Carrier 50MQ - Manual (Page 9)

FAN MOTOR BEARINGS are prelubricated for 3
years heavy duty or 5 years normal duty. When
lubrication is necessary, send motor to authorized
motor repair shop.
Evaporator (Indoor Coil)
CAUTION: Before performing recommended ;
maintenance, be sure main power switch to unit
is turned off.
COIL ” Lift or remove unit top cover for access to
indoor coil. See Fig. 10. Inspect coil periodically.
Clean as described under Condenser (Outdoor Coil)
below.
Condensate Drain Clean condensate drain trap
then flush condensate pan with bottle brush,
beneath evaporator coil with clean water. Ensure
water flows freely thru condensate drain.
INDOOR FAN WHEEL should be centered in fan
housing. To adjust fan, remove fan motor orifice
assembly as described below. Loosen setscrew
holding fan to motor shaft. Adjust fan and
retighten setscrew.
Indoor Fan Removal — See Fig. 10. Disconnect fan
motor wiring. Remove sheet metal screws (6)
holding fan orifice in place. Remove fan motor
bracket mounting screws (3). Slide out complete
fan, motor and orifice assembly.
Cleaning Indoor Fan Wheel — Remove caked-on
dirt from fan wheel and housing with brush;
remove grease with mild solvent. When replacing
blower assembly, ensure fan wheel is centered in
housing.
Condenser (Outdoor Coil)
COIL “ Lift or remove top cover for access to
outdoor coil. See Fig. 10. Inspect coil periodically.
Clean coil with water at the beginning of every
cooling season or more often if required. Use
ordinary garden hose at a pressure high enough to
clean efficiently. For best results, spray coil fins
from inside-to-outside the unit or top to bottom
between rows of tubing. Flush dirt from base pan
by spraying water thru top of unit. Avoid splashing
mud on coil or water on the fan motor.
OUTDOOR FAN POSITION - Required fan posi­
tion is shown in Fig. 11. Adjust fan by loosening
setscrews and moving blades up or'down.
OUTDOOR FAN AND MOTOR REMOVAL -
Remove screws holding outdoor coil fan grille in
place. Disconnect fan motor leads from controllers
and capacitor. Lift complete fan, motor and orifice
assembly (Fig. 10) out of unit. After replacing fan
motor assembly, reconnect fan motor leads.
UNIT TOP CCVER
OUTDOOR FAN-ORIFICE
FAN MOTOR ASSEMBLY
NDOOR COIL
OUTDOOR COIL
4-WAY VALVE
CONTROL BOX
ACCUMULATOR
AIR FLOW INDOOR FAN-
ORIFICE MOTOR
LINE WIRING
SPLICE BOX
Fig. 10 — Component Location
FANBLAOe
/
TOP OF
SLADE
L
------ '------'------------ • -JiVMXl '
SETscf?ew
2,00 iri \
№
MOTOR
Fig. 11 — Outdoor Fan Position
Return Air Filter (Field Supplied) — Replace
throwaway filter twice a year. Clean permanent-
type filter a minimum of twice yearly. Flush
permanent filter with hot water, steam or soak in
mild solution of soap or detergent and water.
Allow filters to dry and replace. Refer to filter
manufacturer’s instructions, as required, for other
types of filters.