22
CAUTION
S
HEEt
MEtal
PaRtS
,
ScREWS
,
clIPS
and
SIMIlaR
ItEMS
InHEREntly
HavE
SHaRP
EdGES
,
and
It
IS
nEcESSaRy
tHat
tHE
InStallER
and
SERvIcE
PERSonnEl
ExERcISE
caUtIon
.
Preventive maintenance is the best way to avoid
unnecessary expense and inconvenience. Have this
system inspected at regular intervals by qualified service
personnel, at least twice a year. Routine maintenance
should cover the following items:
1. Tighten all set screws, and wire connections.
2. Clean evaporator and condenser coils mechanically
or with cold water, if necessary. Usually any fouling
is only matted on the entering air face of the coil and
can be removed by brushing.
3.
Replace filters as needed (see below).
4. Check for blockage of condensate drain.
5. Check power and control voltages.
6. Check running amperage.
7. Check operating temperatures and pressures.
8. Check and adjust temperature and pressure controls.
9. Check and adjust damper linkages.
10. Check operation of all safety controls.
11. Examine gas furnaces (see below and the User’s
Information Manual).
12. Check condenser fans and tighten set screws.
f
IltERS
CAUTION
t
o
PREvEnt
PRoPERty
daMaGE
dUE
to
fIRE
and
loSS
of
EqUIPMEnt
EffIcIEncy
oR
EqUIPMEnt
daMaGE
dUE
to
dUSt
and
lInt
bUIld
UP
on
IntERnal
PaRtS
,
nEvER
oPERatE
UnIt
WItHoUt
an
aIR
fIltER
InStallEd
In
tHE
REtURn
aIR
SyStEM
.
Every application may require a different frequency of
replacement of dirty filters. Filters must be replaced at least
every three (3) months during operating seasons.
Dirty filters are the most common cause of inadequate
heating or cooling performance. Filter inspection should be
made at least every two months; more often if necessary
because of local conditions and usage.
Dirty throwaway filters should be discarded and replaced
with a new, clean filter.
Disposable return air filters are supplied with this unit. See
the unit Specification Sheet or Technical Manual for the
correct size and part number. To remove the filters, remove
the filter access panel on return side of the unit.
c
abInEt
f
InISH
M
aIntEnancE
Use a fine grade automotive wax on the cabinet finish to
maintain the finish’s original high luster. This is especially
important in installations with extended periods of direct
sunlight.
c
lEan
o
UtSIdE
c
oIl
(q
UalIfIEd
S
ERvIcER
o
nly
)
The coil with the outside air flowing over it should be
inspected annually and cleaned as frequently as necessary
to keep the finned areas free of lint, hair and debris.
c
ondEnSER
a
nd
I
ndUcEd
d
Raft
M
otoRS
Bearings on the condenser fan motors and the combustion
fan motor are permanently lubricated. No additional oiling
is required.
f
laME
S
EnSoR
(q
UalIfIEd
S
ERvIcER
o
nly
)
A drop in the flame current can be caused by a nearly
invisible coating on the flame sensor. This coating, created
by the fuel or combustion air supply, can be removed by
carefully cleaning the flame sensor with steel wool.
notE: a
ftER
clEanInG
,
tHE
MIcRoaMP
SIGnal
SHoUld
bE
StablE
and
In
tHE
RanGE
of
4 - 6
MIcRoaMPS
dc.
f
lUE
P
aSSaGES
(q
UalIfIEd
S
ERvIcER
o
nly
)
At the start of each heating season, inspect and, if
necessary, clean the unit flue passage.
l
UbRIcatIon
The fan shaft bearings, the supply fan motors, the
condenser fan motors and compressors are permanently
lubricated.
I
nSPEctIon
& c
lEanInG
All flue product carrying areas of the furnace, its vent
system, and main burners should be examined by a
qualified service agency, and cleaned if necessary, before
the start of each heating season. This examination is
necessary for continued safe operation. Particular attention
should be given to deterioration from corrosion or other
sources. This examination is accomplished in the following
manner.
1. Disconnect power to the unit and remove furnace
section access panel.
2. Remove burner assembly:
a. Disconnect the wires from the gas valve after
noting which wires are connected to each
terminal.
b.
Disconnect wires from the flame rod and ignition
electrode.
c. Disconnect the gas piping at the union.
d. The entire burner assembly can now be
removed from the unit.
notE: U
SE
all
ScREWS
tHat
WERE
REMovEd
;
tHEy
aRE
nEcESSaRy
foR
SafE
and
PRoPER
oPERatIon
of
tHE
UnIt
.
