GASHEATINGSTART-UPPROCEDURE
1.Adjustthermostatsettingseveraldegreesaboveroom
temperatureand set thermostat selector to
EMERGENCYHEATor AUXILIARYHEAT.The
combustionairblowershouldcomeON.
2.Thecombustionairblowerwillrunfor15secondsto
purgethecombustionchamber.
3.Afterthe15secondpurge,thecombustionairblower
willremainon.Thesparkerwillturnontoignitethegas.
Makesurethegasvalveisinthe"ON"position.(Refer
to the instructionslabellocatedon BurnerAccess
Panelofunit.
NOTE:Onacallforheatthesparkerwillremainenergized
for7 secondsor untila flameis detectedbytheflame
sensor.Itmaytakeseveralignitionattemptstopurgethe
airoutofthegaslinesatinitialstart-upoftheunit.
4.30 secondsafter the burnerslight,the circulating
blowerwillbegintorun.
5.ReturnthermostatsystemswitchtoHEAT,
FIRE AND/OR EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Do NOT attempt to light the pilot or burner with a match
or flame of any kind.
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled,
experienced personnel. Your dealer can help you establish
a standard procedure.
For your safety, keep the unit area clear and free of
combustible materials, gasoline, and other flammable
liquids and vapors.
Toassure proper functioning of the unit, flow of combustion
and ventilating air must not be obstructed from reaching
the unit. Clearance of at least 30 in. is required on all sides
except the duct side.
MAINTENANCE AND CARE BY THE
EQUIPMENT OWNER
Before proceeding with those things you might want to
maintain yourself, please carefully consider the following:
• TURN OFF GAS SUPPLY AND ELECTRICAL
POWER TO YOU R UNIT BEFORE SERVICING OR
PERFORMING MAINTENANCE.
• Do not turn off electrical power to this unit without first
turning off the gas supply.
When removing access panels or performing
maintenance functions inside your unit, be aware of
sharp sheet metal parts and screws. Although
special care is taken to reduce sharp edges to a
minimum, be extremely careful when handling parts
or reaching into the unit.
AIR FILTERS - Air filter(s) should be checked at least
every 3 or 4 weeks and changed or cleaned whenever it
becomes dirty. Dirty filters produce excessive stress on the
blower motor and can cause the motor to overheat and
shut down. Table 1 indicates the correct filter size for your
unit.
When installing the new filter(s), note the direction of the
airflow arrows on the filter frame.
If you have difficulty in locating your air filter(s), or if you
have questions concerning proper filter maintenance,
contact your dealer for instructions. When replacing filters,
always use the same size and type of filter that was
supplied originally bythe installer. NEVER OPERATETHE
UNIT WITHOUT FILTERS IN PLACE, FAILURE TO
OPERATE WITHOUT FILTERS COULD RESULT IN
DAMAGE TO THE BLOWER MOTOR AND/OR
COMPRESSOR,
TABLE 1
DDX324040K....
DDX330060K....
DDX336080K....
DDX342080K....
DDX348120K....
DDX360120K....
Filter Data
Disposable Filters Washable Filters'
NominalSize
(qty xw x d)
1 x 20" x 20"
1 x 20" x 24"
2 x 15"x 20"
2 x 18"x 20"
2 x 20" x 24"
2 x 20" x 24"
MinimumArea
(sq. inches)
384
480
576
672
854
960
NominalSize
(qty x wx d)
1x10"x20"
1x12"x20"
1 x 15"x 20"
1 x 18"x 20"
1 x20" x 24"
1 x20" x 24"
MinimumArea
(sq. inches)
192
240
288
336
427
480
Washablefilter size basedon an allowableface velocityof 600 ft/min. Referto
filter manufacturer'sspecificationsfor allowableface velocityand requiredfilter area.
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