Weil-McLain GV90+ Installation And Start-Up Manual page 87

GV90+ Series 2
OAS·FIRED WATER BOILER -
Boiler Manual
Troubleshooting
(continued)
TSTAT/CIRC
and POWER
on
IAWAIVIIIOI Electricalaho<:k hazanl
Whe<over yoo see TURN OFF POWER,
follow
tile Instructions. Faii.Jreto follow
· - Instructions CO<Jid result in sewre
personal
In , dealll or substantial
dama
e.
• This Is NOT a lockout mode.
• The IBC Is sfgnallng that the return water temperature sen-
SOf' ~
detecting
a
temperature less than 40 °F.
• While the temperature at the boler return water terJ1)&(3!ure
senSOf' is less than 40 (IF, both of the Internal bolter
clrcula·
tors wll run QOOUnuously, oven H tllere
Is
no call for heat
(though the boiler will not fire until the thennostat calls for
heat). This operation
Is
Intended to reduce chances
ol
frooz·
ing
during system down times
by
keeping water flowing.
• Altach """"" to pipe wltll clamp
Is rstum water tsmpsrature sensor
c:lamp9d
securs/y to th8 rotum p/p6/n th8 bol/or?
provided.
• I problem persists,
res>~aee
- . .
No
I
Yes
water temperature sensor .
• Retest.
Are both boiler Internal circulators opetaUng?
• R$fllQV$ CIRCULATORS pl\lg (Figvrt
$G,
p;tgt 80, Item 4)
No
I
Yes
from plug receptacle oiiBC.
I
• Place vollmeter leads across tile 120VAC N
and 120 VACH pins of
the
CIRCULATORS receptacle on
tile side corresponding to
tile
circulator not operating.
Does the IOI!moter /n<flcate 120 VAC?
Is there a caN for
heat?
No
Yes
• Verily
by
removing thermostat v.irings at boiler and check·
lng continuity across external wires.
No
I
Yes
!
• Replacellle iBC (IBC).
• Test wire continuity of
• This is normal opetatJon lor • Walt 10 minutes to alow
circu\atOf' wire harness.
• Retest.
Is hamess ok?
water less tnan 40 °F at boll« heat from tile boiler to
lnlemaf return
~· raise the water lefll)9ra·
No
I
Yes
• Condition should change after
lure.
I
a call for
Ilea~
when
tile boiler
Does UMIT tight quit flashing
• Replace cl rculato r harness.
will heat up the water. (and pipes b6gln to heat up)?
• Retest.
No Yes
•
Reconnect ciculator harness to the IBC.
• Boiler
Is
nol heatlng.
-
• Altempl to gel
the
drculator
Slallod
by giving h a sharp rap on tile
• Troubleshoot boiler using
CHART 7, page89.
end ol
the
ciroulalor motor (to release a possibly lod<ed
~le~.
• Hille circulator begins 10 operate, allow It to aperate for a low
minutes to see i the problem clears.
• Boiler sOOuld
now
operate f'l()(fJldy.
• I problem persists,
res>~aeetlle
bypass circulator.
• verily correct sequence ol operation (Figo.re 75, pagell6) .
• Retest.
Part number 550-14-2-783/1012
87