Harman HydroFlex 60 Pellet Boiler - Operation; Control Board Operation; Explanation and Importance of the OverHeat Safety Zone

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3-90-233R24_11/13
Power Light
Indicates power to the control
board. (Ready)
Status Light
Will be lit anytime the unit is
in operation.
Combustion Blower Light
Indicates Power to
combustion blower
Feed Motor Light Indicates
Power to the feed motor.
Max Temp dial
The “Max Temp Dial” is used to set the desired
maximum operating temperature of the boiler.
7 Blinks: Boilerwater overheat safety shut down (220
DegreesF.)Thisrequiresamanualresetbycyclingthemain
poweroffforafewsecondsandre-connect.
Explanation and Importance of the OverHeat Safety Zone
Whenthe unitis operatingat Highburn, andall demand
fromtheheatingsystemstops,thecontrolwillreducethe
feedrateandshutdowncompletelyasnecessary.Thismay
takeseveralminutes,andtheremainingheatmaycausethe
watertemperaturetorisetoover210degreesF.Whenthis
happens,theOVERHEATSAFETYZONElightonthecontrol
willilluminateandtherelayR1isenergized.Thiswillclose
contacts#5and #3(FanContacts on theinterconnection
Page 20), and willalso energize thecontrolled circulator
outlet,forthehotwaterdumpzone.
Whenusingahotwater coil in anairductsystem,ifyou
donotwantthelivingspaceheatedbeyondthethermostat
settingduringanoverheatdump,analternatedumpzone
willneedtobeinstalledandsomeinternalcontrolre-wiring
willbenecessary.
Feed adjuster
Sets the maximum feed rate
Test
Combustion blower, feed
motor and safety dump
zone are fully energized for
the first minute. Then, the
combustion blower will stay
on low.
Overheat Safety Zone Light
Indicates that the boiler water
temperature has reached
210 Degrees F.
Igniter Light
Indicates power to the igniter
Lighting Mode Selector
Switched between Auto and
Manual lighting.
Mode Selector/Min Temp
Dial
Used to turn the boiler on or off
and set the desired minimum
operating temperature of the
boiler.
Status light error messages:
3 Blinks:IndicatesthattheESP(ExhaustSensingProbe)
hasgoneoutofrangetoomanytimes.Iftheunitisoperating
correctly,performamanualresetbycyclingthemainpower
offatthecircuitbreakerforafewseconds.Ifthe3blinks
persist, contact your service technician.
4 Blinks:Indicatesmis-communicationwiththeaquastat,or
theaquastatisnotattachedproperly.Mayrequireamanual
reset(turnoffpoweratcircuitbreaker).Notethatinsome
optionalcontrolmethods,thisstatuswilloccurduringnormal
operationandresetautomatically.
5 Blinks:(InAutoLightModeOnly)
Indicatesthattheigniterhasfailedtolightthereafter40
Minutes.Toreset-TurntheModeSelector/Min.Temp.to
OFFandthenbacktothedesiredtemperature.
6 Blinks:Indicatesthatthecontrolhascalculatedpooror
incompletecombustionoccurringfor25ormoreminutes.
Asixblinkstatusmayoccurifthestoveisallowedtorunout
ofpellets.Toreset,turnModeSelector/MinTempdialto“OFF”
thenbackontothedesiredtemperature.Iftheunitwasnot
outofpellets,seeTroubleshootingsectionformoredetails.
Diagnostic Port
For maintenance only.
Requires special DDM
monitor supplied to trained
technicians exclusively.
Operation
Label from unit control panel showing outlets