Weil-McLain GV90+ Installation And Start-Up Manual page 84

GV90+ Series 2
oAs·FIRED WATER BOILER -
Boiler Manual
Troubleshooting
(cootinuedJ
TSTAT/CIRC & POWER
IAW ARNINBI Eloctrlealshoek hazerd Wherew>r you see TURN OFF POWER, lollow the Instructions. Falure to folow
- · lnstructkwls could result In severe rsonal ln u • death or slbstantlal pro ert dama e.
Is return watBY templlf8tuf8 SlKJSQf c/.amp6d
•
Attach sensor to pipe with clamp provided.
SIJCtlre/y to
t h9
retum
pipe In th8
bcll&r?
•
Folow retl..W'n temperature senSOf'
checking
procedure
Yes
I
No
on page
re.
Replace sensor If
necessary.
+
•
Retest.
• Check for stray voltage on the Incoming thermostat wfres. under any
concfllon, check
and correct the extarnal wiring. (Thb
Disconnect the two external wfres connected to the boUer
Is
a common problem when using 3-wlre zone vatves.)
thermostat wires.
• Once the eldennaJ thermostat circuit wiring Is checked anc
• Conooct
a YOitmeter across
the two
Incoming wires. Close each
cotrect&d
If necessary, reconnect
the
external thermosta
thermostat, zone va.tYe and relay in
the
external circuit one
at
a c1rcu1t wtres to
the
boilef' thermostat wires and
alow
the boile
time
and check the voltmeter reading across
the
wires. Th<>re
to cycle.
shoold NEVER be a voltage reading. If a vonage does occur
Did you find and correct a ~age across th9 two Bxternal thermostat c.itctit wir9S?
Yes
I
No
~
+
• Bolltlr &houkl now OIJ(Irate pm the OOfmat sequence
of
op• Is boller Internal Bypass drc;Uator O(Kiflillng?
oration (Figt.O'e 75, page 66) ff wiring
was
cooected.
No
I
Yes
Remowl CIRCULATORS plug (Figure 93, page SO, Item 4)
I !
•
from plug receptacle oi iBC.
• Check
the boler
Internal return pipe where lt enters
the
•
Place voltmeter leads across
the
right·slde 120 VAC N
and
boler sectloos. The TSTAT/CIRC
and
POWER lights
120VAC H pins ol tile CIRCULATORS receptacle.
will flash after 30 minutes as long as the I'Qturn water
Does the oolt1716ter Indicate 120 VAC?
temperature Is less than 130 °F.
No
I
Yes
• Wait up to 20 minutes to gtve
the
boiler and system a
+ +
chance to respond.
Does
problem persist?
•
Replace IBC (IBC). • Test wire continuity of
No
I
Yes
•
Retest.
circulator wire harness.
L
Is hatn6ss ok?
No
I
Yes
• Soller may
now
be operating normal·
•
Replace circulator harness .
I
ly. Verify against normal sequence of
Retest .
operation (Figure 75, page 66).
•
•
Recoonect circulator harness to IBC .
AHempi io gei ihe cl'cculaior siaried by giving h a sharp rap
• II boiler appears not to be
healing,
troubleshoot boiler
•
per CHART 7, page 89. tl problem cannot be resolved,
on
the
end of the clr;culator motor (to release a possibly
replace watet tempetature sen$()( and retest. Then re·
locked lmpetler).
place IBC (IBC) II sensor does
not
correct
the
prolllem.
•
If
the
circulator begins to operate, alow tt to operate for a
• If
bolkw
is heating,
but the terl'1*'ature
at the
return
few minutes to see if the problem dears.
pt,e does n~ increase
above
130 ~F, there may be an
•
If problem persists, replace the Bypass circulator .
lncorrectly·plped external circulator forcing water ttvot4>
•
Retest .
the boiler. Cll8Ck eldemat
piping
and correct
84
Pan
number
550-142-783/1012