Lennox CHA16, Руководство по обслуживанию

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Page 29
3- Remove filter access panel and insert other hose through
hole provided on the panel above filter and connect to
negative (low) pressure side of gauge.
4- Turn on blower and determine draft gauge reading.
5- Adjust blower speed as required (see section C-Blow
er Belt Adjustment).
C-Blower Belt Adjustment
Proper pulley alignment and belt tension must be main
tained for maximum belt life.
NOTE-Tension new belt after 24-48 hours of operation.
This will allow belts to stretch and seat in grooves. To
increase belt tension, loosen two locking bolts and pull
mounting plate. Tighten motor mounting plate in verti
cal position.
Adjusting Unit CFM:
The CFM can be changed by using the following procedure:
1- Remove the blower belt.
2- Loosen the set screws on motor pulley and remove
key as shown in figure 28.
3- Turn pulley clockwise to increase CFM and counter
clockwise to decrease CFM. One half turn changes
blower speed approximately 20 RPM.
NOTE-The pulley is factory set at three turns open.
4- Replace the key and tighten the set screw. Replace
and tighten the blower belt.
FIGURE 28
BLOWER SPEED ADJUSTMENT
BLOWER PULLEY
MOTOR PULLEY
SET SCREW
KEY
BLOWER
TO INCREASE CFM
TURN PULLEY CLOCKWISE
TO DECREASE CFM
TURN PULLEY
COUNTERCLOCKWISE
TO INCREASE BELT TENSION
1 - Loosen 2 locking bolts.
2 - Pull motor mounting plate.
3 - Tighten motor mounting
plate so plate is vertical.
MOTOR
MOUNTING PLATE
MEASURE
RPM
HERE
VIII-MAINTENANCE
CAUTION
Electrical shock hazard. Turn off power to unit be
fore performing any maintenance, cleaning or
service operation on the unit.
A-Filters (Figure 29)
CHA16 unit is equipped with four
pleated 2" throw-away type filters.
Permanent 1" foam filters are ac
ceptable replacements. Filters
should be checked monthly (or
more frequently in severe use) and
cleaned or replaced regularly. If per
manent foam filters are used as a
replacement, they should be
checked and cleaned periodically
with warm water and a mild deter
gent. Take note of the AIR FLOW DIRECTION" marking on
the filter frame when re-installing.
NOTE-Filters must be U.L.C. certified or equivalent for
use in Canada.
B-Lubrication
All motors used in CHA16 units are prelubricated; no fur
ther lubrication is required.
C-Supply Air Blower Wheel
Annually inspect supply air blower wheel for accumulated
dirt or dust. Turn off power before attempting to remove ac
cess panel or to clean blower wheel.
D-Evaporator Indoor Coil
Inspect and clean coil at beginning of each season. Clean
using mild detergent or commercial coil cleanser. Check
condensate drain pan and line, if necessary. Flush coil and
condensate drain with water taking care not to get insula
tion, filters, return air ducts wet. Check connecting lines and
coil for evidence of oil leaks.
E-Condenser Coil
Clean condenser coil annually with detergent or com
mercial coil cleaner and inspect monthly during the
cooling season. Check connecting lines and coil for evi
dence of oil leaks.
Condenser coils are made of individual coil slabs. Dirt and de
bris may become trapped between the slabs. To clean be
tween slabs, carefully separate slabs and wash thoroughly.
See figure 30.
F-Electrical
1- Check all wiring for loose connections.
2- Check for correct voltage at unit (unit operating).
3- Check amp-draw on both condenser fan motor and blow
er motor.
Fan Motor Rating Plate ____ Actual ________
Indoor Blower Motor Rating Plate____ Actual____
CHA16
AIR FILTERS
FIGURE 29