Ducane AC10B24 User guide

FEATURES

Durable Copeland ®compressors, with internal pressure relief
valves and inherent thermal protection

High quality Ducane made condenser coil with copper tubing and
enhanced louvered fin for maximum heat transfer capability

Permanently lubricated condenser fan motor

Top discharge directs hot air and sound away from
living area and shrubbery

All units run tested

Heavy gauge, textured, pre-painted cabinet provides
corrosion and abrasion protection

Easy access to electrical panels, pre-wired for easy hook-up

Hinged control panel allows simple access to
internal components

Service valve gauge ports positioned to allow
plenty of access room

Warranties: 5 year parts; 5 year compressor

(see warranty certificate for details)

Liquid line filter drier installed in every unit

All units ETL, ETLC approved and ARI listed

Charged for 15 feet of interconnecting tubing

Crankcase heaters standard on all 3-phase models with
reciprocating compressors

AC10B

Ducane Air Conditioner

UNIT DIMENSIONS

MODEL SQUARE BASE HEIGHT
NUMBER (INCHES) (INCHES)

AC10B18 22 1/2 x 22 1/2 23 1/2
AC10B24 22 1/2 x 22 1/2 23 1/2
AC10B30-A 22 1/2 x 22 1/2 23 1/2
AC10B36-B, 36TA, 36F 22 1/2 x 22 1/2 27 1/2
AC10B42-A 22 1/2 x 22 1/2 31 1/2
AC10B48-A, 48TA, 48FA 22 1/2 x 22 1/2 31 1/2
AC10B60-A, 60T, 60F 30 x 30 27 1/2

T = 208/230V 3 Phase; F = 460V 3 Phase.

OUTDOOR INDOOR AIRFLOW NET CAPACITY SEER
UNIT SECTION (SCFM) (BTUH/HR) (BTUH/WATT)

AC10B18 ACC18AA 600 18,200 10.20
AC10B24 ACC24AA 800 23,400 10.00
AC10B30-A ACC30AA 1000 29,200 10.20
AC10B36-B, 36TA ACC36BA 1200 34,600 10.00
AC10B42-A ACC42BA 1400 40,000 10.00
AC10 B48-A, 48TA, 48FA ACC48CA 1500 45,500 10.00
AC10B60-A ACC61CA 1800 58,500 10.00
AC10B60T, 60F ACC61CA + TDR 1800 59,000 10.00

Certified in accordance with the ARI Standard 210/240 certification program, which is based on ARI Standard 210/240.

THE DIFFERENCE IS QUALITY

®

www.ducanehvac.com

R

ELECTRICAL DATA

Rated Voltage (Volts) 208-230 460 208-230 460 208-230 460
Phase 1 3 1 3 1 3
Frequency (Hz) 60

Rated Load Amps 9.6 10.9 13.6 16.1 10.0 5. 1 19.0 20.4 14.0 6. 4 30.7 17.2 8.2

Locked Rotor Amps 49 56 76 82 70 33 105 102 91 42 135 124 60

Full Load Amps 0.8 1.4 0.8 1.1 0.8 2.0 0.8
Locked Rotor Amps 1.4 3.0 1.9 3.0 1.9 4.3 1.9
Max. Fuse Size* 20 25 25 30 20 15 40 45 30 15 60 40 15

Min. Circuit Ampacity** 12.8 14.4 16.6 19.8 13.5 7.2 25.0 26.7 18.6 8.8 38.9 22.9 11.1

AC10B

Ducane Air Conditioner

20590101 04/02 20K Replaces 20399201

Printed on recycled paper.

For more information, contact your local Ducane distributor.

Shading means not available or factory installed.

UNIT SPECIFICATIONS

THE DIFFERENCE IS QUALITY

®

ACCESSORIES

* Time delay fuse/HACR Breaker
**Refer to national Electrical Code (or Canadian Electrical Code) to determine wire size, fuse and disconnect size requirements
***Field supplied 7/8” to 1-1/8” adapter required. Use of 7/8” vapor line reduces performance approximately 3 - 4%.

DUE TO OUR POLICY OF CONTINOUS IMPROVEMENT, SPECIFICATIONS ARE

SUBJECT TO CHANGE WITHOUT NOTICE.

AC10B AC10B AC10B AC10B AC10B AC10B AC10B AC10B AC10B AC10B AC10B

Model Number 18 24 30-A 36-B, 36TA 36FA 42A 48-A, 48TA 48FA 60-A 60T 60F

PHYSICAL DATA

Face Area (ft2) 8.19 9.83 11.51 14.83
Tube / Fin Material (CU/AI)

Smooth Grooved Grooved Smooth
Tube Diameter (in.) 3/8
No. of rows 1
Fins per inch 14 20 18 20 18 22
Diameter (in.) 18 22
No. of blades 3
RPM 1100
Motor HP 1/10 1/5 1/4 1/5 1/4

Liquid Line Connection (in.) 3/8
Vapor Line Size Required (in.) 5/8 3/4 7/8 1-1/8***
Vapor Line Connection (in.) 5/8 3/4 7/8
Shipping Weight 124 131 138 146 153 194

CONDENSER

COIL

CONDENSER

FAN

UNIT

COMPRESSOR

FAN

MOTOR

UNIT

Unit Size 18 24 30-A 36-B 36TA, 36FA 42A 48-A,48TA 48FA 60-A 60T, 60F

High Pressure Switch

20442501

(all models)

Low Pressure Switch

20442502

(all models)

Short Cycle Protection

20442601

(all models)

Hard Start Kit

20442701 20442702 20442708 20442704 20442705 20442705

Crankcase Heater

20442801 20442801 20442802

Sound Blanket

20442901 20442905 20442902

Low Ambient Kit

20442504

SPLIT SYSTEM AIR CONDITIONER AND HEAT PUMP

INSTALLATION / START-UP INFORMATION

These instructions must be read and understood completely before attempting installation.

These units are designed for use in residential and commercial type buildings with a wide
variety of Furnace/Air Handlers and Evaporator Coil combinations. Air-conditioners can be used
with conventional forced warm air heating systems and/or straight cooling systems independent
of the heating. Heat pumps are sensitive to indoor units and may only be installed with
combinations listed in the Air-Conditioning and Refrigeration Institute (ARI) Directory of Certified
Products.

After uncrating unit, inspect thoroughly for hidden damage. If damage is found, notify the
transportation company immediately and file a concealed damage claim.

ISSUE 0144

WARNING

Installation or repairs made by unqualified
persons can result in hazards to you and
others. Installation MUST conform with local
building codes or, in the absence of local
codes, with the National

Electrical Code
NFPA 70/ANSI C1-1993 or current edition
and Canadian

Electrical Code Part 1 CSA

C22.1.

The information contained in this manual is
intended for use by a qualified service
technician familiar with safety procedures
and equipped with the proper tools and test
equipment.

Failure to carefully read and follow all
instructions in this manual can result in
equipment malfunction, property damage,
personal injury and/or death.

CAUTION

Improper installation, adjustment, alteration,
service or maintenance can void the
warranty.

NOTE: These instructions are intended as a general

guide and do not supersede national, state
or local codes in any way.

Table

Of Contents:

Safety Precautions . . . . . . . . . . . . . . . . . . . . . . 2

Unit Location . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Roof Top Installations . . . . . . . . . . . . . . . . . . . 2

Evaporator Piston Selection . . . . . . . . . . . . . . . 2

Refrigeration Line Sets . . . . . . . . . . . . . . . . . . . 2

Installation Of Line Sets . . . . . . . . . . . . . . . . . . 3

Service Valve Type . . . . . . . . . . . . . . . . . . . . . 3

Brazing Connections . . . . . . . . . . . . . . . . . . . . 3

Leak Check . . . . . . . . . . . . . . . . . . . . . . . . . 3

Evacuating & Charging Instructions . . . . . . . . . . 3

Opening Service Valve . . . . . . . . . . . . . . . . . . . 4

Electrical Connections . . . . . . . . . . . . . . . . . . . 4

Control Wiring . . . . . . . . . . . . . . . . . . . . . . . . . 4

Pre-Start Procedure . . . . . . . . . . . . . . . . . . . . . 5

Start-up Procedure . . . . . . . . . . . . . . . . . . . . . . 5

Adjusting Charge . . . . . . . . . . . . . . . . . . . . . . . 5

Piston System Charging . . . . . . . . . . . . . . . . . . 5

TXV System Charging . . . . . . . . . . . . . . . . . . . 5

Defrost System . . . . . . . . . . . . . . . . . . . . . . . . 6

Unit Maintenance . . . . . . . . . . . . . . . . . . . . . . . 6

Home Owner's Information . . . . . . . . . . . . . 7 & 8

20407502 ISSUE 0144 Page 1 of 8

Safety Precautions

1. Always wear safety eye wear, work gloves and
protective clothing when installing equipment.

2. Never assume electrical power is disconnected. Use a
meter to verify power is disconnected.

3. Keep hands out of fan areas when power is connected
to equipment.

4. Have a fire extinguisher available.

5. R-22 causes frost-bite burns.

6. R-22 is toxic when burned.

7. The weight of the unit requires caution and proper
handling procedures when lifting or moving to avoid
personal injury. Use care to avoid contact with sharp
or pointed edges.

NOTE TO INSTALLING DEALER:
These instructions and warranty are to be given to
the owner or prominently displayed near the indoor
furnace/air handler unit.

Unit

Location

The remote condensing unit is to be installed on a solid
foundation. This foundation should extend a minimum of
2" (inches) beyond the sides of the condensing unit and
must be level. To reduce the possibility of noise
transmission, the foundation slab should NOT be in contact
with or be an integral part of the building foundation.

The "top discharge" condenser air is taken in through the
condenser coil and is discharged out the top. For quiet
operation and maximum efficiency, eliminate any
obstructions which might interfere with air discharge.

DO NOT LOCATE THE UNIT:

• on brick, concrete blocks or unstable surfaces.

• near clothes dryer exhaust vents.

• near sleeping area or near windows.

• under eaves where water, snow or ice can fall directly
on the unit.

Top Installations

Roof

If necessary to install units on a roof structure, be sure
to elevate and level the units. The unit must be installed
at least 6" (inches) above the roof surface. Ensure the
roof structure and anchoring method is adequate for unit
location. Isolate unit and tubing from building structure.
Consult local codes regarding rooftop mounting.

Evaporator

Piston Selection

The condensing unit must be matched to an approved
evaporator. Refer to the unit specification sheet furnished
with the unit or unit rating plate for proper size piston. If
the evaporator coil does not have a piston already installed
or if the piston installed is not the one indicated, a
replacement piston is required. The correct number piston
is included with unit or may be purchased from a
wholesale distributor. See the evaporator coil (indoor unit)
instructions for details of changing the piston.

The evaporator coil may also use a thermal expansion
valve (TXV) in place of a piston.

NOTE: The proper piston or thermostatic expansion

valve MUST be installed in the indoor coil
prior to installation of refrigerant lines.

Zoning ordinances may govern the minimum distance the
condensing unit can be installed from the property line.
Check before proceeding.

Refrigeration

Fully annealed refrigeration lines should be used when

installing the system. DO NOT use copper water pipe.

Line Sets

Refer to unit specification sheet for proper line set sizes.

Locate the outdoor unit as close to the indoor unit as
possible to avoid any long refrigeration line runs. Allow a
minimum of 36" (inches) on the service panel side of the
unit for service. Ensure there is a minimum of 24" (inches)
clearance on two of the sides and 12" (inches) on the
other side. A minimum vertical clearance of 60" (inches)
is required to overhang. Allow at least 24" (inches)
between multiple units.

DO LOCATE THE UNIT:

• with proper clearances on sides and top of unit.

• on a solid, level foundation or pad

• to minimize refrigerant line lengths.

• to allow for drainage of defrost water and prevent ice
build-up (heat pump only)

• above expected snowfall levels (heat pump only).

20407502 ISSUE 0144 Page 2 of 8

Table 1 lists line set sizes if specification sheet is not

available. Split systems may be installed with up to 50 feet
of line set (no more than 20 feet vertical) without special
consideration. For other lengths, contact your distributor
technical service.

Table 1 Line set sizes

Unit Size Liquid Line Vapor Line

18 3/8" * 5/8"

24 3/8" * 5/8"

30 3/8" 3/4"

36 3/8" 3/4"

42 3/8" 7/8"

48 3/8" 7/8"

60 3/8" 1-1/8" **

* Up to 25 feet of 1/4" line is permissible
** 7/8" permissible, resulting in 3-4% capacity reduction

It is important that no tubing be cut or seals broken until
you are ready to actually make connections to the
evaporator and to the condenser section. DO NOT
remove rubber plugs or copper caps from the tube ends
until ready to make connections at evaporator and
condenser. Under no circumstances leave the lines open
to the atmosphere for any period of time.

Be extra careful with sharp bends. Tubing can "kink"
very easily, and if this occurs, the entire tube length will
have to be replaced. Extra care at this time will eliminate
future service problems.

It is recommended that vertical suction risers not be up­sized. Proper oil return to the compressor should be
maintained with suction gas velocity. Contact your
distributor technical service for line sets longer than 50 feet
or with more than 20 feet vertically between the indoor and
outdoor unit.

On applications where liquid floodback to the compressor
may occur, a suction line accumulator is recommended.
Please note accumulators are factory installed in heat
pumps, if required. Contact your distributor technical
service for further information.

Installation

DO NOT fasten liquid or suction lines in direct contact
with the floor or ceiling joist. Use an insulated or
suspension type of hanger. Keep both lines separate, and
always insulate the suction line. Long liquid line runs (30
feet or more) in an attic will require insulation. Route
refrigeration line sets to minimize length.

DO NOT let refrigerant lines come in direct contact with
foundation. When running refrigerant lines through the
foundation or wall, openings should allow for a sound and
vibration absorbing material to be placed or installed
between tubing and foundation. Any gap between
foundation or wall and refrigerant lines should be filled with
a pliable silicon-based caulk, RTV or a vibration damping
material.

Of Line Sets

Brazing

Connections

WARNING

FIRE H AZARD !

Refrigerant and oil mixture under pressure
could ignite as it escapes and contacts brazing
torch resulting in FIRE. M ake sure the
refrigerant charge is properly removed from
both the high and low sides of the system
before brazing any component or lines.

FAILURE TO DO SO COULD RESULT IN
BOD ILY INJURY O R DEATH.

Before making braze connections, be sure all joints are
clean. Before heat is applied for brazing, dry nitrogen
should be flowing through the tubing to prevent oxidation
and scale formation on the inside of the tubing.

The following is the recommended method for making
braze connections at the refrigerant line connections:

1. Debur and clean refrigerant tube end with emery
cloth or steel brush.

2. Insert tubing into swage fitting connection.

3. Apply heat absorbing paste or heat sink product to
prevent damage to the service valve.

4. Braze joint, using a suitable brazing alloy for copper
to copper joints.

5. Quench the joint and tubing with water using a wet
rag. Leave rag on fitting body and re—wet with
water to help cool area.

Leak Check

Refrigeration lines and indoor coil must be checked for
leaks after brazing and before evacuation. The
recommended procedure is to apply a trace amount of
vapor refrigerant (approximately two ounces or 3 psig) into
the line set and indoor coil, then pressurize with 150 psig
of dry nitrogen. Use a refrigerant leak detector to check all
joints. The system may also be checked for leaks using a
halide torch or pressure and soapy solution. After
completion of leak check, relieve all pressure from system
before evacuation.

Service

service valves with copper stubs. All service valves are
positioned to seal refrigerant in the unit with gauge ports
open to connecting lines. Gauge ports have Schraeder
valve core installed and require use of charging hoses with
depressors. DO NOT heat valve body above 250 degrees
F. Service valves must be wrapped with wet rags or
otherwise protected from heat during brazing. Use care to
ensure no moisture enters valves or Schraeder valve cores
if wet rags are used.

20407502 ISSUE 0144 Page 3 of 8

Valve Type

The outdoor condensing unit is supplied with sweat brass

Evacuating

NOTE: Intentional release of CFC or HCFC

These condensing units are pre-charged at the factory
with adequate refrigerant to handle 15 feet of refrigerant
tubing.

And Charging Instructions

refrigerant to the atmosphere violates
Federal Law. It may also violate State and
Local Codes. Check all Federal, State and
Local Codes before proceeding.

NOTE: DO NOT use any portion of the charge for

purging or leak testing. It is mandatory that
a thorough evacuation of the refrigeration
lines and indoor coil be performed.

The liquid line and suction line service valves have been

closed after final testing at the factory. DO NOT disturb

these valves until the lines have been leak checked and
evacuated or the charge in the unit may be lost.

1. Connect the vacuum pump to the center hose of the
manifold gauge set, the low-pressure manifold gauge
to the vapor service valve and the high pressure
manifold gauge to the liquid service valve.

NOTE: Unnecessary switching of hoses can be

avoided and complete evacuation of all lines
can be achieved by also connecting a
branch hose from the manifold gauge center
port to a cylinder of R-22. Provide a
separate shut-off valve to vacuum pump to
avoid contaminating vacuum pump oil with
refrigerant.

2. The valves should be kept in the "front seated"
(closed) position. This will allow evacuation of the
refrigeration lines and the indoor coil, without
disturbing the factory charge in the outdoor unit.

3. Follow the vacuum pump manufacturer's instructions.
Allow the pump to operate until the system has been
evacuated down to 300 microns. Allow the pump to
continue running for an additional 15 minutes. Turn
OFF the pump and leave the connections secured to
the two (2) service valves. After 5 minutes, if the
system fails to hold 500 microns or less, check all
connections for tight fit and repeat the evacuation
procedure.

4. Isolate the vacuum pump from the system by closing
the shutoff valves on the gauge-set. Disconnect the
vacuum pump.

Opening

After evacuation of the connecting lines, remove the
service valve cap and fully insert the hex wrench into the
stem. A back-up wrench is required on the valve body to
open the valve stem. Back-out counterclockwise until the
valve stem just touches the retaining ring.

Service Valves

Replace service valve cap and torque to 8-11 ft-lb on
1/4" and 3/8" valves; 12-15 ft-lb on 5/8" and 3/4" valves;
15-20 ft-lb on 7/8" valves.

NOTE: The cap is the primary seal and must be
tightened to prevent leaks.

Torque gauge port caps hand tight after adjusting charge
per "Adjusting Charge" section.

Electrical

Connections

WARNING

ELECTRICAL SHOCK HAZARD!

Turn OFF electric power before connecting
unit, performing any maintenance or
removing panels or doors.

FAILURE TO DO SO COULD RESULT IN BODILY
INJURY OR DEATH.

Be sure to check all local codes to determine that the
unit is installed accordance with local requirements.
Consult the National Electric Code for wire size
requirements. Use 60° C wire or higher. Always provide
ground connections to the outdoor unit. Power supply
must agree with rating on unit nameplate.

Provide line voltage power supply to unit from a properly
sized disconnect switch. Route power and ground wires
from disconnect switch to unit. Line voltage connections
are made at the line side of the contactor in the electrical
box of the condensing unit. Follow the appropriate wiring
diagram attached to inside of the access door of the unit.

Proper fusing recommendations are also indicated on
Unit Rating Plate. In general, the best fuse for any unit is
the smallest fuse that will hold equipment on line under
normal use and service without nuisance tripping breakers
or blowing of fuses. Time delay fuses are recommended
to prevent blowing due to starting current (the current in
rush when equipment starts is referred to as the Locked
Rotor Amps or (LRA). A fuse of this kind properly sized
will give maximum equipment protection.

CAUTION

BODILY INJURY HAZARD!

Control

This is not a backseating valve. Care must be
taken to prevent dislodging retainer ring when
opening valve.

FAILURE TO DO SO COULD RESULT IN BODILY
INJURY.

20407502 ISSUE 0144 Page 4 of 8

AWG is recommended for control wiring. Table 2 provides
a guideline for wire size and distance. For lengths longer
than 150 feet, contact your local distributor for technical
service.

Wiring

The control voltage is 24 Vac. High quality insulated 18

Table 2 - Control Wiring Size

For length of wire up to: Use minimum wire size of:

30 feet 22 AWG*
100 feet 20 AWG
150 feet 18 AWG

* Use only high

quality 22 AW G w ire

Ensure room thermostat is properly installed per
instructions shipped with room thermostat. Generally,
thermostat should not be exposed to sunlight, drafts or
vibration and should not be mounted on exterior walls.

Low voltage control wire connections should be made as
noted on the wiring diagram on the inside cover of the
outdoor unit. Generally, the connections from room
thermostat to indoor unit and

indoor unit to outdoor unit are
connected point to point (Y to Y, C to C, etc.), with points
as follows:

"Y" (compressor) - yellow
"C" (common) - black or brown
"G" (indoor fan) - green
"R" (24 Vac) - red
"O" (reversing valve) - orange (heat pump only)
"W" (first stage heat) - white (furnace only)
"W1" / "W2" (supplemental heat) - white (heat pump only)

Pre-Start

Procedure

1. Check to ensure:

• service valve caps are installed and tightened

• voltage supply at unit agrees with nameplate rating

• all factory and field wiring connections are tight

• indoor fan motor is on correct speed tap

2. Close electrical disconnects to energize system.

3. Energize crankcase heater, on units so equipped, for

8 hours before operating the units.

lengths other than 15 feet. For line sets shorter than 15
feet in length, remove charge per Table 3. For line sets
longer than 15 feet, add charge per Table 3. Oil charge is
sufficient for all line lengths.

Final charge adjustments must be in the cooling mode by
subcooling / superheat check, only when outdoor ambient
is above 60°F. If the outdoor ambient is below 60°F,
adjust charge only by weight and recheck later when
ambient is above 60°F.

Heat pumps should also have performance checked in
heating mode. The only acceptable method to charge a
heat pump in the heating mode is by weight.

Table 3 — Refrigeration Charge Adjustment

Liquid Line Diameter Oz. Per Linear Foot *

1/4"

5/16"

3/8"
1/2"

.25
.45
.60

1.20

* Factory charge for series is for 15' (ft.) line sets

and evaporator coil.

Before final adjustment is made to the refrigerant charge,
it is imperative proper indoor airflow be established.
Airflow will be higher across a dry coil versus a wet coil.
Blower charts are usually calculated with a dry coil.
Recommended airflow is 350-450 CFM per ton (12,000
Btuh) through a wet coil. Refer to indoor unit instructions
for methods of determining air flow and blower
performance.

With outdoor ambient above 60°F, the refrigerant charge
should be adjusted first by weight, then final adjustment by
super heat (for piston systems) or subcool (for TXV
systems).

Start-Up

Procedure

1. Set thermostat selector switch to OFF.

2. Set room thermostat at desired temperature. Be sure
set point is below indoor ambient temperature.

3. Set the system switch of the thermostat on COOL and
fan switch for continuous operation or AUTO, as
desired. Operate unit for 15-20 minutes, then check
the system refrigerant charge.

4. Adjust refrigerant charge per "Adjusting Charge"
section.

Piston

1. Operate unit for minimum of 10 minutes.

2. Measure pressure and temperature at vapor valve

3. Subtract saturation temperature (of measured

System Charging

service port. Use a good thermistor or electronic
thermometer.

pressure) from temperature measured to obtain
superheat. Refer to Table 4 for saturation
temperatures of R-22.

4. Measure outdoor dry bulb using a good thermometer

Adjusting

All split system units are factory charged for 15 feet of
connecting line set and matched evaporator coil.
Refrigerant charge should initially be adjusted for line set

20407502 ISSUE 0144 Page 5 of 8

Charge

and indoor wet bulb using a sling psychrometer.

5. Using measured temperatures, find closest outdoor dry
bulb and indoor wet bulb temperatures in the chart
inside control cover and locate required superheat.

6. If measured superheat is:

• more than required, slowly add refrigerant to obtain
required superheat.

• Less than required, slowly recover refrigerant to
obtain required superheat.

outdoor unit when required. The defrost function is
initiated and terminated based on time and temperature.
During frosting conditions, the compressor will operate for
30, 60 or 90 minutes (field adjustable, factory set for 90
minutes) before switching to the defrost mode.

NOTE: Each time charge is added to or removed

from the system, allow the system to run
approximately 15 minutes before
pressure/temperature readings are re-taken
and superheat calculations made.

TXV

System Charging

1. Operate unit for minimum of 10 minutes.

2. Measure pressure and temperature at liquid valve
service port. Use a good thermistor or electronic
thermometer.

3. Subtract measured temperature from saturation
temperature (of measured pressure) measured to
obtain subcooling. Refer to Table 4 for saturation
temperature of R-22.

4. The subcooling level should be as specified on the unit
specification sheet. In the absence of the specification
sheet, use 12-14°F subcooling.

5. If measured subcooling is:

• more than required, slowly recover refrigerant to

obtain required subcooling.

• less than required, slowly add refrigerant to obtain

required subcooling.

Defrost

System (Heat Pumps Only)

A defrost system consisting of a defrost thermostat
(mounted to the outdoor coil) and a defrost control board
(in the control box) provides automatic defrosting of the

In geographical areas where heavy snowfall, freezing
rain, or extensive operation in 20°F-40°F range is
expected, the setting should be changed to 30 or 60
minutes. This is performed by relocating the "RUN TIME"
jumper on the defrost board from the pins labelled "90" to
either the "30" or "60" pins.

The defrost board provides a five (5) minute time delay
for compressor short cycle protection. To bypass this
delay, short the two "TEST" terminals together for 2
seconds.

For defrost system checkout, with the system running in
the heating mode, short the two "TEST" terminals together.
The heat pump will go into the defrost mode for as long as
the "TEST" terminals are shorted together.

Maintenance

Unit

The unit should be inspected and cleaned on an annual
basis by a qualified technician. This should include
checking for adequate clearances, electrical connections,
duct connections/blockages, air filters, airflow, lubrication,
and operational performance of system. Coils may

require cleaning. The coil should always be cold when
cleaning. Use an alkaline-based cleaner only.
Cleaning a hot coil or using an acid based cleaner will
remove the paint from the fins and may clog the coil.

Table 4 - R-22 Saturation Temperature / Pressure Chart

Pressure

(psig)

Temp.

(°F)

Pressure

(psig)

Temp.

(°F)

Pressure

(psig)

Temp.

(°F)

Pressure

(psig)

Temp.

(°F)

Pressure

(psig)

Temp.

(°F)

Pressure

(psig)

Temp.

(°F)

19.3 -6 31.8 9 44.1 21 58.8 33 76.0 45 155.7 85

20.8 -4 32.8 10 45.3 22 60.1 34 77.6 46 168.4 90

22.4 -2 33.7 11 46.4 23 61.5 35 79.2 47 181.8 95

24.0 0 34.7 12 47.6 24 62.8 36 80.8 48 195.9 100

24.8 1 35.7 13 48.8 25 64.2 37 82.4 49 210.8 105

25.6 2 36.7 14 49.9 26 65.6 38 84.0 50 226.4 110

26.4 3 37.7 15 51.2 27 67.1 39 92.6 55 242.7 115

27.3 4 38.7 16 52.4 28 68.5 40 101.6 60 259.8 120

28.2 5 39.8 17 53.6 29 70.0 41 111.2 65 277.8 125

29.1 6 40.8 18 54.9 30 71.4 42 121.4 70 296.7 130

30.0 7 41.9 19 56.2 31 73.0 43 132.2 75 316.5 135

30.9 8 43.0 20 57.5 32 74.5 44 143.6 80 337.4 140

20407502 ISSUE 0144 Page 6 of 8

Home Owner's Information — Air Conditioners and Heat Pumps

Room Thermostat

The wall-mounted thermostat controls your air
conditioner. The thermostat is available in various
configurations from different manufacturers. The
information below is typical for most thermostats. Ask your
dealer for specific information regarding the model of
thermostat installed.

For Cooling Cycle switch the room thermostat system
lever to "Cool". The thermostat will turn the air conditioner
or heat pump on in the cooling mode until the selected
room temperature is achieved and then shut off
automatically.

For Heating Cycle switch the room thermostat system
lever to "Heat". The thermostat will turn the heat pump (or
furnace) on in the heating mode until the selected room
temperature is achieved and then shut off automatically.
On heat pumps systems only, sometimes an emergency
heat setting "EM HT" is available on the thermostat, which
will automatically cycle supplemental electric heat only to
heat your home.

Some room thermostats have a setting on the system
lever marked "AUTO" which will automatically change
between heating and cooling modes.

NOTE: Some heating and cooling units have a reset

feature which will allow you to reset the unit at the
thermostat after some abnormal condition has caused
safety switches to cut the unit off. If your unit has this
feature, switch the system lever to OFF and back to COOL
or HEAT. If you are in doubt which model you have, please
consult your Dealer.

For Fan Control your thermostat may have a Fan
Selection Switch that allows you to run the fan
continuously or cycle it automatically with the heating or
cooling system. Switch the lever to ON for continuous
operation and to AUTO for automatic cycling.

For maximum comfort satisfaction and continual air
cleaning/filtering, constant fan operation is recommended.

On models without a Fan Selection Switch, the fan will
always cycle with the outdoor unit.

Important

• Your system should never be operated without a clean

• Return air and supply air registers should be free from

• On heat pump systems, increasing your thermostat

• Air conditioners and heat pumps (in the cooling mode)

• During the heating cycle of heat pumps, air from the

• Outdoor heat pump sections may accumulate frost

• Defrost cycles typically occur every 90 minutes of unit

System Information

air filter properly installed.

restrictions or obstructions to allow full flow of air.

setting by more than 2 degrees may cause
supplemental heaters to turn on, reducing potential
energy savings.

remove humidity from your home. Depending on the
amount of moisture in the air inside your home, water
will trickle from the condensate drain of the cooling
coil.

registers may seem cool as the air being supplied
moves faster and at a more constant flow than a
conventional furnace. Additionally the air from a heat
pump is typically less than 95°F (instead of sudden
bursts of hot air), which may feel cool to your skin
since it is slightly less than your body temperature.
The air is sufficiently warm to maintain the temperature
setting of your thermostat.

during certain operating conditions. It is not abnormal
for the coil to become completely white with frost
before the unit will defrost. Heat pumps are designed
to maintain energy savings by defrosting only at
optimum times when frost accumulation starts to
significantly increase energy consumption.

run time, but can be adjusted to 30 or 60 minutes.
Defrost cycles will run until all frost is melted or for up
to 10 minutes before switching back into the heating
cycle automatically. Do not be alarmed if steam or fog
appears to be coming from the outdoor unit during the
defrost cycle. It is simply water vapor condensing into
a mist in the cold outside air.

20407502 ISSUE 0144 Page 7 of 8

Regular Maintenance Requirements

Your system should be regularly inspected by a qualified
service technician. These regular visits may include
(among other things) checks for:

• motor operation

• ductwork air leaks

• coil & drainpan cleanliness (indoor & outdoor)

• electrical component operation & wiring check

• proper refrigerant level & refrigerant leaks

• proper airflow

• drainage of condensate

• air filter(s) performance

• blower wheel alignment, balance & cleaning

• primary & secondary drain line cleanliness

• proper defrost operation (heat pumps)

There is some routine maintenance procedures you can
do to help keep your system operating at peak
performance between visits.

Filter

Air

Inspect air filters at least monthly and replace or clean as
required. Disposable filters should be replaced. Washable
filters may be cleaned by soaking in mild detergent and
rinsing with cold water. Replace filters with the arrows
pointing in the direction of airflow. Dirty filters are the most
common cause of poor heating / cooling performance and
compressor failures.

Use a soft bristle brush with light pressure only. DO
NOT damage or bend condenser coil fins. Damaged or
bent fins may affect unit operation.

Painted

of automobile wax should be applied every year. In
geographical areas where water has a high concentration
of minerals (calcium, iron, sulfur, ect.). It is recommended
that lawn sprinklers not be allowed to spray the unit. In
such applications, the sprinklers should be directed away
from the unit. Failure to follow this precaution may result
in premature deterioration of the unit finish and metal
components.

due to the corrosive atmosphere provided by the high salt
concentration in ocean mists and the air. Periodic washing
of all exposed surfaces and coil will add additional life to
your unit. Please consult your installing dealer for proper
procedures in your geographic area.

Surfaces

For maximum protection of the unit's finish, a good grade

In sea coastal areas, special maintenance is required

IF YOUR SYSTEM DOES NOT WORK, BEFORE

REQUESTING A SERVICE CALL:

Indoor

place, it should require minimal cleaning. Use a vacuum
cleaner and soft brush attachment to remove any
accumulation of dust from the top and underside of the
finned coil surface. However, perform this maintenance
only when the coil is completely dry.

dealer for service. It may need a detergent solution and
rinsing with water for cleaning, which may require coil
removal. You should not attempt this yourself.

Condensate

flow of drainage and clean if necessary.

Condenser

and fall off from trees can be drawn into coils by
movement of the air. Clogged condenser coils will lower
the efficiency of your unit and could cause damage to the
condenser. Periodically, debris should be brushed from
the condenser coils.

Coil

If the system has been operated with a clean filter in

If the coil cannot be cleaned by this method, call your

Drain

During cooling season check at least monthly for free

Coils

Grass cuttings, leaves, dirt, dust, lint from clothes dryers,

WARNING

SHARP OBJECT HAZARD!

Condenser coils have sharp edges. Wear
adequate body protection on body extremities
(e.g. gloves). Failure to follow this warning
could result in bodily injury.

1. Ensure thermostat is set below (cooling) or above

(heating) room temperature and that the system lever
is in the "COOL", "HEAT" or "AUTO" position.

2. Inspect your return air filter: If it is dirty your air

conditioner may not function properly.

WARNING

ELECTRICAL SHOCK HAZARD!

Turn OFF electric power to unit before
performing any maintenance or removing
panels or doors.

FAILURE TO DO SO COULD RESULT IN
BODILY INJURY OR DEATH.

3. Check indoor and outdoor disconnect switches.

Confirm circuit breakers are ON or that fuses have not
blown. Reset breakers/replace fuses as necessary.

4. Inspect the outdoor unit for clogged condenser coils,

(grass cuttings, leaves, dirt, dust or lint). Ensure that
branches, twigs or other debris are not obstructing the
condenser fan.

IF YOUR SYSTEM STILL DOES NOT OPERATE,
CONTACT YOU SERVICING DEALER.

Be sure to describe the problem, and have the model
and serial numbers of the equipment available.

20407502 ISSUE 0144 Page 8 of 8