Bryant LEGACY 223A User manual

Installation Instructions

MODEL 223A / 224A

LEGACYTSERIES HEAT PUMP

WITH PURONRREFRIGERANT

SIZES 018 TO 060

1--1/2 TO 5 NOMINAL TONS

a05236

Fig. 1 --- 223A / 224A

NOTE: Read the entire instruction manual before starting the

installation.

TABLE OF CONTENTS

PAGE

SAFETY CONSIDERATIONS 2.......................

INSTALLATION RECOMMENDATIONS 2.............

INSTALLATION 3--12..............................

Step 1 -- Check Equipment & Jobsite 3...............

Step 2 -- Install on Solid Pad 3......................

Step 3 -- Clearance Requirements 3..................

Step 4 -- Operating Ambient 3......................

Step 5 -- Elevate Unit 3...........................

Step 6 -- Install TXV 3 -- 4.........................

Step 7 -- Check Defrost Thermostat 5.................

Step 8 -- Make Piping Connections 5 -- 7..............

Step 9 -- Make Electrical Connections 7 -- 8............

Step 10 -- Compressor Crankcase Heater 8.............

Step 11 -- Install Electrical Accessories 8..............

Step 12 -- Start--Up 9 -- 11..........................

Step 13 -- Check Charge 12.........................

Step 14 -- Final Checks 12..........................

CARE AND MAINTENANCE 12......................

PURON REFRIGERANT QUICK REFERENCE GUIDE 14

SAFETY CONSIDERATIONS

Improper installation, 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

instructions packaged with the kits or accessories when installing.

Follow all safety codes. Wear safety glasses, protective clothing,

and work gloves. Use quenching cloth for brazing operations.

Have 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

and National Electrical Code (NEC) for special requirements.

Recognize safety information. This is the safety--alert symbol !

When you see this symbol on the unit and in instructions or

manuals, be alert to the potential for personal injury.

Understand these signal words; DANGER, WARNING, and

CAUTION. These words are used with the safety--alert symbol.

DANGER identifies 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 personal

injury or product and property damage. NOTE is used to

highlight suggestions which will result in enhanced installation,

reliability, or operation.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Before installing, modifying, or servicing system, main

electrical disconnect switch must be in the OFF

position. There may be more than 1 disconnect switch.

Lock out and tag switch with a suitable warning label.

INSTALLATION RECOMMENDATIONS

NOTE: In some cases noise in the living area has been traced to

gas pulsations from improper installation of equipment.

1. Locate unit away from windows, patios, decks, etc. where

unit operation sound may disturb customer.

2. Ensure that vapor and liquid tube diameters are

appropriate for unit capacity.

3. Run refrigerant tubes as directly as possible by avoiding

unnecessary turns and bends.

4. Leave some slack between structure and unit to absorb

vibration.

5. When passing refrigerant tubes through the wall, seal

opening with RTV or other pliable silicon--based caulk.

(See Fig. 2.)

6. Avoid direct tubing contact with water pipes, duct work,

floor joists, wall studs, floors, and walls.

7. Do not suspend refrigerant tubing from joists and studs

with a rigid wire or strap which comes in direct contact

with tubing. (See Fig. 2.)

8. Ensure that tubing insulation is pliable and completely

surrounds vapor tube.

9. When necessary, use hanger straps which are 1 in. wide

and conform to shape of tubing insulation. (See Fig. 2.)

10. Isolate hanger straps from insulation by using metal

sleeves bent to conform to shape of insulation.

INSULATION

VAPOR TUBE

LIQUID TUBE

OUTDOOR WALL INDOOR WALL

LIQUID TUBE

VAPOR TUBE

INSULATION

CAULK

Avoid contact between tubing and structureNOTE:

THROUGH THE WALL

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)

JOIST

1″MIN.

SUSPENSION

A94028

Fig. 2 --- Connecting Tubing Installation

When outdoor unit is connected to factory--approved indoor unit,

outdoor unit contains system refrigerant charge for operation with

ARI rated indoor unit when connected by 15 ft. of field--supplied

or factory accessory tubing. For proper unit operation, check

refrigerant charge using charging information located on control

box cover and/or in the Check Charge section of this instruction.

IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all

residential applications including long line.

IMPORTANT: Always install the factory--supplied liquid--line

filter drier. Obtain replacement filter driers from your distributor

or sales office.

223A / 224A

INSTALLATION

STEP 1 —Check Equipment and Job Site

Unpack Unit

Move to final location. Remove carton taking care not to damage

unit.

Inspect Equipment

File claim with shipping company prior to installation if shipment

is damaged or incomplete. Locate unit rating plate on unit corner

panel. It contains information needed to properly install unit.

Check rating plate to be sure unit matches job specifications.

STEP 2 —Install on a Solid, Level Mounting Pad

If conditions or local codes require the unit be attached to pad, tie

down bolts should be used and fastened through knockouts

provided in unit base pan. Refer to unit mounting pattern in Fig.

3 to determine base pan size and knockout hole location.

For hurricane tie downs, contact distributor for details and PE

Certification (Professional Engineer), if required.

On rooftop applications, mount on level platform or frame. Place

unit above a load--bearing wall and isolate unit and tubing set

from structure. Arrange supporting members to adequately

support unit and minimize transmission of vibration to building.

Consult local codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph may require

wind baffles. Consult the Service Manual -- Residential Split

System Air Conditioners and Heat Pumps for wind baffle

construction.

NOTE: Unit must be level to within ±2°(±3/8 in./ft.) per

compressor manufacturer specifications.

STEP 3 —Clearance Requirements

When installing, allow sufficient space for airflow clearance,

wiring, refrigerant piping, and service. Allow 30--in. clearance to

service end of unit and 48 in. above unit. For proper airflow, a

6--in. clearance on 1 side of unit and 12 in. on all remaining sides

must be maintained. Maintain a distance of 24 in. between units.

Position so water, snow, or ice from roof or eaves cannot fall

directly on unit..

3/8 ---in. Dia. Tiedown

Knockouts in Basepan

(2) Places

View From Top

UNIT BASE PAN

DIMENSIONS

TIEDOWN KNOCKOUT LOCATIONS

A B C

26 X 26 9–1/8 4–7/16 21–1/4

31–1/2 X 31–1/2 9–1/8 6–9/16 24–11/16

35 X 35 9–1/8 6–9/16 28–7/16

A05177

Fig. 3 --- Tiedown Knockout Requirements

On rooftop applications, locate unit at least 6 in. above roof

surface.

STEP 4 —Operating Ambient

The minimum outdoor operating ambient in cooling mode is

55°F, and the maximum outdoor operating ambient in cooling

mode is 125°F. The maximum outdoor operating ambient in

heating mode is 66 °F.

STEP 5 —Elevate Unit

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Unit must be kept free of an accumulation of water

and/or ice in the basepan.

Elevate unit per local climate and code requirements to provide

clearance above estimated snowfall level and ensure adequate

drainage of unit. If using accessory support feet, use installation

instructions from kit for installation.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Ensure that unit is located with the supports such that

the unit is stable in all circumstances including adverse

conditions.

STEP 6 —Install TXV

NOTE: Applies to non--TXV indoor units only. If installing a

rated and approved indoor coil without a factory installed

PuronRTXV, remove and replace the fixed orifice or R--22

TXV expansion device with a hard shutoff Puron TXV.

The thermostatic expansion valve is specifically designed to

operate with Puron Refrigerant. Do not use an R--22 TXV. An

existing R--22 TXV must be replaced with a factory approved

TXV specifically designed for Puron Refrigerant. Refer to

Product Data Digest for the appropriate TXV kit number.

CAUTION

UNIT OPERATION HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

All indoor coil units must be installed with a hard

shutoff Puron TXV metering device.

IMPORTANT: If not factory installed, the TXV should be

mounted as close to the indoor coil as possible and in a vertical,

upright position. Avoid mounting the inlet tube vertically down.

Valve is more susceptible to malfunction due to debris if inlet

tube is facing down. A factory--approved filter drier must be

installed in the liquid line.

223A / 224A

Installing TXV in Place of Piston

1. Pump system down to 2 psig and recover refrigerant.

2. Remove hex nut from piston body. Use backup wrench on

fan coils.

3. Remove and discard factory--installed piston. Be sure

TeflonRseal is in place.

4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.

NOTE: If the piston is not removed from the body, TXV will

not function properly.

CAUTION

EQUIPMENT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Use a brazing shield and wrap TXV with wet cloth or

use heat sink material.

5. Install TXV on indoor coil liquid line. Sweat swivel

adapter to inlet of indoor coil and attach to TXV outlet.

Use backup wrench to avoid damage to tubing or valve.

Sweat inlet of TXV, marked “IN” to liquid line. Avoid

excessive heat which could damage valve.

6. Install vapor elbow with equalizer adapter to suction tube

of line set and suction connection to indoor coil. Adapter

has a 1/4--in. male connector for attaching equalizer tube.

7. Connect equalizer tube of TXV to 1/4--in. equalizer fitting

on vapor line adapter.

8. Attach TXV bulb to horizontal section of suction line

using clamps provided. Insulate bulb with field--supplied

insulation tape. See Fig. 4 for correct positioning of

sensing bulb.

9. Proceed with remainder of unit installation.

2 O'CLOCK

10 O'CLOCK

SENSING BULB

STRAP

SUCTION TUBE

8 O'CLOCK 4 O'CLOCK

⁄

IN. OD & SMALLER LARGER THAN

⁄

IN. OD

A81032

Fig. 4 --- Position of Sensing Bulb

Replacing TXV on R--22 Indoor Coil

1. Pump system down to 2 psig and recover refrigerant.

2. Remove coil access panel and fitting panel from front of

cabinet.

3. Remove TXV support clamp using a 5/16--in. nut driver.

Save the clamp.

4. Remove R--22 TXV using a backup wrench on flare

connections to prevent damage to tubing.

5. Using wire cutters, cut equalizer tube off flush with vapor

tube inside cabinet.

6. Remove bulb from vapor tube inside cabinet.

7. Braze equalizer stub--tube closed. Use protective barrier as

necessary to prevent damage to drain pan.

IMPORTANT: Route the equalizer tube of Puron TXV through

suction line connection opening in fitting panel prior to replacing

fitting panel around tubing.

8. Install TXV with 3/8--in. copper tubing through small hole

in service panel. Use wrench and backup wrench, to avoid

damage to tubing or valve, to attach TXV to distributor.

9. Reinstall TXV support clamp (removed in item 3).

10. Attach TXV bulb to vapor tube inside cabinet, in same

location as original was when removed, using supplied

bulb clamps (nylon or copper). See Fig. 4 for correct

positioning of sensing bulb.

11. Route equalizer tube through suction connection opening

(large hole) in fitting panel and install fitting panel in

place.

12. Sweat inlet of TXV, marked IN to liquid line. Avoid

excessive heat which could damage valve.

13. Install vapor elbow with equalizer adapter to vapor line of

line set and vapor connection to indoor coil. Adapter has

a 1/4--in. male connector for attaching equalizer tube.

14. Connect equalizer tube of TXV to 1/4--in. equalizer fitting

on vapor line adapter. Use backup wrench to prevent

damage to equalizer fitting.

15. Proceed with remainder of unit installation.

A05226

Fig. 5 --- Liquid Service Valve with Sweat Adapter Tube

223A / 224A

STEP 7 —Check Defrost Thermostat

Check defrost thermostat to ensure it is properly located and

securely attached. There is a liquid header with a brass distributor

and feeder tube going into outdoor coil. At the end of the one of

the feeder tubes, there is a 3/8 in. O.D. stub tube approximately 2

in. long. (See Fig. 6.) The defrost thermostat should be located on

stub tube. Note that there is only one stub tube used with liquid

header, and on most units it is the bottom circuit.

FEEDER TUBE

DEFROST

THERMOSTAT

STUB TUBE

A97517

Fig. 6 --- Defrost Thermostat Location

STEP 8 —Make Piping Connections

!WARNING

PERSONAL INJURY AND UNIT DAMAGE

HAZARD

Failure to follow this warning could result in personal

injury or death.

Relieve pressure and recover all refrigerant before

system repair or final unit disposal.

Use all service ports and open all flow--control

devices, including solenoid valves.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

If ANY refrigerant tubing is buried, provide a 6--in. vertical

rise at service valve.

Refrigerant tubing lengths up to 36--in. may be buried

without further special consideration. Do not bury lines

longer than 36 in.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

To prevent damage to unit or service valves, observe the

following:

SUse a brazing shield

SWrap service valves with wet cloth or use a heat sink

material.

Outdoor units may be connected to indoor section using

accessory tubing package or field--supplied refrigerant grade

tubing of correct size and condition. For tubing requirements

beyond 80 ft., substantial capacity and performance losses can

occur. Following the recommendations in the Long Line

Guideline for Split--System Air Conditioners and Heat Pumps

will reduce these losses. Refer to Table 1 for accessory

requirements. Refer to Table 2 for field tubing diameters.

If refrigerant tubes or indoor coil are exposed to atmosphere, they

must be evacuated to 500 microns to eliminate contamination and

moisture in the system.

Table 1—Accessory Usage

Accessory

REQUIRED FOR LOW---AMBI-

ENT APPLICATIONS

(Below 55 °F)

REQUIRED FOR LONG LINE

APPLICATIONS* (Over 80 ft.)

REQUIRED FOR SEA

COAST APPLICATIONS

(Within 2 miles)

Crankcase Heater Yes Yes No

Evaporator Freeze Thermostat Yes No No

Winter Start Control Yes No No

Accumulator No No No

Compressor Start Assist Capacitor

and Relay Yes Yes No

Motor Master®Control Yes{No No

Support Feet Recommended No Recommended

Liquid Line Solenoid Valve Yes See Long---Line Application

Guideline No

Ball Bearing Fan Motor Yes}No No

* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft. Total Equivalent Length), refer to the Long Line Guidelines for Air

Conditioners and Heat Pumps using R---22.

{Required for low---ambient controller (full modulation feature) and Motor Mastercontrol only.

223A / 224A

Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)

UNIT SIZE LIQUID VAPOR (up to 80 ft.)

Connection Diameter Tube Diameter Connection Diameter Rated Tube Diameter

018, 024 3/8 3/8 5/8 5/8

030, 036 3/8 3/8 3/4 3/4

042, 048 3/8 3/8 7/8 7/8

060 3/8 3/8 7/8 1--1/8

Notes:

1. Tube diameters are for total equivalent lengths up to 80 ft..

2. Do not apply capillary tube or fixed orifice indoor coils to these units.

* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft.Total Equivalent Length), refer to the Longline

G u id el i n e --- A ir C o n di ti o n er s a n d H ea t Pu m p s u s i n g R --- 2 2

Outdoor Unit Connected to Factory Approved Indoor Unit

These outdoor units are carefully evaluated and listed with

specific indoor coils for proper system performance.

IMPORTANT: Do not apply indoor coils which are not factory

approved to these units.

Install Adapter Tube

1. Remove plastic retainer holding outdoor piston in liquid

service valve.

2. Check outdoor piston size with matching number listed on

unit rating plate.

3. Locate plastic bag taped to unit containing adapter tube.

4. Remove Teflonwasher from bag and install on open end

of liquid service valve. (See Fig. 5.)

5. Remove adapter tube from bag and connect threaded nut

to liquid service valve. Tighten nut finger--tight and then

with wrence an additional 1/2 turn (15 ft--lb). DO NOT

OVER TIGHTEN!

Refrigerant Tubing and Sweat Connections

Connect vapor tube to fitting on outdoor unit vapor service

valves (see Table 2). Connect liquid tubing to adapter tube on

liquid service valve. Use refrigerant grade tubing.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Service valves must be wrapped in a heat--sinking

material such as a wet cloth.

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Installation of filter drier in liquid line is required.

Install Liquid Line Filter Drier Indoor

Refer to Fig. 7 and install filter drier as follows:

1. Braze 5 in. liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.

3. Braze filter drier to 5 in. long liquid tube from step 1.

4. Connect and braze liquid refrigerant tube to the filter drier.

A05227

Fig. 7 --- Liquid Line Filter Drier

Leak Testing

Leak test all joints indoors, outdoors, and refrigerant tubing.

Evacuate Refrigerant Tubing and Indoor Coil

CAUTION

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Never use the system compressor as a vacuum pump.

Refrigerant tubes and indoor coil should be evacuated using the

recommended the recommended deep vacuum method of 500

microns. The alternate triple evacuation method may be used if

the procedure outlined below is followed.

IMPORTANT: Always break a vacuum with dry nitrogen.

223A / 224A

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of

pulling a vacuum of 500 microns and a vacuum gage capable of

accurately measuring this vacuum depth. The deep vacuum

method is the most positive way of assuring a system is free of air

and liquid water. See Fig. 8.

500

MINUTES

01234567

1000

1500

LEAK IN

SYSTEM

VACUUM TIGH

TOO WET

TIGHT

DRY SYSTEM

2000

MICRONS

2500

3000

3500

4000

4500

5000

A95424

Fig. 8 --- Deep Vacuum Graph

CHECK FOR TIGHT, DRY SYSTEM 

(IF IT HOLDS DEEP VACUUM)

EVACUATE

BREAK VACUUM WITH DRY NITROGEN

WAIT

EVACUATE

CHARGE SYSTEM

BREAK VACUUM WITH DRY NITROGEN

EVACUATE

WAIT

A95425

Fig. 9 --- Triple Evacuation Method

Triple Evacuation Method

The triple evacuation method should only be used when vacuum

pump is only capable of pumping down to 28 in. of mercury

vacuum, and system does not contain any liquid water. Refer to

Fig. 9 and proceed as follows:

1. Pump system down to 28 in. of mercury and allow pump

to continue operating for an additional 15 minutes.

2. Close service valves and shut off vacuum pump.

3. Connect a nitrogen cylinder and regulator to system and

open until system pressure is 2 psig.

4. Close service valve and allow system to stand for 1 hour.

During this time, dry nitrogen will be able to diffuse

throughout the system absorbing moisture.

5. Repeat this procedure as indicated by Fig. 9. System will

then be free of any contaminants and water vapor.

Final Tubing Check

IMPORTANT: Check to be certain factory tubing on both

indoor and outdoor unit has not shifted during shipment. Ensure

tubes are not rubbing against each other or any sheet metal. Pay

close attention to feeder tubes, makings sure wire ties on feeder

tubes are secure and tight.

STEP 9 —Make Electrical Connections

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

Do not supply power to unit with compressor terminal

box cover removed.

Be sure field wiring complies with local and national fire, safety,

and electrical codes, and voltage to system is within limits shown

on unit rating plate. Contact local power company for correction

of improper voltage. See unit rating plate for recommended

circuit protection device.

NOTE: Operation of unit on improper line voltage constitutes

abuse and could affect unit reliability. See unit rating plate. Do

not install system where voltage may fluctuate above or below

permissible limits.

NOTE: Use copper wire only between disconnect switch and

unit.

NOTE: Install branch circuit disconnect of adequate size per

NEC to handle unit starting current. Locate disconnect within

sight from and readily accessible from unit, per Section 440--14

of NEC.

Route Ground and Power Wires

Remove access panel to gain access to unit wiring. Extend wires

from disconnect through power wiring hole provided and into

unit control box.

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could result in personal

injury or death.

The unit cabinet must have an uninterrupted or unbroken

ground to minimize personal injury if an electrical fault

should occur.

The ground may consist of electrical wire or metal conduit

when installed in accordance with existing electrical codes.

223A / 224A

Connect Ground and Power Wires

Connect ground wire to ground connection in control box for

safety. Connect power wiring to contactor as shown in Fig. 10.

DISCONNECT

PER N.E.C. AND/OR

LOCAL CODES

CONTACTOR

GROUND

LUG

FIELD GROUND

WIRING

FIELD POWER

WIRING

BLUE

3 PHASE ONLY

A94025

Fig. 10 --- Line Connections

A00010

Fig. 11 --- 3--Phase Monitor Control

(Applies to 3--Phase Units Only)

Table 3—3--Phase Monitor LED Indicators

LED STATUS

OFF Nocallforcompressoropera-

tion

FLASHING Reversed phase

ON Normal

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment

damage or improper operation.

Ensure compressor rotation is correct.

S3--phase scroll compresors are rotation

sensitive.

SA flash LED on phase monitor indicates

reverse rotation. (See Fig. 11 and Table 3)

This will not allow contractor to be energized.

SDisconnect power to unit and interchange 2

field--wiring leads on unit contactor.

CAUTION

Connect Control Wiring

Route 24v control wires through control wiring grommet and

connect leads to control wiring. See Thermostat Installation

Instructions for wiring specific unit combinations. (See Fig. 12.)

Use No. 18 AWG color--coded, insulated (35°C minimum) wire.

If thermostat is located more than 100 ft. from unit, as measured

along the control voltage wires, use No. 16 AWG color--coded

wire to avoid excessive voltage drop.

All wiring must be NEC Class 1 and must be separated from

incoming power leads.

Use furnace transformer, fan coil transformer, or accessory

transformer for control power, 24v/40va minimum.

NOTE: Use of available 24v accessories may exceed the

minimum 40va power requirement. Determine total transformer

loading and increase the transformer capacity or split the load

with an accessory transformer as required.

Final Wiring Check

IMPORTANT: Check factory wiring and field wire connections

to ensure terminations are secured properly. Check wire routing

to ensure wires are not in contact with tubing, sheet metal, etc.

STEP 10 —CompressorCrankcaseHeater

When equipped with a crankcase heater, furnish power to heater a

minimum of 24 hr before starting unit. To furnish power to heater

only, set thermostat to OFF and close electrical disconnect to

outdoor unit.

A crankcase heater is required if refrigerant tubing is longer than

80 ft. Refer to the Long Line Guideline--Residential Split--System

Air Conditioners and Heat Pumps.

STEP 11 —Install Electrical Accessories

Refer to the individual installation instructions packaged with kits

or accessories when installing.

223A / 224A

STEP 12 —Start--Up

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal

injury, equipment damage or improper operation.

To prevent compressor damage or personal injury,

observe the following:

SDo not overcharge system with refrigerant.

SDo not operate unit in a vacuum or at negative pressure.

SDo not disable low pressure switch in scroll compressor

applications.

SDome temperatures may be hot.

SIn 3 phase applications, incorrect phasing will cause reverse

rotation, resulting in elevated noise levels, equalized

pressures and reduced current draw. Correct by reversing

power connections L1 and L2 on contactor.

CAUTION

PERSONAL INJURY HAZARD

Failure to follow this caution may result in personal

injury.

Wear safety glasses, protective clothing, and gloves when

handling refrigerant and observe the following:

SFront seating service valves are equipped with Schrader

valves.

CAUTION

ENVIRONMENTAL HAZARD

Failure to follow this caution may result in environmental

damage.

Federal regulations require that you do not vent refrigerant to

the atmosphere. Recover during system repair or final unit

disposal.

Follow these steps to properly start up system:

1. After system is evacuated, fully open liquid and vapor

service valves.

2. Unit is shipped with valve stem(s) closed and caps

installed. Replace stem caps after system is opened to

refrigerant flow (back seated). Replace caps finger--tight

and tighten with wrench an additional 1/12 turn.

3. Close electrical disconnects to energize system.

4. Set room thermostat at desired temperature. Be sure set

point is below indoor ambient temperature.

5. Set room thermostat to HEAT or COOL and fan control to

ON or AUTO mode, as desired. Operate unit for 15

minutes. Check system refrigerant charge.

CAUTION

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this caution may result in minor personal

injury, equipment damage or improper operation.

To prevent compressor damage or personal injury,

observe the following:

SDo not overcharge system with refrigerant.

SDo not operate unit in a vacuum or at negative pressure.

SDo not disable low pressure switch in scroll compressor

applications.

SDome temperatures may be hot.

SIn 3 phase applications, incorrect phasing will cause reverse

rotation, resulting in elevated noise levels, equalized

pressures and reduced current draw. Correct by reversing

power connection L1 and L2 on contactor.

223A / 224A

24 VAC HOT R

RVS COOLING

HP THERMOSTAT

TYPICAL

FAN COIL

HEAT

PUMP

24 VAC COM

HEAT STAGE 2

COOL/HEAT

STAGE 1

INDOOR FAN

EMERGENCY

HEAT

IF AVAILABLE

LEGEND

24-V FACTORY WIRING

24-V FIELD WIRING

FIELD SPLICE CONNECTION

OUTDOOR THERMOSTAT

EMERGENCY HEAT RELAY

SUPPLEMENTAL HEAT RELAY

SHR

EHR

ODT

A02325 / A97413

Fig. 12 --- Generic Wiring Diagrams

(See Thermostat Installation Instructions for specific unit combinations)

OF2

HK32EA003

OF1

QUIET

SHIFT

120

INTERVAL TIMER OFF

DFT

O R W2Y C

T2 C C O

DFT

T1 Y P1 J1

SPEEDUP

Speedup

Pins

Defrost interval

DIP switches

Quiet

Shift

A05378

Fig. 13 --- Defrost Control

223A / 224A

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