Friedrich H)A09K25L User Manual

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S e r v i c e M a n u a l – R 4 1 0 A M o d e l s

A Series (Electronic Controls)

Single Package Vertical Air Conditioning System

L Suffix Models

V(E, H)A09K25L-*

V(E, H)A09K34L-*

V(E, H)A09K50L-*

V(E, H)A12K25L-*

V(E, H)A12K34L-*

V(E, H)A12K50L-*

V(E, H)A18K25L-*

V(E, H)A18K34L-*

V(E, H)A18K25L-*

V(E, H)A24K25L-*

V(E, H)A24K34L-*

V(E, H)A24K50L-*

V(E, H)A24K75L-*

V(E, H)A24K10L-*

 

VPK-ServMan-L(1-10)

*Last Digit May Vary

INTRODUCTION

This service manual is designed to be used in conjunction with the installation manuals 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 Identification.)

TECHNICAL SUPPORT

CONTACT INFORMATION

FRIEDRICH AIR CONDITIONING CO.

Post Office Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212(210)357-4400·1-800-541-6645· FAX (210)357-4490www.friedrich.com

Printed in the U.S.A.

Table of Contents

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

2-4

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

4

Vert-I-PakModel Number Identification Guide ...................

5

Serial Number Identification Guide ....................................

5

Chassis Specifications .......................................................

6

Extended Cooling Performance .........................................

7

Electrical Requirements .....................................................

8

Remote Thermostat and Low Voltage Control ..............

9-10

V-PAKElectronic Control Board Features ........................

11

Electronic Control Configuration .......................................

12

Electronic Control Error Code

 

Diagnostics/Test Mode .................................................

12-13

Electronic Control Features ..............................................

14

Checking External Static Pressure ...................................

15

Checking Approximate Airflow ..........................................

16

Airflow Charts ....................................................................

16

Components Testing ....................................................

17-18

Refrigeration Sequence of Operation ...............................

19

Service .............................................................................

20

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

21

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

21

Method Of Charging .........................................................

22

Undercharged Refrigerant Systems ............................

22-23

Overcharged Refrigerant Systems ...................................

23

Restricted Refrigerant Systems .......................................

23

Capillary Tube Systems/Check Valve ..........................

24

Reversing Valve — Description/Operation ..................

25

Testing Coil ..................................................................

25

Checking Reversing Valves ....................................

25-26

Reversing Valve

 

Touch Testing Heating/Cooling Cycle .........................

26

Procedure For Changing Reversing Valve .............

26-27

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

27

Locked Rotor Voltage Test ..........................................

27

Single Phase Connections .........................................

27

Determine Locked Rotor Voltage ...............................

27

Locked Rotor Amperage Test ......................................

27

Single Phase Running & Locked Rotor Amperage .....

27

Checking the Overload ...........................................

27-28

External Overload ........................................................

28

Compressor Single Phase Resistance Test ................

28

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

29-30

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

30

9-18Electrical Troubleshooting Chart – Cooling .........

31

2-TonElectrical Troubleshooting Chart – Cooling .......

32

Electrical Troubleshooting Chart – Heat Pump ...........

33

Refrigerant System Diagnosis – Cooling ....................

34

Refrigerant System Diagnosis – Heating ....................

34

Electrical and Thermostat Wiring Diagrams ...........

35-40

Technical Service Data ................................................

41

1

IMPORTANT SAFETY INFORMATION

The information contained in this manual is intended for use by a qualified 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 unqualified persons can result in subjecting the unqualified 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 qualified 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 specified amperage rating.

Use on a properly grounded outlet only.

Do not remove ground prong of plug.

Do not cut or modify the power supply cord.

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 flame or hot surfaces can cause serious burns.

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

Have a fire extinguisher at hand while using a torch.

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

Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks, flushing 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 fins 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 specified amperage rating.

Connect to a properly grounded outlet only.

Do not remove ground prong of plug.

Do not cut or modify the power supply cord.

Do not use extension cords with the unit.

Failure to follow these instructions can result in fire 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 sufficient 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.

4

 

Model Identification Guide

 

 

 

 

 

 

 

 

 

 

 

 

MODEL NUMBER

 

V

E

A

24

K

50

RT

L

 

SERIES

 

 

 

 

 

 

 

 

 

ENGINEERING CODE

V=Vertical Series

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

E=Cooling with or without electric heat

 

 

 

 

 

 

OPTIONS

H=Heat Pump

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RT = Standard Remote Operation

DESIGN SERIES

 

 

 

 

 

 

 

 

 

SP = Seacoast Protected

A = 32" and 47" Cabinet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOMINAL CAPACITY

 

 

 

 

 

 

 

 

 

ELECTRIC HEATER SIZE

A-Series(Btu/h)

 

 

 

 

 

 

 

 

 

A-Series

09 = 9,000

 

 

 

 

 

 

 

 

 

00 = No electric heat

12 = 12,000

 

 

 

 

 

 

 

 

 

25 = 2.5 KW

18 = 18,000

 

 

 

 

 

 

 

 

 

34 = 3.4 KW

24 = 24,000

 

 

 

 

 

 

 

 

 

50 = 5.0 KW

 

 

 

 

 

 

 

 

 

 

75 = 7.5 KW

VOLTAGE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 = 10 KW

K = 208/230V-1Ph-60Hz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VPAK Serial Number Identification Guide

SERIAL NUMBER

 

A

K

A

N

00001

YEAR MANUFACTURED

 

 

 

 

PRODUCTION RUN NUMBER

LJ = 2009

AE = 2015

 

 

 

 

 

AK = 2010

AF = 2016

 

 

 

 

PRODUCT LINE

AA = 2011

AG = 2017

 

 

 

 

AB = 2012

AH = 2018

 

 

 

 

N = VPAK

AC = 2013

AJ = 2019

 

 

 

 

 

AD = 2014

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MONTH MANUFACTURED

 

 

 

 

 

A = Jan

D = Apr

G = Jul

K = Oct

 

 

 

B = Feb

E = May

H = Aug

L = Nov

 

 

 

C = Mar

F = Jun

J = Sep

M = Dec

 

 

 

5

Chassis Specifications

Model 2010

VEA09K

VEA12K

VEA18K

VEA24K

COOLING DATA

 

 

 

 

COOLING BTUh

9400/9000

11500/11200

17000/16500

23000/22700

POWER (W)

959

1173

1888

2421

EER

9.8/9.8

9.8/9.8

9.0/9.0

9.5/9.5

SENSIBLE HEAT RATIO

0.74

0.72

0.70

0.70

HEAT PUMP DATA

 

 

 

 

HEATING BTUh

 

N/A

 

COP @ 47F

 

N/A

 

HEATING POWER (W)

 

N/A

 

HEATING CURRENT (A)

 

N/A

 

ELECTRICAL DATA

 

 

 

 

VOLTAGE (1 PHASE, 60 Hz)

230/208

230/208

230/208

230/208

VOLT RANGE

253-198

253-198

253-198

253-198

COOLING CURRENT (A)

4.2/4.4

5.2/5.4

8.1/8.5

10.0/10.4

AMPS L.R.

19.8

30

42

34.8

AMPS F.L.

3.5

4.5

7.8

9.5

INDOOR MOTOR (HP)

1/4

1/4

1/4

1/4

INDOOR MOTOR (A)

1.2

1.2

1.2

1.94

OUTDOOR MOTOR (HP)

 

N/A

 

1/4

OUTDOOR MOTOR (A)

 

N/A

 

0.85

AIRFLOW DATA

 

 

 

 

INDOOR CFM*

300

350

450

610

VENT CFM

60

60

60

60

MAX. ESP

.3"

.3"

.3"

.4"

PHYSICAL

 

 

 

 

DIMENSIONS (W x D x H)

23x23x32

23x23x32

23x23x32

23x23x47

NET WEIGHT (LBS)

114

124

144

167

SHIPPING WEIGHT (LBS)

125

135

155

220

R410A CHARGE (oz)

33.5

35.5

48

65

* Normal Value Wet Coil @ .1"ESP.

VHA09K

VHA12K

VHA18K

VHA24K

 

 

 

 

9200/9000

11500/11200

17000/16800

23000/22800

939

1186

1868

2527

9.8/9.8

9.7/9.7

9.1/9.1

9.1/9.1

0.74

0.72

0.70

0.70

 

 

 

 

8500

10800

16000

20000

3.0

3.0

3.0

3.0

830

1055

1563

1953

3.6

4.9

7.5

9.4

 

 

 

 

230/208

230/208

230/208

230/208

253-198

253-198

253-198

253-198

4.1/4.3

5.3/5.5

8.2/8.5

10.6/10.8

18.5

26

42

34.8

3.5

5

7.8

9.5

1/4

1/4

1/4

1/4

1.2

1.2

1.2

1.94

 

N/A

 

1/4

 

N/A

 

0.85

 

 

 

 

300

420

450

610

60

60

60

60

.3"

.3"

.3"

.4"

 

 

 

 

23x23x32

23x23x32

23x23x32

23x23x47

114

125

144

167

125

135

155

220

39

42

52

74

ELECTRIC HEAT DATA

 

 

 

 

 

 

 

 

 

 

VE/VHA09

 

 

VE/VHA12

 

 

 

HEATER WATTS

2500/2050

3400/2780

5000/4090

2500/2050

3400/2780

5000/4090

 

 

VOLTAGE

 

230/208

 

 

230/208

 

 

 

HEATING BTUh

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

 

 

HEATING CURRENT (AMPS)

10.9/9.9

14.8/13.4

21.7/19.7

10.9/9.9

14.8/13.4

21.7/19.7

 

 

MINIMUM CIRCUIT AMPACITY

15

19.9

28.6

15

19.9

28.6

 

 

BRANCH CIRCUIT FUSE (AMPS)

15

20

30

15

20

30

 

 

BASIC HEATER SIZE

2.5 Kw

3.4 Kw

5.0 Kw

2.5 Kw

3.4 Kw

5.0 Kw

 

 

 

 

 

 

 

 

 

 

 

ELECTRIC HEAT DATA

 

 

 

 

 

 

 

 

 

 

VE/VHA18

 

 

 

VE/VHA24

 

 

HEATER WATTS

2500/2050

3400/2780

5000/4090

2500/2050

3400/2780

5000/4090

7500/6135

10000/8180

VOLTAGE

 

230/208

 

 

 

230/208

 

 

HEATING BTUh

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

25598/2093934130/27918

HEATING CURRENT (AMPS)

10.9/9.9

14.8/13.4

21.7/19.7

10.9/9.9

14.8/13.4

21.7/19.7

32.6/29.5

43.5/39.3

MINIMUM CIRCUIT AMPACITY

15

19.9

28.6

17.2/15.9

22.1/20.3

30.7/28.1

44.3/40.3

57.9/52.7

BRANCH CIRCUIT FUSE (AMPS)

15

20

30

25

25

30

45

60

BASIC HEATER SIZE

2.5 Kw

3.4 Kw

5.0 Kw

2.5 Kw

3.4 Kw

5.0 Kw

7.5 Kw

10.0 Kw

6

Extended Cooling Performance

VEA - EXTENDED COOLING PERFORMANCE

 

 

 

 

 

OUTDOOR DRY BULB TEMP. (DEGREES F AT 40% R.H.)

 

 

 

 

 

 

75

 

 

85

 

 

95

 

 

105

 

 

110

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

INDOOR WET

BULB TEMP. (DEGREES F AT 80 F D.B.)

 

 

 

 

 

72

67

62

72

67

62

72

67

62

72

67

62

72

67

62

 

BTUh

11054

10631

9842

10528

9926

9156

10114

9400

8319

9475

8413

7417

8954

7835

6914

VEA09

WATTS

783

795

804

853

861

872

959

959

959

1037

1036

1039

1084

1083

1087

AMPS

3.5

3.5

3.5

3.7

3.8

3.8

4.2

4.20

4.2

4.5

4.5

4.5

4.7

4.7

4.7

 

 

SHR

0.51

0.69

0.93

0.52

0.71

0.95

0.52

0.74

0.95

0.53

0.78

0.96

0.55

0.81

0.95

 

BTUh

13524

13007

12041

12880

12144

11201

12374

11500

10178

11592

10293

9074

10954

9585

8458

VEA12

WATTS

957

972

983

1043

1053

1066

1173

1173

1173

1268

1267

1270

1325

1325

1330

AMPS

4.3

4.3

4.4

4.6

4.7

4.7

5.2

5.20

5.2

5.6

5.6

5.6

5.9

5.9

5.9

 

 

SHR

0.49

0.67

0.90

0.50

0.70

0.92

0.51

0.72

0.92

0.52

0.76

0.93

0.53

0.79

0.93

 

BTUh

19992

19227

17799

19040

17952

16558

18292

17000

15045

17136

15215

13413

16193

14170

12504

VEA18

WATTS

1541

1565

1582

1678

1695

1716

1888

1888

1888

2041

2039

2045

2133

2132

2140

AMPS

6.7

6.7

6.8

7.2

7.2

7.3

8.1

8.10

8.1

8.7

8.7

8.7

9.1

9.1

9.1

 

 

SHR

0.48

0.65

0.88

0.49

0.68

0.89

0.49

0.70

0.90

0.50

0.74

0.90

0.52

0.76

0.9

 

BTUh

27048

26013

24081

25760

24288

22402

24748

23000

20355

23184

20585

18147

21908

19171

16917

VEA24

WATTS

1976

2007

2029

2152

2174

2201

2421

2421

2421

2617

2615

2622

2736

2735

2744

AMPS

8.3

8.3

8.4

8.9

9.0

9.0

10.0

10.00

10.1

10.8

10.8

10.8

11.3

11.3

11.3

 

 

SHR

0.48

0.65

0.88

0.49

0.68

0.89

0.49

0.70

0.9

0.5

0.74

0.9

0.52

0.76

0.9

 

 

 

 

 

 

 

 

RATING POINT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ARI 310/380

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VHA - EXTENDED COOLING PERFORMANCE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTDOOR DRY BULB TEMP. (DEGREES F AT 40% R.H.)

 

 

 

 

 

 

75

 

 

85

 

 

95

 

 

105

 

 

110

 

 

 

 

 

 

INDOOR WET

BULB TEMP. (DEGREES F AT 80 F D.B.)

 

 

 

 

 

72

67

62

72

67

62

72

67

62

72

67

62

72

67

62

 

BTUh

10819

10405

9632

10304

9715

8961

9899

9200

8142

9274

8234

7259

8763

7668

6767

VHA09

WATTS

766

778

787

835

843

854

939

939

939

1015

1014

1017

1061

1061

1064

AMPS

3.4

3.4

3.5

3.7

3.7

3.7

4.1

4.10

4.1

4.4

4.4

4.4

4.6

4.6

4.6

 

 

SHR

0.51

0.69

0.93

0.52

0.71

0.95

0.52

0.74

0.95

0.53

0.78

0.96

0.55

0.81

0.95

 

BTUh

13524

13007

12041

12880

12144

11201

12374

11500

10178

11592

10293

9074

10954

9585

8458

VHA12

WATTS

968

983

994

1054

1065

1078

1186

1186

1186

1282

1281

1284

1340

1340

1344

AMPS

4.4

4.4

4.5

4.7

4.7

4.8

5.3

5.30

5.3

5.7

5.7

5.7

6

6

6

 

 

SHR

0.49

0.67

0.9

0.5

0.7

0.92

0.51

0.72

0.92

0.52

0.76

0.93

0.53

0.79

0.93

 

BTUh

19992

19227

17799

19040

17952

16558

18292

17000

15045

17136

15215

13413

16193

14170

12504

VHA18

WATTS

1524

1549

1565

1661

1677

1698

1868

1868

1868

2019

2017

2023

2111

2110

2117

AMPS

6.8

6.8

6.9

7.3

7.3

7.4

8.2

8.20

8.2

8.8

8.8

8.9

9.2

9.2

9.3

 

 

SHR

0.48

0.65

0.88

0.49

0.68

0.89

0.49

0.70

0.90

0.50

0.74

0.90

0.52

0.76

0.9

 

BTUh

27048

26013

24081

25760

24288

22402

24748

23000

20355

23184

20585

18147

21908

19171

16917

VHA24

WATTS

2062

2095

2118

2247

2269

2297

2527

2527

2527

2732

2729

2737

2856

2854

2864

AMPS

8.8

8.8

8.9

9.4

9.5

9.5

10.5

10.60

10.7

11.4

11.4

11.4

11.9

11.9

12

 

 

SHR

0.48

0.65

0.88

0.49

0.68

0.89

0.49

0.70

0.90

0.50

0.74

0.90

0.52

0.76

0.9

 

 

 

 

 

 

 

 

RATING POINT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ARI 310/380

 

 

 

 

 

 

7

WARNING

ELECTRIC SHOCK HAZARD

Turn off electric power before service or installation. All electrical connnections and wiring MUST be installed by a qualified electrician and conform to the National Electrical Code and all local codes which have jurisdiction. Failure to do so can result in personal injury and/or death.

ELECTRICAL REQUIREMENTS

Wire Size

“Use ONLY time delayed fused disconnect or HACR type circuit breaker as indicated on the unit’s rating plate (see sample on this page). Proper current protection to the unit is the responsibility of the owner”.

Unit MUST

All units must be hard wired with properly sized breaker. See nameplate for specific chassis electrical requirements. See Electrical Rating Table below for wire size. Use HACR type breakers to avoid nuisance trips. All field wiring must be done in accordance with NEC and local codes.

Electrical Rating Tables

 

 

 

 

15A

14

20A

12

30A

10

Supply voltage

Supply voltage to the unit should be a nominal 208/230 volts. It must be between 197 volts and 253 volts. Supply voltage to the unit should be checked WITH THE UNIT IN OPERATION. Voltage readings outside the specified range can be expected to cause operating problems. Their cause MUST be investigated and corrected.

Sample Nameplate

 

 

 

 

 

120524

 

 

 

 

 

 

 

 

 

 

 

COOLING EQUIPMENT

 

 

 

 

 

E

 

 

 

 

 

L

 

 

 

 

P

 

 

 

 

M

 

 

FOLLOWING ITEMS

 

A

 

 

 

 

 

S

 

 

 

 

OUTDOOR GRILLE

 

 

 

 

 

 

 

 

 

 

 

 

INDOOR GRILLE

8

Remote Thermostat and Low Voltage Control

Connections

 

Cool Off Heat

Auto On

RT5 (Two speed fan)

RT4 (One speed fan)

 

Remote Thermostat

Location

 

All Friedrich Vert-I-Pakunits are factory configured to be controlled by using a 24V single stage remote wall mounted thermostat. The thermostat may be auto or manual changeover as long as the control configuration matches that of theVert-I-Pakunit.

Manual Changeover Thermostat

For Heat Pump equipped units: a single stage, heat/cool thermostat with a terminal for a reversing valve operation is required. Terminal “B” should be continuously energized in the heat mode and terminal “G” should be energized whenever there is a call for heating or cooling. (Typically, a single stage, heat/cool thermostat designed for use with electric heat systems will meet the above requirements).

NOTICE

DO NOT use a two (2) stage Heat Pump Thermostat. Use of this type of thermostat may result in equipment and/or property damage

To control the unit with a wall-mountedthermostat:

1)Pull the disconnect switch.

2)Unscrew and remove the control box panel.

3)After selecting which side you want to run your thermostat wire through, run the wires through the side hole in the box to reach the connection terminal for the wiring.

4)Make the wire connections, appropriately matching the wires as shown in the wiring diagram.

5)Once each wire is matched and connected, the unit is now controlled by the thermostat.

6)Reattach the control box cover.

The thermostat should not be mounted where it may be affected by drafts, discharge air from registers (hot or cold), or heat radiated from the sun or appliances.

The thermostat should be located about 5 Ft. above the floor in an area of average temperature, with good air

circulation. Close proximity to the return air grille is the best choice.

Mercury bulb type thermostats MUST be level to control temperature accurately to the desired set-point.Electronic digital type thermostats SHOULD be level for aesthetics.

Thermostat Location

NOTE: An improperly operating, or poorly located room thermostat can be the source of perceived equipment problems. A careful check of the thermostat and wiring must be made then to insure that it is not the source of problems.

9

Remote Thermostat and Low Voltage Control

Connections (Continued)

Thermostat Connections

C

=

Common Ground

W

=

Call for Heating

Y

=

Call for Cooling

R

=

24V Power from Unit

GL

=

Call for Fan (Low Speed)

GH

=

Call for Fan (High Speed)

B

=

Reversing Valve Energized in heating mode

*If only one G terminal is present on thermostat, connect to GL for low fan or to GH for high fan operation.

NOTE: It is the installer’s responsibility to ensure that all control wiring connections are made in accordance with the Freidrich installation instructions. Questions concerning proper connections to the unit should be directed to the factory: 210-357-4400.

Desk Control Terminals

The Friedrich VERT-I-PAKhasbuilt-inprovisions for connection to an external switch to control power to the unit. The switch can be a central desk control system or even a normally open door switch.

For desk control operation, connect one side of the switch to the D1 terminal and the other to the D2 terminal. Whenever the switch closes, the unit operation will stop.

Maximum Wire Length for Desk Control Switch

Wire Size

Maximum Length

 

#24

400 ft.

 

#22

600 ft.

Note: The desk

#20

900 ft.

 

 

control system and

#18

1500 ft.

switches must be

#16

2000 ft.

field supplied.

Auxiliary Fan Control

The Smart Center also has the ability to control a 24VAC relay to activate an auxiliary, or transfer, fan. The outputs are listed as F1 and F2 on the control board.

To connect the relay, simply wire one side of the relay to F1 and the other side to F2. Anytime that the fan runs, the terminals will send a 24VAC signal to the relay. The relay must be 24 VAC, 50mA or less.

Note: The relay and auxiliary fans must be field supplied.

10

ELECTRONIC CONTROL BOARD FEATURES

The new Friedrich Vert-I-Pakhas state of the art features to improve guest comfort and conserve energy. Through the use of specifically designed control software, Friedrich has accomplished what other Manufacturer’s have only attempted – a quiet, dependable, affordable and easy to useVert-I-Pak.

Below is a list of standard features on every Friedrich VPAK and their benefit to the owner.

Quiet Start/Stop

The fan start and stop delays prevent abrupt changes in room acoustics due to the compressor energizing

or stopping immediately. Upon call for cooling or heating the unit fan will run for five seconds prior to en-

Fan Delay

ergizing the compressor. Also, the fan off delay allows for “free cooling” by utilizing the already cool indoor

 

coil to its maximum capacity by running for 30 seconds after the compressor.

 

 

Remote Thermostat

VPAK units are thermostat controlled.

Operation

 

 

 

Internal Diagnostic

The new Friedrich digital VPAK features a self diagnostic program that can alert maintenance to compo-

Program

nent failures or operating problems. The internal diagnostic program saves properties valuable time when

diagnosing running problems.

 

 

Service Error Code

The self diagnosis program will also store error codes in memory if certain conditions occur and correct

themselves such as extreme high or low operating conditions or activation of the room freeze protection

Storage

feature. Storing error codes can help properties determine if the unit faced obscure conditions or if an error

 

occurred and corrected itself.

 

 

 

When the VPAK senses that the indoor room temperature has fallen to 40°F the unit will cycle on high fan

Room Freeze

and the electric strip heat to raise the room temperature to 46°F then cycle off again. This feature works

Protection

regardless of the mode selected and can be turned off. The control will also store the Room Freeze cycle

in the service code memory for retrieval at a later date. This feature ensures that unoccupied rooms do not

 

reach freezing levels where damage can occur to plumbing and fixtures.

 

 

Random

Multiple compressors starting at once can often cause electrical overloads and premature unit failure.

Compressor Restart

The random restart delay eliminates multiple units from starting at once following a power outage or initial

power up. The compressor delay will range from 180 to 240 seconds.

 

 

Digital Defrost

The new Friedrich VPAK uses a digital thermostat to accurately monitor the outdoor coil conditions to allow

Thermostat

the heat pump to run whenever conditions are correct. Running the VPAK in heat pump mode save energy

and reduces operating costs. The digital thermostat allows maximization of heat pump run time.

 

 

Instant Heat

Heat pump models will automatically run the electric heater during compressor lock-outto quickly provide

Heat Pump Mode

heat when initially energized, then return to heat pump mode. This ensures that the room is heated quickly

without the usual delay associated with heat pump units.

 

 

Emergency Heat

In the event of a compressor failure in heat pump mode the compressor may be locked out to provide heat

Override

through the resistance heater. This feature ensures that even in the unlikely event of a compressor failure

the room temperature can be maintained until the compressor can be serviced.

 

 

Desk Control Ready

All electronic VPAK units have low voltage terminals ready to connect a desk control energy management

system. Controlling the unit from a remote location like the front desk can reduce energy usage and

 

requires no additional accessories at the VPAK.

 

 

Indoor Coil Frost

The frost sensor protects the compressor from damage in the event that airfl ow is reduced or low outdoor

temperatures cause the indoor coil to freeze. When the indoor coil reaches 30°F the compressor is

Sensor

diabled and the fan continues to operate based on demand. Once the coil temperature returns to 45°F the

 

compressor returns to operation.

 

 

Ultra-QuietAir

The VPAK series units feature a indoor fan system design that reduces sound levels without

System

lowering airflow and preventing proper air circulation.

 

 

High Efficiency

The VPAK benefits quality components and extensive development to ensure a quiet, efficient and

dependable unit.

 

 

 

Rotary Compressor

High efficiency rotary compressors are used on all Friedrich VPAKs to maximize durability and efficiency.

 

 

Auxiliary Fan Ready

The VPAK features a 24V AC terminal for connection to an auxiliary fan that may be used to transfer air to

adjoining rooms. Auxiliary fans can provide conditioning to multiple rooms.

 

 

 

11

Electronic Control Configuration

The adjustable control dip switches are located at the lower left hand portion of the digital Smart Center. The inputs are only visible and accessible with the front cover removed from the Unit.

Factory Dip Switch Configuration

O

1

2

3

4

5

6

7

8

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dip Switch Setting

Switches 1-4ON

Switch 5-7OFF Switch 8 ON

Room Freeze Protection – Switch 6

Units are shipped from the factory with the room freeze protection disabled. Room Freeze Protection can be switched on at the owner’s preference by moving Dip Switch 6 to ‘ON’. This feature will monitor the indoor room conditions and in the event that the room falls below 40°F the unit will cycle on high fan with the electric heater. This occurs regardless of mode.

Emergency Heat Override – Switch 7

Units are shipped from the factory with the room emergency heat override disabled. In the unlikely event of a compressor failure a heat pump unit may be switched to operate in only the electric heat mode until repairs can be made, by moving Dip Switch 7 to ‘ON’.

Discharge Air Sensor Override – Switch 8

This switch MUST remain in the “ON” position for Vert-I-Pakmodels, since they do not use a discharge air sensor. If the switch is positioned in the “OFF” position on these models it will result in the erroneous display Error Code 14 indicating that the Discharge air temperature sensor is open or shorted.

Note: In order for the control to recognize “Dip” switch setting changes, the unit must be disconnected from power supply when making any configuration changes.

Electronic Control Error Code

Diagnostics and Test Mode

Error Code Diagnostics

The VPAK electronic control continuously monitors the Vert-I-Pakunit operation and will store error codes if certain conditions are witnessed. In some cases the unit may take action and shut the unit off until conditions are corrected.

To access the error code menu press the ‘HEAT’ and ‘HIGH

FAN’ buttons simultaneously for three seconds. If error codes are present they will be displayed. If multiple codes exist you can toggle between error codes using thetemp up ▲button. To clear all codes press thetemp down ▼button for three seconds while in the error code mode. To exit without losing codes press the ‘Low Fan’ button.

Button Location for Vert-I-PakModels

With the remote thermostat escutcheon installed, the button locations to access the diagnostics mode can be located as shown below.

Cool

 

 

High fan

 

Heat

Temp

Power

Temp

 

Fan only

Low fan

*Heat and high fan - access error codes

*Temp up ▲ and temp down ▼ - toggle between error codes

*Low fan - exit error code mode without losing stored error codes.

*Temp down ▼ - clears all error codes

NOTE: Hold buttons down for three seconds.

12

Electronic Control Error Code Diagnostics

Error

Code Translation

Action Taken By Unit

 

Possible Cause

Code

 

 

 

 

 

EF

Error Free

None

 

Unit Operating Normally

 

 

 

 

 

 

Extreme low voltage condition exists (<198V

Shut unit down. Flash error code.

When

• Inadequate power supply

02

voltage rises to adequate level normal unit

• Defective breaker

 

for 230V units and <239V for 265V units).

operation is restored.

 

• Blown fuse

 

 

 

03

Return air thermistor sensor open or

Leave unit running. Alternately flash error

• Defective sensor

 

short circuit

code and set point.

 

 

04

Indoor coil thermistor sensor open or

Leave unit running. Alternately flash

 

 

 

short circuit

error code and set point.

 

 

 

 

Leave unit running. Switch to Electric Heat

 

05

Outdoor coil thermistor sensor open

Mode (Heat Pump only). Alternately flash

• Defective sensor

 

or short circuit

error code and set point.

 

 

 

 

 

 

 

 

Shut unit down for 5 minutes, Alternately

• Dirty coil

 

Outdoor coil Temperature > 175° F for

flash error code and set point, then try again

06

2 consecutive minutes. (Heat Pump

2 times, if unit fails the 3rd time then shut

• Fan motor failure

• Restricted air flow

 

models only)

unit down and alternately flash error code

Non-condensablesin refrigeration system

 

 

and set point.

 

 

 

 

 

 

 

Shut down Compressor, and continue fan

• Dirty filters

 

 

operation. Alternately flash error code and

• Dirty coil

07

Indoor coil temperature <30° F for 2

set point until the indoor coil thermistor

• Fan motor failure

 

consecutive minutes.

reaches 45° F. Then, (after lockout time of

• Restricted air flow

 

 

180 to 240 seconds expires), re-energize

• Improper refrigerant charge

 

 

the compressor .

 

• Restriction in refrigerant circuit

 

Unit cycles (Heat or Cool demand) >

Leave unit running. Store error code in

• Unit oversized

08

memory.

 

9 times per hour

 

• Low load conditions

 

 

 

 

 

 

 

09

Unit cycles (Heat or Cool demand) <

Leave unit running. Store Error Code in

• Unit undersized

memory.

 

3 times per hour

 

• High load conditions

 

 

 

 

 

 

 

 

 

Leave unit running. Alternately flash error

 

10

Room Freeze Protection triggered

code and set point.

 

• Room temperature fell below 40°F

 

 

 

 

 

11

No Signal to “GL or “GH” terminal

Shut unit down. Flash error code.

 

• Defective remote thermostat

 

• Defective thermostat wiring

 

 

 

 

 

High Pressure switch open (24K BTU Only)

 

 

• Dirty coil

13

Shut unit down. Flash error code.

 

• Fan motor failure

 

Jumper wire loose/missing (9-18KBTU)

 

 

• Restricted air flow

 

 

 

 

Non-condensablesin refrigeration system

14

Discharge air temperature sensor open or

Leave unit running. Alternately flash error

• Dip switch # 8 set to "OFF" position

 

shorted

code and set point.

 

 

 

 

 

 

 

Diagnostics

The Electronic control continuously monitors the VPAK unit operation and will store service codes if certain conditions are witnessed. In some cases the unit may take action and shut the unit off until conditions are corrected. To access the error code menu press the ‘Heat’ and‘High Fan’ buttons simultaneously for three seconds. If

error codes

are present they will be displayed. If multiple codes exist you can toggle between messages using the

temp up

button. To clear all codes press the temp down button for three seconds while in the error code mode. To

exit without changing codes press the ‘Low Fan’ button.

Test Mode

For service and diagnostic use only, the built-intimers and delays on the VPAK may be bypassed by pressing the‘Cool’ and

‘Low Fan’ buttons simultaneously for three seconds while in any mode to enter the test mode.CE will be displayed when entering test mode, andOE will be displayed when exiting. The test mode will automatically be exited 30 minutes after entering it or by pressing the‘Cool’ and‘Low Fan’ buttons simultaneously for three seconds.

Note: To access the Test Mode while under remote wall thermostat operation, remove thermostat’s wires at the terminal block on the electronic control board then connect a jumper wire between GL and GH.

13

vpak electronic control FEATURES

Thermostat Compatibility:

The VPAK Electronic Control is compatible with

Friedrich RT4 andRT5 Thermostats.

The VPAK Electronic control is also compatible with most standard Single Stage Heat/Cool Thermostats.

NOTE: Field supplied Thermostats MUST energize the fan circuit on a call for Heating or Cooling, and (when used with a Heat

Pump Unit) MUST energize the “B” terminal in Heating in order for the unit to function correctly.

Compressor Time Delay:

The Electronic control is equipped with a random (180 to 240 seconds) Compressor time delay that is initiated every time the compressor cycles “Off.” The “delay on break” timer is initiated by the following actions:

(1)Satisfying the temperature set point

(2)Changing mode to fan only

(3)Turning the unit off

(4)Restoring power after a failure

Note: The Compressor Time Delay feature is disabled during “Test Mode” operation.

Fan delay:

The Electronic Control is equipped with a feature that will start the fan 5 seconds EARLY

(i.e. before compressor or heater) when unit cycles “ON.” When the unit cycles“OFF” the fan willDELAY for 30 seconds in Cooling and

15 seconds in Heating.

Note: the fan delay is disabled during Test

Mode operation.

Emergency Heat:

The Electronic Control is equipped with a feature that allows servicer/end user to switch to electric heat operation when the compressor fails during the heating season, (See DIP switch position 7) until the compressor can be replaced.

14

External Static Pressure

External Static Pressure can best be defined as the pressure difference (drop) between the Positive Pressure (discharge) and the Negative Pressure (intake) sides of the blower. External Static Pressure is developed by the blower as a result of resistance to airflow (Friction) in the air distribution system EXTERNAL to the VERT-I-PAKcabinet.

Resistance applied externally to the VERT-I-PAK(i.e. duct work, filters, etc.) on either the supply or return side of the system causes an INCREASE in External Static Pressure accompanied by a REDUCTION in airflow.

External Static Pressure is affected by two (2) factors.

1.Resistance to Airflow as already explained.

2.Blower Speed. Changing to a higher or lower blower speed will raise or lower the External Static Pressure accordingly.

These affects must be understood and taken into consideration when checking External Static Pressure/Airflow to insure that the system is operating within design conditions.

Operating a system with insufficient or excessive airflow can cause a variety of different operating problems. Among these are reduced capacity, freezing evaporator coils, premature compressor and/or heating component failures. etc.

System airflow should always be verified upon completion of a new installation, or before a change-out,compressor replacement, or in the case of heat strip failure to insure that the failure was not caused by improper airflow.

1.Set up to measure external static pressure at the supply and return air.

2.Ensure the coil and filter are clean, and that all the registers are open.

3.Determine the external static pressure with the blower operating.

4.Refer to the Air Flow Data for your VERT-I-PAKsystem to find the actual airflow forfactory-selectedfan speeds.

5.If the actual airflow is either too high or too low, the blower speed will need to be changed to appropriate setting or the ductwork will need to be reassessed and corrections made as required.

6.Select a speed, which most closely provides the required airflow for the system.

7.Recheck the external static pressure with the new speed. External static pressure (and actual airflow) will have changed to a higher or lower value depending upon speed selected. Recheck the actual airflow (at this "new" static pressure) to confirm speed selection.

8.Repeat steps 8 and 9 (if necessary) until proper airflow has been obtained.

EXAMPLE: Airflow requirements are calculated as follows: (Having a wet coil creates additional resistance to airflow. This addit ional resistance must be taken into consideration to obtain accurate airflow information.

Checking External Static Pressure

The airflow through the unit can be determined by measuring the external static pressure of the system, and consulting the blower performance data for the specific VERT-I-PAK.

Determining the Indoor CFM: Chart A – CFM

 

 

 

Model

 

 

 

VEA09/VHA09

VEA12/VHA12

VEA18/VHA18

ESP (")

Low

High

Low

High

Low

High

.00"

340

385

420

470

430

480

.10"

300

340

350 *

420 **

400

450

.20"

230

280

290

350

340

400

.30”

140

190

250

300

290

330

Highlighted values indicate rated performance point. Rated performance for

*VEA12

Rated Performance for

**VHA12

 

 

Model

 

VEA24/VHA24

ESP (")

Low

 

High

.00"

690

 

740

.10"

610

 

700

.20"

560

 

640

.30"

510

 

580

.40"

450

 

520

Highlighted values indicate rated performance point.

15

Correct CFM (if needed):

Chart B – Correction Multipliers

Explanation of charts

Chart A is the nominal dry coil VERT-I-PAKCFMs. Chart B is the correction factors beyond nominal conditions.

1 ½ TON SYSTEM ( 18,000 Btu)

Operating on high speed @ 230 volts with dry coil measured external static pressure .10

Air Flow = 450 CFM

In the same SYSTEM used in the previous example but having a WET coil you must use a correction factor of

.95 (i.e. 450 x .95=428 CFM) to allow for the resistance (internal) of the condensate on the coil.

It is important to use the proper procedure to check external Static Pressure and determine actual airflow. Since in the case of the VERT-I-PAK,the condensate will cause a reduction in measured External Static Pressure for the given airflow.

It is also important to remember that when dealing with VERT-l-PAKunits that the measured External Static Pressure increases as the resistance is added externally to the cabinet. Example: duct work, filters, grilles.

Indoor Airflow Data

The Vert-I-PakA series units must be installed with a free return air configuration. The table below lists the indoor airflow at corresponding static pressures. All units are rarted at low speed.

The Vert-I-Pakunits are designed for either single speed or two fan speed operation. For single speed operation refer to the airflow table below and select the most appropriate CFM based on the ESP level. Connect the fan output from the thermostat to the unit on either the GL terminal for low speed or to the GH terminal for high speed operation.

For thermostats with two-speedfan outputs connect the low speed output to the unit GL terminal and the high speed output to the GH terminal.

Ductwork Preparation

If flex duct is used, be sure all the slack is pulled out of the flex duct. Flex duct ESP can increase considerably when not fully extended. DO NOT EXCEED a total of .30 ESP, as this is the MAXIMUM design limit for the VERT-I-PAKA-Seriesunit.

IMPORTANT: FLEX DUCT CAN COLLAPSE AND CAUSE AIRFLOW RESTRICTIONS. DO NOT USE FLEX DUCT FOR: 90 DEGREE BENDS, OR UNSUPPORTED RUNS OF 5 FT. OR MORE.

Fresh Air Door

The Fresh Air Door is an “intake” system. The fresh air door opened via a slide on the front of the chassis located just above the indoor coil. Move the slide left to open and right to close the fresh air door. The system is capable of up to 60 CFM of fresh air @ ~.3” H20 internal static pressure.

Checking Approximate Airflow

If an inclined manometer or Magnehelic gauge is not available to check the External Static Pressure, or the blower performance data is unavailable for your unit, approximate air flow call be calculated by measuring the temperature rise, then using tile following criteria.

KILOWATTS x 3413

= CFM

Temp Rise x 1.08

Electric Heat Strips

The approximate CFM actually being delivered can be calculated by using the following formula:

DO NOT simply use the Kilowatt Rating of the heater (i.e. 2.5, 3.4, 5.0) as this will result in a less-than-correctairflow calculation. Kilowatts may be calculated by multiplying the measured voltage to the unit (heater) times the measured current draw of all heaters (ONLY) in operation to obtain watts. Kilowatts are than obtained by dividing by 1000.

EXAMPLE: Measured voltage to unit (heaters) is 230 volts. Measured Current Draw of strip heaters is 11.0 amps.

230 x 11.0 = 2530 2530/1000 = 2.53 Kilowatts 2.53 x 3413 = 8635

Supply Air

 

95 F

Return Air

 

°

 

75 F

Temperature Rise

 

°

20°

20 x 1.08 = 21.6

 

 

863521.6 = 400 CFM

16

COMPONENTS TESTING

BLOWER / FAN MOTOR

A single phase permanent split capacitor motor is used to drive the evaporator blower and condenser fan. A self-resettingoverload is located inside the motor to protect against high temperature and high amperage conditions.

WARNING

ELECTRIC SHOCK HAZARD

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

BLOWER / FAN MOTOR TEST

1.Visually inspect the motor’s wiring, housing etc., and determine that the capacitor is serviceable.

2.Make sure the motor has cooled down.

3.Disconnect the fan motor wires from the control board.

4.Test for continuity between the windings also, test to ground.

5.If any winding is open or grounded replace the motor.

Many motor capacitors are internally fused. Shorting the terminals will blow the fuse, ruining the capacitor.A20,000 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 possibleshortinthecapacitor.However,fromthe“S”orstart 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 identified terminal is connected to the “S” or start terminal. The identified 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.

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.

17

COMPONENTS TESTING (Continued)

HEATER ELEMENTS AND LIMIT SWITCHES’

SPECIFICATIONS

All heat pumps and electric heat models are equipped with a heating element and a limit switch (bimetal thermostat). The limit is in series with the element and will interrupt the power at a designed temperature.

Should the blower motor fail, filter become clogged or airflow be restricted etc., the high limit switch will open and interrupt the power to the heater before reaching an unsafe temperature condition.

TESTING THE HEATING ELEMENTS AND LIMIT SWITCHES

WARNING

ELECTRIC SHOCK HAZARD

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

Testing of the heating elements can be made with an ohmmeter or continuity tester across the terminals after the power wires have been removed. Test the limit switch for continuity across its input and output terminals.Test below the limit switch’s reset temperature.

DRAIN PAN VALVE

During the cooling mode of operation, condensate which collects in the drain pan is picked up by the condenser fan blade and sprayed onto the condenser coil. This assists in cooling the refrigerant plus evaporating the water.

During the heating mode of operation, it is necessary that water be removed to prevent it from freezing during cold outside temperatures. This could cause the condenser fan blade to freeze in the accumulated water and prevent it from turning.

To provide a means of draining this water, a bellows type drain valve is installed over a drain opening in the base pan.

This valve is temperature sensitive and will open when the outside temperature reaches 40°F. The valve will close gradually as the temperature rises above 40°F to fully close at 60°F.

Bellows Assembly

Drain Pan Valve

18

REFRIGERATION SEQUENCE OF OPERATION

A good understanding of the basic operation of the refrigeration system is essential for the service technician.

Without this understanding, accurate troubleshooting of refrigeration system problems will be more difficult and time consuming, if not (in some cases) entirely impossible. The refrigeration system uses four basic principles (laws) in its operation they are as follows:

1.“Heat always flows from a warmer body to a cooler body.”

2.“Heat must be added to or removed from a substance before a change in state can occur”

3.“Flow is always from a higher pressure area to a lower pressure area.”

4.“The temperature at which a liquid or gas changes state is dependent upon the pressure.”

The refrigeration cycle begins at the compressor. Starting the compressor creates a low pressure in the suction line which draws refrigerant gas (vapor) into the compressor.

The compressor then “compresses” this refrigerant, raising its pressure and its (heat intensity) temperature.

The refrigerant leaves the compressor through the discharge Line as a hot High pressure gas (vapor). The refrigerant enters the condenser coil where it gives up some of its heat. The condenser fan moving air across the coil’s finned surface facilitates the transfer of heat from the refrigerant to the relatively cooler outdoor air.

When a sufficient quantity of heat has been removed from the refrigerant gas (vapor), the refrigerant will “condense”

(i.e. change to a liquid). Once the refrigerant has been condensed (changed) to a liquid it is cooled even further by the air that continues to flow across the condenser coil.

The VPAK design determines at exactly what point (in the condenser) the change of state (i.e. gas to a liquid) takes place. In all cases, however, the refrigerant must be totally condensed (changed) to a Liquid before leaving the condenser coil.

The refrigerant leaves the condenser Coil through the liquid line as a warm high pressure liquid. It next will pass through the refrigerant drier (if so equipped). It is the function of the drier to trap any moisture present in the system, contaminants, and large particulate matter.

The liquid refrigerant next enters the metering device. The metering device is a capillary tube. The purpose of the metering device is to “meter” (i.e. control or measure) the quantity of refrigerant entering the evaporator coil.

In the case of the capillary tube this is accomplished (by design) through size (and length) of device, and the pressure difference present across the device.

Since the evaporator coil is under a lower pressure (due to the suction created by the compressor) than the liquid line, the liquid refrigerant leaves the metering device entering the evaporator coil. As it enters the evaporator coil, the larger area and lower pressure allows the refrigerant to expand and lower its temperature (heat intensity). This expansion is oftenreferred toas “boiling”.Since the unit’s bloweris moving indoor air across the finned surface of the evaporator coil, the expanding refrigerant absorbs some of that heat. This results in a lowering of the indoor air temperature, hence the

“cooling” effect.

The expansion and absorbing of heat cause the liquid refrigerant to evaporate (i.e. change to a gas). Once the refrigerant has been evaporated (changed to a gas), it is heated even further by the air that continues to flow across the evaporator coil.

The particular system design determines at exactly what point (in the evaporator) the change of state (i.e. liquid to a gas) takes place. In all cases, however, the refrigerant must be totally evaporated (changed) to a gas before leaving the evaporator coil.

The low pressure (suction) created by the compressor causes the refrigerant to leave the evaporator through the suction line as a cool low pressure vapor. The refrigerant then returns to the compressor, where the cycle is repeated.

Refrigeration Assembly

1.Compressor

2.Evaporator Coil Assembly

3.Condenser Coil Assembly

4.Capillary Tube

5.Compressor Overload

19

SERVICE

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.

CAUTION

CUT/SEVER HAZARD

Be careful with the sharp edges and corners. Wear protective clothing and gloves, etc.

Failure to do so could result in minor to moderate injury.

Servicing / Chassis Quick Changeouts

.

To Remove the Chassis from the Closet:

A.Disconnect the power coming into the unit from the main breaker panel or the closet mounted disconnect.

B.Switch the wall Thermostat off.

C.Pull the Power Disconnect located in the front of the chassis.

D.Disconnect the electrical connection.

E.Disconnect the duct work.

F.Disconnect condensate drain on 9-18,000BTU models.

G.Slide the chassis out of the wall plenum.

H.Lift the chassis out of the utility closet.

Warranty

20

SEALED REFRIGERATION SYSTEM REPAIRS

IMPORTANT

ANY SEALED SYSTEM REPAIRS TO COOL-ONLYMODELS REQUIRE THE INSTALLATION OF A LIQUID LINE DRIER. ALSO, ANY SEALED SYSTEM REPAIRS TO HEAT PUMP MODELS REQUIRE THE INSTALLATION OF A SUCTION 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 (Hydrofluorocarbon) 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 - 750 lbs.)

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

11.Vacuum Gauge - (0 - 1000 microns)

12. Facilitiesforflowingnitrogenthroughrefrigerationtubing

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 actually 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

Sealed Refrigeration System contains refrigerant 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

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 efficiency.

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 flow 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 specific type of failure will be influenced 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 sufficient 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.

21

Method Of Charging / Repairs

The acceptable method for charging the RAC 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 property 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.

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.

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant 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.

Undercharged Refrigerant Systems

An undercharged system will result in poor performance (low pressures, etc.) in both the heating and cooling cycle.

Whenever you service a unit with an undercharge of refrigerant, always suspect a leak. The leak must be repaired before charging the unit.

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 insufficient 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.

A check of the amperage drawn by the compressor motor should show a lower reading. (Check the Unit

Specification.)

22

After the unit has run 10 to 15 minutes, check the gauge pressures.Gaugesconnectedtosystemwithanundercharge will have low head pressures and substantially low suction pressures.

Improper air flow 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 of the evaporator will not be encountered because the refrigerant willboillaterifatall.Gaugesconnectedtosystemwillusually have higher head pressure (depending upon amount of over charge). Suction pressure should be slightly higher.

Overcharged Refrigerant Systems

Compressor amps will be near normal or higher.

Noncondensables can also cause these symptoms. To confirm,removesomeofthecharge,ifconditionsimprove, system may be overcharged. If conditions don’t improve, Noncondensables are indicated.

Wheneveranoverchargedsystemisindicated,alwaysmake sure that the problem is not caused by air flow problems.

Restricted Refrigerant System

Troubleshooting a restricted refrigerant system can be difficult. 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 specification.

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.

23

HERMETIC COMPONENTS CHECK

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.

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.

METERING DEVICE

Capillary Tube Systems

All units are equipped with capillary tube metering devices.

Checking for restricted capillary tubes.

1.Connect pressure gauges to unit.

2.Start the unit in the cooling mode. If after a few minutes

of operation the pressures are normal, the check valve and the cooling capillary are not restricted.

3.Switch the unit to the heating mode and observe the gauge readings after a few minutes running time. If the system pressure is lower than normal, the heating capillary is restricted.

4.If the operating pressures are lower than normal in both the heating and cooling mode, the cooling capillary is restricted.

CHECK VALVE

A unique two-waycheck valve is used on the reverse cycle heat pumps. It is pressure operated and used to direct the flow of refrigerant through a single filter drier and to the proper capillary tube during either the heating or cooling cycle.

One-wayCheck Valve

(Heat Pump Models)

NOTE: The slide (check) inside the valve is made of teflon.

Should it become necessary to replace the check valve, place a wet cloth around the valve to prevent overheating during the brazing operation.

CHECK VALVE OPERATION

In the cooling mode of operation, high pressure liquid enters the check valve forcing the slide to close the opposite port

(liquid line) to the indoor coil. Refer to refrigerant flow chart. This directs the refrigerant through the filter drier and cooling capillary tube to the indoor coil.

In the heating mode of operation, high pressure refrigerant enters the check valve from the opposite direction, closing

the port (liquid line) to the outdoor coil. The flow path of the refrigerant is then through the filter drier and heating capillary to the outdoor coil.

Failure of the slide in the check valve to seat properly in either mode of operation will cause flooding of the cooling coil. This is due to the refrigerant bypassing the heating or cooling capillary tube and entering the liquid line.

COOLING MODE

In the cooling mode of operation, liquid refrigerant from condenser (liquid line) enters the cooling check valve forcing the heating check valve shut. The liquid refrigerant is directed into the liquid dryer after which the refrigerant is metered through cooling capillary tubes to evaporator.

(Note: liquid refrigerant will also be directed through the heating capillary tubes in a continuous loop during the cooling mode).

HEATING MODE

In the heating mode of operation, liquid refrigerant from the indoor coil enters the heating check valve forcing the cooling check valve shut. The liquid refrigerant is directed into the liquid dryer after which the refrigerant is metered through the heating capillary tubes to outdoor coils. (Note: liquid refrigerant will also be directed through the cooling capillary tubes in a continuous loop during the heating mode).

24

REVERSING VALVE DESCRIPTION/OPERATION

WARNING

ELECTRIC SHOCK HAZARD

Disconnect power to the unit before servicing.

Failure to follow this warning could result in serious injury or death.

The Reversing Valve controls the direction of refrigerant flow to the indoor and outdoor coils. It consists of a pressureoperated, main valve and a pilot valve actuated by a solenoid plunger. The solenoid is energized during the heating cycle only. The reversing valves used in the PTAC system is a

2-position,4-wayvalve.

The single tube on one side of the main valve body is the high-pressureinlet to the valve from the compressor. The center tube on the opposite side is connected to the low pressure (suction) side of the system. The other two are connected to the indoor and outdoor coils. Small capillary tubes connect each end of the main valve cylinder to the “A” and “B” ports of the pilot valve. A third capillary is a common return line from these ports to the suction tube on the main valve body.Four-wayreversing valves also have a capillary tube from the compressor discharge tube to the pilot valve.

The piston assembly in the main valve can only be shifted by the pressure differential between the high and low sides

of the system. The pilot section of the valve opens and closes ports for the small capillary tubes to the main valve to cause it to shift.

NOTE: System operating pressures must be near normal before valve can shift.

TESTING THE COIL

WARNING

ELECTRIC SHOCK HAZARD

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.

The solenoid coil is an electromagnetic type coil mounted on the reversing valve and is energized during the operation of the compressor in the heating cycle.

1.Turn off high voltage electrical power to unit.

2.Unplug line voltage lead from reversing valve coil.

3.Check for electrical continuity through the coil. If you do not have continuity replace the coil.

4.Check from each lead of coil to the copper liquid line as it leaves the unit or the ground lug. There should be no continuity between either of the coil leads and ground; if there is, coil is grounded and must be replaced.

5.If coil tests okay, reconnect the electrical leads.

6.Make sure coil has been assembled correctly.

NOTE: Do not start unit with solenoid coil removed from valve, or do not remove coil after unit is in operation. This will cause the coil to burn out.

CHECKING THE REVERSING VALVE

NOTE: You must have normal operating pressures before the reversing valve can shift.

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant 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.

Check the operation of the valve by starting the system and switching the operation from “Cooling” to “Heating” and then back to “Cooling”. Do not hammer on valve.

Occasionally, the reversing valve may stick in the heating or cooling position or in the mid-position.

25

When sluggish or stuck in the mid-position,part of the discharge gas from the compressor is directed back to the suction side, resulting in excessively high suction pressure.

Should the valve fail to shift from coooling to heating, block the air flow through the outdoor coil and allow the discharge pressure to build in the system. Then switch the system from heating to cooling.

If the valve is stuck in the heating position, block the air flow through the indoor coil and allow discharge pressure to build in the system. Then switch the system from heating to cooling.

Should the valve fail to shift in either position after increasing the discharge pressure, replace the valve.

Dented or damaged valve body or capillary tubes can prevent the main slide in the valve body from shifting.

If you determing this is the problem, replace the reversing valve.

After all of the previous inspections and checks have been made and determined correct, then perform the “Touch

Test” on the reversing valve.

Reversing Valve in Heating Mode

Reversing Valve in Cooling Mode

Touch Test in Heating/Cooling Cycle

WARNING

BURN HAZARD

Certain unit components operate at temperatures hot enough to cause burns.

Proper safety procedures must be followed, and proper protective clothing must be worn.

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

The only definite indications that the slide is in the midposition is if all three tubes on the suction side of the valve are hot after a few minutes of running time.

NOTE: A condition other than those illustrated above, and on Page 31, indicate that the reversing valve is not shifting properly. Both tubes shown as hot or cool must be the same corresponding temperature.

Procedure For Changing Reversing Valve

WARNING

HIGH PRESSURE HAZARD

Sealed Refrigeration System contains refrigerant 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.

NOTICE

FIRE HAZARD

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

1.Install Process Tubes. Recover refrigerant from sealed system. PROPER HANDLING OF RECOVERED REFRIGERANT ACCORDING TO EPA REGULATIONS IS REQUIRED.

2.Remove solenoid coil from reversing valve. If coil is to be reused, protect from heat while changing valve.

3.Unbraze all lines from reversing valve.

4.Clean all excess braze from all tubing so that they will slip into fittings on new valve.

5.Remove solenoid coil from new valve.

26

6.Protectnewvalvebodyfromheatwhilebrazingwith plastic heat sink (Thermo Trap) or wrap valve body with wet rag.

7.Fit all lines into new valve and braze lines into new valve.

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 could result in serious injury or death.

8.Pressurize sealed system with a combination of R-22and nitrogen and check for leaks, using a suitable leak detector. Recover refrigerant per EPA guidelines.

9.Once the sealed system is leak free, install solenoid coil on new valve and charge the sealed system by weighing in the proper amount and type of refrigerant as shown on rating plate. Crimp the process tubes and solder the ends shut. Do not leave Schrader or piercing valves in the sealed system.

NOTE: When brazing a reversing valve into the system, it is of extreme importance that the temperature of the valve does not exceed 250°F at any time.

Wrap the reversing valve with a large rag saturated with water. “Re-wet”the rag and thoroughly cool the valve after each brazing operation of the four joints involved.

The wet rag around the reversing valve will eliminate conduction of heat to the valve body when brazing the line connection.

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 specified 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 specification and performance section for running amperage. The L.R.A. can also be found on the rating plate.

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.).

Overloads

The compressor is equipped with an external or internal overload which senses both motor amperage and winding temperature. High motor temperature or amperage heats the overload causing it to open, breaking the common circuit within the compressor.

Heat generated within the compressor shell, usually due to recycling of the motor, is slow to dissipate. It may take anywhere from a few minutes to several hours for the overload to reset.

Checking the Overload

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.

27

WARNING

BURN HAZARD

Certain unit components operate at temperatures hot enough to cause burns.

Proper safety procedures must be followed, and proper protective clothing must be worn.

Failure to follow this warning could result in moderate to serious injury.

External Overload VPAK 9, 12, 18 K Btus

With power off, remove the leads from compressor terminals. If the compressor is hot, allow the overload to cool before starting check. Using an ohmmeter, test continuity across the terminals of the external overload. If you do not have continuity; this indicates that the overload is open and must be replaced.

Internal Overload VPAK 24 K Btus

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.

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

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.

Internal Overload

Single Phase Resistance Test

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.

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 resistancefromstarttorunterminals(“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.

GROUND TEST

Use an ohmmeter set on its highest scale. Touch one lead to the compressor body (clean point of contact as a good connection is a must) and the other probe in turn to each compressor terminal. If a reading is obtained the compressor is grounded and must be replaced.

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 whenever 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 flow 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.

28

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

Sealed Refrigeration System contains refrigerant 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 fire proof materials. Have a fire extinguisher readily available. Failure to follow this notice could result in moderate to serious property damage.

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 leak detector capable of detecting HFC (Hydrofluorocarbon) refrigerant. Recover refrigerant/nitrogen mixture and repair any leaks found.

Repeat Step 8 to insure no more leaks are present.

9. Evacuatethesystemwithagoodvacuumpumpcapable of a final 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.

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.

NOTICE

NEVER, under any circumstances, charge a rotary compressor through theLOW side. Doing so would cause permanent damage to the new compressor.

29

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

Sealed Refrigeration System contains refrigerant 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 filter drier from the system.

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

ROUTINE MAINTENANCE

WARNING

ELECTRICAL SHOCK HAZARD!

Turn off electrical power before service or installation. All eletrical connections and wiring

MUST be installed by a qualified electrician and conform to the National Code and all local codes which have jurisdiction. Failure to do so can result in property damage, personal injury and/or death.

To ensure proper unit operation and life expectancy, the following maintenance procedures should be performed on a regular basis

1. Air Filter

To ensure proper unit operation, the air filters should be cleaned at least monthly, and more frequently if conditions warrant. The unit must be turned off before the filters are cleaned.

To remove the air filters, grasp the top of the filter and lift out of the front cabinet. Reverse the procedure to reinstall the filters.

Clean the filters with a mild detergent in warm water, and allow them to dry thoroughly before reinstalling.

2. Coils & Chassis

NOTE: Do not use a caustic coil cleaning agent on coils or base pan. Use a biodegradable cleaning agent and degreaser. The use of harsh cleaning materials may lead to deterioration of the aluminum fins or the coil end plates.

The indoor coil and outdoor coils and base pan should be inspected periodically (annually or semi-annually)and cleaned of all debris (lint, dirt, leaves, paper, etc.) as necessary. Under extreme conditions, more frequent cleaning may be required. Clean the coils and base pan with a soft brush and compressed air or vacuum. A pressure washer may also be used, however, you must be careful not to bend the aluminum fin pack. Use a sweeping up and down motion in the direction of the vertical aluminum fin pack when pressure cleaning coils.

Note: It is extremely important to insure that none of the electrical and/or electronic parts of the unit get wet. Be sure to cover all electrical components to protect them from water or spray.

3. Decorative Front

The decorative front and discharge air grille may be cleaned with a mild soap or detergent. Do NOT use solvents or hydrocarbon based cleaners such as acetone, naphtha, gasoline, benzene, etc., to clean the decorative front or air discharge grilles.

Use a damp (not wet) cloth when cleaning the control area to prevent water from entering the unit, and possibly damaging the electronic control

4. Fan Motor & Compressor

The fan motor & compressor and are permanently lubricated, and require no additional lubrication.

5. Wall Sleeve

Inspect the inside of the wall sleeve and drain system periodically (annually or semi-annually)and clean as required. Under extreme conditions, more frequent cleaning may be necessary. Clean both of these areas with an antibacterial and antifungal cleaner. Rinse both items thoroughly with water and ensure that the drain outlets are operating properly.

30

ELECTRICAL TROUBLESHOOTING CHART - COOLING

9K BTU, 12K BTU, & 18K BTU

NO COOLING OPERATION

Compressor runs but Blower/Fan doesn't

Yes

24V at t-statand control wiring?

Yes

Is Line Voltage present at Motor Leads?

Yes

Check Capacitor, is Capacitor Good?

Yes

Motor should run

No

No

No

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before continuing

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

check for Error

 

 

 

 

 

 

 

 

 

Insure that Fuses

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Codes, see

 

 

 

 

 

 

 

 

 

are good and/or that

 

 

 

 

 

 

electronics control

 

 

 

 

 

 

 

 

 

Circuit Breakers are

 

 

 

 

 

 

diagnostics and

 

 

 

 

 

 

 

 

on and voltage is 208/230

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

test mode, page 15

 

 

 

 

 

 

 

 

 

O.K.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Set thermostat to

 

 

 

 

Nothing operates,

 

 

 

 

 

 

 

 

 

"Cool," and the Temp.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

entire system

 

 

 

 

 

 

 

 

 

below the present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

appears dead

 

 

 

 

 

 

 

 

 

Room Temp.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

O.K.

No

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Line voltage present

 

 

 

 

 

 

 

 

 

Compressor and Fan

 

 

 

 

 

 

 

 

Fan runs but

 

 

 

Motor should now

 

 

 

 

 

at the Transformer

 

 

 

 

 

 

 

 

 

 

 

Primary

No

 

 

Compressor doesn't

No

 

operate

 

 

 

 

 

 

 

 

 

Yes

 

 

Yes

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

24 Volts at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See Refrigerant Circuit

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

“R” Terminal on board

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

diagnosis if unit still is

 

 

 

 

 

 

 

 

 

 

 

 

 

 

not cooling properly

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 Volts present at

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y terminals on

No

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

t-statand board?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

208/230 Volts present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defective t-stat

 

 

 

 

 

 

 

 

 

 

at #1 relay on board?

No

 

 

defective control wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

or transformer

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

Problems indicated

 

 

 

 

 

 

 

 

in Blower Relay

 

 

 

 

 

 

 

 

of board

 

 

Supply Circuit

 

Is Locked Rotor

 

 

 

 

problems, loose

 

 

 

 

 

 

 

 

Connections, or bad

 

Voltage a minimum of

 

 

No

 

 

 

 

Relays/Board

197 Volts?

 

Replace Capacitor

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Replace Capacitor

 

Are Capacitor and (if

 

 

 

 

 

 

 

 

 

and/or Start Assist

 

so equipped) Start

 

 

 

 

Device

No

Assist good?

 

 

 

 

 

 

 

 

 

 

Possible motor

 

 

 

 

 

 

Yes

 

problem indicated.

 

 

 

 

 

 

 

Check motor

 

 

 

 

 

 

 

 

thoroughly

 

 

 

 

 

 

 

 

 

 

Allow ample time

 

Have System

 

 

 

 

 

 

 

 

 

for pressures to

No

Pressures Equalized?

 

 

 

 

equalize

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

Possible Compressor

 

 

 

 

 

 

 

 

problem indicated.

 

Compressor should

 

 

No

 

 

 

 

See Compressor

 

run

 

 

 

 

Checks

 

 

 

 

 

 

 

 

 

 

 

Check Supply Circuit’s jumper at transformer. If okay, replace board

Problems indicated with Control Transformer replace board

Problems indicated with Room Thermostat or Control Wiring

Replace board

Yes

Compressor and fan motor should now operate

Yes

See Refrigerant Circuit Diagnosis if unit still is not cooling properly

31

ELECTRICAL TROUBLESHOOTING CHART - COOLING

24K BTU

NO COOLING OPERATION

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before continuing

 

 

 

 

 

 

 

 

check for Error

 

 

Insure that Fuses

 

 

 

 

 

 

 

 

 

Codes, see

 

 

are good and/or that

 

 

 

electronics control

 

 

Circuit Breakers are

 

 

 

diagnostics and

 

on and voltage is 208/230

 

 

 

 

 

 

 

 

 

 

 

test mode, page 15

 

 

O.K.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Compressor and outdoor fan motor run but indoor blower does not run

Yes

 

 

 

 

 

Set thermostat to

 

 

 

 

 

 

"Cool," move the Temp.

 

 

 

 

 

 

lever below the present

 

 

 

 

 

 

Room Temp.

 

 

 

 

 

 

 

O.K.

 

 

 

 

 

 

Compressor outdoor

 

 

 

Indoor blower runs but

 

 

 

 

 

 

 

fan motor and indoor

 

 

 

outdoor fan motor and

 

 

 

 

 

No

blower should now

 

 

 

compressor do not run

 

 

 

 

 

 

 

operate

 

 

 

 

Yes

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

See Refrigerant Circuit

 

 

 

 

 

 

diagnosis if unit still is

 

 

 

 

 

 

not cooling properly

 

 

 

 

 

 

 

 

 

 

Nothing operates, entire system appears dead

No Yes

Line voltage present at the Transformer Primary

Yes

24 Volts at

“R” Terminal on board

Yes

24 Volts present at Y terminals on t-statand board?

Yes

No

No

No

 

 

 

 

 

 

208/230 Volts present

 

 

24V at t-statand

 

Defective t-stat

 

 

 

at #1 relay and “OD”

 

 

 

 

 

 

terminal on board?

No

 

 

defective control wiring

 

 

 

 

control wiring?

No

 

 

 

 

 

 

 

or transformer

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

208/230 Volts present

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

at compressor’s

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

contactor?

 

 

 

 

 

 

 

 

Yes

 

 

 

Yes

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

 

Is Line Voltage present

 

 

Problems indicated

 

 

 

 

 

 

 

 

 

 

in Blower Relay

 

 

 

 

 

 

 

 

at Motor Leads?

No

 

 

 

 

 

 

 

 

 

 

 

 

of board

 

 

Supply Circuit

 

Is Locked Rotor

 

 

Yes

 

 

 

 

 

problems, loose

 

 

 

 

 

 

 

 

Connections, or bad

 

Voltage a minimum of

 

 

 

 

 

 

No

 

 

 

 

 

 

 

Relays/Board

197 Volts?

 

 

 

 

 

 

 

 

 

 

 

 

Yes

Check Capacitor, is

 

 

Replace Capacitor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Capacitor Good?

No

 

 

 

 

Replace Capacitor

 

Are Capacitor and (if

 

 

 

 

 

 

 

 

and/or Start Assist

 

so equipped) Start

 

 

Yes

 

 

 

 

 

Device

No

Assist good?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Possible motor

 

 

 

 

 

Yes

 

 

 

 

 

 

 

 

 

Motor should run

 

 

problem indicated.

 

 

 

 

 

No

 

Check motor

 

 

 

 

 

 

 

 

 

 

thoroughly

 

 

 

 

 

 

 

 

 

 

 

 

Allow ample time

 

Have System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for pressures to

No

Pressures Equalized?

 

 

 

 

 

 

 

 

equalize

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Yes

 

 

 

 

 

 

 

Possible Compressor

 

 

 

 

 

 

 

 

 

 

 

 

problem indicated.

 

Compressor should

 

 

 

 

 

 

 

No

 

 

 

 

 

 

 

See Compressor

 

run

 

 

 

 

 

 

 

 

Checks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check Supply Circuit’s jumper at transformer. If okay, replace board

Problems indicated with Control Transformer replace board

Problems indicated with Room Thermostat or Control Wiring

Replace board

Check contactor If defective replace

Compressor and outdoor fan motor should now operate

Yes

See Refrigerant

Circuit Diagnosis

if unit still is not

cooling properly

32

ELECTRICAL TROUBLESHOOTING CHART

HEAT PUMP

HEAT PUMP MODE

SYSTEM COOLS WHEN

HEATING IS DESIRED.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is Line Voltage

 

NO

Is Selector Switch

Present at

 

 

 

 

 

 

 

 

set for Heat?

Solenoid Valve?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is the Solenoid

 

NO

 

 

Replace Solenoid Coil

Coil Good?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

Reversing Valve Stuck

YES

Replace Reversing Valve

33

TROUBLESHOOTING CHART - COOLING

REFRIGERANT SYSTEM DIAGNOSIS COOLING

PROBLEM

 

PROBLEM

 

PROBLEM

 

PROBLEM

 

 

 

 

 

 

 

LOW SUCTION PRESSURE

 

HIGH SUCTION PRESSURE

 

LOW HEAD PRESSURE

 

HIGH HEAD PRESSURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Load Conditions

 

High Load Conditions

 

Low Load Conditions

 

High Load Conditions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Air Flow Across

 

High Air Flow Across

 

Refrigerant System

 

Low Air Flow Across

Indoor Coil

 

Indoor Coil

 

Restriction

 

Outdoor Coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant System

 

Reversing Valve not

 

Reversing Valve not

 

Overcharged

Restriction

 

Fully Seated

 

Fully Seated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Undercharged

 

Overcharged

 

Undercharged System

 

Non-Condensables(air)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Moisture in System

 

Defective Compressor

 

Defective Compressor

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TROUBLESHOOTING CHART - HEATING

REFRIGERANT SYSTEM DIAGNOSIS HEATING

PROBLEM

 

PROBLEM

 

PROBLEM

 

PROBLEM

 

 

 

 

 

 

 

LOW SUCTION PRESSURE

 

HIGH SUCTION PRESSURE

 

LOW HEAD PRESSURE

 

HIGH HEAD PRESSURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Low Air Flow Across

 

Outdoor Ambient Too High

 

Refrigerant System

 

Outdoor Ambient Too High

Outdoor Coil

 

for Operation in Heating

 

Restriction

 

For Operation In Heating

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refrigerant System

 

Reversing Valve not

 

Reversing Valve not

 

Low Air Flow Across

Restriction

 

Fully Seated

 

Fully Seated

 

Indoor Coil

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Undercharged

 

Overcharged

 

Undercharged

 

Overcharged

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Moisture in System

 

Defective Compressor

 

Defective Compressor

 

Non-Condensables(air)

 

 

 

in System

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

34

COOL WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VEA 09/12/18 with 2.5 KW, 3.4 KW or 5KW ELECTRIC HEAT

NOTE: THE DIAGRAM ABOVE, ILLUSTRATES THE TYPICAL THERMOSTAT WIRING FOR TWO SPEED FAN OPERATION. SEE THE UNIT CONTROL PANEL FOR THE ACTUAL UNIT WIRING DIAGRAM AND SCHEMATIC.

35

HEAT PUMP WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VHA 09/12/18 with 2.5 KW, 3.4 KW or 5KW ELECTRIC HEAT

NOTE: THE DIAGRAM ABOVE, ILLUSTRATES THE TYPICAL THERMOSTAT WIRING FOR TWO SPEED FAN OPERATION. SEE THE UNIT CONTROL PANEL FOR THE ACTUAL UNIT WIRING DIAGRAM AND SCHEMATIC.

36

COOL WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VEA 24 with 2.5 KW, 3.4 KW or 5KW ELECTRIC HEAT

37

HEAT PUMP WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VHA 24 with 2.5 KW, 3.4 KW or 5KW ELECTRIC HEAT

38

COOL WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VEA 24 with 7.5 KW and 10 KW ELECTRIC HEAT

39

HEAT PUMP WITH ELECTRIC HEAT

ELECTRICAL & THERMOSTAT WIRING DIAGRAM VHA 24 with 7.5 KW and 10KW ELECTRIC HEAT

40

 

 

 

TECHNICAL SERVICE DATA

 

 

 

 

 

 

 

 

TECHNICAL SERVICE DATA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ELECTRICAL

INDOOR COIL

 

 

 

 

 

OPERATING

Refrigerant

 

TEMPERATURE

OUTDOOR COIL

Discharge Line

Suction Line

 

 

SERVICE DATA

RATINGS

 

 

PRESSURES

Charge

 

º F

TEMPERATURE

Temperature

Temperature

Super Heat

Sub-Cooling

Cooling¹

 

 

 

 

 

 

Voltage

Amps

Supply Air

Temperature

º F

º F

º F

 

 

Suction

Discharge

R-410A- Oz.

 

 

 

 

 

 

 

Drop ¨

 

 

 

 

 

 

 

 

VEA09K**RTL

230/208

4.2

58

22

118

156

66

9

24

151

389

33.5

VEA12K**RTL

230/208

5.2

57

23

116

158

59

12

17

141

396

32.0

VEA18K**RTL

230/208

8.1

55

25

127

180

60

12

28

135

455

48.0

VEA24K**RTL

230/208

10.0

55

25

125

170

61

10

34

135

440

65.0

VHA09K**RTL

230/208

4.1

57

23

117

155

62

12

20

155

405

39.0

VHA12K**RTL

230/208

5.3

55

25

119

165

65

15

23

145

450

42.0

VHA18K**RTL

230/208

8.2

51

29

129

190

60

14

35

133

465

45.0

VHA24K**RTL

230/208

10.6

51

29

128

174

60

12

32

140

480

74.0

¹Test Conditions: 80º F, Room Air Temperature with 50% Relative Humidity, and 95º F, Outdoor Air Temperature with 40% Relative Humidity **Denotes Heater KW - Numbers Vary

41

TECHNICAL SUPPORT

CONTACT INFORMATION

FRIEDRICH AIR CONDITIONING CO.

Post Office Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212(210)357-4400·1-800-541-6645· FAX (210)357-4490www.friedrich.com

Printed in the U.S.A.

Printed in the U.S.A.

VPK-ServMan-L(1-10)

FRIEDRICH AIR CONDITIONING CO.

Post Office Box 1540 · San Antonio, Texas 78295-1540

4200 N. Pan Am Expressway · San Antonio, Texas 78218-5212(210)357-4400· FAX (210)357-4490

www.friedrich.com

Printed in the U.S.A.

VPK-ServMan-L(1-10)