Harman PC45 - Low Draft Voltage Adjustment; Voltage Adjustment and Testing

19 pC 45 Corn/pellet Stove
3-90-02686R29_05/14
6
4
5
2
3
1
H
L
L
H
( WARNING ) HIGH VOLTAGE
Disconnect power before opening cover.
MAX.
CORN
TEST
POWER
STATUS
DISTRIBUTION
COMBUSTION
BLOWER
BLOWER
FEED MOTOR
IGNITER
6
2
7
1
3
4
5
75°
90°
85°
80°
70°
65°
60°
55°
50°
OFF
R
O
O
M
T
E
M
P
S
T
O
V
E
T
E
M
P
AUTO
MANUAL
IGNITER
F
E
E
D
A
D
J
U
S
T
E
R
P
E
L
L
E
T
O
N
L
Y
C
O
R
N
-
P
E
L
L
E
T
Low Draft Voltage Adjustment
Theseunitsarepre-testedat the factory with exactly120
VAC, 60 Hz. They are checked and adjusted for rebox
tightness, gasket leakage, motor operation and ignitor
operation. The PC 45 is then factory set at a mid-point
adjustmentandinmostcaseswillnotneedanyadjustments.
NOTE: The factory low draft setting may not be correct
for the unit's permanent installation conditions.
ThecontrolboardonthePC45isequippedwithalowdraft
adjustmentport.Locatedonthecontrolfacejusttotheright
oftheigniterlight.Thisvoltageadjustmentisprovidedtoallow
theunittobeadjustedforthehouseholdvoltagewherethe
unitisgoingtobeinpermanentoperation.NOTE:Theline
voltagevariesfromareatoareaandoftenhometohome.
Thelowdraftvoltageshouldbeadjustedtoachievethemost
efcient burn on low burn or "maintenance". This voltage
adjustmentallowstheinstallertochangethelowvoltageset
pointapproximately10volts.Thisadjustmentshouldbedone
bytheinstallerduringsetupbecauseadraftmeterreading
isrequired toinsurepropersetup.
Iftheunitisnotadjustedproperly,itdoesnotcauseasafety
concern.Iftheunitisadjustedtoohigh,onlyefciencyislost.
Iftheunitisadjustedtoolow,thelowdraftpressureswitch
willnotallowthefeedermotorortheignitertooperate.
Asimpledrafttestshouldbeperformedaftercompletingthe
uepipeinstallation.Torecordtheresultsforfuturereference:
CombustionMotorSpeedControl
Lowdraftonlysetpoint.Thesmallstraightscrewdriver
slotisplastic;therefore,theunitcanbeadjustedwhile
inoperation.
Fig. 27
Fig. 28
Low Draft Voltage Adjustment
Draft Test Instructions
1. Attachadraftmetercapableofreadinguptoaminimum
of0.5inchesofwatercolumn(W.C.).
2. Plugtheunit'spowercordintoa120VAC,60Hzgrounded
outlet.
3. Closethehopperlid,front view door, andtheashpan
accessdoor.Neitherfuelorarearerequiredforthistest.
4. Withthemodeselectorinthe"OFF"position,turnthefeed
adjusterto"TEST".
5. Recordthehighdraft_____inW.C.(Normalis-.35to-.55)
ThecontrolwillbeontheHighDraftforaminute.
6. After1minuteisup,thecombustionmotorwillgodownto
lowdraftandthedistributionblowerwillgoonhigh.Allow
approximately 15 seconds to pass for the combustion
motortoslowbeforecheckingthelowdraft.
7. Ifthelowdraftisbetween-.25and-.35,recordthereading
_____ in W.C. If the reading is higher, slowly turn the
setscrewcounter-clockwiseuntilthedraftlowers.Ifthe
readingislower,veryslowlyturnthesetscrewclockwise
untilthedraftincreases.
NOTE: In some cases, the draft may not go as low as
-.25 to -.35 even with the set screw completely counter-
clockwise. This is not a problem. Vertical runs of venting
may add natural draft.
If the draft reading does not drop at all when the test
mode switches from high to low, be sure to check for
restrictions in the appliance air intake.
Draft Meter bolt
hole location
OnaPC45thedraft
holeisundertheleft
rear corner of the
rebox.