NOTE:Installafilterdrierwheneverthesystemhasbeenopened
forrepair.
3.AddasmallchargeofR-22refrigerantvaportosystemand
leak-testunit.
4.Recoverrefrigerantfromrefrigerantsystemandevacuateto
500micronsifnoadditionalleaksarefound.
5.ChargeunitwithR-22refrigerant,usingavolumetric
chargingcylinderoraccuratescale.Refertounitratingplate
forrequiredcharge.Besuretoaddextrarefrigerantto
compensateforinternalvolumeoffilterdrier.
STEP2--START-UPHEATINGANDMAKEADJUST-
MENTS
Completetherequiredproceduresgivenin thePre-Start-Up
sectionbeforestartingtheunit.Donotjumperanysafetydevices
whenoperatingtheunit.Makesurethatburnerorificesareproperly
aligned.Unstableoperationmyoccurwhentheburnerorificesin
themanifoldaremisaligned.
Followthelightinginstructionsontheheatingsectionoperation
label(locatedinsidetheburnerorbloweraccessdoor)tostartthe
heatingsection.
NOTE:Makesurethatgassupplyhasbeenpurged,andthatallgas
pipinghasbeencheckedforleaks.
LOWVOLTAGE
SPLICE BOX
J
CHECK HEATING CONTROL
Start and check the unit for proper heating control operation as
follows (see furnace lighting instructions located inside burner or
blower access panel):
1. Place room thermostat SYSTEM switch in the HEAT
position and the fan switch is placed in AUTO position.
2. Set the heating temperature control of the thermostat above
room temperature.
3. The induced-draft motor will start.
4. After a call for heating, the main burner should light within
5 sec. If the burners do not light, there is a 22-sec. delay
before another 5-sec. try. If the burners still do not light, this
sequence is repeated. If the burners do not light within 15
minutes from the initial call for heat, there is a lockout. To
reset the control, break the 24-v power to W.
5. The evaporator fan will turn on 45 sec. after the flame has
been established. The evaporator fan will turn off 45 sec.
after the thermostat has been satisfied.
CHECK GAS INPUT
Check gas input and manifold pressure after unit start-up (See Table
3). If adjustment is required proceed as follows:
• The rated gas inputs shown in Table 3 are for altitudes
from sea level to 2000 ft above sea level. These inputs are
based on natural gas with a heating value of 1050 Btu/ft 3
at 0.65 specific gravity, or propane gas with a heating
value of 2500 Btu/ft 3 at 1.5 specific gravity.
• For elevations above 2000 ft (610 m), reduce input 4%
for each 1000 ft (305 m) above sea level. For example at
2001 ft (610 m) a 12% total derate is required.
• When the gas supply being used has a different heating
value or specific gravity, refer to national and local codes.
or contact your distributor to determine the required
orifice size.
MANIFOLD I_IPEPLUG
Fig. 13 - Burner Assembly
A07568
BURNER FLAME
Fig. 14 - Monopoly Burner
C99021
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit and/or
component life.
Do Not redrill an orifice. Improper drilling (burrs,
out-of-round holes, etc.) can cause excessive burner noise
and misdirection of burner flame. If orifice hole appears
damaged or it is suspected to have been redrilled, check orifice
hole with a numbered drill bit of correct size.
ADJUST GAS INPUT
The gas input to the unit is determined by measuring the gas flow
at the meter or by measuring the manifold pressure. Measuring the
gas flow at the meter is recommended for natural gas units. The
manifold pressure must be measured to determine the input of
propane gas units.
Measure Gas Flow (Natural Gas Units)
Minor adjustment to the gas flow can be made by changing the
manifold pressure. The manifold pressure must be maintained
between 3.4 and 3.6 in. wc.
If larger adjustments are required, change main burner orifices
following the recommendations of national and local codes.
NOTE: All other appliances that use the same meter must be turned
off when gas flow is measured at the meter.
Proceed as follows:
1. Turn off gas supply to unit.
13
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