Lennox XPG20 User Manual

Page 1

© 2009 Lennox Industries Inc.

Corp. 0907−L3

XPG20

Service Literature

XPG20 SERIES UNITS

The XPG20−036 is a high efficiency residential split−system
heat pump unit, which features a solar assisted DC motor,
two−step scroll compressor and HFC−410A refrigerant. The
XPG20 is designed for use with an expansion valve only
(approved for use with HFC−410A) in the indoor unit. This
manual is divided into sections which discuss the major
components, refrigerant system, charging procedure,
maintenance and operation sequence.

CAUTION

Physical contact with metal edges and corners while
applying excessive force or rapid motion can result
in personal injury. Be aware of, and use caution when
working nearby these areas during installation or
while servicing this equipment.

CAUTION

To prevent personal injury, or damage to panels, unit
or structure, be sure to observe the following:

While installing or servicing this unit, carefully stow
all removed panels out of the way, so that the panels
will not cause injury to personnel, nor cause damage
to objects or structures nearby, nor will the panels be
subjected to damage (e.g., being bent or scratched).

While handling or stowing the panels, consider any
weather conditions, especially windy conditions,
that may cause panels to be blown around and bat­tered.

WARNING

Improper installation, adjustment, alteration, service
or maintenance can cause personal injury, loss of
life, or damage to property.

Installation and service must be performed by a
licensed professional installer (or equivalent) or a
service agency.

DANGER

Shock Hazard
Remove all power at disconnect before

removing access panel.
XPG20 units use single-pole contac­tors. Potential exists for electrical
shock resulting in injury or death.
Line voltage exists at all components
(even when unit is not in operation).

Table of Contents

General 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications / Electrical Data 2. . . . . . . . . . . . . . . . . .

I Application 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

II Unit Components 3. . . . . . . . . . . . . . . . . . . . . . . . . . . .

III Refrigerant System 18. . . . . . . . . . . . . . . . . . . . . . . . . .

IV Charging 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

V Service and Recovery 34. . . . . . . . . . . . . . . . . . . . . . . .

VI Maintenance 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VII Brazing Procedure 34. . . . . . . . . . . . . . . . . . . . . . . . .

VIII Diagrams and Operating Sequence 35. . . . . . . . . .

Page 2

SPECIFICATIONS

General
Data

Model No. XPG20−036

Nominal Tonnage (kW) 3 (10.6)

Connections
(sweat)

Liquid line (o.d.) − in. (mm) 3/8 (9.5)

Vapor line (o.d.) − in. (mm) 7/8 (22.2)

Refrigerant

1

R−410A charge furnished 12 lbs. 5 oz. (5.6 kg)

Outdoor
Coil

Net face area − sq. ft. (m2) Outer coil 20.50 (1.90)

Inner coil 19.86 (1.85)

Tube diameter − in. (mm) 5/16 (0.52)

No. of rows 2

Fins per inch (m) 22 (866)

Outdoor
Fan

Diameter − in. (mm) 26 (660)

No. of blades 3

Motor hp (W) 1/3 (249)

Cfm (L/s) 1st stage 2500 (1180)

2nd stage 2800 (1320)

Rpm − 1st stage 700

2nd stage 820

Watts − 1st stage 70

2nd stage 105

Shipping Data − lbs. (kg) 1 pkg. 315 (143)

ELECTRICAL DATA

Line voltage data − 60hz 208/230V−1ph

3

Maximum overcurrent protection (amps) 40

2

Minimum circuit ampacity 23.7

Compressor

Rated load amps 16.7

Locked rotor amps 82

Power factor 0.98

Outdoor Coil
Fan Motor

Full load amps 2.8

OPTIONAL ACCESSORIES − must be ordered extra

Compressor Hard Start Kit

10J42 S

81J69

Compressor Low Ambient Cut−Off 45F08 S

Freezestat

3/8 in. tubing 93G35 S

1/2 in. tubing 39H29 S

5/8 in. tubing 50A93 S

Indoor Blower Relay 40K58 S

Low Ambient Kit 68M04 S

Monitor Kit − Service Light 76F53 S

Mounting Base 69J07 S

Outdoor
Thermostat
Kit

Thermostat 56A87 S

Mounting Box − US 31461 S

Canada 33A09 S

SignatureStatt Home Comfort Control 81M28 S

Refrigerant
Line Sets

L15−65−15
L15−65−30

L15−65−40
L15−65−50

S

Field Fabricate

Time Delay Relay 58M81 S

NOTE − Extremes of operating range are plus 10% and minus 5% of line voltage.

1

Refrigerant charge sufficient for 15 ft. (4.6 m) length of refrigerant lines.

2

Refer to National or Canadian Electrical Code manual to determine wire, fuse and disconnect size requirements.

3

HACR type breaker or fuse.

Page 3

I−APPLICATION

All major components (indoor blower and coil) must be
matched according to Lennox recommendations for the
compressor to be covered under warranty. Refer to the En­gineering Handbook for approved system matchups. A
misapplied system will cause erratic operation and can re­sult in early compressor failure.

II−Unit Components

Remove 4 screws to
remove panel for
accessing compressor
and controls.

Install by positioning
panel with holes
aligned; install screws
and tighten.

FIGURE 1

Access Panel

Removing Access Panels

Remove and reinstall the access panel as described in fig­ure 1.

Remove the louvered panels as follows:

1−. Remove 2 screws, allowing the panel to swing open

slightly.

2−. Hold the panel firmly throughout this procedure.

Rotate bottom corner of panel away from hinge corner
post until lower 3 tabs clear the slots (see figure 2, De­tail B).

3−. Move panel down until lip of upper tab clears the top

slot in corner post (see figure 2, Detail A).

Position and Install PanelPosition the panel almost
parallel with the unit (figure 2, Detail D) with the screw
side" as close to the unit as possible. Then, in a continuous
motion:

Slightly rotate and guide the LIP of top tab inward (figure 2,

Details A and C); then upward into the top slot of the
hinge corner post.

Rotate panel to vertical to fully engage all tabs.

Holding the panel’s hinged side firmly in place, close the

right−hand side of the panel, aligning the screw holes.

When panel is correctly positioned and aligned, insert the
screws and tighten.

Detail A

Detail C

Detail B

FIGURE 2

Removing/Installing Louvered Panels

MAINTAIN MINIMUM PANEL ANGLE (AS CLOSE TO PARALLEL WITH THE UNIT
AS POSSIBLE) WHILE INSTALLING PANEL.

PREFERRED ANGLE
FOR INSTALLATION

Detail D

ROTATE IN THIS DIRECTION;
THEN DOWN TO REMOVE PANEL

SCREW
HOLES

ANGLE MAY BE TOO
EXTREME

HOLD DOOR FIRMLY TO THE HINGED

SIDE TO MAINTAIN

FULLY−ENGAGED TABS

LIP

IMPORTANT! Do not allow panels to hang on unit by top tab. Tab
is for alignment and not designed to support weight of panel.

Panel shown slightly ro­tated to allow top tab to
exit (or enter) top slot
for removing (or instal­ling) panel.

Page 4

CONTACTOR

DEFROST CONTROL

VAPOR VALVE AND GAUGE PORT

TWO−STAGE COMPRESSOR

OUTDOOR FAN

SOLAR ASSIST DC MOTOR

LENNOX SYSTEM OPERATION

MONITOR (LSOM)

RUN CAPACITOR

DISCHARGE LINE

REVERSING VALVE

SOLAR PANEL TERMINAL

BLOCK

BI−FLOW FILTER DRIER

AC FAN MOTOR

SOLAR ASSIST DC MOTOR
COUPLER

HIGH PRESSURE SWITCH

LOW PRESSURE SWITCH

COMPRESSOR TERMINAL PLUG

AC FAN MOTOR MOUNT

FIGURE 3

GROUND LUG

HIGH VOLTAGE FIELD CONNECTIONS

CONTACTOR−1POLE,25A (K1−1)

DEFROST CONTROL BOARD (A108)

LOW VOLTAGE − CONTROL WIRE TIE

LSOM MODULE (A132)

TERMINAL BLOCK − TWO POSITION (SOLAR)

CAPACITOR (C12)

DEFROST RELAY SOLAR FAN (K227)

SOLAR FAN RELAY (24VAC) (K228)

FIGURE 4

Page 5

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

Electrostatic discharge can affect electronic
components. Take precautions during unit instal­lation and service to protect the unit’s electronic
controls. Precautions will help to avoid control
exposure to electrostatic discharge by putting
the unit, the control and the technician at the
same electrostatic potential. Neutralize electro­static charge by touching hand and all tools on an
unpainted unit surface before performing any
service procedure.

A−Two−Stage Scroll Compressor (B1)

The scroll compressor design is simple, efficient and re­quires few moving parts. A cutaway diagram of the scroll
compressor is shown in figure 1.The scrolls are located in
the top of the compressor can and the motor is located just
below. The oil level is immediately below the motor.

The scroll is a simple compression concept centered
around the unique spiral shape of the scroll and its inherent
properties. Figure 6 shows the basic scroll form. Two iden­tical scrolls are mated together forming concentric spiral
shapes (figure 7). One scroll remains stationary, while the
other is allowed to orbit" (figure 8). Note that the orbiting
scroll does not rotate or turn but merely orbits" the station­ary scroll.

FIGURE 5

TWO−STAGE MODULATED SCROLL

slider ring

solenoid actuator coil

FIGURE 6

SCROLL FORM

FIGURE 7

STATIONARY

SCROLL

ORBITING SCROLL

DISCHARGE

SUCTION

CROSS−SECTION OF SCROLLS

TIPS SEALED BY

DISCHARGE PRESSURE

DISCHARGE
PRESSURE

The counterclockwise orbiting scroll draws gas into the out-

er crescent shaped gas pocket created by the two scrolls

(figure 8 − 1). The centrifugal action of the orbiting scroll

seals off the flanks of the scrolls (figure 8 − 2). As the orbiting

motion continues, the gas is forced toward the center of the

scroll and the gas pocket becomes compressed (figure 8

−3). When the compressed gas reaches the center, it is dis-

charged vertically into a chamber and discharge port in the

top of the compressor (figure 8 − 4). The discharge pressure

forcing down on the top scroll helps seal off the upper and

lower edges (tips) of the scrolls (figure 7). During a single or-

bit, several pockets of gas are compressed simultaneously

providing smooth continuous compression.

The scroll compressor is tolerant to the effects of liquid re-

turn. If liquid enters the scrolls, the orbiting scroll is allowed

to separate from the stationary scroll. The liquid is worked

toward the center of the scroll and is discharged.

Due to its efficiency, the scroll compressor is capable of

drawing a much deeper vacuum than reciprocating com-

pressors. Deep vacuum operation can cause internal fusite

arcing resulting in damaged internal parts and will result in

compressor failure. This type of damage can be detected

and will result in denial of warranty claims. The scroll com-

pressor can be used to pump down refrigerant as long as

the pressure is not reduced below 7 psig.

NOTE − During operation, the head of a scroll compressor

may be hot since it is in constant contact with discharge

gas.

The scroll compressors in all XPG20 model units are de-

signed for use with R410A refrigerant and operation at high

pressures. Compressors are shipped from the factory with

3MA (32MMMA) P.O.E. oil. See electrical section in this

manual for compressor specifications.

Page 6

TWO−STAGE OPERATION

The two−stage scroll compressor operates like any stan-

dard scroll compressor with the exception the two−stage

compressor modulates between first stage (low capacity

approximately 67%) and second stage (high capacity).

Modulation occurs when gas is bypassed through bypass

ports (figure 9 bypass ports open) in the first suction pock-

et. This bypassing of gas allows the compressor to operate

on first stage (low capacity) if thermostat demand allows.

Indoor thermostat setting will determine first or second

stage operation. The compressor will operate on first−stage
until demand is satisfied or the indoor temperature reaches
the thermostat set point calling for second−stage.

Second−stage (high capacity) is achieved by blocking the
bypass ports (figure 9 bypass ports closed) with a slider
ring. The slider ring begins in the open position and is con­trolled by a 24VDC internal solenoid. On a Y2 call the inter-
nal solenoid closes the slider ring, blocking the bypass
ports and bringing the compressor to high capacity. Two−
stage modulation can occur during a single thermostat de­mand as the motor runs continuously while the compressor
modulates from first−stage to second− stage.

FIGURE 8

SCROLL

HOW A SCROLL WORKS

SUCTION

SUCTION

SUCTION

MOVEMENT OF ORBIT

STATIONARY SCROLL

ORBITING

CRESCENT

SHAPED GAS

POCKET

HIGH

PRESSURE

GAS

DISCHARGE

POCKET

FLANKS

SEALED BY

CENTRIFUGAL

FORCE

12

3

4

SUCTION

INTERMEDIATE

PRESSURE

GAS

SUCTION

POCKET

FIGURE 9

Bypass Ports

Closed

High Capacity

Bypass Ports

Open

Low Capacity

TWO−STAGE MODULATION

Page 7

INTERNAL SOLENOID (L34)

The internal unloader solenoid controls the two−stage op-

eration of the compressor by shifting a slide ring mecha-

nism to open (low capacity) or close (high capacity), two

by−pass ports in the first compression pocket of the scrolls

in the compressor. The internal solenoid is activated by a

24 volt direct current solenoid coil. The internal wires

from the solenoid in the compressor are routed to a 2 pin

fusite connection on the side of the compressor shell. The

external electrical connection is made to the compressor

with a molded plug assembly. The molded plug receives 24

volt DC power from the LSOM II.

If it is suspected the unloader is not operating properly,

check the following

IMPORTANT

This performance check is ONLY valid on systems
that have clean indoor and outdoor coils, proper air­flow over coils, and correct system refrigerant
charge. All components in the system must be func­tioning proper to correctly perform compressor
modulation operational check. (Accurate measure­ments are critical to this test as indoor system load­ing and outdoor ambient can affect variations be­tween low and high capacity readings).

STEP 1 Confirm low to high capacity compressor

operation

Tools required

Refrigeration gauge set

Digital volt/amp meter

Electronic temperature thermometer

On-off toggle switch

Procedure

1−. Turn main power "OFF" to outdoor unit.

2−. Adjust room thermostat set point above (heating op-

eration on heat pump) or below (cooling operation) the
room temperature 5ºF.

3−. Remove control access panel. Install refrigeration

gauges on unit. Attach the amp meter to the common
(black wire) wire of the compressor harness. Attach
thermometer to discharge line as close as possible to
the compressor.

4−. Turn toggle switch "OFF" and install switch in series

with Y2 wire from room thermostat.

5−. Cycle main power "ON."

6−. Allow pressures and temperatures to stabilize before

taking any measured reading (may take up to 10 min­utes).

NOTE − Block outdoor coil to maintain a minimum of 375
psig during testing).

7−. Record all of the readings for the Y1 demand on table

1.

8−. Close switch to energize Y2 demand.

9−. Allow pressures and temperatures to stabilize before

taking any measured reading (this may take up to 10
minutes).

10−.Record all of the readings of Y2 demand on table 1.

NOTE − On new installations or installations that have
shut down for an extended period of time, if the com­pressor does not cycle from low stage to high stage on
the first attempt, it may be necessary to recycle the com­pressor back down to low stage and back up to high
stage a few times in order to get the bypass seals to
properly seat

Compare Y1 readings with Y2 readings in table 1. Some
readings should be higher, lower or the same. If the
readings follow what table 1 specifies, the compressor is
operating and shifting to high capacity as designed. If the
readings do not follow what table1 specifies, continue to
step 2 to determine if problem is with external solenoid
plug power.

Page 8

TABLE 1

Unit Readings

Compressor Operation

Y1 −

1st-Stage

Expected Results

Y2 −

2nd-Stage

Compressor

Voltage Same
Amperage Higher

Condenser Fan motor

Amperage Same or Higher

Temperature

Ambient Same
Outdoor Coil Discharge Air Higher in Cooling

Lower in Heating

Compressor Discharge Line Higher
Indoor Return Air Same
Indoor Coil Discharge Air Lower in Cooling

Higher in Heating

Pressures

Suction (Vapor) Lower
Liquid Higher

STEP 2 Confirm DC voltage output on compressor
solenoid plug

1−. Shut power off to the outdoor unit.

2−. Insert lead wires from voltmeter into back of the red

and black wire plug jack that feeds power to compres­sor solenoid coil. Set voltmeter to DC volt scale to read
DC voltage output from LSOM II plug. See figure 10.

FIGURE 10

3−. Apply a Y1 and Y2 demand from the indoor thermostat

to the LSOM II.

4−. Turn power back on to unit.

5−. Compressor should cycle ON" when Y1 is calling.

6−. With Y2 calling, 5 seconds after compressor cycles

ON", LSOM II will output 24 volt DC signal to the com­pressor solenoid plug. Once the solenoid has pulled in,
the LSOM II will reduce the DC voltage to a pulsating
6 to 18 volt DC output to the solenoid to allow the sole­noid to remain energized.

IMPORTANT

When checking compressor for two−stage operation,
always cycle Y1 to Y2 from terminals on the LSOMII
or room thermostat connections. DO NOT cycle sec­ond stage (Y2) of compressor by unplugging the
24VDC solenoid LSOM II end of plug. The LSOM II will
only output a 6 to 18VDC signal which will be insuffi­cient voltage to pull the solenoid coil in for second
stage.

If compressor solenoid is still not shifting to high capac­ity, this check will verify that DC power is being fed from
the LSOM II.

7−. Shut power off to unit (main and low voltage)

8−. Unplug the 2 pin solenoid plug from the fusite connec-

tion on the compressor and the plug end from the
LSOM II.

9−. Using an OHM meter, check for continuity on the plug

harness wire ends (red to red, black to black). Wires
should have continuity between same colors and no
continuity between opposite color wires.

If the above checks verify that the solenoid plug is pro­viding power to cycle into high capacity operation, con­tinue to step 3 to determine if problem is with solenoid
coil in compressor

STEP 3 Confirm internal unloader solenoid has

proper resistance

1−. Shut all power off to unit (main and low voltage)

2−. Unplug the molded plug from the compressor solenoid

2−pin fusite.

3−. Using a volt meter set on the 200 ohm scale

Replace the Compressor under these conditions:

Page 9

Bad Solenoid

a. Measure the resistance at the 2−pin fusite. The resist­ance should be 32 to 60 ohms depending on compressor
temperature. If no resistance replace compressor.

b. Measure the resistance from each fusite pin to
ground. There should not be continuity to ground. If so­lenoid coil is grounded, replace compressor.

Good Solenoid

a. Seals not shifting, replace compressor
b. Slider ring not shifting, replace compressor.

B−Contactor (K1)

The compressor is energized by a contactor located in the
control box. Units are single phase and use single−pole con­tactors.

C−Low Pressure Switch (S87)

The XPG20 is equipped with an auto−reset low pressure
switch which is located on the suction line. The switch shuts
off the compressor when the suction pressure falls below
the factory setting. This switch is ignored during the first 90
seconds of compressor start up, during defrost operation,
90 seconds after defrost operation, during test mode and
when the outdoor temperature drops below 15°F.

The switch closes when it is exposed to 55 psig and opens
at 25 psig. It is not adjustable.

D−High Pressure Switch (S4)

IMPORTANT

Pressure switch settings for R410A refrigerant will
be significantly higher than units with R22.

An auto-reset, single-pole/single-throw high pressure switch
is located in the liquid line. This switch shuts off the compres­sor when liquid line pressure rises above the factory setting.
The switch is normally closed and is permanently adjusted to
trip (open) at 590 +

15 psi and close at 418 + 15 psi. See fig-

ure 3 for switch location.

E−Capacitor (C12)

The compressor uses a permanent split capacitor (see unit
wiring diagram). The capacitor is located inside the unit con­trol box. Ratings are on capacitor side.

F−Condenser Fan with
Variable Speed Motor(B4)

The variable speed condenser fan motor (figure 11) used in all
units is a three-phase, electronically controlled d.c. brushless
motor (controller converts single phase a.c. to three phase
d.c.), with a permanent-magnet-type rotor, manufactured by
GE. Because this motor has a permanent magnet rotor it does
not need brushes like conventional D.C. motors. The motors
consist of a control module and motor . Internal components
are shown in figure 12. The stator windings are split into three
poles which are electrically connected to the controller. This ar­rangement allows motor windings to be turned on and off in
sequence by the controller.

The controller is primarily an a.c. to d.c. converter. Con­verted d.c. power is used to drive the motor. The control­ler contains a microprocessor which monitors varying
conditions inside the motor (such as motor workload).

The controller uses sensing devices to know what position
the rotor is in at any given time. By sensing the position of
the rotor and then switching the motor windings on and off
in sequence, the rotor shaft turns the blower.

VARIABLE SPEED CONDENSER FAN MOTOR

FIGURE 11

RED

YELLOW

BLACK

RED

BLUE

motor

control module

BLOWER MOTOR COMPONENTS

FIGURE 12

STATOR

(WINDINGS)

OUTPUT

SHAFT

BEARING

ROTOR

Internal Operation

The condenser fan motor is a variable speed motor with RPM
settings at 700 (Y1) and 820 (Y2). The variation in speed is
accomplished each time the controller switches a stator wind­ing (figure11) on and off, it is called a pulse." The length of
time each pulse stays on is called the pulse width." By vary­ing the pulse width the controller varies motor speed (called
pulse-width modulation"). This allows for precise control of
motor speed and allows the motor to compensate for varying
load conditions as sensed by the controller. In this case, the
controller monitors the static workload on the motor and var­ies motor rpm in order to maintain constant airflow (cfm).

Motor rpm is continually adjusted internally to maintain
constant static pressure against the fan blade. The control­ler monitors the static work load on the motor and motor
amp-draw to determine the amount of rpm adjustment.
Blower rpm is adjusted internally to maintain a constant
cfm. The amount of adjustment is determined by the incre­mental taps which are used and the amount of motor load­ing sensed internally. The motor constantly adjusts rpm to
maintain a specified cfm.

Page 10

Initial Power Up

When line voltage is applied to the motor, there will be a
large inrush of power lasting less than 1/4 second. This in­rush charges a bank of DC filter capacitors inside the con­troller. If the disconnect switch is bounced when the discon­nect is closed, the disconnect contacts may become
welded. Try not to bounce the disconnect switch when ap­plying power to the unit.

The DC filter capacitors inside the controller are connected
electrically to the speed tap wires. The capacitors take
approximately 5 minutes to discharge when the disconnect
is opened. For this reason it is necessary to wait at least 5
minutes after turning off power to the unit before attempting
to service motor.

DANGER

Disconnect power from unit and wait at
least five minutes to allow capacitors to
discharge before attempting to service
motor. Failure to wait may cause personal
injury or death.

Motor Start-Up

At start-up, the motor may gently rock back and forth for a
moment. This is normal. During this time the electronic
controller is determining the exact position of the rotor.
Once the motor begins turning, the controller slowly
eases the motor up to speed (this is called soft-start").
The motor may take as long as 10-15 seconds to reach
full speed. If the motor does not reach 200rpm within 13
seconds, the motor shuts down. Then the motor will im­mediately attempt a restart. The shutdown feature pro­vides protection in case of a frozen bearing or blocked
fan blade. The motor may attempt to start eight times. If
the motor does not start after the eighth try, the controller
locks out. Reset controller by momentarily turning off
power to unit.

Troubleshooting

If first or second stage thermostat call for cool is present
and the variable speed condenser fan motor does not ener­gize, check voltage at the breaker box. If voltage is present
do the following and reference figure 13.

1− Check for 240 volts between the compressor RED wi-

res.

2− Initiate a first stage call for cool. Check for 24 volts be-

tween the fan motor YELLOW wire and fan motor
BLACK wire.

3− Initiate a second stage call for cool. Check for 24 volts

between the fan motor YELLOW wire and fan motor
BLACK wire, then check for 24 volts between the fan
motor BLUE wire and fan motor BLACK.

4− Repeat steps 1 and 2 with a HEAT call.

FIGURE 13

RED

RED

240V

YELLOW

BLUE

BLACK

common

1st Stage (low capacity − 700 rpm)

2nd Stage (High capacity − 820 rpm)

B4

24V

Y1

Y2

RED

RED

YELLOW

BLUE

BLACK

B4

240V

24V

common

Y2

Y1

24V

0V

24V

24V

240V

240V

Page 11

Replacement

Follow the steps below if condenser fan motor replacement
is necessary.
1 Disconnect power at the main disconnect switch or

main fuse box/breaker panel.

2 Disconnect DC solar motor wires and AC outdoor fan

motor wires (highlted in figure 14).

FIGURE 14

3 Remove 4 screws on top of grille. Remove alignment nut. Lift assembly up and out.

FIGURE 15

screw location

ac motor

dc motor

coupler

alignment nut

CAUTION

Outdoor fan assembly is
heavy and awkward to handle