3
sorbedfromthe outside air.So, to maintainenergy--efficientopera-
tion,your unit has an automaticdefrost mode.
Thedefrost mode startsat a preset time intervalof 60 minutes, al-
though,it may be reset to 30, 90 or 120 minutes.Defrost will start
atthe presettime only if theice is sufficientto interferewith normal
heatingoperation.
Afterthe ice is melted fromthe co il, or after a maximum of10 m in-
utesindefrostmode, the unit automaticallyswitchesbackto normal
heatingoperation.
Donot be alarmedif steamor fog appearsat the outdoor unitduring
defrostmo de. Watervap or from the melting ice may condense into
amist in the cold outside air.
Duringcertain weatherconditio ns such as heavy snow an d freezing
rainit is not uncom mon for ice to build up on th e unit grille. This is
normalfor theseweather conditions.Do not attemptto removethe
ice from the unit grille. This co ndition will not affect the proper
functionof the unit andwill clear withina few days.
Emergency Heating Mode
Inthe event of primary unitheat failure, theemergency heat mode
allowsyour supplementalheating sourceto keep your home or of-
ficewarmuntilyour unit can be serviced. Contactyour dealerin the
event of primary unit heat failure.
MAINTENANCEAND SERVICE
This sectiondiscusses maintenancethat should be performed by
yourdealerand care you, as theowner, may wish to handlefor your
newunit.
RoutineMaintenance
Allroutine maintenanceshould be handledby skilled, exp erienced
personnel.Yourdealercan helpyou establish astandard procedure.
Toassureproper functioningof the unit, flowof condenser airmust
notb e obstructed from reaching th e unit. Clearance from the top of
theunit is 48 in. (1219 mm). Clearanceof at least36 in. (914 mm)
isrequired on sidesexcept the power entryside (42 in. [1067 mm]
clearance)and th e duct side (12 in. [305 mm] minimu mclearan ce).
Maintenanceand Care for the EquipmentOwner
Before proceeding with those things you mig ht want to maintain
yourself,pleasecarefully considerthe following:
FIRE, EXPLOSION, ELECTRICAL SHOCK, CUT
HAZARD
Failureto followthis warning couldresult in personalinjury,
death or property damage.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
BEFORE SERVICING OR PERFORMING
MAINTENANCEAND INSTALLA LOCK--OUTTAG.
2. W hen removing accesspanels or perfo rming maintenance
functionsinside your unit, be awareof sharp sheet metal
partsand screws.Although specialcare is taken toreduce
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the unit.
!WARNING
AirFilters
Theair filter(s) should be checked every3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce exces-
sivestresson the blower motorand can cause the motor to overheat
andshut down.
This unit must have an air filter in place before it can b e operated.
Thesefilters should be located in atleast one of twoplaces. In man y
applications, the installer will provide return air filter grilles
mountedon the wall or ceiling of the conditioned structure.In the
instanceo f filter grilles, the filters can simply b e removed from the
grillean d replaced.
Theoth er typical application is an accessory filter rack installed in-
side the unit itself. The following info rmation is given to assist in
changing filters used in these internal filter racks.
Table1 indicatesthe correct indoor filter size for your unit. Refer
toFig. 3 to access filters installed in the accessory filter rack. If using
anA ccessory Filter Rack, refer to the Installation Instructions pro-
vided with it for correct filter sizesan d quantities.
Table1—Air F ilters Located Inside Unit
(ForReplacement Purposes)
UnitSize FilterSize in. (mm)
A24 20x20x1(508x508x25)
A30 20x24x1(508x610x25)
A36---A42 24x30x1(610x762x25)
A48---A60 24x36x1(610x914x25)
Toreplace or inspect filters in accessory filter rack:
1. Remov e the filter access panel (See Fig. 3)usin g a 5/16--in.
nutdriver.
2. R emove the filter(s) by pulling it out of the unit. If the filter(s)
isdirty, clean o r replace with a new one.
Wheninstalling thenew filter(s), note the direction ofthe airflow ar-
rowso n the filter frame.
Ifyou have difficulty locating your airfilter(s) o r have questions
concerning proper filter main tenance, contact your dealer for in-
structions.When replacingfilters, always use th e same size and type
offilter th at was supplied originally by the installer.
Access Panels
Filter Access Panel
For Accessory Filter Rack
A09044
Fig. 3 --Accessory Filter Rack AccessPanel
FIREAND UNIT OPERATION HAZARD
Failureto followthis warning couldresult in personalinjury,
death or property damage.
Never operate your unit without filters in place. An
accumulationo f dust and lint on in ternal parts of your unit can
causelo ss of efficiency.
!WARNING
Fans and Fan Motor
Periodically check the condition of fan wheels and housings and
fan--motorshaftbearings.Contactyourdealerfortherequired annu-
almain tenance.
Indoorand Outdoor Coils
Cleaningof thecoils should only be done by qualifiedservice per-
sonnel.Contact your dealerfor the required annualmaintenance.