FAN SECTION SERVICE
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Remove unit front access panels for cleaning,
lubrication or parts replacement (Fig. 15).
LOW-VOLTAGE
TERMINAL
STRIP
ELECTRIC
HEATER
FILTER
SECTION
USIBLE LINK
LIMIT SWITCH
SEQUENCERS
-TRANSFORMER
■ POWER LEAD ROUTE TO
FAN SPEED SELECTOR
BLOCK
COOLING CONTROL KIT
(NOT REQ'D WHEN ELEC
■ HEATER IS USED; HUMIDITY
CONTROL KIT REQ'D ON
28TQ INSTALLATIONS)
FAN SPEED SELECTOR
BLOCK
FAN WHEEL (BLOWER
ASSEMBLY)
■ CONDENSATE DRAINS-
HORIZONTAL
INSTALLATIONS
CONDENSATE DRAINS-
UPFLOW OR DOWNFLOW
INSTALLATIONS
REMOVAL
RINGS FOR FILTER
C|>AIRFLJDW T-J
Fig. 15 — Upflow Heating and Cooling Unit
Interior Details (Typical)
1. Shut off unit power.
2. Remove fan section access panel.
3. Disconnect motor wires at fan speed selector
block.
4. Where applicable, disconnect wires from cool
ing control box and remove control box.
5. Remove tie angle screws and tie angle (these
screws secure front corners of filler panels to
fan section side panels as shown in Fig. 11).
Remove screws to allow filler panels to be
raised slightly.
6. Grasp blower assembly firmly — left hand on
motor, right'hand on scroll right side inlet.
7. Pull blower assembly forward. Rotate assembly
so that rear drops slightly, allowing assembly to
pass thru front of unit.
8. Reassembly is the reverse of the above pro
cedure. Note that when reassembling, rear
flange of blower outlet sits on top of fan deck,
tab on forward edge of outlet erigages slot in
front of fan deck.
Cleaning — 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.
Return Air Filter — Pull rings (Fig. 1) are provided
for removing 1-in. permanent filters. Inspect filter
frequently. Clean filter with a vacuum cleaner or
wash with mild soap and water solution.
A steel rod acting as a media support is
imbedded in the filter. Replace filter so that
support prevents media from being drawn into fan
during operation.
Fan Motors
LUBRICATION — Where oil holes are provided,
remove oil plugs and add 8 drops of SAE 20
nondetergent oil at start of every cooling season.
Replace oil plugs. When motor is removed, reinstall
so that oil holes are at least 45 degrees above
horizontal. Motors without oil holes are factory
lubricated for life of motor.
BLOWER ASSEMBLY REMOVAL (Fig. 11)
( \l I l()\ Blow«.I .i"cmbl\ IS hc.iw aiul ma>
hill Iilv wIkii discim:ia;.d lioin ils inouiiiiMg
Support the asscmbl\ to a\oid injur\ or
ELECTRIC HEATER SERVICE
See Fig. 15 for component location. All service
can be completed with heater in place. Ensure all
power is shut off before servicing.
Limit Switch malfunction prevents heating
element from coming on or causes fusible link to
blow. Replace switch if malfunction occurs.
Sequencer malfunction will cause heater not to
come on or never to shut off — replace sequencer.
Transformer — (40- or 60-va) supplies 24-volt
power for control circuit. Replace transformer if
faulty.
Fan Relay malfunction will cause unit fan not to
run or run continuously — replace relay.
17
(2 Seiten)
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