Carrier 48XP024040300 User Manual CENTRAL PACKAGE Manuals And Guides L0907192

CARRIER Package Units(both units combined) Manual L0907192 CARRIER Package Units(both units combined) Owner's Manual, CARRIER Package Units(both units combined) installation guides

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Turn to the Expertg

Installation

Instructions

NOTE:
Read the entire instruction manual before starting the
installation.
NOTE:
Installer: Make sure the Owner's Manual and Service
Instructions are left with the unit after installation,

TABLE

OF CONTENTS

SAFETY CONSIDERATIONS
.........................
INTRODUCTION
...................................
RECEIVING AND INSTALLATION .................
Check Equipment ..................................
Identify Unit ....................................
Inspect Shipment .................................
Provide Unit Support ...............................
Roof Curb ......................................
Slab Mount .....................................
Ground Mount ..................................
Field Fabricate Ductwork ............................
Provide Clearances .................................
Rig and Place Unit .................................
Connect Condensate Drain ...........................
Install Flue Hood ...................................
Install Gas Piping ..................................
Install Duct Connections .............................
Configuring Units for Downflow (Vertical)
Discharge ......................................
Install Electrical Connections ........................
High-Voltage Connections ........................
Special Procedures for 208-V Operation ..............
Control Voltage Connections .......................
Easy Select
. ..................................
Transformer Protection ...........................
PRE-START-UP
...................................
START-UP .....................................
Check for Refrigerant Leaks .........................
Unit Sequence of Operation .........................
48XP Sequence of Operation ......................
Start-Up Heating & Make Adjustments ................
Check Heating Control ...........................
Check Gas Input ................................
Adjust Gas Input ................................
Check Burner Flame .............................
Airflow and Temperature Rise ......................
Heating Sequence of Operation .....................
Limit Switches .................................
Rollout Switch .................................
Start-Up Cooling & Make Adjustments ................
Checking Cooling Control Operation ................
Checking & Adjusting Refrigerant Charge ............
Indoor Airflow and Airflow Adjustments .............
MAINTENANCE ................................
Air Filter ........................................
Evaporator Blower and Motor ........................
Flue Gas Passageways ..............................
TM

PAGE
1
2
2-13
2
2
2
2
2
2
2
2
2
4
6
7
7
9
9
10
10
11
11
11
14
14
14-21
14
14
14
15
15
15
15
16
16
16
16
17
17
17
21
21
22-25
22
22
22

C99088

Fig. 1 - Unit 48XP
Combustion Air Blower ............................
Limit Switch .....................................
Burner Ignition ...................................
Main Burners ....................................
Condenser Coil, Evaporator Coil, & Condensate
Drain Pan .......................................
Condenser Fan ...................................
Electrical Controls and Wiring .......................
Refrigerant Circuit .................................
Gas Input ........................................
Evaporator Airflow ................................
Puron® Items ....................................
TROUBLESHOOTING
..............................
START-UP CHECKLIST ............................

SAFETY
Improper

installation,

23
23
23
23
23
24
24
24
24
24
25
26
26

CONSIDERATIONS
adjustment,

alteration,

service

maintenance,

or use can cause explosion,
fire, electrical
shock,
or other
conditions
which may cause death, personal injury, or property
damage.
Consult a qualified
installer,
service agency, or your
distributor
or branch for information
or assistance. The qualified
installer or agency must use factory-authorized
kits or accessories
when modifying
this product. Refer to the individual
packaged with the kits or accessories when installing.

instructions

Follow all safety codes. Wear safety glasses, protective
clothing,
and work gloves. Have a fire extinguisher
available. Read these
instructions
thoroughly
and follow
all warnings
or cautions
included
in literature
and attached
to the unit. consult
local
building

codes,

the current

editions

of the National

Fuel Gas Code

(NFGC)
NFPA
54/ANSI
Z223A,
andthe
(NEC) NFPA 70.
In Canada refer to the current

editions

National

Electrical

of the National

Code

Standards

of

Canada
CAN/CSA-BI49.1
and .2 Natural
Gas and Propane
Installation
codes, and Canadian Electrical Code CSA C22A
Recognize

safety

information.

This is the safety-alert

symbol

Z_

nearest

equipment

distribution

prevent loss
installation.

or damage,

Step 2 --

Provide

For

hurricane

leave

if any item

is missing.
packages

Engineering)

contact

distributor

Certificate

for details

ROOF

CURB

Install

accessory

signal
words

with curb (See Fig. 4). Install insulation,
cant strips,
flashing. Ductwork must be attached to curb.

the most serious hazards which will result in severe personal injury
or death. WARNING
signifies hazards which could result in personal injury or death. CAUTION
is used to identify unsafe practices which may result in minor
erty damage. NOTE is used
result in enhanced

installation,

personal injury or product and propto highlight
suggestions
which will
reliability,

roof curb in accordance

IMPORTANT:
critical

The

for a water

Failure to follow
injury or death.

result

in personal

mm)

warning
damage.

could

SHOCK
HAZARD
result

AND

A
qualified
installer
or
agency
must
use
factory-authorized
kits or accessories
when modifying
product.

slab, or directly

on the ground,

combination
for outdoor

if local codes

Models with an N in the fifth position of the model number are
dedicated
Low NOx units designed
for California
installations.
models

meet

the California

maximum

oxides

of nitrogen

(NOx) emissions
requirements
of 40 nanograms/joule
or less as
shipped from the factory and must be installed in California Air
Quality
Management
Districts
or any other regions
in North
America
where a Low NOx rule exists.

RECEIVING
Step 1 -- Check
IDENTIFY

AND

INSTALLATION

Equipment

UNIT

The unit model number and serial number are stamped on the unit
information
plate. Check this information
against shipping papers.
INSPECT
SHIPMENT
Inspect for shipping damage while unit is still on shipping pallet. If
unit appears to be damaged
or is torn loose from its anchorage,
have it examined
by transportation
inspectors
before
Forward
claim
papers
directly
to transportation
Manufacturer
is not responsible
for any damage incurred
Check

all

items

against

shipping

list.

Immediately

also can result in

information

removal.
company.
in transit.
notify

thick

with

as required.

pad that is a minimum

2 in. (51 mm)

The unit may be installed

above

either

grade.

of 4

The

on a slab or placed directly

if local codes permit. Place the unit
with gravel for condensate
discharge.

Field Fabricate

slab

on

level

on the
ground

Ductwork

flashing

and mastic

in accordance

Ducts passing through an unconditioned
and covered with a vapor barrier.

permit (See Fig. 4 for roof curb dimensions).

These

for additional

by local codes.

with counter
codes.

only
this

installation
(See Fig. 2 and 3 for unit dimensions).
All unit sizes
have return and discharge
openings
for both
horizontal
and
downflow
configurations,
and are factory
shipped
with
all
downflow
duct openings covered. Units may be installed either on
a cement

is

applications,
unit is provided
with flanges
on the horizontal
openings.
All ductwork
should be secured to the flanges. Insulate
and weatherproof
all external ductwork, joints, and roof openings

INTRODUCTION

a rooftop,

supplied

Secure all ducts to roof curb and building
structure
on vertical
discharge units. Do not connect ductwork
to unit. For horizontal

in personal

The 48XP unit (see Fig. 1) is a fully self-contained,
Category I gas heating/electric
cooling unit designed

curb

material

gasketing

slab except when required
GROUND MOUNT

Step 3 --

Failure to follow this
injury, death or property

to the roof

gasketing

applied

and

should be flush on the compressor
end of the unit (to allow
condensate
drain installation)
and should extend 2 in. (51 mm) on
the three remaining
sides of the unit. Do not secure the unit to the

ground,
prepared

ELECTRICAL
POISONING

unit

shipped

roofing,

air leaks and poor unit performance.

in. (102

Before installing or servicing system, always turn off and
tag lockout
main power to system.
There may be more
than one disconnect switch. Turn off accessory heater power
switch if applicable.

FIRE,
EXPLOSION,
CARBON
MONOXIDE

of the
Install

Place the unit on a solid, level concrete

could

with instructions

Curb should be level to within 1/4 in. (6 mm). This is necessary for
unit drain to function
properly.
Refer to accessory
roof curb

or operation.

HAZARD
this warning

seal.

with the roof curb. Improperly

installation
instructions
SLAB MOUNT
ELECTRICALSHOCK

gasketing

tight

and PE

if required.

When you see this symbol on the unit and in instructions
or manuals, be alert to the potential for personal injury. Understand
these
words:
DANGER,
WARNING,
and CAUTION.
These
are used with the safety-alert
symbol. DANGER
identifies

To
until

Unit Support

tie downs,

(Professional

office

all parts in original

the

with

space must

applicable

be insulated

If a plenum return is used on a vertical unit, the return should be
ducted through the roof deck to comply with applicable fire codes.
A minimum
clearance
is not required around ductwork.
Cabinet
return-air
static shall not exceed -.25 IN. W.C..

Step 4 --

Provide

Clearances

The required

minimum

operating

and service

in Fig. 2 and 3. Adequate
combustion,
air must be provided
in accordance
Combustion
and Ventilation,
of the

clearances

NFPA54/ANSI
Z223.1 or applicable provisions
code.
In Canada,
follow
section
8 of
Installation

Codes or applicable

IMPORTANT:

Do

provisions

not restrict outdoor

at either the outdoor-air
detrimental
to compressor

inlet
life.

or

are shown

ventilation
and condenser
with section 9.3, Air for
National
Fuel Gas Code

the

of local building
Can/CSA-BI49.1

of local building
airflow.
fan

code.

An air restriction

discharge

may

be

The condenser
fan pulls air through
the condenser
coil and
discharges
it through the top grille. Be sure that the fan discharge
does not recirculate to the condenser coil. Do not locate the unit in
either a corner or under an overhead
obstruction.
The minimum
clearance
overhang)
horizontal
(1219

under a partial overhang
(such as a normal
house
is 48-in. (1219 mm) above the unit top. The maximum
extension of a partial overhang must not exceed 48-in.

mm)

Do not place the unit where water,

ice, or snow from

an overhang

or roof will damage or flood the unit. Do not install the unit on
carpeting or other combustible
materials. The unit may be installed
on wood flooring or on Class A, B, or C roof covering materials.

106 o
[4 17]

208

_SXPO3OO4O/OGO
_SXP036060/090
CORNER
"1 ....

It
406
[16

UNIT

ELECTRICAL
CHARACTERISTICS

UNIT
_8XPO2_04O/OGO

230

I 60

WT

LBS

KG

340

154

208

230

i

60,

2081230

3 60

344

156

208

230

i

60,

208/230

3 60

368

167

REQ_RED

WEIGHT LBS/KG
2 ....
3....

4"

UNIT

HEIGHT

CENTER OF GRAVITY

"A"
368

40641160]

55881220]

38741i53]

4470[176]

50801200]

55561i4

68131

102146

119/54

030

52123

69/31

103/a7

120155

TO _ OF UNIT ............................
DUCT SIDE OF UNIT .........................................
SIDE OPPOSETE DUCTS.....................................
BOTTOM OF UNIT ..............................
FLUE PANEL ..............................................

036

55124

74133

110150

129158

NEC. REQUIRED CLEARANCES.
MILLIMETERS
[IN]
10668
[4200]
9140
[36 ODE

.......

i0668

@

t

_MINIMUM

DISTANCES:IF

INDOOR COIL

_UTDOOR

12192
[_800]
9140
[3600]
304 8 [1200]*

UNIT IS PLACED LESS THAN 3048
[1200]
FROM WALL
SYSTEM,THEN SYSTEM PERFORMANCE MAYBE COMPROMISED
DIMENSIONS

I

MILLIMETERS
[IN]
91_ O [3600]
91_0
[3600]

EVAP COIL ACCESS SIDE .......................
POWER ENTRY SIDE ........................................
(EXCEPT FOR NEC REQUIREMENTS)
UNIT TOP ...........................................
SIDE OPPOSITE DUCTS.....................................
DUCT PANEL ............................

t

D

[4200]

CLEARANCE FOR OPERATION AND SERVICINO

OUTDOOR

1533
[604]

44701176]

MILLIMETERS
[IN]
3556
[1400]
508
[200]
3556
[1400]
O0 [OOO]
9i44
[3600]

BETWEEN UNITS,
POWER ENTRY SIDE ........................
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIDE
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, DOWER ENTRY SIDE ...................
REQ_RED

O]

CLEARANCES TO COMBUSTIBLE MATL.

51123

805
[317]

Z

B[i_5]

024

5
DOE

MM/IN

Y

940,313702]

IN

[]

ARE IN

INCHES

COIL

TOP VIEW

m_
I

798
[S

5
44]

[4700]

[455]

FIELD ENTRY_
SERVICE

PORTS

i

_I156

FULL

LOUVER
222[088]

DEA

d_
i238
[487]

t
456 R
[1796]

INING

m_:_RN

3130
[1232]

i
[020]
[168]
_3265
[1285]
19

O[O 15] NPT
X 220
DEER

_83
[32

0
72]

LEFT SIDE VIEW

o>
2

COMPRESSOR, 8LOWER, GAS PARTITIO
& ELECTRICAL ACCESS PANEL
12263
[A828]

_724

[463]

a68
[184]
NPT

52 8
[208]
L

FRONT VIEW

898
[353]

[21 67]

GAS ENTRY

1222
[48_]

[285]

L__

L1177

!496
[98B]

[983]

RIGHT SIDE VIEW

REAR VIEW

48XP500006

WT

UNIT

HEIGHT

CENTER OF GRAVITY

"A"

Z

KG

230

1 60,

208/230

3 60

412

181

1091714298:

4953[195]

48XP048090/!15/i30

208

230

1 60,

208/R30

3 60

462

210

I1425[4498:

4953[195]

4476[176]

4572[180]

48XPO6009B/!lS!130

208

230

1 60,

208/230

3 60

507

230

119331469B:

533412/0]

5BBB[ROO]

4420[176]

"i ....

REO_PED

2 ....

3 ....

4"

CLEARANCES TO COMBUSTIBLE MATL.

82/37

124156

144/65

69/31

92/42

139/63

16R/73

TOP OF UNET .............................................
DUCT SEDE OF UNET .........................................
SIDE OPPOSITE DUCTS .....................................
BOTTOM OF UNET............................................
FLUE PANEL ...............................

76135

101146

152/69

178180

NEC. REQUIRED CLEARANCES.

042

62/28

048
060

NB721180]

MILLIMETERS
[IN]
3596
[1400]
508
[200]
3556
[1400]
OO [OOO]
914 4 [36 O0]

MILLIMETERS
[IN]
10668
[a20O]
9140
[3600]

BETWEEN UNITS,
POWER ENTRY SIDE .......................
UNIT AND UNGROUNDED SURFACES, POWER ENTRY SIBE ..........
UNIT AND BLOCK OR CONCRETE WALLS AND OTHER
GROUNDED SURFACES, POWER ENTRY SIDE ....................
REO_RED

t

805
[317]

733
[682]

1[ OUTBOOR

_MINIMUM

[i1

INDOOR
6OIL _.

I

\N

[i1

10668

t

[4200]

CLEARANCE FOR OPERATION AND ,SERVICING
MILLIMETERS
[IN]
9140
[3600]
914 O [3600]

EVAP COIL ACCESS SEDE ..................................
ROWER ENTRY SEDE ............................
(EXCEPT FOR NEC REQUIREMENTS)
oNIT TOP .......................................
SIDE OPPOSITE DUCTS .....................................
DUCT PANEL ..............................................

Y

ml

MM/IN

X

LBS

208

CORNER WEIGHT LBS/KG

4066
[1601]

UNIT

ELECTRICAL
CHARACTERISTICS

UNIT
48XP042060/090

860
[339]

12192
9140
3048

[4800]
[3600]
[1200]_

DESTANCES:ZF UNIT IS PLACED LESS THAN 3048
[1200]
FROM WALL
SYSTEM,THEN SYSTEM PERFORMANCE MAYBE COMPROMISED

DIMENSIONS

[]

IN

ARE IN

INCHES

TOP VIEW

m_

&

10906
[4294]

_1i63
[458]

FIELD ENTRY
SERVECE PORT

.=.

28 61113]

BIA
N 0
POWER ENTRY\

\

t_
• _

_°
FULL

LOUVER

FULL

LOUVER

EL

f
506
[19

_X_
BLOWER,

& ELECTRICAL

11231
[4422]

.

.

.

\
COMPRESSOR,

LEFT SIDE VIEW

SUPPLY
DUCT

93]

GAS SECTION _
ACCESS

[284]

PANEL

466
[i
84]

i422
[SGO]

FRONT VIEW

[016]

526
[R07]

[i3

83]

[1383]

872
[343]

RIGHT SIDE VIEW

REAR VIEW

48XP500009
>

g

J

base\
iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii_i!i!ii!ii!ii!ii!ii!i!!_!!_!!_!!_!i
_i!_iii_ii_ii_ii_ii_ii_ii_ii_ii_i!!!!!_!!_!!i!i!i!ii!ii!iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii!i!i!i!iiiiiiiiiiiiiiiiii_i_l_l
......

J

Screw

/

(NOTE

A)

*Gasketing

/

_
_'_v
.._

Wood \
Flashing.
field

II1_1

tl

II_s_n
I

Roofing

\

f'_'dsuPP'ied
--

_,

\

(f!eld I

ll_i!_ II

mate_al

IL

- tl_iill
/IS_!II

_li

supplied)

II-_Uuctwork /

II ,i_,dsupp,ed/

Roof Curb for Small Cabinet

Roof Curb for

Note A:When unit mounting screw is used
retainer bracket must also be used.

Large Cabinet

Note A:When unit mounting screw is used
retainer bracket must also be used.

Supply opening
(BxC)

445/16"

R/A

S/A

\,
\
Insulated
deck pan

-'---'-- GaSkec,tua_Ou
nd.

/

_

Gasket around
outer edge
\

C00076

CATALOG
NUMBER

A
IN. (MM)

B
IN. (MM)

CPRFCURB006A00

8 (203)

11 (279)

16-1/2

(419)

28-3/4

CPRFCURB007A00

14 (356)

11 (279)

16-1/2

(419)

28-3/4

UNIT SIZE

48XP024-036

CPRFCURB008A00

48XP042-060

8 (203)
14 (356)

CPRFCURB009A00

16-3/16
16-3/16

C
IN. (MM)

(411)
(411)

17-3/8
17-3/8

D
IN,

(441)
(441)

(MM)
(730)
(730)

40-1/4

(1022)

40-1/4

(1022)

NOTES:
1. Roof curb must be set up for unit being installed.
2.

Seal

3.

Roof

strip

4.

Attach

5.

Insulated

d.

When

curb

must

ductwork
panels:
unit

conditions.

be applied,

is made

to curb
1-in.

mounting
This

as required,

of 16-gauge
(flanges
(25 mm)
screw

bracket

to unit

being

installed.

steel.
of duct
thick

is used

is available

rest on curb).

fiberglass

(see Note
through

1 lb (.45
A), a retainer

kg)

density.

bracket

must

be used

as well.

This

bracket

Micrometl.

Fig. 4 - Roof Curb

Dimensions

must

also be used when

required

by

code

for hurricane

or seismic

Unit

SMALL CABINET
030

024
Ib

Rigging
Weight

kg

351

Ib

159

NOTE: See dimensional

036

kg

355

Unit

Ib

161

042

kg

379

Rigging
Weight

172

LARGE CABINET
048

060

Ib

kg

Ib

kg

Ib

kg

427

194

477

216

522

237

drawing for corner weights.

Fig. 5 - 48XP

Rigging

Weights

DUCTS

SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB

BASEPAN SLOT (BELOW
BEFORE RIGGING

HANDHOLDS)

C99015

U NIT 48XP

A

B

in.
22.0
22.0
22.0
20.0
21.5
23.5

024
030
036
042
048
060

in.
14.50
14.50
15.30
21.25
16.3
16.3

mm

558.5
558.5
558.5
508.0
546.1
596.9
Fig. 6 - Suggested

mm
368.3
368.3
388.6
539.8
414.0
414.3

Rigging

Step 5 -- Rig and Place Unit
Rigging

and handling

many reasons
due
structures, etc.).
Only

trained,

should

handle

When

working

of this equipment

to the

installation

can

be hazardous

location

(roofs,

for

elevated
PERSONAL

qualified

crane

operators

and ground

support

staff

this equipment,

observe

precautions

in the

literature, on tags, stickers, and labels attached to the equipment,
and any other safety precautions
that might apply.
Use spreader

bars or crate top when

rigging

the unit.

The

all rigging and moving
operations.
The unit must be level for
proper condensate
drainage;
therefore,
the ground-level
pad or
accessory
roof curb must be level before setting the unit in place.
a field-fabricated
support is used, be sure that the support is
and properly supports
the unit. Lifting point should be

directly

UNIT

over the center of gravity

FALLING

Failure to follow
iniury or death.
Never stand beneath

for the unit.

Failure to follow
iniury or death.
Never exceed

result

in personal

Step 6 -NOTE:
comply
Model

Connect

When

Condensate

installing

with local codes
48XP

disposes

condensate

drain connection

be sure to

and restrictions.
of condensate

fitting which exits through
and 3 for location).
Condensate

Drain

water through

the compressor

water can be drained

directly

a 3/4 in. NPT

access panel (See Fig. 2
onto the roof in rooftop

sure that the outlet of the trap is at least 1 in. (25 mm) lower than
the drain-pan
condensate
connection
to prevent the pan from

this warning

INJURY

could

Accessory lifting kit is only to be used with Small Packaged
units which have a composite unit base with molded rigging
holds.

could

result

in personal

units or lift over people.

overflowing
(See Fig. 7). Prime the trap with water. When
gravel apron, make sure it slopes away from the unit.
If the installation
requires draining
from the unit, install a 2-in. (51
connection
the outlet
condensate

PERSONAL

warning

installations
(where
permitted)
or onto
a gravel
apron
in
groundlevel
installations.
Install a field-supplied
condensate
trap
at end of condensate
connection
to ensure proper drainage. Make

HAZARD

rigged

HAZARD

this

units

must be rigged for lifting (See Fig. 6). Refer to Table 1 for
operating
weight. Use extreme caution to prevent damage when
moving the unit. Unit must remain in an upright position during

When
level

INJURY

to follow

iniury/death.

and install this equipment.
with

Failure

HAZARD

this warning

Prime
could

200 lb (91 kg) per bracket

result

in personal

lifting force.

using a

the condensate
water away
mm) trap at the condensate

to ensure proper drainage (See Fig. 7). Make sure that
of the trap is at least 1 in. lower than the drain-pan
connection.
This prevents the pan from overflowing.

the trap with water. Connect

a drain tube - using a minimum

of 3/4-in. PVC or 3/4-in. copper pipe (all field-supplied)
outlet end of the 2-in. (51 mm) trap. Do not undersize
Pitch the drain tube downward
at a slope of at least l-in.

- at the
the tube.
(25 mm)

for every 10 ft (3 m) of
tube for leaks.

the drain

horizontal

run. Be sure to check

1" (25 mm)

absence of local building
recommendations:

MIN.

._L

TRAP
OUTLET

Z

_..'__-j__

1. Avoid
2"(51

mm)M

IN.

heating
Trap

flue

hood

assembly

is shipped

in the return

indoor blower compartment
cover to locate the assembly.

(See Fig. 9). Remove

Dedicated

MUST

low NOx

models

Quality Management

Districts

be installed

section

of the

the return

duct

in California

Air

where a Low NOx rule exists. These

models meet the California maximum
oxides
emissions requirements
of 40 nanograms/joule

of nitrogen (NOx)
or less as shipped

from the factory.
NOTE:
Low
installations.

PERSONAL

NOx

requirements

INJURY

AND UNIT

apply

only

DAMAGE

to

natural

gas

HAZARD

Failure to follow this warning could result in personal
or death and unit component
damage.

injury

The venting system is designed to ensure proper venting. The
flue hood assembly
must be installed as indicated in this
section of the unit installation instructions.

Install the flue hood
1. This

as follows:

installation

must

conform

with

local

building

codes

and with the National
Fuel Gas Code (NFGC),
NFPA
54/ANSI
Z223.1
(in Canada,
CAN/CSA
B149.1,
and
B149.2)
latest revision.
Refer to Provincial
and local
plumbing
or wastewater
codes and other applicable
local
codes.
2. Remove flue hood from shipping location (inside the return
section of the blower compartment-See
Fig. 9). Place vent
cap assembly over flue panel. Orient screw holes in vent cap
with holes in the flue panel.
3. Secure flue hood to flue panel by inserting a single
the right side and the left side of the hood.

screw on

Step 8 -- Install Gas Piping
The gas supply pipe enters the unit through the access hole
provided.
The gas connection
to the unit is made to the l/2-in.
FPT gas inlet on the manual shutoff or gas valve.
Install a gas supply line that runs to the heating section. Refer to
Table 2 and the NFGC for gas pipe sizing. Do not use cast-iron
pipe. It is recommended
that a black iron pipe is used. Check the
local utility for recommendations
concerning
existing lines. Size
gas supply piping for 0.5 IN. W.C. maximum
pressure drop. Never
use pipe smaller than the l/2-in.
FPT gas inlet on the unit gas
valve.
For natural

gas applications,

the gas pressure

at unit gas connection

must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C.
while the unit is operating.
For propane
applications,
the gas
pressure must not be less than 7.0 IN. W.C. or greater than 13 IN.
W.C. at the unit connection.
An

l/8-in.

NPT

connection,
must
supply connection

plugged

tapping,

accessible

be installed
immediately
to the gas valve.

2. Protect
thermal

Step 7 -- Install Flue Hood
The

for

upstream

test
of the

adhere

to the following

pertinent

low spots in long runs of pipe. Grade all pipe 1/4 in.

(6 mm)
in every 15 ft (5 m) to prevent traps. Grade
horizontal runs downward
to risers. Use risers to connect

A08001

Fig. 7 - Condensate

codes,

gage
gas

When installing the gas supply line, observe local codes pertaining
to gas pipe installations.
Refer to the NFPA 54/ANSI
Z223.1, in
Canada
CAN/CSA-BI49.1
and B149.2
latest editions.
In the

section

and to meter.

all segments
damage.

all
to

of piping

Support

system

all piping

against

physical

with appropriate

and

straps,

hangers, etc. Use a minimum of one hanger every 6 ft (2 m).
For pipe sizes larger than 1/2 in., follow recommendations
of national codes.
3. Apply joint compound
(pipe dope)
male threads of joint when making

sparingly
and only to
pipe connections.
Use

only pipe dope that is resistant
to action
of liquefied
petroleum gases as specified by local and/or national codes.
Never use Teflon tape.

Table
UNIT SIZE 48XP
NOMINAL CAPACITY (ton)
SHIPPING WEIGHT (Ib)
(kg)
COMPRESSORS
Quantity
REFRIGERANT (R-410A)
Quantity (Ib)
(kg)
REFRIGERANT METERING
DEVICE
CONDENSER COIL
Rows...Fins/in.
Face Area (sq ft)
CONDENSER FAN
Nominal Cfm
Diameter (in.)
(me)
Motor Hp (Rpm)
EVAPORATOR COIL
Rows...Fins/in.
Face Area (sq ft)
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
Size (in.)
(me)
Motor (hp)
FURNACE SECTION*

1 - Physical

024040
2
388
176

Data

024060
2
388
176

- Unit
030040
2-1/2
392
178

48XP
030080
2-1/2
392
178

036090
3
416
189

042060
3-1/2
464
210

042090
3-1/2
464
210

9.5
4.3

9.5
4.3

10.7
4.9.

10.7
4.9

036080
3
416
189
Scroll
1

7.3
3.3

7.3
3.3

8.0
3.6

8.0
3.6
TXV

2...21
11.95

2...21
11.95

2...21
11.95

2...21
11.95

2...21
13.7

2...21
13.7

2...21
15.4

2...21
15.4

2350
22
559

2350
22
559

2350
22
559

2350
22
559

2800
22
559

2800
22
559

2800
22
559

2800
22
559

1/8 (825)

1/8 (825)

1/8 (825)

1/8 (825)

1/8 (825)

1/8 (825)

1/8 (825)

1/8 (825)

3...15
3.7

3...15
3.7

3...15
3.7

3...15
3.7

4...15
3.7

4...15
3.7

3...15
3.7

3...15
3.7

770
10x10
254x254
1/2

770
10x10
254x254
1/2

960
10x10
254x254
1/2

960
10x10
254x254
1/2

1150
1 lx10
279x254
3/4

1150
1 lx10
279x254
3/4

1400
1 lx10
279x254
3/4

1400
1 lx10
279x254
3/4

2...44
2...38
2...44
2...38
2...38
3...38
2...38
2...38
Burner Orifice No. (Qty._Drill Size) Natural Gas
2...50
2...46
2...50
2...46
2...46
3...46
2...46
2...46
Burner Orifice No. (Qty._Drill Size) Propane Gas
HIGH-PRESSURE
SWITCH (psig)
650 +/-15
420 +/-25
Cut-out Reset (Auto)
LOSS-OF-CHARGE
/ LOW-PRESSURE
SWITCH
20 +/-5
(Liquid Line) (psig) Cut-out
45 +/-10
Reset (auto)
RETURN-AIR
FILTERS Throwawayt
20x24x1
24x30x1
(in.)
508x610x25
610x762x25
(mm)
*Based on altitude of 0 to 2000 ft (0-610 m).
1-Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the heating airflow velocity of
300 ft/minute for high-capacity
type. Air filter pressure drop for non-standard
filters must not exceed 0.08 IN. W.C..

Table
1 - Physical
Data - Unit 48XP
(Continued)
UNIT SIZE 48XP
048090
048115
048130
060090
NOMINAL CAPACITY (ton)
4
4
4
5
SHIPPING WEIGHT (Ib)
512
512
512
559
(kg)
232
232
232
254
COMPRESSORS
Scroll
Quantity
1
REFRIGERANT (R-410A)
Quantity (Ib)
11.25
11.25
11.25
13.2
(kg)
5.1
5.1
5.1
6.0
REFRIGERANT METERING DEVICE
T; IV
CONDENSER COIL Rows...Fins/in.
2...21
2...21
2...21
2...21
Face Area (sq ft)
17.4
17.4
17.4
19.3
CONDENSER FAN
Nominal Cfm
3300
3300
3300
3300
Diameter (in.)
22
22
22
22
(mm)
559
559
559
559
Motor Hp (Rpm)
1/4 (1100)
1/4 (1100)
1/4 (1100)
1/4 (1100)
EVAPORATOR COIL
Rows...Fins/in.
4...15
4...15
4...15
4...17
Face Area (sq ft)
4.7
4.7
4.7
5.7
EVAPORATOR BLOWER
Nominal Airflow (Cfm)
1400
1400
1400
1710
Size (in.)
1lx10
1lx10
1 lx10
1 lx10
(mm)
279x254
279x254
279x254
279x254
Motor (hp)
3/4 (1075)
3/4 (1075)
3/4 (1075)
1.0 (1040)
FURNACE SECTION*
Burner Orifice No. (Qty...Drill Size) Natural Gas
3...38
3...33
3...31
3...38
Burner Orifice No. (Qty._Drill Size) Propane Gas
3...46
3...42
3...41
3...46
HIGH-PRESSURE
SWITCH (psig)
Cut-out
650 +/-15
Reset (Auto)
420 +/-25
LOSS-OF-CHARGE
/ LOW-PRESSURE
SWITCH (Liquid
Line) (psig)
20 +/-5
Cut-out
Reset (auto)
45 +/-10
RETURN-AIR
FILTERS Throwaway'[" (in.)
24x30x1
(mm)
610x762x25
*Based on altitude of 0 to 2000 ft (0-610 m).
1-Required filter sizes shown are based on the larger of the ARI (Air Conditioning and Refrigeration Institute) rated cooling airflow or the
300 if/minute for high-capacity
type. Air filter pressure drop for non-standard
filters must not exceed 0.08 IN. W.C..

060115
5
559
254

060130
5
559
254

13.2
6.0

13.2
6.0

2...21
19.3

2...21
19.3

3300
22
559
1/4 (1100)

3300
22
559
1/4 (1100)

4...17
5.7

4...17
5.7

1710
1 lx10
279x254
1.0 (1040)

1710
1 lx10
279x254
1.0 (1040)

3...33
3...42

3...31
3...41

heating airflow velocity of

Table
2- Maximum
Gas
NOMINAL
IRON PIPE,
SIZE (IN,)
1/2
3/4
1
11/4
11/2

INTERNAL
DIAMETER
(IN,)
.822
.824
1.049
1.380
1.810

Flow

Capacity*

LENGTH
10
(3)
175
380
880
1400
2100

20
(8)
120
250
485
950
1480

30
(9)
97
200
375
770
1180

40
(12)
82
170
320
800
990

50
(15)
73
151
285
580
900

OF PIPE,

80
(18)
88
138
280
530
810

70
(21)
81
125
240
490
750

FT (m)t

80
(24)
57
118
220
480
890

90
(27)
53
110
205
430
850

100
(30)
50
103
195
400
820

125
(38)
44
93
175
380
550

150
(48)
40
84
180
325
500

175
(53)
-77
145
300
480

200
(81)
-72
135
280
430

* Capacity of pipe in cuft of gas per hr for gas pressure of 0.5 psig or less. Pressure drop of 0.5-IN. W.C. (based on a 0.60 specific gravity gas). Refer to Table 2
and the NFGC NFPA 54/ANSI Z223.1.
1-This length includes an ordinary

number of fittings.

4. Install sediment trap in riser leading to heating section (See
Fig. 8). This drip leg functions as a trap for dirt and
condensate.
FIRE

IN

OR EXPLOSION

HAZARD

Failure to follow this warning could result in personal iniury,
death and/or property damage.
-Connect gas pipe to unit using a backup wrench to avoid
damaging gas controls.
-Never purge a gas line into a combustion chamber. Never test
for gas leaks with an open flame. Use a commercially available
soap solution made specifically for the detection of leaks to
check all connections.

TEE

-Use proper length of pipe to avoid stress on gas control
manifold.
NIPPLE

-If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at furnace
gas valve and extend a nfininmm of 2 in. (51 ram) outside
furnace casing.

CAP

C99020

Fig. 8 - Sediment Trap
5. Install an accessible, external, manual main shutoff valve in
gas supply pipe within 6 ft (2 m) of heating section.
6. Install ground-joint union close to heating section between
unit manual shutoff and external manual main shut-off
valve.
7. Pressure-test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping
to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig. Pressure test the
gas supply piping system at pressures equal to or less than 0.5 psig.
The unit heating section must be isolated from the gas piping
system by closing the external main manual shutoff valve and
slightly opening the ground-joint union.

-If codes allow a flexible connector, always use a new
connector, do not use a connector which has previously
serviced another gas appliance.
8. Check
for gas leaks at the
field-installed
and
factoryinstalled gas lines after all piping connections have
been completed. Use soap-and-water solution (or method
specified by local codes and/or regulations).

Step 9 --

Install Duct Connections

The unit has duct flanges on the supply- and return-air openings
on the side and bottom of the unit. For downshot applications, the
ductwork connects to the roof curb (See Fig. 2 and 3 for
connection sizes and locations).
CONFIGURING
UNITS FOR DOWNFLOW
_VERTICAL)

DISCHARGE

ELECTRICALSHOCK

HAZARD

Failure to follow this warning could result in personal iniury
or death.
Before installing or servicing system, always turn off and tag
lockout main power to system, There may be more than one
disconnect switch,

1.Open
allelectrical
disconnects
before
starting
anyservice
work.
2.Remove
horizontal
(metal)
ductcovers
toaccess
vertical
(downflow)
discharge
ductknockouts
inunitbase.
3.Useascrewdriver
andhammer
toremove
thepanels
inthe
bottom
oftheunitbase
(See
Fig.9& 10).

PROPERTY
Failure

DAMAGE

HAZARD

to follow this caution

may result in property

Collect ALL screws that were removed.
on rooftop

as permanent

damage

5. It is recommended
perimeter

that

of the vertical

to the roof may occur.
the

base

insulation

return-air

opening

the base with aluminum
tape. Applicable
require aluminum
tape to prevent exposed
6.

damage.

Do not leave screws

around

the

be secured

local codes
fiberglass.

to
may

Cover both horizontal
duct openings
with the provided
duct covers. Ensure opening is air- and watertight.

7. After completing
unit conversion,
and power up unit.

perform

all safety

checks

NOTE:
The design and installation of the duct system nmst be in
accordance
with the standards
of the NFPA for installation
of
nonresidence-type
90A or
ordinances.

I

I

Adhere
to the following
installing the duct system:

i'
RETURN
DUCT
OPENING

SUPPLY
DUCT
OPENING

1. Units
C99011

Fig. 9 - Supply

and Return

air conditioning

residence-type,

are

removing

Duct Opening

shipped

and ventilating

NFPA

90B;

criteria

when

for

and/or

horizontal

systems,
local

selecting,
duct

NFPA

codes

sizing,

and

and

installation

(by

duct covers).

2. Select
and
size
ductwork,
supply-air
registers,
and
return-air
grilles according to American Society of Heating,
Refrigeration
and Air Conditioning
recommendations.

Engineers

(ASHRAE)

3. Use flexible transition between
rigid ductwork
and unit to
prevent transmission
of vibration.
The transition
may be
screwed or bolted to duct flanges. Use suitable
ensure weather tight and airtight seal.

gaskets

4. All units must have field-supplied
filters or accessory
rack
installed
in the
return-air
side
of the
Recommended
sizes for filters are shown in Table 1.

to

filter
unit.

5. Size all ductwork
for maximum
required
airflow (either
heating or cooling)
for unit being installed.
Avoid abrupt
duct size increases or decreases
or performance
may be
affected.
6. Adequately

insulate

and weatherproof

all ductwork

located

outdoors.
Insulate
ducts passing
through
unconditioned
space, and use vapor barrier in accordance
with latest issue
of Sheet

Metal and Air Conditioning

Contractors

National

Association
(SMACNA)
and Air Conditioning
Contractors
of America
(ACCA)
n_ininmm
installation
standards
for
heating and air conditioning
systems. Secure all ducts to
VERTICAL DUCT COVERS

building
7. Flash,

C99012

Fig. 10 - Vertical
4. If unit ductwork

Duct Cover

is to be attached

on the unit base (jackstand
time.

to vertical

applications

building
building

Removed
opening

only),

flanges

do so at this

10

structure.
weatherproof,
structure
practices.

and vibration-isolate
in accordance

all openings

with local codes

in

and good

Step 10 -- Install Electrical

Connections
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING

r
I¢_

LABEL)

ELECTRICALSHOCK

" " "

Lc_

HAZARD

Failure to follow this warning
or death.

could result in personal

injury
mmm
FIELD-SUPPLIED
FUSED DISCONNECT

GND

The unit cabinet must have an uninterrupted,
unbroken
electrical ground. This ground may consist of an electrical
wire connected
to the unit ground screw in the control
compartment,
or conduit approved for electrical ground when
installed in accordance
with NEC, NFPA 70 National Fire
Protection Association
(latest edition) (in Canada, Canadian
Electrical Code CSA C22.1) and local electrical codes.

CONTROL

BOX
OO-

YZL£Y)--D.i Z-,,'_
,THERMOSTAT
(TYPICAL)

GR._(e_)
_. i-¢n_

LOW-VO LTAG E
POWER LEADS(SEE UNIT
WIRING LABEL)

_J

O_

RE DZR2,
1>.i-f_

O-

BREC_)
_ i"(-€3

O=

SPLICE

UNIT

COMPONENT

DAMAGE

LEGEND

HAZARD

Failure to follow this caution could result in damage
being installed.
1. Make

all electrical

NFPA
70
governing
connections
C22.1

connections

in accordance

2. Use

Canadian
only

Field Control-Voltage Wiring
Field High-Voltage Wiring
.......

to the unit

A08476
Fig. ll

with NEC

Three-phase

(latest edition)
and local electrical
codes
such
wiring.
In Canada,
all electrical
must be in accordance
with CSA standard
Electrical

Code

local codes. Refer to unit wiring
copper

conductor

field-supplied
electrical
NOT USE ALUMINUM

1.

Part 1 and applicable

for connections
switch

- High and Control-Voltage

Run the high-voltage
the control box.
ground

and unit. DO

4. Connect

field

compressor
3. Be sure
operating
3-phase

that high-voltage
power
to unit is within
voltage range indicated on unit rating plate. On
units, ensure
phases are balanced
within
2

percent. Consult local power company for correction
improper voltage and/or phase imbalance.

as high-voltage

5. Do not damage
internal
through any panel to mount
etc.

HIGH-VOLTAGE

6. Connect

of

SPECIAL

components
when
electrical hardware,

on connection

to the lines
11 of the

wire on connection

13 of

field wire L3 to Blue wire from compressor.

PROCEDURES FOR 208-V OPERATION

Failure to follow
or death.

separate
electrical
disconnect
switch

service
mounted

with
at,

a
or

HAZARD

this warning

could result in personal

injury

Make sure the power supply to the unit is switched OFF before
making any wiring changes. With disconnect
switch open,
move yellow wire from transformer
(3/16 in.) terminal
marked 230 to terminal marked 208. This retaps transformer
to primary voltage of 208 vac.

to the unit rating plate for
and minimum
circuit amps

for wire sizing.

entry points

wire

connected

drilling
conduit,

The field-supplied
disconnect
switch box may be mounted
on the
unit over the high-voltage
inlet hole when the standard power and
low-voltage

to black

wires

connection.

contactor.

ELECTRICALSHOCK

within sight from, the unit. Refer
maximum
fuse/circuit
breaker
size
(ampacity)

LI

ground

leads into

wires.

CONNECTIONS

The unit
must
have
a
field-supplied,
waterproof,

lead to chassis

5. Connect field wire L2 to yellow
the compressor
contactor.

4. Insulate low-voltage
wires for highest voltage contained
within conduit when low-voltage
control wires are in
same conduit

(L1, L2, L3) and ground

3. Locate the black and yellow
side of the contactor.

between

Connections

units:

2. Connect

diagram.

disconnect
WIRE.

BOX

are used (See Fig. 2 and 3 for acceptable

location).
See unit wiring label and Fig. 11 for reference when making high
voltage connections.
Proceed as follows
to complete
the high
voltage
Single

connections
phase

ELECTRICAL

to the unit.

2. Connect

ground

(L1,

L2) and ground

lead to chassis

3. Connect L1 to pressure
contactor.

ground

lug connection

4. Connect
L2 to pressure
compressor
contactor.

leads into the

HAZARD
iniury

Before making any wiring changes, make sure the gas supply
is switched off first. Then switch off the power supply to the
unit and install lockout tag.

connection.
11 of the compressor

CONTROL
lug

FIRE/EXPLOSION

Failure to follow this warning could result in personal
or death and property damage.

units:

1. Run the high-voltage
control box.

SHOCK

connection

23

of

VOLTAGE

CONNECTIONS

the
Do not use any type of power-stealing
problems may result.

11

thermostat.

Unit

control

Useno.18American
WireGage
(AWG)
color-coded,
insulated
(35Cminimum)
wirestomake
thecontrol
voltage
connections
between
thethermostat
andtheunit.If thethermostat
is located
morethan100ft (30m)fromtheunit(asmeasured
along
the
control
voltage
wires),
useno.16AWGcolor-coded,
insulated
(35
Cminimum)
wires.
Locate
thesixlowvoltage
thermostat
leads
in24voltsplice
box.
SeeFig.11forconnection
diagram.
Runthelow-voltage
leads
fromthethermostat,
through
thecontrol
wiringinletholegrommet
(Fig.2 and3),andintothelow-voltage
splice
box.Provide
adrip
loopbefore
running
wiresthrough
panel.
Secure
andstain
reliefall
wires
sothattheydonotinterfere
withoperation
ofunit.
Easy Select
EASY

TM

SELECT

-

9 PIN CONNECTOR

ICM PRINTED CIRCUIT BOARD '_--_
r"m
SEC1

48XP
CONFIGURATION

TM

TAPS FOR 48XP

Easy Select taps are used by the installer

to configure

ECM motor uses the selected taps to modify
pre-programmed
table of airflows.

a system. The

its operation

to a

The unit must be configured
to operate properly
with system
components
with which it is installed. To successfully
configure
a
basic system

(see information

next to select pins),
match the components

printed

on circuit board

move the 6 select wires
used (See Fig. 12).

a. GAS HEAT/CFM-SELECT
Factory
label.
b. AC/HP
Factory

selected
SIZE-

to capacity
conditioner

to the pins

SYSTEM

air conditioner

correspond

SYSTEM

12 PIN CONNECTOR
C01039

Fig. 12 - Detail

(4.) ENH-

SPEED WHEN
CONTINUOUS

The AC/HP CFM Adjust select is factory set to the
NOM tap. The CFM Adjust selections NOM/LO will

Four motor
customize

operation
and enhance

as indicated).
Selection options

delay profiles
system

are provided

operation

for

circuit

5-amp automotive
transformer
SEC2

to

50 percent

FAN

cooling

to MED, 65 percent

FUSING

AND

is fused by a board-mounted

fuse placed in series with the
and the R circuit. The C circuit

of the

transformer
is referenced to chassis ground through a
printed circuit run at SEC1 connected
to metal standoff

(See Fig. 12, E

marked
h. BASIC

with ground
UNIT

symbol.

CONFIGURATION

The following basic configuration
of the indoor motor
will provide ARI rated performance
of the 48XP. This
BASIC CONFIGURATION
should be used when the

and 45 sec off delay.

rated ARI performance

(2.) A 30 sec cooling delay with no airflow/90
sec off
delay at 100 percent airflow profile is used when it
is desirable to allow system coils time to
with the airflow

setting,

CIRCUIT

The low-voltage

DELAY

are:

cool-down
in conjunction
heating mode.

IS SET ON

g. LOW-VOLTAGE
REFERENCE

(1.) The standard 90 sec off delay (Factory Setting) at
100 percent airflow in cooling mode. In heating
mode, IGC will control 45 sec on delay with no
airflow

DESIRED

THERMOSTAT
FAN

(3.) HI speed-Move
connector to HI, 100 percent
cooling mode airflow (See Fig. 12, F as indicated).

(See Fig. 12, D as indicated).
DESIREDTIME

for 48XP

(2.) MED speed-Move
connector
cooling mode airflow.

10 percent airflow below nominal unit size
Adjust selection options are provided to adjust

SELECT

Board

FAN--SELECT

(1.) LO speed-Factory
mode airflow.

regulate airflow supplied for all operational
modes,
except non-heat
pump heating modes. HI provides 15
percent airflow over nominal unit size selected and LO

e. ON/OFF DELAYPROFILE

Not recommended

f. CONTINUOUS

LOW,

airflow supplied to meet individual
installation needs
such things as noise, comfort, and humidity removal

Printed-Circuit

in cooling mode. In heating mode IGC will control
45 sec on delay with no airflow and 45 sec off
delay.

TYPE

NOMINAL,

of SPP

(3.) A no delay option used for servicing unit or when
a thermostat is utilized to perform delay functions

This

Factory selected on 48XP for AC-Air conditioner.
For Gas Heat/Electric
Cool Unit-AC
must be selected.

provides
selected.

GRY ==_

correspond

INSTALLED

d. AC/HP CFM ADJUST-SELECT
OR HIGH AIRFLOW

HUM2

HEATER/MOTOR

of unit installed. Installer should verify air
size to ensure that airflow delivered falls

TYPE--SELECT

AUX2

SIZE
to unit

SIZE INSTALLED

size should

within proper range for the size unit installed.
applies to all operational
modes.
c. SYSTEM

which

GAS HEAT INPUT

SELECT

HUM1

24VAC

gas heat size should

selected

AUX1

label located

enhancements

is required,

(1.) HEAT-Factory

selected

(2.) AC/HP Size-Factory
please verify.

in

(3.)

SYSTEM
AC-AIR

(4.) AC/HP
(5.)

ON/OFF

are not needed.

to match heat input size.

selected

TYPE-Factory
CONDITIONER.

DELAY-Factory

to match system

selected

CFM ADJUST-Select

(Do Not Use ENH profile
12

or if system

such as super dehumidify

on 48XP

size,

system

NOM.
selected

0/90 profile.

for Gas Packaged

Units)

c. HUMIDIFIER/HUMIDISTAT

(6.) CONTINUOUS FAN-Select desired fan speed
when thermostat is set to continuous fan.
i. COMFORT OPTIONS--SUPER
DEHUMIDIFY (See
Quick Reference Guide)
The Super Dehumidify option is possible when this unit
is installed with a field supplied Thermidistat _ control
(SuperDehumidify does not require an outdoor
temperature sensor). The following configuration is
recommended for n_axinmm cooling/dehumidifying
comfort. This configuration will improve the comfort
provided by the air conditioning system if more
humidity removal is desired. While providing this
improved comfort, the system will operate efficiently,
but not at the published ARI SEER efficiency. During
cool-to-dehumidify
call, it provides maximum
dehumidification by reducing airflow to a n_ininmm.
The actual super dehumidify command from
Thermidistat control to the indoor unit is a :'Y" signal
without a :'G" signal in addition to dehumidify signal.
The indoor unit responds to this combination by
reducing the airflow to a n_ininmm. All other
characteristics of cool to dehumidify are the same. The
following system configuration is recommended for
n_axinmm cooling/dehumidifying comfort (See Fig. 12).
(1.) HEAT-Factory selected to match gas heat size of
unit installed.
(2.) AC/HP Size-Factory
please verify.

humidifier through a standard
These terminals are energized

Zone II, the 24-v.
the Thermidistat
d. DEHUMIDIFY
HUMIDISTAT

signal

using a
Plus or Comfort

may be sourced

directly

from

HUM terminal (See Fig. 12, 13 & 14).
CAPABILITY
WITH STANDARD
CONNECTION

requirement,
the ECM board provides connection
terminals for use of a standard humidistat.
The unit will
detect

the humidistat

contacts

opening

on increasing

humidity
and reduce its airflow to approximately
80
percent of nominal cooling mode airflow. This reduction
will increase the system latent capacity until the
humidity falls to a level which causes the humidistat to
close its contacts. When the contacts close, the airflow
will return to 100 percent
activate

this mode,

remove

of selected
jumper

cooling

airflow.

To

J1 and wire in a

standard humidistat (See Fig. 14).
e. DEHUMIDIFY
AND SUPER DEHUMIDIFY
CAPABILITIES
This model unit is capable

of responding

to a signal

from indoor system control (Thermidistat
or capable
zoning control) to operate in comfort control modes
such as Super Dehumidify
Mode. Consult literature
provided with indoor system control to determine if
these operating modes are available, and to see control
set up instructions.
No special setup or wiring of unit is

(6.) CONTINUOUS FAN-Select desired fan speed
when thermostat is set to continuous fan.

required.

J1 jumper to

HUMIDISTAT

NOTE: J1 jumper should only be removed when a Thermidistat,
humidistat or capable zoning control is installed.

HUM 1FI

(c)

(8.) LOW VOLTAGE CONNECTIONS-Make
connections as shown in ELECTRICAL
CONNECTIONS section.

24-VAC

TERMINALS

_
J

HUM 2[7

(G)

(9.) CONFIGURE THERMIDISTAT-Follow
Thermidistat (or capable zoning system)
installation instructions for Super Dehumidify
operation.
ACCESSORY
INSTALLATION
AUXILIARY

(See Fig. 12).
when G

Latent capacities for this unit are better than average
systems. If increased latent capacity is an application

(4.) AC/HP CFM ADJUST-Select NOM.
(5.) ON/OFF DELAY-Select :'0/0" profile.

a.

humidistat
with 24-v.

and C on the 9 pin connector. When
Thermidistat
Control, Zone Comfort

selected to match system size,

MODE-Remove

Easy

thermostat signal is present (See Fig. 13 & 14).
Alternately,
the 24-v. signal may be sourced from the W

(3.) SYSTEM TYPE-Factory selected on 48XP system
AC-AIR CONDITIONER.

(7.) DEHUMIDIFY
activate.

CONNECTIONS

Select Board terminals HUM1 and HUM2 are provided
for direct connection to the low-voltage
control of a

HUMIDIFIER

TO HUMIDIFIER

WIRING
A95317

Fig. 13 - Humidifier

Wiring

- 48XP

EASY SELECTIq
BOARD TERMINALF]
BLOCK

The AUX and HUM

terminals on the Easy Select Board are tied directly to
the G terminal, and provide a 24-v. signal whenever the
G terminal
dehumidify

is energized (See Fig. 12). During
mode, the G signal is not present

Super
and the

auxiliary terminals are not energized. If the installation
includes the use of this operating mode, do not use these
terminals to control accessories.
See Electronic Air
Cleaner and Humidifier
sections for further information.
b. ELECTRONIC

AIR CLEANER

using an electronic

I

REMovEJ

I

HUMIDISTAT

l

JUMPER

CONNECTIONS

The AUXI and AUX2 terminals are not always
energized during blower operations,
as described
When

1

J1

A95316

Fig. 14 - Humidistat

above.

Wiring

for De-Humidify

Mode

- 48XP

air cleaner with the unit, use

Airflow Sensor (See Air Cleaner Price Pages for Part
Number). The airflow sensor turns on electronic air
cleaner when the blower is operating.

TRANSFORMER

PROTECTION

The transformer is of the energy-limiting
a 30-sec. overload or shorted secondary

13

type. It is set to withstand
condition.

PRE-START-UP

a. Make

sure gas line is free of air. Before lighting

for the first time, perform the following
valve in the "OFF" position:

the unit

with the gas

If the gas supply pipe was not purged before connecting
the unit, it will be full of air. It is recommended
that the

FIRE, EXPLOSION,

ELECTRICAL

SHOCK HAZARD

ground joint union be loosened, and the supply line be
allowed to purge until the odor of gas is detected. Never

Failure to follow this warning could result in personal injury,
death or property damage.

purge gas lines into a combustion
chamber. Immediately
upon detection of gas odor, retighten the union. Allow 5

1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.

minutes
b. Make

2. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.

positioned

d. Make

on all WARNING,
labels attached to, or

a. Inspect for shipping and handling damages such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak.

1/8" (3 mm)
MOTORAND

e. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.

maximum

from motor

is in place.
drain trap is filled with water

MAX BETWEEN
FAN HUB

MOTOR

loose parts

SHAFT
A08474

Fig. 15 - Fan

Blade

Clearance

START-UP
Step 1 -- Check for Refrigerant Leaks
Proceed as follows
charge the unit:

to locate

and repair

a refrigerant

leak

and to

1. Locate leak and make sure that refrigerant system pressure
has been relieved
and reclaimed
from both highand
low-pressure
ports.
2. Repair
NOTE:

leak following

Refrigerant

Install a filter drier whenever

Service

procedures.

the system has been opened

for repair.
3. Add a small charge
and leak-test unit.

c. Leak test all refrigerant tubing connections using
electronic leak detector, halide torch, or liquid-soap
solution. If a refrigerant leak is detected, see the Check
for Refrigerant Leaks section.
d. Inspect all field- and factory-wiring connections. Be
sure that connections are completed and tight.

sure that air filter(s)

from fan

f. Make sure that all tools and miscellaneous
have been removed.

6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high- and low-pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.

2. Read and follow
instructions
CAUTION, and INFORMATION
shipped with, unit.
3. Make the following inspections:

edge of condenser-fan

be 1/2 in. (13 mm) maximum

e. Make sure that condensate
to ensure proper drainage.

while

Proceed as follows to inspect and prepare the unit for initial startu _:
1. Remove access panel.

blade is correctly

c. Ensure fan hub is 1/8 in. (3 mm)
housing (See Fig. 15).

4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant
leak is suspected
around compressor
terminals.
connection

then light unit.

in fan orifice. Leading

blade should
orifice.

3. Do not remove compressor terminal cover until all
electrical sources are disconnected and tagged.

5. Never attempt to repair soldered
refrigerant system is under pressure.

to elapse,

sure that condenser-fan

of R-410A

4. Evacuate and recover refrigerant
additional leaks are not found.
5. Charge

unit with R-410A

refrigerant

from refrigerant

refrigerant,

charging cylinder or accurate
for required charge.

vapor

using

to system
system

a volume

tric-

scale. Refer to unit rating plate

Step 2 -- Unit Sequence of Operation
48XP Sequence of Operation
a. CONTINUOUS

FAN

4. Verify the following conditions:
(1.) Thermostat
closes circuit R to G-The
at continuous
fan airfow.
b. COOLING

FIRE, EXPLOSION

Blower

runs

MODE

(1.) If indoor temperature
is above temperature
set
point and humidity is below humidity set point,
thermostat closes circuits R to G, R to Y/Y2 and R

HAZARD

Failure to follow this warning could result in personal injury,
death or property damage.

to O-The
airflow.

Do not purge gas supply into the combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections.

c. COOLING

unit delivers

single speed

cooling

MODE-DEHUMIDIFICATION

(1.) If indoor temperature
is above temperature
set
point and humidity is above humidity set point,
14

if

thermostat or Thermidistat

closes circuits R to G, R

this sequence

to Y/Y2, R to O and humidistat or Thermidistat
opens R to DH-The
unit delivers airflow which is
approximately
80 percent of the nominal cooling
airflow to increase the latent capacity of the system.
d. COOLING

MODE-SUPER

OPERATION
NOTE:

The indoor

capable

of

(SEE
control

providing

Dehumidify

control
must
be configured
instructions.
Consult
indoor
control

is capable

configuration

REFERENCE

GUIDE)

used, such as a Thermidistat,

Super

operation

mode

Super

Dehumidify

inputs

and

Check

GAS

•

pressure

is required

after

proceed

unit

start-up

(See

as follows:

The rated gas inputs shown in Table 3 are for altitudes

specific

(1.) If the indoor temperature
is below the temperature
set point and the humidity is above the humidity

gas with a heating

gravity,

or propane

Btu/ft 3 at 1.5 specific
•

from sea

value of 1050 Btu/ft 3 at 0.65
gas with a heating

value of 2500

gravity.

In the U.S.A. for elevations

above 2000 ft (610 mm), reduce

input 4% for each 1000 ft (305 m) above sea level. In Canada
for elevations

will deliver airflow at the full
plus dehumidify
mode

from 2001 ft (610 m) to 4500

sea leval reduce

requested value. If circuit R to G is open (0-v.) for
Super Dehumidify
mode, the motor delivers
reduced airflow to maximize the humidity removal
of the system while minimizing
over cooling.
e. GAS HEATING

and manifold

level to 2000 ft (610 m) above sea level. These inputs are based

and for

set point, the Thermidistat
closes circuit R to O,
opens circuits R to DH and R to G, and closes
circuit R to Y/Y2. If circuit R to G is closed

has

INPUT

gas input

on natural

the motor
or cooling

do not light within

fan will turn on 45 sec. after the flame

Table 3). If adjustment

instruction.

(24-v.),
cooling

If the burners

been established.
The evaporator
fan will turn off 45 sec.
after the thermostat has been satisfied.
CHECK

must be

as outlined
in its installation
control
literature
to determine
if

of providing

5. The evaporator

DEHUMIDIFY

QUICK

is repeated.

15 minutes from the initial call for heat, there is a lockout.
To reset the control, break the 24-v power to W.

•

When the gas supply
specific

gravity,

distributor

ft (1372 m) above

input 10%.
being

used has a different

refer to national

to determine

heating

value or

and local codes, or contact your

the required

orifice size.

MODE

(1.) Thermostat closes circuit R to W/WI-The
unit
delivers the selected gas heat airflow. The IGC will
control a 45 sec. blower
"Off"' delay.

Step 3 -- Start-Up
ments

UNIT

Heating

UNIT

"On" delay and a 45 sec.

COMPONENT

and Make Adjust-

DAMAGE

ADJUST

HAZARD

may result in damage

that

burner

operation may occur
misaligned.
Follow

the lighting

label (located inside
heating section.
NOTE:

Make

orifices

when the burner
instructions

CHECK

HEATING

Unstable

in the manifold

are

section

operation

door)

to start the

access

propane

gas units.

Measure

Gas Flow (Natural

has been purged,

the unit

and that all

for leaks.

thermostat

SYSTEM

and the fan switch

2. Set the heating
room temperature.
3. The induced-draft

temperature
motor

4. After a call for heating,

cooling

instructions

control

located

operation

inside

switch

in

is placed in AUTO
control

burner
the

All

other

turned off when
follows:

as
or

appliances

gas flow

3. Record number
one revolution.

HEAT

that

use the same

is measured

meter

at the meter.

must

be

Proceed

as

to unit.

of seconds

4. Divide number of seconds
seconds in one hr).

above

for gas meter

test dial to make

in Step 3 into 3600

(number

of

5. Multiply result of Step 4 by the number of cuft shown for
one revolution of test dial to obtain ft 3 of gas flow per hr.

will start.
the main burner

can be made by changing the
pressure
must be maintained

2. Remove pipe plug on manifold
(See Fig. 16) and connect
manometer.
Turn on gas supply to unit.

position.

of the thermostat

the gas flow

between 3.4 and 3.6 IN. W.C.. If larger adjustments
are required,
change main burner orifices following
the recommendations
of
national and local codes.

1. Turn off gas supply

for proper

by measuring

Gas Units)

Minor adjustment
to the gas flow
manifold
pressure.
The manifold

CONTROL

follows (see furnace lighting
blower access panel):
position

or blower

sure that gas supply

room

orifices

INPUT

at the meter or by measuring
the manifold pressure. Measuring the
gas flow at the meter is recommended
for natural gas units. The
manifold
pressure
must be measured
to determine
the input of

NOTE:

has been checked

Start and check

aligned.

on the heating

the burner

gas piping

1. Place

are properly

GAS

The gas input to the unit is determined

to the unit

Complete the required procedures given in the Pre-Start-Up
section before starting the unit. Do not jumper any safety
devices when operating the unit.
sure

HAZARD

Do Not redrill an orifice. Improper drilling (burrs,
out-of-round holes, etc.) can cause excessive burner noise
and misdirection of burner flame. Replace with correct sized
orifices.

Failure to follow this caution
being installed.

Make

DAMAGE

Failure to follow this caution may result in reduced unit and/or
component life.

should

6. Multiply

light within

obtain

5 sec. If the burners do not light, there is a 22-sec. delay
before another 5-sec. try. If the burners still do not light,

result
total

of Step 5 by Btu heating

measured

input

in Btuh.

value

Compare

of gas to
this value

with heating input shown in Table 3 (Consult the local gas
supplier if the heating value of gas is not known).

15

4. Remove cover screw over regulator adjustment screw on
gas valve.
5. Adjust regulator adjustment screw to the correct manifold
pressure, as specified in Table 3. Turn adjusting screw
clockwise to increase manifold pressure, or turn adjusting
screw counterclockwise to decrease manifold pressure.
6. Replace cover screw.
7. Turn off gas to unit. Remove manometer from pressure tap.
Replace pipe plug on gas valve, then turn on gas to unit.
Check for leaks.
CHECK BURNER FLAME
With burner access panel removed, observe the unit heating
operation. Watch the burner flames to see if they are light blue and
soft in appearance, and that the flames are approximately the same
for each burner. Propane will have blue flame with yellow tips (See
Fig. 17). Refer to the Maintenance section for information on
burner removal.
BURNER FLAME
MANIFOLD

PIPE

PLUG
C99019

BURNER

Fig. 16 - Burner Assembly
EXAMPLE: Assume that the size of test dial is 1 ft3, one
revolution takes 32 sec., and the heating value of the gas is 1050
Btu/ft3. Proceed as follows:
1. 1.32 sec. to complete one revolution.
2. 3600 + 32 = 112.5.

MAN IFOLD

3. 112.5 x 1 =112.5 ft3 of gas flow/hr.
4. 112.5 x 1050 = 118,125 Btuh input.
If the desired gas input is 115,000 Btuh, only a minor change in the
manifold pressure is required.
Observe manifold pressure and proceed as follows to adjust gas
input:
1. Remove cover screw over regulator adjustment screw on
gas valve.
2. Turn regulator adjustment screw clockwise to increase gas
input, or turn regulator adjustment screw counterclockwise
to decrease input. Manifold pressure nmst be between 3.4
and 3.6 IN. W.C.. Unsafe operation of the unit may result if
manifold pressure is outside this range. Personal injury or
unit damage may result.

FIRE AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal iniury
or death and/or property damage.
Unsafe operation of the unit may result if manifold pressure
is outside this range.
3. Replace

cover screw cap on gas valve.

4. Turn off gas supply to unit. Remove
manometer
from
pressure tap and replace pipe plug on gas valve. Turn on gas
to unit and check for leaks.
Measure

Manifold

The main
unit rated

level specified
Proceed

Pressure

(Propane

Units)

burner orifices on a propane gas unit are sized for the
input when the manifold pressure reading matches the
in Table 3.

as follows

to adjust gas input on a propane

gas unit:

1. Turn off gas to unit.
2. Remove

pipe

plug

(See Fig. 16).

on

manifold

and

connect

manometer

C99021

AIRFLOW

Fig. 17 - Monoport Burner
AND TEMPERATURE
RISE

The heating section for each size unit is designed and approved for
heating operation within the temperature-rise range stamped on the
unit rating plate. Table 4 shows the approved temperature rise
range for each heating input, and the air delivery cfm at various
temperature rises. The heating operation airflow must produce a
temperature rise that falls within the approved range. Refer to
Indoor Airflow and Airflow Adjustments section to adjust heating
airflow when required.
LIMIT SWITCHES
Normally closed limit switch (LS) completes the control circuit
through
the thermostat R circuit. Should the leaving-air
temperature rise above the naaxinmm allowable temperature, the
limit switch opens and the R control circuit "breaks." Any
interruption in the R control circuit instantly closes the gas valve
and stops gas flow to the burners and pilot. The blower motor
continues to run until LS resets.
When the air temperature at the limit switch drops to the
low-temperature setting of the limit switch, the switch closes and
completes the R control circuit. The electric-spark ignition system
cycles and the unit returns to normal heating operation.
AUXILIARY LIMIT SWITCH (ROLLOUT)
The function of the switch is to close the main gas valve in the
event of flame rollout. The switch is located above the main
burners. When the temperature at the auxiliary switch reaches the
maximum allowable temperature, the R control circuit trips,
closing the gas valve and stopping gas flow to the burners. The
indoor (evaporator) fan motor (IFM) and induced draft motor
continue to run until switch is reset. The IGC LED will display
FAULT CODE 7.

3. Turn on gas to unit.

16

Step 4 -- Start-Up
ments

UNIT

DAMAGE

Cooling

1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is
placed in ON position and shuts down when FAN switch is
placed in AUTO. position.

and Make Adjust-

2. Place SYSTEM switch in COOL position and FAN switch
in AUTO. position. Set cooling control below room
temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that cooling cycle
shuts down when control setting is satisfied. The evaporator
fan will continue to run for the time selected on the Easy
Select board.

HAZARD

Failure to follow this warning
damage.

could result in unit component

Complete the required procedures given in the Pro-Start-Up
section before starting the unit. Do not jumper any safety
devices
when operating
the unit. Do not operate
the
compressor
when the outdoor temperature
is below 55°F
(13°C)
(unless accessory low-ambient
kit is installed). Do
not rapid-cycle
the compressor.
To prevent
compressor
damage allow 5 minutes between "on" cycles.

CHECKING
Start and
follows:

check

COOLING
the

unit

for

CONTROL
proper

3. When using an auto-changeover room thermostat, place
both SYSTEM and FAN switches in AUTO positions.
Observe that unit operates in Heating mode when
temperature control is set to "call for heating" (above room
temperature)
and operates in Cooling mode when
temperature control is set to "call for cooling" (below room
temperature).

OPERATION

cooling

control

operation

as

Table

NUMBER OF
ORIFICES

HEATING
INPUT

(BTUH)*

3 - Heating

GAS SUPPLY
Natural
Max
13.0
13.0
13.0
13.0
13.0

Min
4.0
4.0
4.0
4.0
4.0

Inputs

PHI-SSUHI-

(IN. W.C.)
Propanet
Min
4.0
4.0
4.0
4.0
4.0

MANIFOLD
Max
13.0
13.0
13.0
13.0
13.0

PRESSURE

Natural
3.5
3.5
3.5
3.5
3.5

(IN. W.C.)

Propanet
3.5
3.5
3.4
3.7
3.5

2
40,000
2
60,000
3
90,000
3
115,000
3
130,000
* When a unit is converted to propane, different size orifices must be used. See separate, natural-to-propane
conversion kit instructions.
1- Based on altitudes from sea level to 2000 ft above sea level. For altitudes above 2000 ft, reduce input rating 4 percent for each additional 1000 ft (305 m) above
sea level. In Canada, from 2000 ft (610 m) above sea level to 4500 ft (1372 m) above sea level, de-rate the unit 10 percent.

Table

4 - Air Delivery

(CFM)

at Indicated

HEATING
INPUT

Temperature

Rise and Rated

TEMPERATURE

Heating

Input

RISE °F

(BTUH)

20

25

30

35

40

45

50

55

60

65

70

40,000
60,000
90,000
115,000
130,000

1500
2250
----

1200
1800
----

1000
1500
2250
---

857
1285
1929
2464
2786

750
1125
1688
2156
2438

667
1000
1500
1917
2167

600
900
1350
1725
1950

545
818
1227
1568
1773

500
750
1125
1438
1625

-692
1038
1327
1500

--964
1232
--

NOTE: Dashed areas do not fall within the approved

temperature

rise range of the unit.
Table

ERROR

5 - LED

Indications

CODE

LED

Normal Operation
Hardware
Failure
Fan On/Off Delay Modified
Limit Switch Fault
Flame Sense Fault
Four Consecutive
Limit Switch Faults
Ignition Lockout Fault
InducedDraft Motor Fault
Rollout Switch Fault
Internal Control Fault
Safety Critical Code Fault
NOTES:
1. There is a 3-sec. pause between error code displays.
2. If more than one error code exists, all applicable error codes will be displayed
3. This chart is on the wiring diagram located inside the burner access panel.
Table

6 - Filter

in numerical

Pressure

Drop

FILTER SIZE
in. (mm)
20X20X1
(508X508X25)
20X24X1
(508X610x25)
24X30X1
(610X762x25)

INDICATION
On
Off
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes

sequence.
(IN.

W.C.)

CFM
500

600

700

800

900

1000

1100

1200

1300

1400

1500

0.05

0.07

0.08

0.10

0.12

0.13

0.14

0.15

--

--

--

0.09

0.10

0.11

0.13

0.14

0.15

0.16

0.07

0.08

0.09

0.10

....
.......

17

1600

1700

1800

1900

2000

2100

2200

2300

0.11

0.12

0.13

0.14

0.15

0.16

0.17

0.18

Table
CFM ADJUST PIN
SELECT
EXTERNAL STATIC
PRESSURE RANGE

UNIT
SIZE

030

036

Cooling

Dry Coil ECM

042
048
060

Cabinet
HI PIN

0.0-0.39

0.4-0.69

0.7-1.0

0.0-0.39

0.4-0.69

0.7-1.0

0.0-0.39

0.4-0.69

0.7-1.0

800

725

-

885

805

730

990

930

855

715

670

-

715

695

645

795

775

745

1010

920

825

1105

1030

930

1255

1160

1050

890

845

795

890

865

825

1010

980

925

1110

1025

970

1235

1175

1115

1400

1355

1280

990

960

910

990

975

940

1125

1110

1085

Table
EASY SELECT
BOARD SETTING

Small
NOM PIN

Table 8 - 48XP Cooling
CFM ADJUST PIN
SELECT
EXTERNAL STATIC
PRESSURE RANGE (IN. W.C.)
COOLING
COOLING DEHUMIDIFY
COOLING
COOLING DEHUMIDIFY
COOLING
COOLING DEHUMIDIFY

UNIT SIZE

Airflow

LO PIN

(IN. W.C.)
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY
COOLING
COOLING
DEHUMIDIFY

024

7 - 48XP

9 - 48XP

Dry (;oil ECM Airflow

Gas Heating

Large

Cabinet

LO PIN

NOM PIN

HI PIN

0.1-1.0

0.1-1.0

0.1-1.0

1 lO0
98O
1260
1120
1575
1400

1225
98O
1400
1120
1750
1400

1410
1125
1610
1290
2010
1610

ECM Airflow

Small

Cabinet

TM

Unit
Size

024
030
036

700

(CFM)
External
Static
Pressure
(IN, W,C,)
Gas Heat
Size
040
060
040
060
060
090

0.0-0.4

800

0.4-0.7

0.7-1.0

Table
EASY
Unit

SELECT

Size

TM

BOARD
External

042

048

060

10 - 48XP

11 oo

0.0-0.4

0.4-0.7

0.7-1.0

855

770

710

880

840

805

Gas

Heating

SETTING
(CFM)
Static Pressure
(IN. W.C.)
Gas Heat Size
060
090
090
115
130
090
115
130

ECM

Airflow

1250

0.0-0.4

0.4-0.7

0.7-1.0

1020

890

835

1030
1035

970
995

910
955

Large

0.0-0.4

0.4-0.7

0.7-1.0

1170

1110

1025

Cabinet

1000

1250

1600

0.0-1.0

0.0-1.0

0.0-1.0

1000
-

1250
1250
-

1600

-

1250
-

1750

18OO

0.0-1.0

0.0-1.0

1750
1600
1800

Tablell-ECMWetCoilPressureDrop(IN.W.C.)
UNIT
SIZE
024
030
036
042
048
060

STANDARD CFM (SCFM)
600
0.005

700
0.007
0.007
.....
......

800
0.010
0.010
-

900
0.012
0.012
0.019
-

1000
0.015
0.015
0.023
0.014

1100
........
0.018
0.027
0.017

1200

1300

1400

1500

1600

1700

1800

1900

2000

2100

0.021
0.032
0.020
0.027

0.024
0.037
0.024
0.032

0.042
0.027
0.036

......
0.047
0.031
0.041
0.029

.....
0.035
0.046
0.032

0.039
0.052
0.036

0.043
0.057
0.040

0.063
0.045

0.068
0.049

0.053

18

BLN

SCII_MAT IC

YEL

F_ELD

208/230-_-60

_YEL

SUPPLY

___Y__

_

_

_

OFM
//

LEGEND
_FIELD
SPLICE
O TERM_NAL_MAREED}
o TERMINAL (UNMARNEDI
@ SPLICE
O SPL_CE {MARKED}
FACTORYWIRING
F_ELN CONTROLW_RINO
E_ELD POMERWIRING
ACCESSORY
OR OPTIONAL
W_RING
TO _NR_CATECOMMON
POTENTIAL ONLY:
NOT TO REPRESENTMIRING
BR
B
CAP
COMB
CR

OLOMENREtAY
CONTACTOR
CAPACITOR
COMPRESSOR
MOTOR
COMBNSTION
RELAY

E_NIP
EQUIPMENT
POWER
F
ELANE
SENSOR
FU
FUSE
MEN
GROUND
GVR
GAS VALVE RELAY
NPS
NIGH PRESSURESM_TC_
US
HALL EFFECT SENSOR
HV TRANHIGH VOLTAGETRANSFORMER
I
IBNITON
IBM
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MOTOR
_DM
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IFM
INDOORFAN MOTOR
[MD
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GAS UNIT
CONTROLLER
kPS
LOW PRESSURE
SM_TDH
LS
L_M]T SWlTC_
MGV
MAIN GAS VALVE
OFM
OUTDOORFAN _OTOR
QT
QUADRUPLETERMINAL
ENERG ZED
RS
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/
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YEI

COMP

@

IFM
YEL

DE-ENERG ZED

_DM
TRAN[

24V
SECONDARY

REg_
IGC
..................................
BLK

@

24V SPLICE BOX
IBM BOARD

RED

ORN

Jz

BB

GRA

BLK@>-5

REDI

PLR-2

AMP

_

_

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CED

/

/,_

,
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;R

SEE NOTE IO

C_
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_

WHT

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GRN_>

I

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C3[7

ON
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_

PL28

BRN/_
BRN

I

BRN

PLI

I

GRN
YEL

I
COMMON

WIlT
BLN_
RED
8RN
PNN
ORN
UNIT

COMPONENT

ARRANGEMENT

GRA

OUTDOOR FAN
SECT ON

ORN
EQUIP
GND k
I

B[U
v_o

SECTION

:APE

vlo

BIN

BLK

WET

WHT

_
_DISCONNECT
PER NEC

COMP

MOUNTING PANEL ABOVE
INDOOR BLOWER
C

s

R
GAS SECTION

_
NORNALOPERATIO_
_
_AR_MARE
FAIlUrE
OF_
FA_ O_/OFF DELAYMODIFIED
I _LAS_
L_M_T S_TC_ _A_tT
R RLAS_ES
FLAMESENSERAULT
3 _tASNES
S CONSECUTIVEtlMIT SWlTC_ _AUtTS
4 _t_S_ES
EGN_EON LOCEOUT_AU_T
S ELAS_ES
_NDUCERSWlTD_ _AULT
6 _tAS_ES
ROLLOUTSMITD_ FAULT
7 ELAS_ES
EN_ERNALCONTROLEAN[T
8 ELASNES
TEMPORARY
ONE _OU_AUTOMATIC_ESET EANLT_NOTE9} 9 ELASNES
B SECOND_A_SE BETWEENERRORCODE_ISRtAY
2 _F MORET_AN ONE ERROREXISTS, ALL APPLICABLEERRORCODES
S_ALL BE DISRtAYED IN NUMERICAtSEQUENCE

NOTES:
i1[ ANYo_ T1_£ORIGINAL WIRESFURNISDED
ARE REPLACED,
IT MUSTBE REPLACEDWITR TYPE 9O _EMREED MIREOR
ITS EQUIVALENT
2 SEE _RICE _AGES _OR TI_[RNOSTAT
ANDSUEBASES
SUSE ;5 DEGREECOPPERCORRUPTORS
FOR F_ELR E_STALLAfEON
4 REPLACELOWVOLTAGEFUSES M_TRNOGREATERTHAN5 A_P FUSES¸
S ON MODE_S4BGPR24 0_ HASLS] _ND LSE _N SER_ES
ON_ODELS 48GPO4R060 _AS LSE O_LY
6_E_OVE J_ MHENUSING THER_R_STAT/ HU_R_STAT ANR
DEHR_O_F_CAT_ON_ORE
_RE_OVE J_
B TO 8E W_RER_ ACCORRA_CE
MET_ NEC A_DLOCALCODES¸
_T_S
CODE_D_CA_ES A_ [_1ER_AL PROCESSOREA_LT T_ATWILL
RESET _TSELF _N ONE_OUR FAUtT CAN 6E CENSERBY STRAY_E
S_GNELS _ THE STRUCTURE
OR _EARBY TIHS IS A Ut REQUIREMENT
EAUtT
[OT_[S

FUSE [S MANUFACTURED
B_ LITTEtEUSE, R/N RS_OOS

A08462

Fig. 18 - 208/230-1-60

Wiring

19

Diagram,

Unit 48XP

SCHEMATIC
208/230-3-60
FIELD
BLK

SUPPLY

YEL

fEL

O\Ti__

__

__]_2_
EQU

POWER

,[/

8LU

tP_GND

C

OFM

BLN

BLH

OR

+iL

LEGEND
_P_ELD
Q

SPLICE

TERNINAL

{MAR_ED)

TERMINAL
SPLICE

(UNMARKED)

C],SPLICE

(MARKED)

--FACTORY
-- -- FIELD

WIRING
CONTROL WIRENG

R

CONPRESSOR

CR

COMBUSTION

COOLING

BLK
YEL

E
EC_
IDW

PL4+4

ENROOR FAN MOTOR
INTEGRATED
GAS UNIT
CONTROLLER
LOW PRESSURE
SWETCH
L{N{T
SWITCH
MAiN GAS VALVE

RELAY

_R_AN

OUTDOOR
FAN MOTOR
QUADRUPLE
TERMINAL
ROLLORT
SWITCH
IRANSFORmE R

PRIMARY

LOGIC
YE

T130

TRANI

_

W BR
ENERGIZED

LOGIC

--RED
IGC

CR

BOX

-RED
BR

--ORN--

JR

I_

PLB'B
5

--_L__2_

)>-RED
PL?-3

-vv_

OFF

L--

_

//

/ /

T

BRA_

I

NOTE I0

_._EE

-SEE NOTE_5

RE]

AMP

SEE NOTE lOJ

+RN--

-f+2+-

PL2-1

OFF
.E_T

meT-GNU" YE L_

{_

-WHT
[------

oT

+-

-BLH
SPLICE

I

II

R4V
SECONDARY

W
BR
DE-ENERGIZED

24V

I DM

YEL

DE-ENERGIZED

PAN

_FN

--GRN-YEL_
tFM
IGC

OFM
OT

_

HEATING

ONLY

EGNITOR
ENTEGRATED
CONTROL
_OTOR
iNDUCER DRAFT MOTOR

LPS
LS
NOV

FAN

UNITS

+

++

SENSOR

GAS VALVE
RELAY
HiGH PRESSURE
SWITCH
HALL EFFECT SENSOR
H{GH VOLTAGE TRANSFORMER

MOTOR

&
G
ENERGIZED

FLAME
FUSE
GROUND

BLOWER RELAY
CONFACTOR
CAPACITOR

COMP

FS

GVR
HPS
HS
HV TRAN

INDICATE
COMMON
POTENTIAL
ONLY:
NOT TO REPRESENT
WIRING

CAP

EQUIPMENT

FU
GND

--FIELD POWER WIRING
---- ACCESSORY
OR OPTIONAL
WIRING
--TO

EQUIP

042-060

MGV

_--WHT

_HEAT

-----SRA _

YEL

OAUTO

PLZ-R
FLAME

_COOL

TCI

Y_

_--YEL

--Y
123

C_I>--

o_

BR_
H_

--BRN

TOTRANS

_--BRN

TO CONT

;ROUNDED
IHRU STANDOFF

C_13---

.J

-_o
_RN-YEL

GRN---)>--

I
I

AUTO

0--

PL?-T

....

SEN

E L---o [

SECT

ON

--

_--BRN

I
I

--

FIELD-THERMOSTAT

_7_B

PLI

L KHPs_BL

H---_BL

U_)_BL

U--

BRR --

_

BRN --

COMMON
....

UNIT

SECTION
OUTDOOR

EAR

COMPONENT

ARRANGEMENT

E_->_

[]
EQU
GND

SECTION
..... E....

, SECTION
_ND_OOR
FAN

>_GC

BRR--

I CONTROL
EII_

-GRA

ORN

-ORN

BLU

-BLU

v_o

-VIO

BOX
-BLN

[_

-WHT

Wilt

NOTES:I_F
_

E

MOUNTING
_NDOOR

c s
R
GAS

ss£
SECTION

PANEL
BLOWER

ABOVE

ANy OF
iT _UST

THE ORIGINAL

BE REPLACED

WIRES FURNISHED

ARE REPLACRD,

W_TR TYPE gO DEGREE

C _IRE

OR

RARD_ARE FAILURE
FAN ONIOFF DELAY NOD{PiED
NORMAL SWITCH
OPERA_IO_
LIMIT
FAULT
PLANE SENSE FAULT

OFF
_ FLASH
Z FLASHES
3 FLASHES

Z SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES
3USE
75 DEGREE COPPER CONDUCTORS
FOR F_ELD _NSTALLAT_ON
ITS EQUIVALENT
4REPLACE
LOW VOLTAGE FUSES W_TH NO GREATER THAN S A_P FUSES
SON
_ODZLS 4RXPOZ_+O)6 HAS ISI AND LS2 _N SERIES

_GNIT_ON
5
CONSECUTIVE
LOCKOUT
LI_[T
FAULT
SWITCH FAULTS
{NRVCER SW_TCN FAULT
ROLLOUI SWITCH FAULT
iNTERNAL CONTROL FAULT
TEMPORARY ONE HOUR AUTO_IATIC RESET _AULT (NOTE 9}
[
3 SECOND PAUSE BETWEEN ERROR CODE D_SPLAY

_
6
T
B
9

ON MODELS _8XPO_2"060 HAS LS[ ONLY
6REMOVE
J[ WHEN USING TRER_IDISTA_I
HU_IDISFAI AND
DEHUmIDIFICATiON
MODE
?REMOVE
J2
8TO
BE WIRER IN ACCORDANCE
_ITH NEC AND LOCAL CODES
9THIS
CODE INDICATES AN [NTERNAL PROCESSOR FAULT THAT W[LL

Z

If _ORE THAN ONE ERROR EXISTS+ ALL APPLICABLE
SHALL RE DISPLAYED
{N NUMERICAL SEQUENCE

FLASHES
FLASHES
FLASHES
FLASHES
FLASHES

ERROR CODES

RESET [TSELP I_ ONE HOUR
FAULT CAN BE CAUSED BY STRAY RP
SIGNALS IN THE STRUCTURE OR NEARBY
THIS IS k UL REQUIREMEN_

FAULT

!48XP500149 16,0
A08463

Fig. 19 - 208/230-3-60

Wiring

20

Diagram,

[]nit 48XP

Required

Subcoolin_

Outdoor
Model

oF IoC)

Ambient

Required

Temperature

Required

Liquid Line Temperature

Subcooling

for a Specific

Subcooting

(°F)

(R-41OA)

Required

Subcooling

(°C)

Size
75 (24)

024

82 (26)

10.3(5.7)

86 (29)

9.8(5.4)

96 (85)

9.4(6.2)

105 (41)

9(5)

Pre_sur,
5

10

15

20

26

Pre_sur_
(kPa)

3

6

8

11

14

189

61

56

51

46

41

1303

16

13

11

8

5

7(3.9)

196

63

58

53

48

43

1351

17

18

12

9

6

16
17

13
14

10
11

8
9

8.6(4.7)

030

9.3 ( 5.2 )

8.8 ( 4.9 )

8.6 ( 4.8 )

036
042

17.6(9.8)
12.8(7.1)

16.8 (9.3)
12.7(7.1)

16.6 (9.2)
12.7(7.1)

16.4 (6.6)
12.6(7)

14.3(7.9)
12.6(7)

203
210

66
68

61
63

66
68

51
53

46
48

1399
1448

19
20

17.5(9.7)

16.9(9.4)

16.6(9.2)

16.7

(6.7)

14.8(8.2)

217

70

66

60

55

50

1496

21

18

15

13

10

13.7(7.6)

13(7.2)

16(7.2)

14.6

(6.1)

11.5(6.4)

224

72

67

62

57

52

1544

22

19

16

14

11

231

74

69

64

59

54

1593

23

20

18

15

12

238

76

71

66

61

56

1641

24

21

19

16

13

245

77

72

67

62

57

1689

26

22

20

17

14

252

79

74

69

64

59

1737

26

23

21

18

15

260

81

76

71

66

61

1792

27

25

22

19

16

268

83

76

73

68

63

1848

29

26

23

20

17

276

85

80

78

70

66

1903

30

27

24

21

19

284

87

82

77

72

67

1956

31

28

25

22

20

292
300

89
91

84
86

79
61

74
76

69
71

2013
2066

32
33

29
30

26
27

23
24

21
22

309

93

88

63

78

73

2130

34

31

28

26

23

316

95

90

65

80

76

2192

36

32

29

27

24

327
336

97

92

67

82

77

2254

36

33

31

28

25

99

94

69

84

79

2316

37

34

32

29

26

345
364

101

96

91

86

81

2376

38

35

33

30

27

103

98

93

88

83

2440

39

36

34

31

28

364

105

100

95

90

86

2509

40

38

35

32

29

374

107

102

97

92

87

2576

41

39

36

33

30

384

108

103

98

96

88

2647

42

40

37

34

31

394

110

106

100

95

90

2716

44

41

38

35

32

4O4

112

107

102

97

92

2786

45

42

39

36

33

414

114

109

104

99

94

2854

46

43

40

37

34

424

116

111

106

101

96

2923

47

44

41

38

35

434

118

113

108

103

98

2992

46

45

42

39

36

444

119

114

109

104

99

3061

46

46

43

40

37

454

121

116

111

106

101

3130

49

47

44

41

38

464

123

118

113

108

103

3199

50

48

45

42

39

474

124

119

114

109

104

3266

51

48

46

43

40

464
494

126
127

121
122

116
117

111
112

106
107

3337
3406

52
53

49
50

47
47

44
45

41
42

5O4

129

124

119

114

109

3476

54

51

48

46

43

514

131

126

121

116

111

3544

55

52

49

46

44

524

132

127

122

117

112

3612

56

63

50

47

45

534

134

129

124

119

114

3661

56

64

51

48

45

046
060

Charqinq

1- Meacure

Procedure

Di¢charge

line preceure

2- Meacure the Liquid
device to it.

by attaching

line temperature

3- Ineulate the temperature
doe_=n'_affect
the reading.

ceneing

value€.

if the Outdoor

Extrapolate

in the

ambient

8- Add Charge

Ambient

lie_ in between
the

to obtain

temperature

Outdoor

port.

Ceneing

on the model

¢ize and

the table

table range.

in the table corre¢ponding
Di¢charge
line.

if the meaeured

50XZ500174

table baeed

lie€ beyond

7- Read acro¢_= from the Preeeure reading
temperature
for a required Subcooling

to the _ervice

a temperature

_=o that the

temperature

if the temperature

6- Find the Pree_ure Value
Pre¢¢ure of the Compre¢eor

a gauge

by attaching

device

4- Refer to the required
Subcooling
the Outdoor
Ambient temperature.
5- Interpolate

7.6 ( 4.3 )

to the the

the Liquid

i¢ higher than the

meaCured

line

table value.

]

C03027

IMPORTANT:

Three-phase,

direction-oriented.
compressor
5 minutes,
3-phase

suction

scroll

units must be checked

to ensure

proper

3-phase power lead orientation.
If not corrected within
the internal
protector
shuts off the compressor.
The
power

rotation.
elevated

These

Fig. 20 - Cooling Charging
Table-Subcooling
compressor
units
are
To Use Cooling Charging

leads

When
noise

The refrigerant

unit

and

the

pressures

be
scroll

difference

reversed

to correct

compressors
between

emit

compressor

REFRIGERANT

is fully charged

with

CHARGE

R-410A

refrigerant,

tested, and factory-sealed.
NOTE:

Adjustment

the unit is suspected
An

accurate

of the refrigerant
of not having

superheat,

charge

the proper

thermocouple-

is not required
R-410A
or

unless

charge.

thermistor-type

thermometer,
and a gauge manifold
are required when using the
subcooling
charging method for evaluating the unit charge. Do not
use mercury or small dial-type thermometers
adequate for this type of measurement.

UNIT

DAMAGE

the liquid

line temperature

and read the manifold

gauges. Refer to the chart (See Fig. 20) to determine
liquid line temperature
should be.
NOTE:

If the

refrigerant

leak, refer to the Check

problem

causing

INDOOR

AIRFLOW

the

inaccurate

for Refrigerant

AND AIRFLOW

pressure
what

readings

the
is a

Leaks section.

ADJUSTMENTS

may be zero.

AND ADJUSTING
system

must

backwards,

levels,

and discharge

CHECKING

to the

turning

Take

Charts

because

they are not

For cooling operation, the recommended
airflow is 350 to 450 cfm
for each 12,000
Btuh of rated cooling
capacity.
For heating
operation,
the airflow must produce a temperature
rise that falls
within the range stamped on the unit rating plate. Table 4 shows
the temperature
rise at various airflow rates. Table 7 & 8 show
cooling

airflows

at the

selection
to these
installed.

pin ranges (depending
on external static pressure).
tables to determine
the airflow
for the system

Refer
being

NOTE:

and Table

Be sure that all supply-

free from obstructions,

HAZARD

Failure to follow this caution may result in unit damage.
When evaluating the refrigerant charge, an indicated
adjustment to the specified factory charge must always be very
minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.

airflows

9 & 10 show

and return-air

and adjusted

ELECTRICAL

SHOCK

Failure to follow
or death.

this warning

heating

grilles

are open,

properly.

HAZARD
could result in personal

iniury

Before making any indoor wiring adjustments,
shut off gas
supply. Then disconnect electrical power to the unit.
Airflow can be changed
Select circuit board.

21

by changing

the selection

pins on the Easy

AIR FILTER

MAINTENANCE
To ensure continuing high performance and to minimize the
possibility of premature equipment failure, periodic maintenance
must be performed on this equipment.
This combination
heating/cooling unit should be inspected at least once each year by
a qualified service person. To troubleshoot cooling or heating of
units, refer to Tables 12, 13 and 14.
NOTE:
Consult your local dealer about the availability of a
maintenance contract.

NOTE: Never operate the unit without a suitable air filter in the
return-air duct system. Always replace the filter with the same
dimensional size and type as originally installed. (See Table 1 for
recommended filter sizes.)
Inspect air filter(s) at least once each month and replace
(throwaway-type) or clean (cleanable-type) at least twice during
each heating and cooling season or whenever the filter(s) becomes
clogged with dust and/or lint.
EVAPORATOR
BLOWER
AND MOTOR
NOTE: All motors are prelubricated. Do not attempt to lubricate
these motors.

PERSONAL
Failure

INJURY

AND UNIT

to follow this warning

or death and unit component

DAMAGE

HAZARD

could result in personal

injury

damage.

The ability to properly
perform
maintenance
on this
equipment requires certain expertise, mechanical
skills, tools
and equipment.
If you do not possess these, do not attempt to
perform any maintenance
on this equipment,
other than those
procedures recommended
in the Owner's Manual.

ELECTRICALSHOCK

For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the blower wheel and
motor annually.
CLEANING THE BLOWER MOTOR AND WHEEL
1. Remove and disassemble blower assembly as follows:
a. Remove unit access panel.
b. Disconnect motor lead from blower relay (BR).
Disconnect yellow lead from terminal L2 of the
contactor.
c. On all units, remove blower assembly from unit.
Remove screws securing blower to blower partition and
slide assembly out. Be careful not to tear insulation in
blower compartment.
d. Ensure proper reassembly by marking blower wheel and
motor in relation to blower housing before disassembly.
e. Loosen setscrew(s) that secures wheel to motor shaft.
Remove screws that secure motor mount brackets to
housing, and slide motor and motor mount out of
housing.
2. Remove and clean blower wheel as follows:

HAZARD

Failure to follow these warnings could result in personal
iniury or death:
1. Turn off electrical power to the unit before performing
any maintenance or service on this unit.
2. Use extreme caution when removing panels and parts.
3. Never place anything combustible either on or in contact
with the unit.

a. Ensure proper reassembly by marking wheel orientation.
b. Lift wheel from housing. When handling and/or
cleaning blower wheel, be sure not to disturb balance
weights (clips) on blower wheel vanes.
c. Remove caked-on dirt from wheel and housing with a
brush. Remove lint and/or dirt accumulations from
wheel and housing with vacuum cleaner, using soft
brush attachment. Remove grease and oil with mild
solvent.

4. Should overheating occur or the gas supply fail to shut
off, turn off external main manual gas valve to the unit.
Then shut off electrical supply.

UNIT OPERATION
Failure to follow
operation.

HAZARD
this caution

may result in improper

d. Reassemble wheel into housing.
e. Reassemble motor into housing. Be sure setscrews are
tightened on motor shaft flats and not on round part of
shaft.

Errors made when reconnecting wires may cause improper
and dangerous
operation. Label all wires prior to
disconnecting when servicing.
The minimum maintenance requirements for this equipment are as
follows:
1. Inspect air filter(s) each month. Clean or replace when
necessary. Certain geographical locations may require more
frequent inspections.
2. Inspect indoor coil, outdoor coil, drain pan, and condensate
drain each cooling season for cleanliness. Clean when
necessary.

f. Reinstall unit access panel.
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during heating and
cooling cycles.
FLUE GAS PASSAGEWAYS
To inspect
exchanger:

1. Remove
according
section.

3. Inspect blower motor and wheel for cleanliness at the
beginning of each heating and cooling season. Clean when
necessary. For first heating and cooling season, inspect
blower wheel bi-monthly to determine proper cleaning
frequency.

2. Remove
collector
3. Remove

flue

collector

box

the combustion
to

directions

6. Check flue hood and remove any obstructions, if necessary.
22

in

wheel

the

areas

of the heat

and motor

Combustion-Air

the blower

housing

assembly
Blower
to the flue

box cover (See Fig. 23).
the 12 screws holding

4. Clean all surfaces,

each heating

and upper

blower

the 3 screws holding

(See Fig. 24) to the heat
heat exchangers.

4. Check electrical connections for tightness and controls for
proper operation each heating and cooling season. Service
when necessary.
5. Check and inspect heating section before
season. Clean and adjust when necessary.

the

the flue collector

exchanger

as required,

assembly.

using a wire brush.

box cover
Inspect

the

COMBUSTION-AIR

BLOWER

Clean periodically
to assure proper airfow and heating efficiency.
Inspect blower wheel every fall and periodically
during the heating
season.
For the first heating
season,
inspect
blower
wheel
bimonthly
to determine
proper cleaning
frequency.
To inspect
blower wheel, remove draft hood assembly. Shine a flashlight into
opening to inspect wheel.
and wheel as follows:
1. Remove

is required,

remove

motor

unit access panel (See Fig. 22).

2. Remove

the

mounting
3. Slide

If cleaning

7 screws

that

plate to blower

the

motor

attach

housing

and blower

induced-draft

motor

(See Fig. 23).

wheel

assembly

out

of the

blower housing (See Fig. 23). Clean the blower wheel. If
additional cleaning is required, continue with Steps 4 and 5.
4. To remove

blower,

remove

2 setscrews

5. To remove
motor and cooling
screws that hold blower housing
6. To reinstall,

fan assembly,
remove
to mounting plate.

reverse the procedure

LIMIT

SWITCH

Remove

unit access

panel.

Limit

(See Fig. 23).

switch

outlined

4

Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent-and-water
solution.
Rinse coils with clear water, using a garden hose. Be careful not to
splash water on motors, insulation, wiring, or air filter(s). For best
results, spray condenser coil fins from inside to outside the unit. On
units with an outer and inner condenser coil, be sure to clean
between the coils. Be sure to flush all dirt and debris from the unit
base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing all
foreign matter from the pan. Flush the pan and drain tube with
clear water. Do not splash water on the insulation, motor, wiring, or
air filter(s). If the drain tube is restricted, clear it with a "plumbers
snake" or similar probe device. Ensure that the auxiliary drain port
above the drain tube is also clear.
INDUCED

above.

is located

DRAFT

MOTOR

MOUNT

<
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