Weil-McLain GV90+ Installation And Start-Up Manual page 85

GV90+ Series 2
OAS·FIRED WATER BOILER -
Boiler Manual
Troubleshooting
(continued)
PRESS SWITCH & POWER
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.
• Reset boiler control by turning off power at service switch or
• Thermostat should call for
heal
and appropriate zone valves
turning down therrl'lOStat for
at least
45 seconds. open.
Does
bloWlif
motor
operate?
No
I
Yes
Is blow9r wlleel ll.lrnlng at spsed of blow9r
motor?
No
Yes
! !
• Remove BLOWER plug (Figure 93, page SO, Item 3) from
plug receptacle of IBC.
• TURN
OI'F
POWER at • Walt 5 minutes.
• Place voltmeter leads across tile t 20VAC Nand 120VAC H
se<vlce
switch.
Is purge light naslling?
plos of the BLOWER reoeptacle.
• Properly
poslllon
bl- r
No
I
Yes
wheel oo blower motor
Does
the K>ltmeter Indicate 120 VAC?
shaft and tighten set
flt:tOW.
No
I
Yes
(Or replace blower housing
assembly.)
!
• Retest.
• TURN OFF POWER at service
swftch.
Does
I>/OwSr wtJeel tum freely
by
hand?
• Boiler
!lllot.ld be
In nonnal operating se·
I
quence (Fig .. e 75. page 66).
No Yes
• Observe ope<atlon m tlllhennoslatls satJ&.
! ! fied and blower has canpleted its post.
purge c:ycle .
• Ptopert( posl4loo-
• Replace blowe<100tor.
wheel
oo blower
111040<
shaft
and
tllghlen set screw. (Or
(Also
check
blower
replace
blower
housing
housing asserrbly.
• Check oondensate trap.
assembly.)
Replace If necessary.)
Is th6m condensate pt8S9111?
• RetesL
• Retest.
No
Yes
• Remove one of the red wires connected to the pressure
swHch.
Are
vent or
comb<tstlon
air
• Dratl coodensata
• Check continuity across the switch terminals.
pasosagesb/oclced?
• Retest
Does the
ohmmeter Indicate
the
switch Is closed?
I
No
Yes
No Yes
• •
• Replace IBC.
• Check air Pressut8 swllch
pet
page 76.
• Clear passages and recycle bclter.
• Replace
W
necessary.
• Retest.
• Retest.
• Recheck bcller operatloo.
Part number 550-14-2-783/1012
85