18-EB41D1-1C-EN
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Maintenance
Owner Maintenance
WWAARRNNIINNGG
EEXXPPLLOOSSIIOONN HHAAZZAARRDD!!!!
TToo pprreevveenntt aann eexxpplloossiioonn oorr ppoossssiibbllee iinnjjuurryy,, ddeeaatthh,,
aanndd eeqquuiippmmeenntt ddaammaaggee.. DDoo nnoott ssttoorree ccoommbbuussttiibbllee
mmaatteerriiaallss,, ggaassoolliinnee,, oorr ootthheerr ffllaammmmaabbllee vvaappoorrss oorr
lliiqquuiiddss nneeaarr tthhee uunniitt..
Some of the periodic maintenance functions of the
packaged unit can be performed by the owner; this
includes replacing the disposable or cleaning the
permanent air filters, cleaning the unit cabinet, and
conducting a general unit inspection on a regular basis.
FFiilltteerrss
WWhheenn tthhee ssyysstteemm iiss iinn ccoonnssttaanntt ooppeerraattiioonn, inspect
the filters at least once each month.
If you have disposable-type filters, replace them with
new filters of the same type and size. DDoo nnoott aatttteemmpptt
ttoo cclleeaann ddiissppoossaabbllee ffiilltteerrss..
Permanent-type filters can be cleaned by washing them
with a mild detergent and water. Make sure that the
filters are thoroughly dry before reinstalling them.
NNoottee:: It may be necessary to replace permanent filters
annually if washing fails to clean the filter or if
the filter shows signs of deterioration. Be sure to
use the same type and size as was originally
installed.
CCoonnddeennsseerr CCooiill
Be sure to keep all vegetation and debris away from the
condenser coil area.
Service Maintenance
Service maintenance should be performed by qualified
service personnel.
CCoooolliinngg SSeeaassoonn
To keep the unit operating safely and efficiently, the
manufacturer recommends that a qualified service
technician check the entire system at least once each
year or more often if needed. The service technician
should examine these areas of the 4YCZ5 unit:
• filters (for cleaning or replacement)
• motors and drive system components (for proper
operation)
• economizer gaskets (for possible replacement)
• safety controls (for mechanical cleaning)
• electrical components and wiring (for possible
replacement and connection tightness)
• condensate drain (for proper sealing and cleaning)
• unit duct connections (to see that they are
physically sound and sealed to the unit casing)
• unit mounting support (for structural integrity)
• the unit (for obvious unit deterioration)
HHeeaattiinngg SSeeaassoonn
Complete the following unit inspections and service
routines described at the beginning of each heating
season.
• Visually inspect the unit to ensure that the airflow
required for combustion and condenser coil is not
obstructed from the unit.
• Inspect the control panel wiring to verify that all
electrical connections are tight and that the wire
insulation is intact.
• Check the operation of the gas ignition system as
follows: Turn off the gas supply with the unit
operating to verify that the gas valve closes and
that a re-ignition cycle is initiated by the unit.
• Visually inspect the inside of the burners and the
burner ports for deposit buildup and corrosion.
Wipe and brush the inside of the burner and the
burner ports and then clean with a dry cloth. If the
deposit buildup or corrosion is excessive, replace
the burners.
MMaanniiffoolldd PPrreessssuurree CChheecckk aanndd AAddjjuusstt
1. Connect a manometer to the pressure tap at the
outlet side of the unit’s gas valve (remove the
Control/Heat access panel). Read the manifold
pressure with the burners firing. See for gas valve
connections.
2. If the manifold pressure reading does not match the
value indicated on the unit's nameplate, the unit's
pressure regulator must be adjusted as follows:
a. Remove the cover screw on the gas
regulator located on the front side of the
unit’s gas valve.
b. Turn the adjusting screw clockwise to
increase manifold pressure or
counterclockwise to decrease manifold
pressure.
3. Check the temperature rise during furnace
operation to insure that it falls within the range
specified on the unit's nameplate.
4. If the temperature rise noted is outside of the
specified limits, adjust the indoor air flow to cause
the temperature rise of the heat exchanger to fall
within the required range.
FFlluuee HHoooodd aanndd CCoommbbuussttiioonn BBlloowweerr CClleeaanniinngg
CCAAUUTTIIOONN
FFiirree oorr EExxpplloossiioonn!!
FFaaiilluurree ttoo ffoollllooww pprrooppeerr pprroocceedduurreess ccaann rreessuulltt iinn
ppeerrssoonnaall iinnjjuurryy oorr sseevveerree eeqquuiippmmeenntt ddaammaaggee
NNeevveerr uussee ccoommbbuussttiibbllee cclleeaanniinngg fflluuiiddss oonn aannyy ppaarrtt
ooff tthhee ffuurrnnaaccee..
UUnniitt SSttaarrttuupp
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