Troubleshooting - Weil-McLain Series 2 Manual

® S
ERIES

Troubleshooting

Before calling for troubleshooting assistance, fi ll in
the "
ECO Gas Data Collection Sheet
Record the boiler size and CP number (located on the
right side exterior of the boiler jacket).
Failure to adhere to these
guidelines can result in severe
p e r s o n a l i n j u r y, d e a t h o r
substantial property damage.
ELECTRICAL SHOCK HAZARD
TURN OFF ALL POWER TO THE BOILER WHEN
SERVICING . Internal wiring is still powered when
the switch is off.
DO NOT JUMPER DEVICES
Never jumper (bypass) any device except for
momentary testing.
REINSTALL Jacket door
The boiler jacket door must be securely fastened to
the boiler to prevent boiler from drawing air from
inside the boiler room. This is particularly important
if the boiler is located in the same room as other
appliances. Failure to keep the jacket door securely
fastened could result in severe personal injury or
death.
BEFORE SERVICING or
MAKING CONNECTIONS —
ALWAYS TURN POWER OFF TO THE BOILER
TO PREVENT ELECTRICAL SURGES, WHICH
CAN DAMAGE BOILER COMPONENTS.
LABEL WIRES BEFORE
REMOVING
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
" ( page 130 ).
— Boiler Manual
1. See Figure 101 for tools and kits recommended for troubleshooting
ECO boilers.
2. Check for 120VAC (minimum 102VAC to maximum 132VAC)
to boiler.
3. Check the ECO control's last three lockout histories. (Navigate to
the DIAGNOSTICS menus.)
a. See Figure 78, page 70 for navigation instructions and
Figure 87, page 76 for the complete Diagnostics menus.
b. In the DIAGNOSTICS menu, scroll down to ERRORS and
press the enter key.
c. Record the fi rst four data records and then highlight the
history record you want to view.
d. Follow information at the bottom of the screen to navigate
through your lockout histories.
Figure 101
Tools and kits needed for troubleshooting
Tool Purpose
#2 Phillips screwdriver Multiple uses
10 mm wrench To remove heat exchanger cover plate
#20 long-handled Torx To remove burner screws
driver
#T25 Torx driver To remove gas valve
5/16" Nut driver To remove air baffl e
Multimeter Measurements on sensors and electrical components
Manometer Measure the INLET gas pressure to the boiler
(Inclined or digital)
Combustion analyzer Combustion testing and boiler adjustments
(Digital preferred)
Checking surface temperatures of heat exchanger and
Contact thermometer
pipes
Maintenance kit ALWAYS have this kit on hand when performing
maintenance in case replacement is required.
Check the following:
1. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Check for 24VAC between
thermostat wire nuts and ground.
2. Make sure all external limit controls are either installed (and
closed) or temporarily jumpered for testing.
3. Make sure that connectors to ECO control are securely plugged
in at module and originating control.
4. Gas pressures:
• Maximum: 13" (330 mm) w.c. with no fl ow (gas valve lockup
pressure).
• Minimum: must be no less than the minimum values given
on page 21 while operating on high fi re.
95