Onlyqualifiedservicepersonnelshouldperformmaintenanceand
serviceproceduresthatrequireunittopremoval.
Refertothefollowingtopremovalprocedures:
1.Removescrewsonunittopcoversurface.(Saveallscrews.)
2.Removescrewsonunittopcoverflange.(Saveallscrews.)
3.Lifttopfromunitcarefully.Settoponedgeandmakesure
thattopissupportedbyunitsidethatisoppositeduct(or
plenum)side.
4.Carefullyreplaceandsecureunittoptounit,usingscrews
removedinSteps1and2,whenmaintenanceand/orservice
proceduresarecompleted.
Step 3 -- Indoor Blower and Motor
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
I
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect and tag electrical power to the unit before
cleaning and lubricating the blower motor and wheel.
To clean the blower wheel:
1. Remove the blower housing:
a. Remove the screws on the external side of the duct
panel that fasten the housing to the duct panel assembly.
b. Remove the side access panel and unscrew the
mounting bracket that fastens the blower housing to the
internal partition panel fo the control box assembly.
c. Make sure that the blower housing is supported by hand
before completely removing the mounting bracket.
d. Slide the blower housing from the rails of the duct panel
and place it outside the unit.
2. Remove the blower wheel from the housing:
a. Loosen the set screw which secures the wheel to the
motor shaft.
b. Loosen the three mounting legs of the motor by
removing the bolts that fasten themounting legs to the
housing.
c. Slide out the motor assembly (motor, belly band and the
3 mounting legs) from the hub of the wheel.
d. Remove the filler panel at the discharge end of the
blower housing by removing the two screws that fasten
it to the housing.
e. Remove the wheel form the housing.
3. Remove the caked on dirt from the wheel and the motor
using a brush.
4. Remove lint and dirt accumulations from the wheel and
housing with a vacuum cleaner, using a soft brush
attachment.
5. Remove grease and oil with a mild solvent.
6. Reassemble
a. Slip the wheel back in the housing with the hub set
screw parented in the correct direction.
b. Install the filler panel.
c. Reinsert the motor assembly in the wheel hub and align
the mounting legs with the housing mounting hold
locations.
d. Tighten the mounting bolts to fasten the motor assembly
with the housing.
e. Center the wheel in the housing by sliding it, align the
flat end of the shaft with the set screw and tighten the
set screw.
f. Slide back the blower housing into the mounting rails in
the duct panel and install the mounting bracket back in
its position.
g. Install the screws on the external side of the duct panel
to fasten duct panel with the housing.
h. Replace the side access panel.
Table 6 -Wet Coil Pressure Drop
UNIT STANDARD CFM (S.C.EM.)
SIZE 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
024 .027 .034 040 .047 .053 - - -
030 .036 .042 .050 .055 .063 .072 .081 - -
036 - - .050 .055 .063 .072 .081 .090 .097 - -
042 - - .042 .049 .052 .059 .065 .071 .078 .085 .091
048 .... .072 .081 .090 .097 .108 .120 .129 .139
060 .... .071 .078 .085 .091 .098 .114
UNIT SIZE
024-036
042-060
FILTER
SiZE in.
(mm)
24 x 24
610 x 610
30 x 30
762 x 762
500 600
0.06 0.07
Table 7 - Filter Pressure Drop (in. wc)
CFM
700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.08 0.08 0.09 0.09 0.09 0.10 0.11 0.12 0.14 0.15
0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18
Table 8 - Accessory Electric Heat Pressure Drop (in. wc)
HEATER CFM
kW 600 800 1000 1200 1400 1600 1800 2000 2200
5-20 0.06 0.08 0.10 0.13 0.15 0.18 0.20 0.23 0.25
18
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