Williamson Series 2 - Checkout Procedure

20
Part Number 550-142-785/0812
GWI Series 2 Gas-Fired Water Boilers – Boiler Manual
❏ Boilerandheatdistributionunitslledwithwater?
❏ Automaticairvent,ifused,openonefullturn?
❏ Airpurgedfromsystem?
❏ Airpurgedfromgaspiping?Pipingcheckedforleaks?
❏ Correctly-sized manifold orices installed? See Table 3,
page 6tochecksizeandfueltype.
 Correctly sized manifold orices must be used.
Failure to do so will cause severe personal injury,
death or substantial property damage.
❏ Followed“Operatinginstructions”onboilerorinmanual,page
26forproperstart-up?
❏ Properburnerameobserved?See“Verifyoperation”,manual
Section 7.
❏ Test temperature limit — While burners are operating, turn
BoilerTempadjustmentknobcounterclockwiseuntildisplay
reading is below actual boiler water temperature. Burners
should go off while circulator continues to operate.Turn
BoilerTempadjustmentknobclockwiseuntildisplayread-
ingisaboveboilerwatertemperatureandignitionsequence
should resume.
❏ Test additional eld-installed controls—Ifboiler has a low
water cutoff, additional high limit or other controls, test for
operation as outlined by manufacturer. Burners should be
operatingandshouldgooffwhencontrolsaretested.When
controls are restored, burners should reignite.
❏ Testignitionsystemsafetydevice:
a. Connectmanometertooutletsideofgasvalve.Startboiler,
allowingfornormalstart-upcycletooccurandmainburn-
erstoignite.Withmainburnerson,manuallyshutoffgas
supplyatmanualmainshutoffgasvalve.Burnersshould
gooff.Openmanualmainshutoffgasvalve.Manometer
should confirm there is no gas flow. Pilot will relight, flame
sensing element will sense pilot flame and main burners
reignite.
❏ Setlimitcontrol(s)tosystemtemperaturerequirements.Adjust
balancing valves and controls to provide design temperature
to system.
❏
SetEconomymode,fullyclockwise.
❏ For multiple zones, adjust flow so it is about the same in each zone.
❏ Verifythermostatheatanticipator(ifavailable)setproperly?
See wiring diagram label on boiler or in manual, page 24 and
25.
❏ Cycleboilerwiththermostat—Raisetohighestsettingand
verify boiler goes through normal start-up cycle. Lower to
lowestsettingandverifyboilergoesoff.
❏
CycleDHWAquastatifused.
❏ Measurenaturalgasinput:
a. Operate boiler 10 minutes.
b. Turnoffotherappliances.
c. Atnaturalgasmeter,measuretime(inseconds)required
touseonecubicfootofgas.
d. Calculategasinput:
3600 x 1000
number of seconds from step c
= Btuh
e. Btuhcalculatedshouldapproximateinputratingonboiler
8 Checkout procedure
Check burner flame — Pilot burner
Proper pilot flame (see Figure 16):
1. Blue flame.
2. Innerconeengulngpilotamesensor.
3. Pilot flame sensor glowing cherry red.
Improper pilot flame:
1. Overred — Large ame lifting or blowingpast pilot ame
sensor.
2. Underred—Smallame.Innerconenotengulngpilotame
sensor.
3. Lackofprimaryair—Yellowametip.
Figure 17 Typical main burner ame
Verify operation
Figure 16 Typical pilot burner ame
4. Incorrectlyheatedpilotamesensor.
Check burner flames — Main burner
Proper main burner flame (see Figure 17):
1. Yellow-orangestreaksmayappear(causedbydust).
Improper main burner flame:
1. Overred—Largeames.
2. Underred—Smallames.
3. Lackofprimaryair—Yellowtippingonames(sootingwill
occur).
7 Start-up continued