Install Instructions

Annual startup (continued)
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 condi-
tion 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 82.
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 instruc-
tions.
Check burner flame
The boiler contains ceramic fiber materials. Use
care when handling these materials per instructions
on page 84 of this manual. Failure to comply could
result in severe personal injury.
1. Inspect flame through observation window using the pro-
cedure on page 78.
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.
3. To access the burner, remove the heat exchanger cover plate
following the procedure beginning on page 100 or 103.
4. If replacing the burner, ensure the burner gasket is in good
condition and correctly positioned. Follow all instructions
on page 100 or 103 to reinstall all components.
5. Restart the boiler.
6. Inspect the flame at high and low fire. If flame is still not ac-
ceptable, 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 71, page 66 for navigation instructions and Fig-
ure 80, page 72 for the complete Diagnostics menus).
2. The flame signal value must be at least 75 for a ECO 70 or
110, or 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.
&IGURE
Flame signal shutdown values
Model
%#/
3HUTDOWN
mAMESIGNAL
Model
%#/
3HUTDOWN
mAMESIGNAL
70 50 155 150
70 HA 50 155HA 150
110 50
NOTE: “HA” means high altitude,
5500 feet or more above seal level.
110 HA 50
3. A low flame signal may indicate a fouled ignitor or damaged
ignitor insulation.
a. See “Inspect ignition electrode,” page 86 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 100).
d. Clean the exchanger as described in this manual if neces-
sary.
Part number 550-142-122/0513
87
TM
GAS-FIRED WATER BOILER — Boiler Manual