not use compressed
air to clean burner if performed inside a building.
92
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G
AS FIRED WATER BOILER
(continued)
— Boiler Manual
3. To access the burner, remove the heat exchanger cover plate
following the procedure beginning on pages 105, 108 or 111.
4. If replacing the burner, ensure the burner gasket is in good
condition and correctly positioned. Follow all instructions on
pages 107, 110 or 112 to reinstall all components.
5. Restart the boiler.
6. Inspect the flame at high and low fire. If flame is still not
acceptable, check combustion values. If combustion is properly
adjusted, obtain a replacement burner from Weil-McLain.
Check flame signal
1. Navigate to Diagnostics/Inputs on the ECO control display
(see Figure 78, page 70 for navigation instructions and
Figure 87, page 76 for the complete Diagnostics menus).
2. The flame signal value must be at least 75 for a ECO 70, or at
least 100 for a ECO 110, and at least 160 for the ECO 155. If the
flame signal drops below this level, the ECO control will attempt
to correct by increasing the blower speed to increase flame signal.
Figure 99 Flame signal shutdown values
Model Shutdown
ECO flame signal
70 50
70 HA 50
110 80
110 HA 80
3. A low flame signal may indicate a fouled ignitor or damaged
ignitor insulation.
a. See "Inspect ignition electrode," page 91 to remove and
inspect the ignitor.
b. If required, clean the igniter as instructed.
c. If cleaning the ignitor does not improve, ground wiring is
in good condition, and ground continuity is satisfactory,
replace the ignitor.
4. If flame signal still remains low:
a. Inspect the vent and air piping.
b. Check combustion values.
c. Then inspect the heat exchanger, following the procedures
given in this manual for removal and reinstallation of the
heat exchanger cover plate and other boiler components
(see page 105).
d. Clean the exchanger as described in this manual if necessary.
Model Shutdown
ECO flame signal
155 150
155 HA 150
NOTE: "HA" means high altitude,
5500 feet or more above sea level.
Part number 550-142-190/1218