# 48306B006 Page 17
MAINTENANCE
Before performing maintenance operations on
system, turn the electric power to unit OFF at
disconnect switch(es). Unit may have multiple
power supplies. Electrical shock could cause
personal injury or death.
WARNING
Before the start of each heating and cooling season, the
following service checks should be performed by a
qualified service technician.
• Inspect and clean outdoor and indoor coils. The
outdoor coil may be flushed with a water hose.
NOTE: It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which
are corrosive or which block airflow across the coil
(such as pet urine, cottonwood seeds, etc...).
• Visually inspect the refrigerant lines and coils for leaks.
• Check wiring for loose connections.
• Check voltage at the indoor and outdoor units (with
units operating).
• Check amperage draw at the outdoor fan motor,
compressor, and indoor blower motor. Values should
be compared with those given on unit nameplate.
• Check, clean (or replace) indoor unit filters.
• Check the refrigerant charge and gauge the system
pressures.
• Check the condensate drain line for free and unob-
structed flow. Clean drain line, if necessary.
• Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
• Belt drive blowers: Check drive belt for wear and
proper tensions.
If insufficient cooling is reported, the unit should be
gauged and refrigerant charge checked (see Refrigerant
Charging on page 11).
Defrost Control Board
Diagnostic LEDs
edoM
DELneerG
)2SD(
DELdeR
)1SD(
rewoPoN
draoBot
ffOffO
/noitarepOlamroN
draoBotrewoP
hsalFwolSsuoenatlumiS
elcyCtrohS-itnA
tuokcoL
hsalFwolSgnitanretlA
erusserPwoL
tluaFhctiwS
ffO hsalFwolS
erusserPwoL
tuokcoLhctiwS
ffOnO
erusserPhgiH
tluaFhctiwS
hsalFwolS ffO
erusserPhgiH
tuokcoLhctiwS
nOffO
Table 10
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