Troubleshooting; Verify Proper Operation After Servicing; Necessary Checks - Weil-McLain ULTRA ULTRA-105 Service Manual

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GAS FIRED WATER BOILER SERIES

Troubleshooting

VERIFY PROPER OPERATION AFTER SERVICING

Re-install BOILER JACKET FRONT DOOR AFTER SERVICING
Re-install 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.
when servicing controls. Wiring errors
can cause improper and dangerous opera-
tion. Always disconnect power to boiler
before servicing. Failure to comply could
result in severe personal injury, death or
substantial property damage.
cept for momentary testing as outlined in
Troubleshooting tables. Severe personal
injury, death or substantial property dam-
age 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 maxi-
mum 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 dur-
ing boiler startup with boiler at high fire)
22
1 & 2
(see Ultra Boiler Manual for procedures)
prior to disconnection Always check control module fuses
1.
ex-
2.
3.
4.
5.
6.
7.
8.
—
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.
Turn OFF power to boiler at external line switch.
Remove jacket top front panel (Ultra Boiler Manual, page 37, item 8).
Remove control module cover.
Inspect fuses F1 and F3 (located as shown below).
The boiler is shipped with two spare fuses attached to the control
module cover.
slow-blow).
Do not jumper fuse or replace with any fuse except as speci-
fied. Failure to comply could result in severe personal injury,
death or substantial property damage.
Install control module cover and jacket top front cover after fuse in-
spection.
Restore power to boiler at external line switch and verify boiler operation
(per Ultra Boiler Manual procedures) after completing boiler service.
Part number 550-100-029/0810