Friedrich R-410A User Manual

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Service Manual

2 0 11

Hazardous Duty

Room Air Conditioner

R-410AModels

Cool Only

SH15M30*

SH20M30*

HG-ServMan(1-11)

*Last character may vary.

Table Of Contents

 

Important Safety Information .....................................................................................................................

2-4

Introduction ...................................................................................................................................................

4

Unit Identifi cation ..........................................................................................................................................

5

Hazardgard Application ................................................................................................................................

6

Performance Specifi cations and Installation Data ........................................................................................

7

Electrical Data ..............................................................................................................................................

8

Hazardgard Special Features ......................................................................................................................

9

Component Defi nitions ...............................................................................................................................

10

Component Testing ................................................................................................................................

11-12

R-410ASealed System Repair Considerations ..........................................................................................

13

Sealed Refrigeration System Repairs ...................................................................................................

14-17

Refrigerant Charging .............................................................................................................................

14-17

Compressor Checks ..............................................................................................................................

18-19

Compressor Replacement .....................................................................................................................

19-20

Routine Maintenance .............................................................................................................................

21-22

Performance Test Data Sheet .....................................................................................................................

23

Troubleshooting .....................................................................................................................................

24-26

Wiring Diagram and Schematic ..................................................................................................................

27

Warranty .....................................................................................................................................................

28

Technical Assistance ...................................................................................................................................

29

1

IMPORTANT SAFETY INFORMATION

The information contained in this manual is intended for use by a qualifi ed service technician who is familiar with the safety procedures required for installation and repair, and who is equipped with the proper tools and test instruments required to service this product.

Installation or repairs made by unqualifi ed persons can result in subjecting the unqualifi ed person making such repairs as well as the persons being served by the equipment to hazards resulting in injury or electrical shock which can be serious or even fatal.

Safety warnings have been placed throughout this manual to alert you to potential hazards that may be encountered. If you install or perform service on equipment, it is your responsibility to read and obey these warnings to guard against any bodily injury or property damage which may result to you or others.

Your safety and the safety of others are very important.

We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages.

This is a safety Alert symbol.

This symbol alerts you to potential hazards that can kill or hurt you and others.

All safety messages will follow the safety alert symbol with the word “WARNING” or “CAUTION”. These words mean:

WARNING

CAUTION

You can be killed or seriously injured if you do not follow instructions.

You can receive minor or moderate injury if you do not follow instructions.

All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you what will happen if the instructions are not followed.

A message to alert you of potential property damage will have the NOTICE word “NOTICE”. Potential property damage can occur if instructions

are not followed.

PERSONAL INJURY OR DEATH HAZARDS

ELECTRICAL HAZARDS:

Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenance, or service.

Make sure to follow proper lockout/tag out procedures.

Always work in the company of a qualifi ed assistant if possible.

Capacitors, even when disconnected from the electrical power source, retain an electrical charge potential capable of causing electric shock or electrocution.

Handle, discharge, and test capacitors according to safe, established, standards, and approved procedures.

Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary to test or troubleshoot equipment with the power on to the unit.

2

Do not spray or pour water on the return air grille, discharge air grille, evaporator coil, control panel, and sleeve on the room side of the air conditioning unit while cleaning.

Electrical component malfunction caused by water could result in electric shock or other electrically unsafe conditions when the power is restored and the unit is turned on, even after the exterior is dry.

Never operate the A/C unit with wet hands.

Use air conditioner on a single dedicated circuit within the specifi ed amperage rating.

Use on a properly grounded circuit only.

Do not use extension cords with the unit.

Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, goggles, clothing, adequately insulated tools, and testing equipment etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

REFRIGERATION SYSTEM HAZARDS:

Use approved standard refrigerant recovering procedures and equipment to relieve pressure before opening system for repair.

Do not allow liquid refrigerant to contact skin. Direct contact with liquid refrigerant can result in minor to moderate injury.

Be extremely careful when using an oxy-acetylenetorch. Direct contact with the torch’s fl ame or hot surfaces can cause serious burns.

Make sure to protect personal and surrounding property with fi re proof materials.

Have a fi re extinguisher at hand while using a torch.

Provide adequate ventilation to vent off toxic fumes, and work with a qualifi ed assistant whenever possible.

Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks, fl ushing etc.

Make sure to follow all safety precautions and to use proper protective safety aids such as: gloves, safety glasses, clothing etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

MECHANICAL HAZARDS:

Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting, handling, or working around unit with moving and/or rotating parts.

Be careful when, handling and working around exposed edges and corners of sleeve, chassis, and other unit components especially the sharp fi ns of the indoor and outdoor coils.

Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.

Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.

3

PROPERTY DAMAGE HAZARDS

FIRE DAMAGE HAZARDS:

Read the Installation/Operation Manual for this air conditioning unit prior to operating.

Use air conditioner on a single dedicated circuit within the specifi ed amperage rating.

Connect to a properly grounded circuit only.

Do not use extension cords with the unit.

Failure to follow these instructions can result in fi re and minor to serious property damage.

WATER DAMAGE HAZARDS:

Improper installation maintenance, or servicing of the air conditioner unit, or not following the above Safety Warnings can result in water damage to personal items or property.

Insure that the unit has a suffi cient pitch to the outside to allow water to drain from the unit.

Do not drill holes in the bottom of the drain pan or the underside of the unit.

Failure to follow these instructions can result in result in damage to the unit and/or minor to serious property damage.

INTRODUCTION

This service manual is designed to be used in conjunction with the operation and installation manual provided with each unit.

This service manual was written to assist the professional HVAC service technician to quickly and accurately diagnose and repair any malfunctions of this product.

This manual, therefore, will deal with all subjects in a general nature. (i.e. All text will pertain to all models).

IMPORTANT: It will be necessary for you to accurately identify the unit you are servicing, so you can be certain of a proper diagnosis and repair. (See Unit Identifi cation.)

Bypass Valve

 

Capillary Tubes

Condenser

Air Discharge

 

Compressor

 

 

Condenser/Fan Blade

Fan Blade

Shroud

Electrical

Condenser Coil

Compartment

 

 

Condenser

 

Shroud Brace

On/Off Switch

Fan/Blower

 

Thermostat

Motor

 

 

Condenser

Air Intake

Air Intake

 

Indoor Blower

Air Discharge

Wheel

Front Cover

Sleeve

 

 

Air Discharge

 

Vents

4

UNIT IDENTIFICATION

Model Number Code

S H 15 M 3 0 A - A

1st Digit – Function

S = Straight Cool, Value Series

H = HazardGard

3rd and 4th Digit - Approximate BTU/HR (Cooling)

Heating BTU/Hr capacity listed in the Specifi cation/Performance Data Section

9th Digit – Engineering Suffi x

Indicates Modifi cation

(Subject to change)

8th Digit – Marketing Suffi x

Indicates Modifi cation

(Subject to change)

7th Digit – Options

0 = Straight Cool &

6th Digit – Voltage

3 = 230-208Volts

5th Digit - Model Series/Year Introduced

M=2010

RAC Serial Number Identifi cation Guide

Serial Number

 

A

A

A

R

00001

Decade Manufactured

 

 

 

 

 

L=0

C=3

F=6

J=9

 

 

 

Production Run Number

A=1

D=4

G=7

 

 

 

 

 

B=2

E=5

H=8

 

 

 

 

 

 

 

 

 

 

 

Year Manufactured

 

 

 

 

Product Line

A=1

D=4

G=7

K=0

 

 

 

R = RAC

B=2

E=5

H=8

 

 

 

 

 

C=3

F=6

J=9

 

 

 

 

 

 

 

 

 

 

 

Month Manufactured

 

 

 

 

 

A=Jan D=Apr G=Jul K=Oct

 

 

 

 

B=Feb E=May H=Aug L=Nov

 

 

 

 

C=Mar F=Jun J=Sept M=Dec

 

 

 

 

 

 

 

 

 

 

 

 

5

HAZARDGARD APPLICATION

UL Listed for use in Class I, Division 2, Groups A, B, C and D hazardous locations.

Hazardgard is speci•cally designed to cool living quarters, storage areas and other enclosures situated in hazardous locations, where speci•c volatile €ammable liquids or gases are handled or used within enclosed containers or systems.

For more than 30 years, the Friedrich Hazardgard has endured some of the toughest and most unforgiving operating conditions imaginable. Time-testedin the •eld where it counts, Hazardgard is trusted by professionals who have to get the job done. Robust engineering with design details like 33% thicker

•ns extend the life of the coil. Diamonblue Technology, ouranti-corrosivetreatment,provides added endurance and protection in coastal or corrosive environments.

Ideal applications

O!shore oil rigs, on-shoreoil company of•ces and re•neries

Petrochemical sites and propane •ll-upstations

Paint and varnish storage or processing plants

Grain alcohol processors or storage sites

Plant areas using strong solvents or chemicals

Munitions plants or armories

PVC or plastics plants and processing points

Recycling plants

Furniture re•nishing/stripping workshops

Fertilizer plants

Of•ce complexes where methane is a by-product

Hazardous materials storage

| HAZARDOUS DUTY|

6

SPECIFICATIONS AND PERFORMANCE DATA

 

Cooling Performance Data

*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EVAPORATOR AIR

 

 

 

 

OPERATING

 

ELECTRICAL RATINGS

 

R-410AREF.

 

BREAKER

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMP. DEG. F

CONDENSER

 

 

 

 

PRESSURES

 

 

 

FUSE

 

 

 

 

Discharge

Suction

Super

Sub-

 

 

 

 

 

 

 

 

 

 

 

Discharge

 

TEMPERATURE

Temp

Temp

Heat

Cooling

 

 

 

 

 

Locked Rotor

 

 

Voltage

60 Hertz

 

 

 

 

Temp. Drop F.

DEG. F

Suction

Discharge

 

Amps Cool

Amps Heat

 

Charge in OZ.

 

 

 

 

 

Air

 

 

 

 

 

 

 

 

 

 

 

Amps

 

 

 

Amps

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SH15M30*

 

54

26

127

186

67

18

35

137

480

6.9

-

43

50

208 / 230

15

 

 

 

54

26

185

124

68

15

38

137

485

9.1

-

43

42.7

208 / 230

15

 

 

SH15M30*

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

* Due to continuing research in newenergy-savingtechnology, performance data and 8th and 9th character are subject to change without notice.

Speci•cations

 

 

 

 

 

 

 

 

 

 

Energy

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Efficiency

Moisture

Air Direction

Room Side Air

 

Cooling Capacity

 

Electrical Characteristics (60 Hertz)

 

Ratio AHAM

Removal

Controls

Circulation

Model

(BTU/Hr.- AHAM)

Volts Rated

Amps AHAM

Watts

 

 

EER

(Pints/ Hr.)

 

 

 

CFM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SH15M30*

14500/14000

 

230/208

 

6.9/7.4

1495/1443

 

9.7/9.7

 

6.0

8-way

 

 

375

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SH20M30*

19500/19000

 

230/208

 

9.1/10.0

2074/2021

 

9.4/9.4

 

4.0

8-way

 

 

375

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Installation Information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circuit Rating

 

 

 

 

 

 

Dimensions

 

 

 

Window Width

Thru-The-Wall

Breaker or

Weight

 

 

 

 

 

 

 

 

 

 

 

 

(Inches)

 

 

 

 

 

 

 

 

 

 

 

 

(Inches)

Finished Hole (Inches)

T - D Fuse

 

(Lbs.)

 

 

 

 

 

 

 

 

 

 

 

 

Depth

Depth J Box

Minimum

Minimum

 

 

 

 

 

 

 

 

 

 

 

 

Overall

to Louvers

Extension

Extension

 

 

 

 

 

 

 

 

 

Model

Height

Width

 

 

 

Into Room

Outside

Min.

Max .

Height

Width

Max. Depth

Volts - Amps

Net

Shipping

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SH15M30*

15 15/16

25 15/16

27 3/8

6

 

3 1/16

16 15/16

27 7/8

42

16 3/16

26 3/16

6

250V

- 15A

156

168

SH20M30*

17 15/16

25 15/16

27 3/8

6

 

3 1/16

16 15/16

27 7/8

42

18 3/16

26 3/16

6

250V

- 15A

160

174

Due to continuing engineering research and technology, spec ¿cations are subject to change without notice. Manufactured under U.S. Design Patent DES 368, 306 decorative front; Utility Patent 5, 622, 058. MAXIMUM outdoor ambient operating temperature is 130°F. MAXIMUM TEMPERATURE RATING FOR CLASS I, DIVISION 2, GROUPS A,B,C,D.

OPERATING TEMPERATURE CODE T3B

Max.

Wall

Depth

S TAN DARD ON A LL M ODE L S

This advanced corrosion protection treatment protects the outdoor coil against deterioration and extends the life of the unit especially in harsh coastal environments.

SIDE VIEW

Junction

Box

Front

7

7

ELECTRICAL DATA

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation.

All electrical connections and wiring MUST be installed by a qualifi ed electrician and conform to the National Electrical Code and all local codes which have jurisdiction.

Failure to do so can result in personal injury or death.

NOTICE

FIRE HAZARD

Not following the above WARNING could result in fi re or electrically unsafe conditions which could cause moderate or serious property damage.

Read, understand and follow the above warning.

ELECTRICAL REQUIREMENTS

ALL FIELD WIRING MUST MEET THE REQUIREMENTS OF THE NATIONAL ELECTRICAL CODE (ANSI/NFPA 70) ARTICLE 501.

THE FIELD-PROVIDEDCIRCUIT PROTECTION DEVICE (HACR CIRCUIT BREAKER OR TIME DELAY FUSE) MUST NOT EXCEED THE AMPACITY INDICATED ON THE PRODUCT NAMEPLATE.

IMPORTANT: Before you begin the actual installation of your air conditioner, check local electrical codes and the information below.

Your air conditioner must be connected to a power supply with the same A.C. voltage and frequency (hertz) as marked on the data plate located on the chassis. Only alternating current (A.C.), no direct current (D.C.), can be used.

An overloaded circuit will invariably cause malfunction or failure of the air conditioner therefore, it is extremely important that the electrical power is adequate. Consult your power company if in doubt.

Model Number

Connection Type

Circuit Rating

Time Delay Fuse

 

 

 

 

 

SH15

Junction Box

250V-15Amp

 

 

 

SH20

Junction Box

250V-15Amp

 

 

 

8

HAZARDGARD SPECIAL FEATURES

Permanent Split-Capacitor,totally enclosed fan motor to assure effi cient operation even under adverse electrical conditions. Motor has a special stainless steel shaft to resist corrosion and a hermetically sealed overload forarc-freeoperation.

High capacity compressor with internal hermetically sealed overload.

Solid-staterelay contains transient voltage suppressor to protect controls against transient voltage spikes.

Provides solid state switches for arc-freeoperation.

Hot gas bypass low ambient control to permit operation without freezing at outdoor ambient temperatures as low as 45°F (7°C).

Environmentally sealed on-offswitch and gold plated contacts in thermostat for corrosion resistance.

Electrodeposited epoxy primer and alkyd enamel, both oven-bakedfor an attractive,long-lastingfi nish.

Copper tubing/aluminum fi n coils.

Galvanized steel cabinet and base pan, all bonderized.

Slide-outchassis for easy installation in window orthrough–the–wall.

Extra insulation inside, including completely insulated plenum chamber for quieter, more effi cient cooling.

Entire unit test run in environmental chamber before crating.

Eight–wayair fl ow control for uniform air circulation.

Condensate drain with exclusive mosquito trap.

15 amp circuit with time-delayfuse required. Accommodates direct wiring.

Long lasting 3/8” (10mm) thick air fi lter, germicidally treated, easily removed for cleaning.

Friedrich Air Conditioning quality has been proven by more than 25 years of successful experience from the Gulf of Mexico to the searing sands of the Arabian desert.

Control Panel

Function Control (Power)

This switch is a double pole, single throw toggle switch. ON - Turns everything on.

(Fan motor runs continuously)

OFF - Turns everything off.

Temperature Control

The knob at the bottom is the thermostat which is a cross ambient type used to maintain the desired comfort level.

The thermostat reacts only to a change in temperature at the bulb location - turn the knob clockwise to set cooler, counterclockwise for warmer.

Exclusive

Friedrich leads with the fi rst UL Listed Room Air Conditioners designed to cool living quarters and other enclosures situated in hazardous locations where specifi c volatile fl ammable liquids or gases are handled or used with enclosed containers or systems. Friedrich Hazardgard room air conditioners are designed to meet the National

Electrical Code, Article 500 requirements for Class I, Division 2, Groups A, B, C, D Hazardous locations, and are the only air conditioners UL Listed for this application. THIS UNIT IS LISTED BY UNDERWRITERS

LABORATORIES FOR USE IN CLASS I, DIVISION

2,GROUPS A, B, C, D HAZARDOUS LOCATIONS. Operating Temperature Code: T3B.

9

COMPONENT DEFINITIONS

A. Mechanical components

Plenum assembly

Diffuser with directional louvers used to direct the conditioned airfl ow.

Blower wheel

Attaches to the indoor side of the fan motor shaft and is used for distributing unconditioned, room side air through the heat exchanger and delivering conditioned air into the room.

Slinger fan blade

Attaches to the outdoor side of the fan motor shaft and is used to move outside air through the condenser coil, while slinging condensate water out of the base pan and onto the condenser coil, thus lowering the temperature and pressures within the coil.

B. Electrical components

Thermostat Control

Used to maintain the specifi ed room side comfort level.

System Switch

Used to regulate the operation of the fan motor and the compressor or to turn the unit off. For troubleshooting, refer to the wiring diagrams and schematics in the back of this service manual.

Solid State Relay

Used to energize the compressor and fan motor. Each unit has 2, 50 amp, 208/230 volt relays.

Capacitor

Reduces line current and steadies the voltage supply, while greatly improving the torque characteristics of the fan motor and compressor motor.

Fan Motor

Dual shafted fan motor operates the indoor blower wheel and the condenser fan blade simultaneously. (When unit is turned on, the fan motor runs continuously).

C. Hermetic components

Compressor

Motorized device used to compress refrigerant through the sealed system.

Low ambient bypass (hot gas bypass) valve

Used for low ambient cooling operation, the valve is connected between the discharge line at the compressor and the suction process tube. It responds to suction pressure, whcih when reduced in the system, causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system. The valve is preset to open when the suction pressure reaches 88 psig.

Capillary tube

A cylindrical metering device used to evenly distribute the fl ow of refrigerant to the heat exchanger (evaporator coils).

10

COMPONENT TESTING

FAN MOTOR

A 230 volt single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan. A running capacitor is wired across the start and run terminals of the motor.

The motor is totally enclosed and is protected with a line voltage overload located internally of the motor. The motor shaft is stainless steel to resist corrosion. When the unit is turned on, the motor runs continuously.

FAN MOTOR

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

FAN MOTOR – TEST

1.Determine that the capacitor is good.

2.Perform continuity test on windings to determine if open, shorted or okay.

SOLID STATE RELAY

Two 50 amp rated 208/230 volt solid state relays are used to energize the compressor and fan motor. Terminals 3 and 4 are the 208/230 volt line side. Terminals 1 and 2 are load side contacts.

Line side

SOLID STATE

RELAY

Load

side

LED indicates contacts closed when lit

SYSTEM CONTROL SWITCH

This switch is double pole, single throw. Check for continuity between terminals 2 and 3, and 5 and 6.

SWITCH, ON-OFF

CAPACITORS

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before servicing. Discharge capacitor with a 20,000 Ohm 2 Watt resistor before handling.

Failure to do so may result in personal injury, or death.

Many motor capacitors are internally fused. Shorting the terminals will blow the fuse, ruining the capacitor. A 20,000 ohm 2 watt resistor can be used to discharge capacitors safely. Remove wires from capacitor and place resistor across terminals. When checking a dual capacitor with a capacitor analyzer or ohmmeter, both sides must be tested.

Capacitor Check with Capacitor Analyzer

The capacitor analyzer will show whether the capacitor is “open” or “shorted.” It will tell whether the capacitor is within its micro farads rating and it will show whether the capacitor is operating at the proper power-factorpercentage. The instrument will automatically discharge the capacitor when the test switch is released.

Capacitor Connections

The starting winding of a motor can be damaged by a shorted and grounded running capacitor. This damage usually can be avoided by proper connection of the running capacitor terminals.

From the supply line on a typical 230 volt circuit, a 115 volt potential exists from the “R” terminal to ground through a possible short in the capacitor. However, from the “S” or start terminal, a much higher potential, possibly as high as 400 volts, exists because of the counter EMF generated in the start winding. Therefore, the possibility of capacitor failure is much greater when the identifi ed terminal is connected to the “S” or start terminal. The identifi ed terminal should always be connected to the supply line, or “R” terminal, never to the “S” terminal.

When connected properly, a shorted or grounded running capacitor will result in a direct short to ground from the “R” terminal and will blow the line fuse. The motor protector will protect the main winding from excessive temperature.

11

THERMOSTAT

A cross ambient thermostat is used to maintain the desired comfort level. The thermostat reacts only to a change in temperature at the bulb location. Important to the successful operation of the unit is the position of the sensing bulb in relation to the evaporator.

SENSING

BULB LOCATION

RANGE: Thermostat

(Part No. 618-225-02)60° F ( ± 2° ) to 90° F( ± 4° )

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

TESTING THE THERMOSTAT

Remove the wires from the thermostat. Turn the thermostat to its coldest position. Check to see if there is continuity between the two terminals. Turn the thermostat to its warmest position. Check continuity to see if the thermostat contacts open.

Note: The temperature must be within the range listed to check the thermostat. Refer to the troubleshooting section in this manual for additional information on thermostat testing.

LOW AMBIENT BYPASS VALVE

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant and oil under high pressure.

Propersafetyproceduresmustbefollowed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

The Hazardgard unit is designed to operate at low outside ambient temperatures. This is accomplished by the use of a bypass valve installed in the refrigeration circuit.

The valve is connected between the discharge line at the compressor and the suction process tube. The valve responds to suction pressure which, when reduced in the system, causes the valve to open and bypass hot gas from the high pressure side to the low pressure side of the system. The hot gas entering the compressor mixes with the cool gas returned through the suction line, thus increasing the suction pressure. The valve is preset to open when the suction pressure reaches 88 psig. This pressure setting cannot be altered. The system can be operated at outdoor temperatures as low as 45°F before the evaporator coil will begin to accumulate frost.

To determine if the valve operates, block the return air to the evaporator coil. Turn on the unit and touch the tube at the bypass valve outlet which connects to the suction process tube. When the low side pressure reaches approximately 88 psig, the valve will begin to open and the tube will get hot. This method will determine if the valve is responding to the suction pressure change.

LOW AMBIENT

BYPASS VALVE

12

R-410ASEALED SYSTEM REPAIR CONSIDERATIONS

WARNING

Refrigeration system under high pressure

Do not puncture, heat, expose to fl ame or incinerate.

Only certifi ed refrigeration technicians should service this equipment.

R410Asystems operate at higher pressures than R22 equipment.Appropriate safe service and handling practicces must be used.

Only use gauge sets designed for use with R410A.

Do not use standard R22 gauge sets.

The following is a list of important considerations when working with R-410Aequipment

R-410Apressure is approximately 60% higher thanR-22pressure.

R-410Acylinders must not be allowed to exceed 125 F, they may leak or rupture.

R-410Amust never be pressurized with a mixture of air, it may become

ammable.

Servicing equipment and components must be specifi cally designed for use with R-410Aand dedicated to prevent contamination.

Manifold sets must be equipped with gauges capable of reading 750 psig (high side) and 200 psig (low side), with a 500-psiglow-sideretard.

Gauge hoses must have a minimum 750-psigservice pressure rating

Recovery cylinders must have a minimum service pressure rating of 400 psig, (DOT 4BA400 and DOT BW400 approved cylinders).

POE (Polyol-Ester)lubricants must be used withR-410Aequipment.

To prevent moisture absorption and lubricant contamination, do not leave the refrigeration system open to the atmosphere longer than 1 hour.

Weigh-inthe refrigerant charge into the high side of the system.

Introduce liquid refrigerant charge into the high side of the system.

For low side pressure charging of R-410A,use a charging adaptor.

Use Friedrich approved R-410Afi lter dryers only.

13

R-410ASEALED REFRIGERATION SYSTEM REPAIRS

IMPORTANT

SEALED SYSTEM REPAIRS TO COOL-ONLYMODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER.

EQUIPMENT REQUIRED:

1.Voltmeter

2.Ammeter

3.Ohmmeter

4.E.P.A. Approved Refrigerant Recovery System

5.Vacuum Pump (capable of 200 microns or less vacuum.)

6.Acetylene Welder

7.Electronic Halogen Leak Detector capable of detecting HFC (Hydrofl uorocarbon) refrigerants.

8.Accurate refrigerant charge measuring device such as:

a.Balance Scales - 1/2 oz. accuracy

b.Charging Board - 1/2 oz. accuracy

9.High Pressure Gauge - (0 to 750 lbs.)

10.Low Pressure Gauge - (-30to 200 lbs.)

11.Vacuum Gauge - (0 - 1000 microns)

12.Facilities for fl owing nitrogen through refrigeration tubing during all brazing processes.

EQUIPMENT MUST BE CAPABLE OF:

1.Recovering refrigerant to EPA required levels.

2.Evacuation from both the high side and low side of the system simultaneously.

3.Introducing refrigerant charge into high side of the system.

4.Accurately weighing the refrigerant charge introduced into the system.

WARNING

RISK OF ELECTRIC SHOCK

Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenances or service.

Failure to do so could result in electric shock, serious injury or death.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

Refrigerant Charging

NOTE: Because the Hazardgard refrigeration system is sealed, service process tubes will have to be installed. First install a line tap and remove refrigerant from the system. Make necessary sealed system repairs and vacuum system. Crimp process tube line and solder end shut. Do not leave a service valve in the sealed system.

Proper refrigerant charge is essential to proper unit operation. Operating a unit with an improper refrigerant charge will result in reduced performance (capacity) and/or effi ciency. Accordingly, the use of proper charging methods during servicing will insure that the unit is functioning as designed and that its compressor will not be damaged.

Too much refrigerant (overcharge) in the system is just as bad (if not worse) than not enough refrigerant (undercharge). They both can be the source of certain compressor failures if they remain uncorrected for any period of time. Quite often, other problems (such as low air fl ow across evaporator, etc.) are misdiagnosed as refrigerant charge problems. The refrigerant circuit diagnosis chart will assist you in properly diagnosing these systems.

An overcharged unit will at times return liquid refrigerant (slugging) back to the suction side of the compressor eventually causing a mechanical failure within the compressor. This mechanical failure can manifest itself as valve failure, bearing failure, and/or other mechanical failure. The specifi c type of failure will be infl uenced by the amount of liquid being returned, and the length of time the slugging continues.

Not enough refrigerant (undercharge) on the other hand, will cause the temperature of the suction gas to increase to the point where it does not provide suffi cient cooling for the compressor motor. When this occurs, the motor winding temperature will increase causing the motor to overheat and possibly cycle open the compressor overload protector. Continued overheating of the motor windings and/or cycling of the overload will eventually lead to compressor motor or overload failure.

14

Method Of Charging / Repairs

The acceptable method for charging the Hazardgard system is the Weighed in Charge Method. The weighed in charge method is applicable to all units. It is the preferred method to use, as it is the most accurate.

The weighed in method should always be used whenever a charge is removed from a unit such as for a leak repair, compressor replacement, or when there is no refrigerant charge left in the unit. To charge by this method, requires the following steps:

1.Install a piercing valve to remove refrigerant from the sealedsystem. (Piercing valve must be removed from the system before recharging.)

2.Recover Refrigerant in accordance with EPA regulations.

WARNING

BURN HAZARD

Proper safety procedures must be followed, and proper protective clothing must be worn when working with a torch.

Failure to follow these procedures could result in moderate or serious injury.

3. Install a process tube to sealed system.

CAUTION

FREEZE HAZARD

Proper safety procedures must be followed, and proper protective clothing must be worn when working with liquid refrigerant.

Failure to follow these procedures could result in minor to moderate injury.

4.Make necessary repairs to system.

5.Evacuate system to 200 microns or less.

6.Weigh in refrigerant with the proper quantity of R-410Arefrigerant.

7.Start unit, and verify performance.

WARNING

BURN HAZARD

Proper safety procedures must be followed, and proper protective clothing must be worn when working with a torch.

Failure to follow these procedures could result in moderate or serious injury.

8. Crimp the process tube and solder the end shut.

15

 

WARNING

 

 

WARNING

 

 

ELECTRIC SHOCK HAZARD

 

 

HIGH PRESSURE HAZARD

 

 

 

 

 

 

 

Turn off electric power before service or

 

 

SealedRefrigerationSystemcontainsrefrigerant

 

 

installation.

 

 

and oil under high pressure.

 

 

Extreme care must be used, if it becomes

 

 

Proper safety procedures must be followed,

 

 

necessary to work on equipment with power

 

 

and proper protective clothing must be worn

 

 

applied.

 

 

when working with refrigerants.

 

 

Failure to do so could result in serious injury or

 

 

Failure to follow these procedures could

 

 

death.

 

 

result in serious injury or death.

 

 

 

 

 

 

 

Undercharged Refrigerant Systems

 

A check of the amperage drawn by the compressor

 

 

 

An undercharged system will result in poor performance

 

motor should show a lower reading. (Check the Unit

(low pressures, etc.) in both the heating and cooling

 

Specifi cation.) After the unit has run 10 to 15 minutes,

cycle.

 

check the gauge pressures. Gauges connected to system

 

 

 

with an undercharge will have low head pressures and

Whenever you service a unit with an undercharge of

refrigerant, always suspect a leak. The leak must be repaired before charging the unit.

substantially low suction pressures.

To check for an undercharged system, turn the unit on, allow the compressor to run long enough to establish working pressures in the system (15 to 20 minutes).

During the cooling cycle you can listen carefully at the exit of the metering device into the evaporator; an intermittent hissing and gurgling sound indicates a low refrigerant charge. Intermittent frosting and thawing of the evaporator is another indication of a low charge, however, frosting and thawing can also be caused by insuffi cient air over the evaporator.

Checks for an undercharged system can be made at the compressor. If the compressor seems quieter than normal, it is an indication of a low refrigerant charge.

Overcharged Refrigerant Systems

of the evaporator will not be encountered because the

 

refrigerant will boil later if at all. Gauges connected to

Compressor amps will be near normal or higher.

system will usually have higher head pressure (depending

Noncondensables can also cause these symptoms. To

upon amount of over charge). Suction pressure should be

confi rm, remove some of the charge, if conditions improve,

slightly higher.

system may be overcharged. If conditions don’t improve,

 

 

 

Noncondensables are indicated.

 

 

 

Whenever an overcharged system is indicated, always

 

 

 

make sure that the problem is not caused by air fl ow

 

 

 

problems. Improper air fl ow over the evaporator coil may

 

 

 

indicate some of the same symptoms as an over charged

 

 

 

system.

 

 

 

An overcharge can cause the compressor to fail, since it

 

 

 

would be “slugged” with liquid refrigerant.

 

 

 

The charge for any system is critical. When the compressor

 

 

 

is noisy, suspect an overcharge, when you are sure that

 

 

 

the air quantity over the evaporator coil is correct. Icing

 

 

 

 

 

 

 

16

Restricted Refrigerant System

Troubleshooting a restricted refrigerant system can be diffi cult. The following procedures are the more common problems and solutions to these problems. There are two types of refrigerant restrictions: Partial restrictions and complete restrictions.

A partial restriction allows some of the refrigerant to circulate through the system.

With a complete restriction there is no circulation of refrigerant in the system.

Restricted refrigerant systems display the same symptoms as a “low-chargecondition.”

When the unit is shut off, the gauges may equalize very slowly.

Gauges connected to a completely restricted system will run in a deep vacuum. When the unit is shut off, the gauges will not equalize at all.

A quick check for either condition begins at the evaporator.

With a partial restriction, there may be gurgling sounds

at the metering device entrance to the evaporator. The evaporator in a partial restriction could be partially frosted or have an ice ball close to the entrance of the metering device. Frost may continue on the suction line back to the compressor.

Often a partial restriction of any type can be found by feel, as there is a temperature difference from one side of the restriction to the other.

With a complete restriction, there will be no sound at the metering device entrance. An amperage check of the compressor with a partial restriction may show normal current when compared to the unit specifi cation. With a complete restriction the current drawn may be considerably less than normal, as the compressor is running in a deep vacuum (no load.) Much of the area of the condenser will be relatively cool since most or all of the liquid refrigerant will be stored there.

The following conditions are based primarily on a system in the cooling mode.

17

COMPRESSOR CHECKS

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

Locked Rotor Voltage (L.R.V.) Test

Locked rotor voltage (L.R.V.) is the actual voltage available at the compressor under a stalled condition.

Single Phase Connections

Disconnect power from unit. Using a voltmeter, attach one lead of the meter to the run “R” terminal on the compressor and the other lead to the common “C” terminal of the compressor. Restore power to unit.

Determine L.R.V.

Start the compressor with the volt meter attached; then stop the unit. Attempt to restart the compressor within a couple of seconds and immediately read the voltage on the meter. The compressor under these conditions will not start and will usually kick out on overload within a few seconds since the pressures in the system will not have had time to equalize. Voltage should be at or above minimum voltage of 197 VAC, as specifi ed on the rating plate. If less than minimum, check for cause of inadequate power supply; i.e., incorrect wire size, loose electrical connections, etc.

Amperage (L.R.A.) Test

The running amperage of the compressor is the most important of these readings. A running amperage higher than that indicated in the performance data indicates that a problem exists mechanically or electrically.

Single Phase Running and L.R.A. Test

NOTE: Consult the specifi cation and performance section for running amperage. The L.R.A. can also be found on the rating plate.

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation. Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

Select the proper amperage scale and clamp the meter probe around the wire to the “C” terminal of the compressor.

Turn on the unit and read the running amperage on the meter. If the compressor does not start, the reading will indicate the locked rotor amperage (L.R.A.).

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing. Failure to follow this warning could result in serious injury or death.

INTERNAL OVERLOAD

The compressors are equipped with an internal overload.

The overload is embedded in the motor windings to sense the winding temperature and/or current draw. The overload is connected in series with the common motor terminal

Should the internal temperature and/or current draw become excessive, the contacts in the overload will open, turning off the compressor. The overload will automatically reset, but may require several hours before the heat is dissipated.

CHECKING THE INTERNAL OVERLOAD

INTERNALOVERLOAD

1.With no power to unit, remove the leads from the compressor terminals.

2.Using an ohmmeter, test continuity between terminals C-SandC-R.If no continuity, the compressor overload is open and the compressor must be replaced.

18

Single Phase Resistance Test

Remove the leads from the compressor terminals and set the ohmmeter on the lowest scale (R x 1).

Touch the leads of the ohmmeter from terminals common to start (“C” to “S”). Next, touch the leads of the ohmmeter from terminals common to run (“C” to “R”).

Add values “C” to “S” and “C” to “R” together and check resistance from start to run terminals (“S” to “R”).

Resistance “S” to “R” should equal the total of “C” to “S” and “C” to “R.”

In a single phase PSC compressor motor, the highest value will be from the start to the run connections (“S” to “R”). The next highest resistance is from the start to the common connections (“S” to “C”). The lowest resistance is from the run to common. (“C” to “R”) Before replacing a compressor, check to be sure it is defective.

Check the complete electrical system to the compressor and compressor internal electrical system, check to be certain that compressor is not out on internal overload.

Complete evaluation of the system must be made when ever you suspect the compressor is defective. If the compressor has been operating for sometime, a careful examination must be made to determine why the compressor failed.

Many compressor failures are caused by the following conditions:

1.Improper air fl ow over the evaporator.

2.Overcharged refrigerant system causing liquid to be returned to the compressor.

3.Restricted refrigerant system.

4.Lack of lubrication.

5.Liquid refrigerant returning to compressor causing oil to be washed out of bearings.

6.Noncondensables such as air and moisture in the system. Moisture is extremely destructive to a refrigerant system.

COMPRESSOR REPLACEMENT

Recommended procedure for compressor replacement

WARNING

RISK OF ELECTRIC SHOCK

Unplug and/or disconnect all electrical power to the unit before performing inspections, maintenances or service.

Failure to do so could result in electric shock, serious injury or death.

1.Be certain to perform all necessary electrical and refrigeration tests to be sure the compressor is actually defective before replacing.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

2. Recover all refrigerant from the system though the process tubes. PROPER HANDLING OF

RECOVERED REFRIGERANT ACCORDING TO

EPA REGULATIONS IS REQUIRED. Do not use gauge manifold for this purpose if there has been a burnout. You will contaminate your manifold and hoses. Use a Schrader valve adapter and copper tubing for burnout failures.

WARNING

HIGH TEMPERATURES

Extreme care, proper judgment and all safety procedures must be followed when testing, troubleshooting, handling or working around unit while in operation with high temperature components. Wear protective safety aids such as: gloves, clothing etc.

Failure to do so could result in serious burn injury.

NOTICE

FIRE HAZARD

The use of a torch requires extreme care and proper judgment. Follow all safety recommended precautions and protect surrounding areas with fi re proof materials. Have a fi re extinguisher readily available. Failure to follow this notice could result in moderate to serious property damage.

19

3.After all refrigerant has been recovered, disconnect suction and discharge lines from the compressor and remove compressor. Be certain to have both suction and discharge process tubes open to atmosphere.

4.Carefully pour a small amount of oil from the suction

stub of the defective compressor into a clean container.

5.Using an acid test kit (one shot or conventional kit), test the oil for acid content according to the instructions with the kit.

6.If any evidence of a burnout is found, no matter how slight, the system will need to be cleaned up following proper procedures.

7.Install the replacement compressor.

WARNING

EXPLOSION HAZARD

The use of nitrogen requires a pressure regulator. Follow all safety procedures and wear protective safety clothing etc.

Failure to follow proper safety procedures result in serious injury or death.

8.Pressurize with a combination of R-410Aand nitrogen and leak test all connections with an electronic or Halide leak detector. Recover refrigerant and repair any leaks found.

Repeat Step 8 to insure no more leaks are present.

9. Evacuate the system with a good vacuum pump capable of a fi nal vacuum of 200 microns or less. The system should be evacuated through both liquid line and suction line gauge ports. While the unit is being evacuated, seal all openings on the defective compressor. Compressor manufacturers will void warranties on units received not properly sealed. Do not distort the manufacturers tube connections.

CAUTION

FREEZE HAZARD

Proper safety procedures must be followed, and proper protective clothing must be worn when working with liquid refrigerant.

Failure to follow these procedures could result in minor to moderate injury.

10. Recharge the system with the correct amount of refrigerant. The proper refrigerant charge will be found on the unit rating plate. The use of an accurate measuring device, such as a charging cylinder, electronic scales or similar device is necessary.

SPECIAL PROCEDURE IN THE CASE OF MOTOR

COMPRESSOR BURNOUT

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation.

Failure to do so may result in personal injury, or death.

WARNING

HIGH PRESSURE HAZARD

SealedRefrigerationSystemcontainsrefrigerant and oil under high pressure.

Proper safety procedures must be followed, and proper protective clothing must be worn when working with refrigerants.

Failure to follow these procedures could result in serious injury or death.

WARNING

EXPLOSION HAZARD

The use of nitrogen requires a pressure regulator. Follow all safety procedures and wear protective safety clothing etc.

Failure to follow proper safety procedures result in serious injury or death.

1.Recover all refrigerant and oil from the system.

2.Remove compressor, capillary tube and fi lter drier from the system.

3.Flush evaporator condenser and all connecting tubing with dry nitrogen or equivalent. Use approved

fl ushing agent to remove all contamination from system. Inspect suction and discharge line for carbon deposits. Remove and clean if necessary.

Ensure all acid is neutralized.

4.Reassemble the system, including new drier strainer and capillary tube.

5.Proceed with step 8-10on previous section.

20

ROUTINE MAINTENANCE

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before inspections, maintenances, or service.

Extreme care must be used, if it becomes necessary to work on equipment with power applied.

Failure to do so could result in serious injury or death.

WARNING

EXCESSIVE WEIGHT HAZARD

Use two people to lift or carry the unit, and wear proper protective clothing.

Failure to do so may result in personal injury.

WARNING

CUT/SEVER HAZARD

Be careful with the sharp edges and corners.

Wear protective clothing and gloves, etc.

Failure to do so could result in serious injury.

NOTICE

Units are to be inspected and serviced by qualifi ed service personnel only. Use proper protection on surrounding property. Failure to follow this notice could result in moderate or serious property damage.

NOTICE

Do not use a caustic coil cleaning agent on coils or base pan. Use a biodegradable cleaning agent and degreaser, to prevent damage to the coil and/or base pan.

AIR FILTER

Clean the unit air intake fi lter at least every 300 to 350 hours of operation. Clean the fi lters with a mild detergent in warm water and allow to dry thoroughly before reinstalling.

COILS AND BASE PAN

The indoor coil (evaporator coil), the outdoor coil (condenser coil) and base pan should be inspected periodically

(yearly or bi-yearly)and cleaned of all debris (lint, dirt, leaves, paper, etc.). Clean the coils and base pan with a soft brush and compressed air or vacuum. If using a pressure washer, be careful not to bend the aluminium fi n pack. Use a sweeping up and down motion in the direction of the vertical aluminum fi n pack when pressure cleaning coils. Cover all electrical components to protect them from water or spray. Allow the unit to dry thoroughly before reinstalling it in the sleeve.

BLOWER WHEEL / HOUSING / CONDENSER FAN / SHROUD

Inspect the indoor blower housing, evaporator blade, condenser fan blade and condenser shroud periodically (yearly or bi-yearly)and clean of all debris (lint, dirt, mold, fungus, etc.). Clean the blower housing area and blower wheel with an antibacterial / antifungal cleaner. Use a biodegradable cleaning agent and degreaser on condenser fan and condenser shroud. Use warm or cold water when rinsing these items. Allow all items to dry thoroughly before reinstalling them.

ELECTRONIC / ELECTRICAL / MECHANICAL

Periodically (at least yearly or bi-yearly):inspect all control components: electronic, electrical and mechanical, as well as the power supply. Use proper testing instruments (voltmeter, ohmmeter, ammeter, wattmeter, etc.) to perform electrical tests. Use an air conditioning or refrigeration thermometer to check room, outdoor and coil operating temperatures. Use an electronic tester to measure wet bulb temperatures indoors and outdoors.

For performance tests use form on page 23.

21

ROUTINE MAINTENANCE (Continued)

NOTICE

Do not drill holes in the bottom of the drain pan or the underside of the unit. Not following this notice could result in damage to the unit or condensate water leaking inappropriately which could cause water damage to surrounding property.

Discharge Air Plenum

 

 

Slot

 

Tab

Slot

Return Air Grille

 

Tab

 

Latches

SLEEVE / DRAIN

Inspect the sleeve and drain system periodically (at least yearly or bi-yearly)and clean of all obstructionsLatch and

Return air grille

debris. Clean both areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and ensure that the drain outlets are operating correctly. Check the sealant around the sleeve and reseal areas as needed.

FRONT COVER

Clean the front cover when needed. Use a mild detergent. Wash and rinse with warm water. Allow it to dry thoroughly before reinstalling it in the chassis.

CLEARANCES

Inspect the surrounding area (inside and outside) to ensure that the unit’s clearances have not been compromised or altered.

Bypass Valve

 

Capillary Tubes

Condenser

Air Discharge

 

Compressor

 

 

Condenser/Fan Blade

Fan Blade

Shroud

Electrical

Condenser Coil

Compartment

 

 

Condenser

 

Shroud Brace

On/Off Switch

Fan/Blower

 

Thermostat

Motor

 

 

Condenser

Air Intake

Air Intake

 

Indoor Blower

Air Discharge

Wheel

Front Cover

Sleeve

 

 

Air Discharge

 

Vents

22

ROOM AIR CONDITIONER UNIT

PERFORMANCE TEST DATA SHEET

DATE: _______________ MODEL:_______________ SERIAL:________________

 

YES

NO

IS THERE A FRIEDRICH SLEEVE INSTALLED?

____

____

IS THERE A CHASSIS SEAL GASKET INSTALLED?

____

____

IS MAINTENANCE BEING PERFORMED?

____

____

If NO is checked use back of sheet for explanation

ELECTRICAL:

LINE VOLTAGE (STATIC) ---------

VOLTS

START UP VOLTAGE ---------

VOLTS

AMPERAGE DRAW ---------

AMPS (COOL)

AMPERAGE DRAW ---------

AMPS (HEAT)

COMPRESSOR

LOCKED ROTOR AMPS ---------

AMPS

RUNNING AMPERAGE DRAW ---------

AMPS

INDOOR TEMPERATURES:

INDOOR AMBIENT TEMPERATURE --------

F

RELATIVE HUMIDITY (RH) INDOOR --------

%

 

 

COOL

 

HEAT

DISCHARGE AIR TEMPERATURE (INDOOR)

----------

F

---------F

RETURN AIR TEMPERATURE (INDOOR)

----------

F ---------

F

DIFFERENTIAL

 

----------

F ---------

F

OUTDOOR TEMPERATURE:

 

 

 

 

OUTDOOR AMBIENT TEMPERATURE

---------

F

 

RELATIVE HUMIDITY (RH)

 

---------

%

 

CONDENSER:

 

 

 

 

DISCHARGE AIR TEMPERATURE (OUTDOOR)

---------

F ----------

F

INTAKE AIR TEMPERATURE (OUTDOOR

---------

F ----------

F

DIFFERENTIAL

 

---------

F ----------

F

APPLICATION USE -------------------------

ROOM (RESIDENTIAL OR COMMERCIAL)

COOLING OR HEATING AREA W ----------

X L -----------

X H -----------

= SQ/CU/FT ------------

Sizing Guide

The following guide is based on normal room insulation average number of sun-exposedwindows andtwo-personoccupancy.

This is a general guide.

Please consult manual J or M for exact load calculations.

1.If heavily shaded, reduce capacity 10%.

2.If very sunny, add 10%.

3.Add 500 BTU/H per person over 2 people.

4.Add 4,000 BTU/H if area is a kitchen.

Due to variations in room design, climate zone and occupancy, larger areas may require the use of multiple units to provide the optimal cooling solution.

23

TROUBLESHOOTING

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

 

 

 

Power disconnected.

Check power source.

 

 

 

 

Branch circuit fuse blown or circuit

Replace fuse, reset breaker. If repeats, check fuse

 

or breaker size. Check for shorts in unit wiring and

 

breaker tripped.

Unit does not run

components.

 

 

 

 

Loose or disconnected wiring at

Check wiring & connections. Connect per wiring

 

switch.

diagram.

 

 

 

 

Inoperative switch (On-Off).

Test for continuity, 3 and 2, 5 and 6. If bad,

 

replace.

 

 

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Dirty filter.

Clean as recommended in Owner's Manual.

 

 

 

 

Restricted airflow.

Check for dirty or obstructed coil clean as

 

required.

 

 

 

 

 

Evaporator coil

Inoperative thermostat.

Test for shorted thermostat or stuck contacts.

 

 

Short of refrigerant.

De-icecoil and check for leak.

freezes up

 

 

 

De-icecoil. Check temperature differential

 

 

 

Partially restricted capillary.

across coil. Touch-testcoil return bends for same

 

 

temperature. Test for low running current.

 

 

 

 

Inoperative fan motor.

Test fan motor & replace if inoperative.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

 

 

 

Excessive heat load.

Test cooling performance of unit. Unit undersized.

 

 

 

 

Restriction in line.

Check for partially iced coil. Check temperature

 

split across coil.

 

 

Compressor runs

 

 

 

Check for presence of oil on silver soldered

continually. Does

 

Refrigerant leak.

connections. Check for partially iced coil. Check

not cycle off.

 

split across coil. Check for low running amperage.

 

 

 

 

 

 

Thermostat contacts stuck.

Check operation of thermostat. Replace if contacts

 

remain closed.

 

 

 

 

 

 

 

 

 

Incorrect thermostat setting.

Set to correct setting.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Loss of charge in thermostat bulb.

Replace thermostat.

 

 

 

Thermostat

Thermostat contacts open.

Test for continuity at terminals 1 and 2. Replace if

defective.

does not turn on

 

 

 

compressor

Incorrect wiring or loose wires.

Connect per wiring diagram. Tighten loose wires.

 

 

 

 

 

System switch open.

Test for continuity at switch terminals 2 and 3.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Thermostat set at coldest point

Adjust.

 

 

 

Thermostat

 

Disconnect power to the unit. Remove cover of

Thermostat contacts stuck.

thermostat and check if contact is stuck, if so

does not turn off

 

replace thermostat.

compressor

 

 

 

 

Switch (On-Off)shorted.

Test switch for open contacts at terminals 2 and 3

 

with switch in “Off” position.

 

 

 

 

 

24

TROUBLESHOOTING

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Compressor attempts to start

Allow a minimum of 3 minutes to allow pressures

 

before system pressures are

 

to equalize before attempting to start.

 

equalized.

 

 

 

 

 

 

 

Check voltage with unit operating. Check for

 

Low or fluctuating voltage.

other appliances on the circuit. Unit should be on

 

separate circuit for proper voltage, and be fused

 

 

Compressor

 

separately

attempts to

 

 

Incorrect wiring

Connect per appropriate wiring diagram

start, or runs for

 

 

Shorted or incorrect capacitor

Replace capacitor

short periods

only. Cycles on

 

 

Restricted or low air flow through

 

overload.

Check motor fan blade.

condenser coil

 

 

 

 

 

 

Compressor running abnormally

Check for refrigerant restriction, blocked airflow,

 

loose wires at compressor terminals and fan

 

hot

 

motor capacitor voltage.

 

 

 

 

 

 

Overload opens too soon.

Change compressor if all other corrections above

 

are normal.

 

 

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Thermostat contacts not closing.

Check continuity of thermostat at coldest setting. If

 

compressor runs, replace thermostat.

 

 

 

 

 

 

Low voltage supply.

Check for nameplate voltage. Provide proper

 

voltage.

 

 

 

 

 

Compressor does

Switch (On-Off)inoperative.

Test for continuity.

not start - fan

Defective capacitor.

Test with analyzer, replace if needed.

motor runs.

Compressor internal overload

Check voltage at compressor terminals. If voltage

 

 

open.

is satisfactory, replace compressor.

 

 

 

 

Solid state relay open.

Replace relay.

 

 

 

 

Open or shorted compressor

Check windings for continuity and resistance. If

 

windings.

open, replace compressor.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Thermostat open or inoperative.

Set to coldest position. Test thermostat and

 

replace if necessary.

 

 

 

 

 

 

Dirty air filter.

Clean as recommended in Owner’s Manual.

 

 

 

 

Dirty or plugged condenser or

Clean coils.

Does not cool, or

evaporator coil.

 

cools only slightly.

 

 

Poor air circulation in area being

Adjust air louvers. Check application. Check for

 

 

dirty filter or evap coil. Check fan motor. Correct as

 

cooled.

 

needed.

 

 

 

 

 

 

Low capacity - undercharge.

Check for leak and make necessary repairs.

 

 

 

 

 

 

 

Compressor not pumping properly.

Replace compressor.

 

 

 

NOTE: If Inside Coil Freezes Up

Your Friedrich Hazardgard is designed not to freeze with outdoor temperatures as low as 45°F (7°C). If the indoor coil should ice over while cooling, set the thermostat to the warmest position until the ice on the coil is gone. Setting the thermostat to a slightly warmer position will probably keep ice from forming on the coil. A dirty filter will contribute to icing.

25

TROUBLESHOOTING

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Defective switch (On-Off)

Check continuity across terminals 2 and 3.

 

 

 

 

Fan capacitor open.

Test with capacitor analyzer. Replace if bad.

 

 

 

 

Inoperative fan motor.

Check power and if okay, perform continuity test.

 

Replace if bad.

 

 

Fan motor does

 

 

Incorrect wiring of fan circuit.

Connect per wiring diagram.

not run.

 

 

Solid state relay open.

Replace relay.

 

 

 

 

 

Seized motor bearings.

Replace motor.

 

 

 

 

Bound fan blade or blower wheel.

Adjust for proper clearance.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

Switch (On-Off)

Defective (On-Off)switch or

 

does not cut fan

Replace switch or relay.

defective relay.

motor off.

 

 

 

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

 

 

 

 

 

Poor installation.

Refer to installation instructions for proper

 

installation.

 

 

 

 

 

 

Fan blade striking chassis or

Adjust fan blade or blower wheel clearance.

 

blower wheel housing.

 

 

Noisy and/or

 

 

 

Check for deteriorated compressor grommets.

vibration.

Compressor vibrating.

Replace as needed.

 

 

 

 

 

 

Loose cabinet parts, improperly

 

 

mounted components, tubing

Adjust and tighten as required.

 

rubbing.

 

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

Evaporator drain pan overflowing.

Clean obstructed drain trough.

 

 

 

Water leaks into

Condensation forming on bottom of

Evaporator drain pan broken or cracked. Replace

base pan.

chassis seal gasket missing or defective.

room.

 

 

Water dripping from discharge air

Dirty evaporator coil, or extremely high humidity

 

 

grilles.

conditions. Clean coil or check application.

 

 

 

 

 

 

PROBLEM

POSSIBLECAUSE

POSSIBLESOLUTION

 

 

 

 

 

 

 

Extremely high humid conditions.

Install 01900-235drain kit.

 

 

 

 

Water in center section of base pan

Drain trough. Check level. Ensure 1/4” tilt toward

Excessive water

(compressor area).

rear.

leaks outside.

Dirty condenser coil.

Clean with steam or detergent.

 

 

 

 

Fan blade and slinger ring

Adjust fan blade to 1/2” clearance from condenser

 

improperly positioned.

coil.

 

 

 

26

ELECTROMECHANICAL CONTROL

COOL ONLY MODELS:

SH15M30*

SH20M30*

*Last character may vary.

27

Friedrich Air Conditioning Company

10001 Reunion Place, Suite 500

San Antonio, TX 78216

1-800-541-6645

www.friedrich.com

HAZARDGARD®

ROOM AIR CONDITIONERS

LIMITED WARRANTY

LIMITED ONE YEAR PARTS WARRANTY

1.Limited warranty – One year. Friedrich warrants that it will provide a replacement for any part of this Hazardgard Room Air Conditioner found defective in material or workmanship for a period of one (1) year from the date of original purchase.

2.Limited warranty – One year. The Friedrich warranty also covers the cost of labor for repairing any compressor, condenser, evaporator or inter-connectingtubing found defective within the warranty period, providing the unit is returned to an authorized Friedrich Repair Station located within the Continental United States.

The Friedrich warranty does not cover:

(1) Any charges for removal, transportation or reinstallation of the unit; (2) the cost of labor to replace parts other than those described above; and (3) does not apply to any HazardGard Room Air Conditioner that has been subject to (a) accident, misuse, fl ood, fi re, or neglect; (b) repairs or alterations outside of the Friedrich Authorized Dealer or Service Center so as to affect adversely its performance and reliability; or (c) any repairs or servicing as a result of using parts not sold or approved by Friedrich.

LIMITATIONS: This warranty is a LIMITED warranty. Anything in the warranty notwithstanding, IMPLIED WARRANTIES FOR PARTICULAR PURPOSE AND MERCHANTABILITY SHALL BE LIMITED TO THE DURATION OF THE EXPRESS WARRANTY. MANUFACTURER EXPRESSLY DISCLAIMS AND EXCLUDES ANY LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES FOR BREACH OF ANY EXPRESSED OR IMPLIED WARRANTY.

Performance of Friedrich’s Warranty obligation is limited to one of the following methods:

1.Repair of the unit

2.A refund to the customer for the prorated value of the unit based upon the remaining warranty period of the unit.

3.Providing a replacement unit of equal value

The method of fulfi llment of the warranty obligation is at the sole discretion of Friedrich Air Conditioning.

WARNING: - EXPLOSION HAZARD -

USE FRIEDRICH PARTS ONLY

SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS 1, DIVISION 2

(11 - 09)

28

TECHNICAL SUPPORT CONTACT INFORMATION

FRIEDRICH AIR CONDITIONING CO.

10001 Reunion Place, Ste. 500, San Antonio, TX 78216

(210) 546-0500877-599-5665x 261 FAX (210)546-0731Email: tac@friedrich.com

www.friedrich.com

Printed in the U.S.A.

29

FRIEDRICH AIR CONDITIONING CO.

10001 Reunion Place, Ste. 500, San Antonio, TX 78216 P 210-546-0500|F 210-546-0731

www.friedrich.com

Printed in the U.S.A.

HG-ServMan(1-11)