Weil-McLain -230 - Manual (Page 21)

GAS
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FIRED WATER BOILER SERIES
2 — Control Supplement
Part number 550-100-029/0404 21
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
Always disconnect power to boiler before
servicing. Failure to comply could result in
severe personal injury, death or substantial
property damage.
Never jumper (bypass) any device except
for momentary testing as outlined in
Troubleshooting Charts. Severe personal
injury, death or substantial property
damage can result.
Before troubleshooting:
1. Have the following items:
a. Voltmeter that can check 120 VAC , 24 VAC and 12
VDC.
b. Continuity checker.
c. Contact thermometer.
2. Check for 120 VAC (minimum 102 VAC to maximum
132 VAC) to boiler.
3. Make sure thermostat is calling for heat and contacts
(including appropriate zone controls) are closed.
Check for 24 VAC between thermostat wire nuts and
ground.
4. Make sure all external limit controls are either installed
(and closed) or temporarily jumpered for testing.
Check the following:
1 . Wire connectors to control module are securely
plugged in at module and originating control.
2. Gas pressures:
• Maximum: 13" w.c. with no flow (lockup) or with
boiler on
• Minimum: 5" w.c. with gas flowing (verify during boiler
startup with boiler at high fire)
VERIFY PROPER OPERATION AFTER SERVICING.
(see Ultra Boiler Manual for procedures)
Troubleshooting
Always check control module fuses
ALWAYS check control module fuses before
replacing control module or any major
components (blower, etc.). If one of these
fuses is blown, it can prevent control
module or other components from
operating.
1 . Turn OFF power to boiler at external line switch.
2. Remove jacket top front panel (Ultra Boiler Manual,
page 37, item 8).
3. Remove control module cover.
4. Inspect fuses F1 and F3 (located as shown below).
5. The boiler is shipped with two spare fuses attached
to the control module cover.
6. If necessary, replace open fuse (F1 is 5-amp fast-blow;
F3 is 4-amp slow-blow).
Do not jumper fuse or replace with any
fuse except as specified. Failure to comply
could result in severe personal injury, death
or substantial property damage.
7. Install control module cover and jacket top front
cover after fuse inspection.
8. Restore power to boiler at external line switch and
verify boiler operation (Ultra Boiler Manual, pages 23
through 26) after completing boiler service.
Replace boiler jacket front door
Replace boiler jacket front door after servicing. The boiler front 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 door securely fastened
could result in severe personal injury or death.
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