Fedders AFPB24B1 Manuale utente

Electric Air Handler

TABLE OF CONTENTS

SERIES NOMENCLATURE . . . . . . . . . . . . . . . . . . . . . . . .1

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS .1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

INSPECTION AND UNPACKING . . . . . . . . . . . . . . . . . . . .2

NOTES TO INSTALLER . . . . . . . . . . . . . . . . . . . . . . . . . . .2

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Power Considerations . . . . . . . . . . . . . . . . . . . . . . .2

Electric Heat Kits . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Upflow Application . . . . . . . . . . . . . . . . . . . . . . . . .3

Horizontal Applicaton . . . . . . . . . . . . . . . . . . . . . . .4

Downflow Application . . . . . . . . . . . . . . . . . . . . . . .5

Connect Refrigerant Piping . . . . . . . . . . . . . . . . . . .6

Factory and Field installed Expansion Valves . . . . .6

Ductwork . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Return Air Ducting . . . . . . . . . . . . . . . . . . . . . . . . . .7

Return Air Platform Height . . . . . . . . . . . . . . . . . . .7

LINE VOLTAGE CONNECTIONS . . . . . . . . . . . . . . . . . . . .7

24 VOLT CONTROL SYSTEM . . . . . . . . . . . . . . . . . . . . . .8

CONDENSATE PLUMBING . . . . . . . . . . . . . . . . . . . . . . . .8

WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

BLOWER SPEED/STATIC OPERATION TABLE . . . . . . . .11

ELECTRIC HEAT KIT . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Heating Specifications . . . . . . . . . . . . . . . . . . . . . .13

WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

NOTE:

THESE INSTRUCTIONS ARE INTENDED AS AN AID TO QUALIFIED

SERVICE PERSONNEL FOR PROPER INSTALLATION,

ADJUSTMENT AND OPERATION OF THIS EQUIPMENT. READ

THE ENTIRE INSTRUCTION MANUAL THOROUGHLY BEFORE

ATTEMPTING INSTALLATION OR OPERATION.

SERIES NOMENCLATURE

A F P B 24 A1*A

Product Type

A=Air handler

Nominal BTUH

18 = 18,000 BTU/H (5.28 kW)

24 = 24,000 BTU/H (7.03 kW)

30 = 30,000 BTU/H (8.79 kW)

36 = 36,000 BTU/H (10.55 kW)

42 = 42,000 BTU/H (12.31 kW)

48 = 48,000 BTU/H (14.07 kW)

60 = 60,000 BTU/H (17.58 kW)

Brand Electrical Designation

1=208 / 230 Volts, 1Phase, 60 Hz

2=230 Volts, 1 Phase, 50 Hz

3 = 208 / 230 Volts, 3 Phase, 60 Hz

4=460 Volts, 3 Phase, 60 Hz

5=230 Volts, 3 Phase, 50 Hz

6=380 Volts, 3 Phase, 50 Hz

Design Series

Revision Letter

Motor

E=ECM

P=PSC

Chassis Size

B = 43 3/8” H x 18” W x 22” D

C = 48 1/8” H x 22” W x 26” D

RECOGNIZE SAFETY SYMBOLS, WORDS AND LABELS

What You Need To Know About Safety Instructions

Warning and Important Safety Instructions appearing in this

manual are not meant to cover all possible conditions and

situations that may occur. Common sense, caution and care

must be exercised when operating or cleaning tools and

equipment.

Always contact your dealer, distributor, service agent or

manufacturer about problems or conditions you do not

understand.

DANGER indicates an imminently hazardous situation which,

if not avoided, will result in death or serious injury.

This is the safety alert symbol. It is used to alert you to

potential personal injury hazards. Obey all safety messages

that follow this symbol to avoid possible injury or death.

WARNING indicates a potentially hazardous situation which,

if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if

not avoided, may result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates

apotentially hazardous situation which, if not avoided,

may result in property damage.

DANGER

WARNING

CAUTION

WARNING

IMPROPER INSTALLATION, ADJUSTMENT,

ALTERATION, SERVICE OR MAINTENANCE CAN

CAUSE INJURY, PROPERTY DAMAGE OR LOSS OF LIFE.

READ THIS MANUAL COMPLETELY BEFORE

BEGINNING ANY WORK AND FOLLOW ALL SAFETY

PRECAUTIONS.

AQUALIFIED INSTALLER MUST PERFORM

INSTALLATION AND SERVICE.

DO NOT DESTROY THIS MANUAL. PLEASE READ

CAREFULLY AND KEEP IN A SAFE PLACE FOR FUTURE

REFERENCE BY A SERVICE TECHNICIAN.

THESE INSTRUCTIONS ARE INTENDED AS AN AID TO

QUALIFIED SERVICE PERSONNEL FOR PROPER

INSTALLATION, ADJUSTMENT AND OPERATION OF

THIS COMPONENT. READ THESE INSTRUCTIONS

THOROUGHLY BEFORE ATTEMPTING INSTALLATION

OR OPERATION. FAILURE TO FOLLOW THESE

INSTRUCTIONS MAY RESULT IN IMPROPER

INSTALLATION, ADJUSTMENT, SERVICE OR

MAINTENANCE, POSSIBLY RESULTING IN FIRE,

ELECTRICAL SHOCK, PROPERTY DAMAGE, PERSONAL

INJURY OR DEATH.

BEFORE PERFORMING ANY WORK ON THIS

EQUIPMENT, POWER SUPPLY MUST BE TURNED OFF AT

THE HOUSEHOLD SERVICE BOX TO AVOID THE

POSSIBILITY OF SHOCK, INJURY, DAMAGE TO

EQUIPMENT, OR DEATH.

DO NOT STORE OR USE GASOLINE OR OTHER

FLAMMABLE VAPORS AND LIQUIDS, OR OTHER

COMBUSTIBLE MATERIALS IN THE VICINITY OF THIS

AIR HANDLER OR ANY OF ITS MATCHING SYSTEM

COMPONENTS (CONDENSING UNIT, HEAT PUMP OR

FURNACE).

WARNING

DO NOT, UNDER ANY CIRCUMSTANCES, CONNECT

RETURN DUCTWORK TO ANY OTHER HEAT-PRODUCING

DEVICE SUCH AS FIREPLACE INSERT, STOVE, ETC.

UNAUTHORIZED USE OF SUCH DEVICES MAY RESULT IN

FIRE, CARBON MONOXIDE POISONING, EXPLOSION,

PERSONAL INJURY, OR PROPERTY DAMAGE.

Location

All models are approved for alcove, closet, and attic installation

in the upflow, downflow or horizontal position. Refer to the

applicable section of this manual on pages 3-5 for specific

installation instructions on each position.

The air handler must be installed in a level position and should

be located for ease in connecting air duct with proper air

distribution.

Exterior surface of cabinet may sweat when unit is installed in

non-air-conditioned space such as attic or garage. Installer must

provide protection such as full-size auxiliary drain pan on all

units. Be sure to allow for filter access for periodic user servicing.

In addition, caulking must be applied around the power and

control wires entering the control box. This will prevent air

leakage into and condensate from forming inside the control

box.

Clearances

Clearances from the air handler to the combustibles are zero

inches from all sides, top, and bottom; one inch from discharge

air plenum; and the duct within 36 inches of the plenum.

Provide adequate space for servicing the air handler; at least 30

inches. All service and maintenance can be performed from the

front access doors of the air handler.

NOTES TO INSTALLER

The words “SHALL” and “MUST” indicate a requirement which

is essential to satisfactory and safe product performance. The

words “SHOULD” and “MAY” indicate a recommendation or

advice which is not essential and not required but which may

be useful or helpful.

The instructions are for the use of qualified individuals specially

trained and experienced in the installation of this type

equipment and related system components.

Installation and service personnel are required by some locales

to be licensed. Persons not qualified shall not install this

equipment nor interpret these instructions.

INTRODUCTION

Models AFPB and Plare designed for flexibility and can be used

for upflow, horizontal or downflow applications. These units

are available for systems of 18,000 through 60,000 BTUH

nominal cooling capacity. Factory authorized electric heater kits

are available in 5 kW through 20 kW sizes. See product

specifications for available accessory kits.

INSPECTION AND UNPACKING

Athorough inspection of the shipping container must be made

immediately upon receiving your unit. Look for any punctures

or openings, and if it appears damage has occurred, note it on

the freight bill before signing. Contact delivering carrier

immediately to inspect damage. Do not begin installation work

should begin until this inspection is completed.

INSTALLATION

Codes

The installer must comply with all local, state and federal codes

and/or regulations pertaining to this type of equipment and its

installation. Such codes and/or regulations shall take precedent

over any recommendations contained herein. If there are no

local codes on the subject, installations shall be made in

accordance with the National Electrical Code (NEC) and

recommendations made by the National Board of Fire

Underwriters.

Power Considerations

The installer shall check available power to make certain it

matches the unit name plate rating and that constant voltage

can be maintained on the unit. Unsatisfactory performance or a

possible hazard could otherwise result. The local power

company should be contacted with questions concerning power

supply.

Electric Heater Kits

Only EEB/EEC series electric heater kit may be installed into the

air handler. See Electric Heat section on page 12 for more

information.

Upflow Applicaton

In an upflow application normally a duct is employed as a return air means as shown in Figure 1 below

oraplatform is installed as in Figure 2.

DISCHARGE DUCT (600 FPM)

24” MINIMUM

RETURN DUCT WITH A MINIMUM OF

1/2” FIBERGLASS DUCT LINER (500 FPM).

REFER TO LOCAL CODES.

AIR

HANDLER

(MAY ALSO BE

DOWNFLOW)

DISCHARGE DUCT (600 FPM)

24” MINIMUM

RETURN

GRILLE

(500FPM)

RETURN PLATFORM LINED WITH

1” FIBERGLASS INSULATION.

REFER TO LOCAL CODES.

CLOSET

AIR HANDLER

Upflow Installation With Return Duct

DISCHARGE DUCT (600 FPM)

24” MINIMUM

RETURN DUCT WITH A MINIMUM OF

1/2” FIBERGLASS DUCT LINER (500 FPM).

REFER TO LOCAL CODES.

AIR

HANDLER

(MAY ALSO BE

DOWNFLOW)

DISCHARGE DUCT (600 FPM)

24” MINIMUM

RETURN

GRILLE

(500FPM)

RETURN PLATFORM LINED WITH

1” FIBERGLASS INSULATION.

REFER TO LOCAL CODES.

CLOSET

AIR HANDLER

Upflow Installation With Return Platform

111

112

SUPPLY

AIR

SERVICE

PLATFORM CEILING

JOISTS

AIR HANDLER SUPPORTS

(FIELD SUPPLIED)

AUXILIARY DRAIN PAN

(FIELD FABRICATED) P-TRAP PRIMARY

DRAIN LINE

RETURN AIR

AUXILIARY

DRAIN LINE

Horizontal Installation

Horizontal Application

This type of position is usually used in an attic or crawl space. The air

handler may be laid on the left or right side for horizontal applications.

The factory-installed coil is intended for left-side-down installation.

This type of installation requires a return air duct to be attached to the

air handler inlet. The opposite end of the return air duct is then routed

to a return air grille mounted to the ceiling or wall. This duct MUST be

no smaller than the inlet opening of the air handler.

For Horizontal Right Application:

1. Remove front panels from the air handler.

2. Remove coil assembly from the air handler.

3. Remove horizontal drain pan from left hand side of air handler and

re-install on right hand side. Change splash baffle location from left

hand to right hand side of drain pan flange.

4. Remove the horizontal coil support bracket from the right hand side

of the air handler.

5. Reinstall coil assembly in the air handler.

6. Reattach coil support bracket to the left hand side of the air

handler.

7. Replace front panels.

CAUTION

Horizontal applications in unconditioned areas, such

as attics above a ceiling, require special

precautionary measures. An auxiliary drain pan

having at least two inches overall clearance around

the unit MUST be field-fabricated and installed as

shown below.

The drain outlet and drain line for the auxiliary

drain pan need not be trapped but should be sloped

to a suitable drain.

CAUTION

For optimum condensate drainage performance in

horizontal installations, unit should be leveled

along the length and width. Failure to follow this

caution may result in product or property damage.

CAUTION

AP-type trap must be installed in the primary drain

line as shown in figure 3 below.

113

Downflow Application

Installation Considerations

•No downflow sub-base is required with this air

handler, however, local codes may require the use

of a non-combustible sub-base when used with

electric heater kit.

•An “L” or “T” shaped duct enclosure MUST be used

as a supply plenum. No registers or outlets SHALL be

located directly below the air handler supply outlet.

•Size and frame the floor opening as shown in Figure 5.

Refer to the Dimension drawing on page 10. Care

MUST be taken not to overcut the floor opening.

•Caulk around the floor opening with a non-

flammable caulk such as silicone. Set the air handler

in place and secure the air handler properly.

• Allow access to the low voltage connection by

building the platform so that there is a minimum of

51/2" between the floor and the unit flange.

Return Air Filter Clearance

On downflow applications, certain coil models will

protrude from the top of the air handler (coils greater

than 15" tall on A24 through A36 air handlers and coils

greater than 18" on A42 through A60 air handlers). On

these models, the return air filter may be removed and

aseparate filter grille may be installed for closet

applications.

If this method is not desirable, cabinet extension kit No.

65-1647 for A24, A30, and A36; or No.65-1649 for A42,

A48, and A60 may be ordered. The extension kit screws

to the side of the air handler and extends the length of

the air handler coil cabinet. In addition, the kit includes

afilter compartment and door.

Emergency Drain Opening

The indoor coil emergency drain opening must be used

for this application. Refer to page 8 for instructions on

condensate tubing.

1. Remove coil access door.

2. Slide coil out of air handler.

3. Remove coil rack from air handler by removing

screws from side of air handler.

4. Relocate rack in air handler as shown in Figure 4

using screws from side of air handler.

5. Turn air handler into downflow position.

6. Slide refrigerant coil into air handler.

7. Reverse and replace air handler door(s).

Relocating Coil

Removethe three

screws on both sides.

Flip over and replace

in newposition using

pre-punched holes.

UPFLOW

POSITION

SUPPLY

OPENING

RACK

POSITION

FILTER

DOOR

DOWNFLOW

POSITION

SUPPLY

OPENING

FILTER

DOOR

Relocating Coil for Downflow Position

UNIT

FLANGE

5 1/2”

FLOORFLOOR

PLENUM

AIR HANDLER

2 X 6 BOTH

SIDES AND BACK

114

115 Supply Plenum Floor Opening

CAUTION

The coil MUST be relocated for downflow

application.

CAUTION

THE TXV SENSING BULB CAN BE DAMAGED BY

EXTREME HEAT FROM BRAZING. THE BULB SHOULD

BE REMOVED BEFORE PERFORMING ANY BRAZING

PROCEDURE AND NOT INSTALLED UNTIL AFTER THE

VAPOR AND LIQUID LINES ARE BRAZED AND LEAK

CHECKED.

Connect Refrigerant Piping

Use field supplied tubing of refrigerant grade. Suction tube

must be insulated. Do not use damaged, dirty, or

contaminated tubing because it may plug refrigerant flow

control device. ALWAYS evacuate the coil and field supplied

tubing before opening outdoor unit service valves.

Factory and Field-Installed Expansion Valves

1. The bulb and capillary tubing should be routed outside

of the case. Make sure the capillary tube will not contact

any sharp edges of the case. On factory installed

expansion valves, the adjustable sensing bulb is not

permanently installed onto the coils’ vapor line in order

to allow easy removal during installation.

4o’clock8 o’clock

Sensing bulb

attached with

clamps

Vapor line

4o’clock8 o’clock

Attach bulb to

vapor line at four

or eight o’clock

position

CAUTION

THE TXV VALVE CAN BE DAMAGED BY EXTREME

HEAT. PROPER PRECAUTIONS SHOULD BE TAKEN TO

AVOID OVERHEATING THE TXV VALVE AND CAUSING

DAMAGE TO THE INTERNAL COMPONENTS.

3. Attach the bulb securely with the copper strap provided.

4. Insulate the bulb thoroughly with a suitable insulation

material such as cork tape.

5. Coils with TXVs should be charged 10-12 degrees

(+ or – one degree) of sub-cooling. This supercedes any

subcooling value listed with condensing unit’s literature.

For the majority of installations no adjustment to the

TXV setting is required. However, if the measured

superheat is less than 4°or greater than 8°an

adjustment is required. The adjustment stem is at the

base of the valve under the flare nut. To increase

superheat, tighten the stem clockwise and to decrease

superheat, back-out the stem counter-clockwise. Use a

1/4”refrigeration service wrench for this function.

NOTE:

When removing refrigerant, always use standard reclaim

procedures.

2. To assure accurate sensing and the best performance the

bulb should be placed on a horizontal section of the

vapor line at the four or eight o’clock position and at

least 6” from the coil manifold.

TXV valve can be accessed

through the valve cover-plate

on the front of the air handler.

WARNING

ALWAYS HAVE A FIRE EXTINGUISHER AVAILABLE

WHEN WORKING WITH AN OPEN FLAME.

ALWAYS USE SAFETY GLASSES, PROTECTIVE

CLOTHING, AND WORK GLOVES.

117

116

Return Air Ducting

The dimensions of the return air duct or platform must be at a

minimum the same size as the return air opening on the air

handler, regardless of the air handler position.

When framing a return air platform, the opening size should be

as shown below. If the air handler is to be installed in a closet,

be sure to allow room for wiring and refrigerant lines.

Return Air Platform Height

If the air handler is to be used in the upflow position, the height

of the return air platform should be no smaller than the height

listed below for the specific model of air handler.

MODEL A B C D E F

IN CM IN CM IN CM IN CM IN CM IN CM

Platform

Model Height

Inches Cm

AFPB24A1, AFPB24B1 12 30.5

AFPB36A1 14 35.6

AFPC48A1, AFPC48B1 16 40.6

AFPC60A1, AFPC60B1 18 45.7

Framed-in

Opening

Air

Handler

Bottom

Top View

AFPB24A1

AFPB24B1

AFPB36A1

AFPC48A1

AFPC48B1

AFPC60A1

AFPC60B1

14 37.3 141/436.2 2 5 2 5 4 10.1 4 10.1

14 37.3 141/436.2 2525410.1 410.1

163/841.6 221/456.5 37.6 3 7.6 13/44.4 25

163/841.6 221/456.5 3 7.6 3 7.6 13/44.4 2 5

118

WARNING

BEFORE PERFORMING ANY WORK ON THIS EQUIPMENT,

POWER SUPPLY MUST BE TURNED OFF AT THE

HOUSEHOLD SERVICE BOX TO AVOID THE POSSIBILITY

OF SHOCK, INJURY, DAMAGE TO EQUIPMENT OR DEATH.

LINE VOLTAGE CONNECTIONS

1. The power supply can be connected through the right side

or top of the air handler. Conduit knockouts are provided

for 1/2”, 3/4”, 1”, and 11/4”conduit.

2. Refer to the Control System section for recommended low-

voltage wire gauges.

3. See Power Supply Table on page 9 for power supply

specifications.

4. Use only copper conductors for supply wiring.

5. The air handler must be permanently grounded.

The ground lug is located in the field wiring box.

Conduit knockouts

Right side of

air handler

Top of air

handler

119

1110

Grounding lug

Field wiring box

(detail)

Conduit knockouts

Ductwork

This air handler shall not be installed without supply plenums

and proper ducting. Connect supply air duct over 1/2“ flanges on

supply air opening. Secure duct to flange and seal connection.

Use flexible connectors between ductwork and unit at discharge

connection. Ductwork passing through unconditioned space

must be insulated and covered with vapor barrier.

Conduit Knockout Locations

Grounding Lug Location

THERMOSTAT EEC HEATER MODEL

TYPE 5 7.5 10 15 20

SINGLE STAGE .4 .4 .4 .8 .8

TWO 1ST N/A N/A N/A .4 .4

STAGE 2ND N/A N/A N/A .4 .4

Connection to unit

Wire low voltage in accordance with wiring label on the blower.

Use no. 18 AWG wire to make the low voltage connections

between the thermostat, the unit, and the outdoor equipment.

If the thermostat is located more than 100 feet from the unit

use 16 AWG wire. All wiring must be NEC Class 1 and must be

separated from incoming power leads.

The thermostat preheat anticipator should be adjusted to match

the current listed below for the EEC model heat assembly to be

installed.

Transformer Information

The low-voltage transformer is equipped with a 208- or 230-volt

tap. The transformer is factory wired for 230-volt operation. For

208-volt operation, remove the yellow wire from the 230-volt

terminal and install it onto the 208-volt terminal.

The acceptable voltage range for each tap is as follows:

Tap Voltage Range

230 207 – 253

208 187 – 229

Time Delay Relay Information

Afan relay is provided to control the operation of the indoor

fan motor. All models are equipped with a time delay “OFF”-

type fan relay which will allow the fan motor to continue to

operate for a preset time after the relay is de-energized.

When used with a heat pump, the heat output must be staged

for models above 10 kW. W1 should be wired as auxiliary heat

to assist the heat pump. W2 must only be wired as emergency

heat. Both stages of heat should never be wired so as to be

energized while the heat pump is operating. See the Blower

Speed/Static Table for maximum allowable auxiliary first-stage

heat. All EEC series electric heat assemblies over 10 kW have

breakers factory-installed on the heat assembly.

WARNING

BEFORE PERFORMING ANY WORK ON THIS EQUIPMENT,

POWER SUPPLY MUST BE TURNED OFF AT THE

HOUSEHOLD SERVICE BOX TO AVOID THE POSSIBILITY OF

SHOCK, INJURY, DAMAGE TO EQUIPMENT, OR DEATH.

WARNING

IMPROPER INSTALLATION OF THE ELECTRICAL WIRING

OR THE HEAT ASSEMBLY MAY RESULT IN FIRE, SERIOUS

PERSONAL INJURY, OR DEATH.

UNIT

FLEXIBLE

TUBING-HOSE

OR PIPE

DRAIN

CONNECTION

APOSITIVE LIQUID

SEAL IS REQUIRED

2” MINIMUM

3” MINIMUM

Install condensate drain trap as close to the coil as possible.

Use drain connection size or larger. Do not operate unit

without trap (see illustration below.) Unit must be level or

slightly inclined toward drain.

CAUTION

1. Do not connect the drain line to a closed sewer.

2. Never terminate an open sewer or drain connection

within the return air duct, platform or return plenum.

3. Pitch the drain line at least 1/4”per foot away from the

drain pan.

4. If condensate drain connection is on the negative side of

the blower, a trap must be installed to ensure positive

drainage.

5. Condensate drain lines should not be reduced in size

from the connection size supplied.

6. The drain line should be insulated where necessary, to

prevent sweating and damage due to condensate

forming on the outside surface of the line.

7. Test condensate drain line with water before operating

system.

8. If unit is located in or above a living space where

damage may result from condensate overflow, a field

supplied, external condensate pan should be installed

under the entire unit, and a secondary condensate line

(with appropriate trap) should be run from the unit into

the pan. Any condensate in this external condensate

pan should be drained to a noticeable place. As an

alternative to using an external condensate pan, some

localities may allow the running of a separate 3/4”

condensate line (with appropriate trap) per local code

to a place where the condensate will be noticeable.

CAUTION

For downflow, or any installation where condensate

overflow could create a hazard or water damage, the

emergency drain fitting MUST be used. The emergency

drain MUST be left open. If the emergency drain has to be

piped away from the air handler, its outlet MUST be

installed in a location that would allow any drainage to be

immediately noticed.

Condensate Drain Trap

CONDENSATE DRAIN PLUMBING

24 VOLT CONTROL SYSTEM

1111

POWER SUPPLY TABLE

SINGLE CIRCUIT SUPPLY DUAL CIRCUIT SUPPLY

kW Phase No. of MBTUH Heat Min. Max. Wire Ground Min. Wire Max. Fuse Wire Size Ground Size

230 Supply 208/230 Load Wire Fuse Size Size Ampacity Size Ckt1 Ckt2 Ckt3 Ckt1 Ckt2 Ckt3

VAC Circuits Amps Ampacity Size AWG MM2

0 1 1 - - 5.0 15 14 2.1

5* 1 1 12.6 / 17.1 20.9 30 30 10 5.3

10* 1 1 25.6 / 34.1 41.7 57 60 6 13.3

15* 1 1 or 2 38.4 / 51.2 62.5 83 90 4 21.2

20* 1 1 or 2 51.2 / 68.2 83.4 109 110 2 33.6

AWG MM2Ckt1 Ckt2 Ckt3 Ckt1 Ckt2 Ckt3 AWG MM2AWG MM2AWG MM2AWG MM2AWG MM2AWG MM2

14 2.1 – – – – – – – – – – – – – – – – – –

10 5.3 – – – – – – – – – – – – – – – – – –

10 5.3 ––––––––––––––––––

8 8.4 57 26 – 60 30 – 6 13.3 10 5.3 – – 10 5.3 10 5.3 – –

6 13.3 57 53 – 60 60 – 6 13.3 6 13.3 – – 10 5.3 10 5.3 – –

*kW does not include motor watts.

Ampacities and over current protection based on largest air handler motor load. Refer to specific name plate for exact ampacity and overcurrent protection size.

Minimum wire ampacity values are used for sizing field power conductors. Refer to the National Electrical Code (latest version), Article 310, for sizing conductors. When more than three current-carrying

conductors are in the same conduit, the conductor’s ampacity MUST be derated. See Note 8 of Table 310 for ampacity adjustment factors.

Maximum size fuse or HACR-type circuit breaker for field wiring protection.

Wire size based on 75°C copper wire with no more than three current-carrying conductors in the same conduit. All wiring MUST conform to the National Electrical Code and all local codes.