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Troubleshooting Chart for BSI Boilers Equipped with
McDonnell & Miller #67 Low Water Cut-offs and Vent Dampers
Caution
: Read page 34 before attempting to use this chart
Is there an audible
click as R8225 relay
pulls in w hen the
thermostat calls for
heat?
Does relay
pull in now ?
Vent
damper
open?
START
Thermostat
calls for heat
24 volts across
blue and yellow
w ires inside
junction box?
120 volts across
black and w hite
transformer
leads?
*
Pow er off
*
Blow n fuse or
tripped
breaker
*
Misw ired or
loose 120 volt
connection
N
Y
*
Defective
transformer
See Note #6 on
page 34
N
Y
*
Bad connection in
thermostat w iring
*
Defective thermostat
*
Thermostat misw ired or
misapplied
N
N
24 volts
betw een terminal #
1
on 67 LWCO and
yellow tranformer
connection?
24 volts present
betw een each
pressure limit
connection and
yellow transformer
connection?
*
Boiler off on pressure limit
*
Defective pressure limit
Is 24 volts
present across
brow n and
yellow leads on
R8225 relay?
Disconnect
thermostat and
temporarily jump
boiler thermostat
connections
together
*
Loose
connection
betw een
transformer
and R8225
coil
*
Defective
R8225
See Note #7
on page 34
*
Boiler off on low w ater
24 volts present
across blue lead on
R8225 and yellow
transformer leads?
*
Defective R8225
Y
Y
N
N
Y
Y
Y
N
N
Y
Y
N
Содержание BERMUDA BSI069
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Страница 49: ...49 48 FIGUREA1 BASE HEATEXCHANGER FLUE COLLECTORASSEMBLY...
Страница 51: ...51 50 FIGUREA2 JACKETINSTALLATION...
Страница 53: ...53 52 FIGUREA3 TAPPING LOCATIONS SEE TEXT FOR TAPPING USES...