Friedrich H)A09K25 User Manual

Size:
959.26 Kb
Download

Service Manual

A SERIES

Single Package

Vertical Air Conditioning System

A – H Suffix Models

MODELS

V(E,H)A09K25***

V(E,H)A09K34***

V(E,H)A09K50***

V(E,H)A12K25***

V(E,H)A12K34***

V(E,H)A12K50***

V(E,H)A18K25***

V(E,H)A18K34***

V(E,H)A18K25***

V(E,H)A24K25***

V(E,H)A24K34***

V(E,H)A24K50***

V(E,H)A24K75***

V(E,H)A24K10***

V(E,H)A24K00***

VPSERVMN (4-05)

*** Digits vary with model.

Table of Contents

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

3

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

17

Vert-I-PakModel Number Identifi cation Guide..............

4

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

18

Serial Number Identifi cation Guide .................................

4

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

18

H Suffi x Chassis Specifi cations ......................................

5

Capillary Tube Systems.................................................

19

E and G Suffi x Chassis Specifi cations............................

6

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

19

A and D Suffi x Chassis Specifi cations............................

7

Electrical Circuit And Coil..............................................

19

Sequence Of Operation...................................................

8

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

19

Electrical Supply ..............................................................

9

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

20

Supply Circuit...................................................................

9

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

20

Supply Voltage.................................................................

9

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

20

Control (Low) Voltage......................................................

9

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

21

Supply Voltage.................................................................

9

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

21

Electrical Ground .............................................................

9

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

21

Electrical Rating Tables...................................................

9

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

21

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

9

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

21

Room Thermostats ........................................................

10

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

21

Thermostat Location......................................................

10

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

21

Heat Anticipators ..........................................................

10

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

21

Electrical & Thermostat Wiring Diagrams................

11-13

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

21

Indoor Blower - Air Flow ................................................

14

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

22

Condenser Fan Motors..................................................

14

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

22

Blower Wheel Inspection...............................................

14

Capacitors......................................................................

23

Cooling...........................................................................

14

Capacitor Check With Capacitor Analyzer....................

23

Heating (Electric) ..........................................................

14

Capacitor Connections ..................................................

23

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

14

Emergency Heat Switch ................................................

24

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

15

Wiring Diagram Index ..............................................

25-26

Checking Approximate Airfl ow ......................................

15

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

39

Electric Heat Strips ........................................................

15

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

40

Airfl ow Charts ................................................................

16

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

41

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

16

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

41

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

17

Electrical Troubleshooting Chart –HeatPump .............

42

2

Introduction

This service manual is designed to be used in conjunction with the installation manuals provided with each air conditioning system component. Air conditioning systems consist of BOTH anevaporator (indoor section) and acondenser (outdoor section) in one closed system, and a room thermostat. When so equipped, accessories such as electric strip heaters are also considered part of the system.

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.)

WARNING

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

Installation or repairs made by unqualifi ed persons can result in hazards subjecting the unqualifi ed person making such repairs to the risk of injury or electrical shock which can be serious or even fatal not only to them, but also to persons being served by the equipment.

If you install or perform service on equipment, you must assume responsibility for any bodily injury or property damage which may result to you or others. Friedrich Air Conditioning Company will not be responsible for any injury or property damage arising from improper installation, service, and/or service procedures.

3

 

Model Identification Guide

 

 

 

 

 

 

 

 

 

 

 

 

MODEL NUMBER

 

V

E

A

24

K

50

RT

A

 

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Serial Number Identification Guide

 

SERIAL NUMBER

 

L

 

K

A

V

00001

 

Decade Manufactured

 

 

 

 

 

 

PRODUCTION RUN NUMBER

 

J = 9 K = Not Used

 

 

 

 

 

 

 

L = 0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PRODUCT LINE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YEAR MANUFACTURED

 

 

 

 

 

R = RAC

 

A = 1

E = 5

J = 9

 

 

 

 

 

 

P = PTAC

 

B = 2

F = 6

K = 0

 

 

 

 

 

 

E = EAC

 

C = 3

G = 7

 

 

 

 

 

 

 

V = VPAK

 

D = 4

H = 8

 

 

 

 

 

 

 

H = SPLIT

 

 

 

 

 

 

 

 

 

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

 

 

 

4

VERT-I-PAK® H SUFFIX CHASSIS SPECIFICATIONS

VEA/VHA9K-24K

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VEA09K

VEA12K

VEA18K

VEA24K

VHA09K

VHA12K

VHA18K

VHA24K

C O O L I N G D A T A

 

 

 

 

 

 

 

 

 

Cooling Btu/h

 

9500/9300

11800/11500

18000/17800

24000

9500/9300

11800/11500

18000/17800

23500

Cooling Power (W)

 

880

1093

2070

2526

905

1124

2070

2474

EER

 

10.8

10.8

8.7

9.5

10.5

10.5

8.7

9.5

Sensible Heat Ratio

 

0.74

0.72

0.70

0.70

0.74

0.72

0.70

0.70

H E A T P U M P D A

T A

 

 

 

 

 

 

 

Heating Btu/h

 

N/A

N/A

N/A

N/A

8500/8300

10600/10400

15700/15500

22500

COP @ 47°F

 

N/A

N/A

N/A

N/A

3.0

3.2

3.0

3

Heating Power (W)

 

N/A

N/A

N/A

N/A

830

971

1705

2200

Heating Current (A)

 

N/A

N/A

N/A

N/A

4.4/4.9

5.5/6.1

9.2/10.2

11.4

E L E C T R I C A L D

A T A

 

 

 

 

 

 

 

Voltage (1 Phase, 60 Hz)

 

230/208

230/208

230/208

230/208

230/208

230/208

230/208

230/208

Volt Range

 

253-198

253-198

253-198

253-198

253-198

253-198

253-198

253-198

Cooling Current (A)

 

4.1/4.3

4.9/5.3

9.2/10.2

11.2/12.4

4.2/4.4

5.0/5.5

9.2/10.2

11.2/12.4

Amps L.R.

 

21

21

47

68

21

21

47

68

Amps F.L.

 

3.7

4.5

7.9

10.2

3.7

4.5

7.9

10.2

Indoor Motor (HP)

 

1/4

1/4

1/4

1/4

1/4

1/4

1/4

1/4

Indoor Motor (A)

 

1.2

1.2

1.4

2

1.2

1.2

1.4

2

Outdoor Motor (HP)

 

N/A

N/A

N/A

1/4

N/A

N/A

N/A

1/4

Outdoor Motor (A)

 

N/A

N/A

N/A

2

N/A

N/A

N/A

2

A I R F L O W D A T A

 

 

 

 

 

 

 

 

 

Indoor CFM*

 

300

350

550

750

300

375

550

750

Vent CFM

 

60

60

60

80

60

60

60

80

Max. ESP

 

.3"

.3"

.3"

.3"

.3"

.3"

.3"

.3"

P H Y S I C A L D A T

A

 

 

 

 

 

 

 

 

Dimensions (W x D x H)

 

23 x 23 x 32

23 x 23 x 32

23 x 23 x 32

23 x 23 x 47

23 x 23 x 32

23 x 23 x 32

23 x 23 x 32

23 x 23 x 47

Net Weight (Lbs)

 

114

124

144

167

114

125

144

167

Shipping Weight (Lbs)

 

125

135

155

180

125

135

155

180

R-22Charge

 

25

29

42

68.5

23.5

27

42

63.5

* Normal Value Wet Coil @ .1" ESP.

 

 

 

 

 

 

 

 

ELECTRIC HEAT DATA

VEA/ VHA09,12

 

 

VE/VHA09

 

 

VE/VHA12

 

Heater Watts

2500/2050

3400/2780

5000/4090

2500/2050

3400/2780

5000/4090

Voltage

 

230/208

 

 

230/208

 

Heating Btu/h

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

Heating Current (Amps)

10.6/9.3

14.5/12.5

20.9/18.2

10.6/9.3

14.5/12.5

20.9/18.2

Minimum Circuit Ampacity

15

19.9

27.9

15

19.9

27.9

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

VEA/VHA18,24

 

 

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 Btu/h

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

25598/20939

34130/27918

Heating Current (Amps)

10.6/9.3

14.5/12.5

20.9/18.2

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

27.9

17.2/15.9

22.1/20.3

30.7/28.1

44.3/40.4

57.9/52.7

Branch Circuit Fuse (Amps)

15

20

30

25/25

25/25

35/30

45/45

60/60

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

5

VERT-I-PAK® E & G SUFFIX CHASSIS SPECIFICATIONS

Model

V(E,H)A09

V(E,H)A12

 

V(E,H)A18

V(E,H)A24

Voltage (V)

230 / 208

230 / 208

 

230 / 208

230 / 208

Refrigerant

R-22

R-22

 

R-22

R-22

Chassis Width

23.125"

23.125"

 

23.125"

23.125"

Chassis Depth

23.125"

23.125"

 

23.125"

23.125"

Chassis Height **

32.25"

32.25"

 

32.25"

47.25"

Shipping W x D x H

26" x 28.5" x 35.0"

26." x 28.5" x 35"

 

26" x 28.5" x 35"

26" x 28.5" x 50"

Supply Duct Collar ***

10"

10"

 

10"

10"

Drain Connection

3/4" FPT

3/4" FPT

 

3/4" FPT

3/4" FPT

Min. Circuit Amps

 

See Chassis

Nameplate

 

CFM Indoor

 

 

Page 11

 

Max. Duct ESP

.3 in. water

.3 in. water

 

.3 in. water

.3 in. water

** Height includes 2" duct collar & isolators under unit. *** Factory collar accepts 10" flex duct.

VEA/ VHA9K-24K

 

 

VEA09K

VEA12K

VEA18K

VEA24K

VHA09K

VHA12K

VHA18K

VHA24K

C O O L I N G D A T A

 

 

 

 

 

 

 

 

Cooling Btu/h

 

9500/9300

11800/11500

18000/17800

24000

9500/9300

11800/11500

18000/17800

23500

Cooling Power (W)

 

880

1093

2070

2526

905

1124

2070

2474

EER

 

10.8

10.8

8.7

9.5

10.5

10.5

8.7

9.5

Sensible Heat Ratio

 

0.74

0.72

0.70

0.70

0.74

0.72

0.70

0.70

H E A T P U M P D

A T A

 

 

 

 

 

 

 

Heating Btu/h

 

N/A

N/A

N/A

N/A

8500/8300

10600/10400

15700/15500

22500

COP @ 47°F

 

N/A

N/A

N/A

N/A

3.0

3.2

3.0

3

Heating Power (W)

 

N/A

N/A

N/A

N/A

830

971

1705

2200

Heating Current (A)

 

N/A

N/A

N/A

N/A

4.4/4.9

5.5/6.1

9.2/10.2

11.4

E L E C T R I C A L D

A T A

 

 

 

 

 

 

 

Voltage (1 Phase, 60 Hz)

 

230/208

230/208

230/208

230/208

230/208

230/208

230/208

230/208

Volt Range

 

253-198

253-198

253-198

253-198

253-198

253-198

253-198

253-198

Cooling Current (A)

 

4.1/4.3

4.9/5.3

9.2/10.2

11.2/12.4

4.2/4.4

5.0/5.5

9.2/10.2

11.2/12.4

Amps L.R.

 

21

21

47

68

21

21

47

68

Amps F.L.

 

3.7

4.5

7.9

10.2

3.7

4.5

7.9

10.2

Indoor Motor (HP)

 

1/4

1/4

1/4

1/4

1/4

1/4

1/4

1/4

Indoor Motor (A)

 

1.2

1.2

1.4

2

1.2

1.2

1.4

2

Outdoor Motor (HP)

 

N/A

N/A

N/A

1/4

N/A

N/A

N/A

1/4

Outdoor Motor (A)

 

N/A

N/A

N/A

2

N/A

N/A

N/A

2

A I R F L O W D A T A

 

 

 

 

 

 

 

 

Indoor CFM*

 

300

350

550

750

300

375

550

750

Vent CFM

 

60

60

60

80

60

60

60

80

Max. ESP

 

.3"

.3"

.3"

.3"

.3"

.3"

.3"

.3"

P H Y S I C A L D A T A

 

 

 

 

 

 

 

 

Dimensions (W x D x H)

 

23x23x32

23x23x32

23x23x32

23x23x47

23x23x32

23x23x32

23x23x32

23x23x47

Net Weight (Lbs)

 

114

124

144

167

114

125

144

167

Shipping Weight (Lbs)

 

125

135

155

180

125

135

155

180

R-22Charge

 

25

29

42

68.5

23.5

27

42

63.5

* Normal Value Wet Coil @ .1" ESP.

 

 

 

 

 

 

 

 

ELECTRIC HEAT DATA

VEA/ VHA09,12

 

 

VE/VHA09

 

 

VE/VHA12

 

Heater Watts

2500/2050

3400/2780

5000/4090

2500/2050

3400/2780

5000/4090

Voltage

 

230/208

 

 

230/208

 

Heating Btu/h

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

Heating Current (Amps)

10.6/9.3

14.5/12.5

20.9/18.2

10.6/9.3

14.5/12.5

20.9/18.2

Minimum Circuit Ampacity

15

19.9

27.9

15

19.9

27.9

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

VEA/ VHA18,24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 Btu/h

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

25598/20939

34130/27918

Heating Current (Amps)

10.6/9.3

14.5/12.5

20.9/18.2

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

27.9

17.2/15.9

22.1/20.3

30.7/28.1

44.3/40.4

57.9/52.7

Branch Circuit Fuse (Amps)

15

20

30

25/25

25/25

35/30

45/45

60/60

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

VERT-I-PAK® A- D SUFFIX CHASSIS SPECIFICATIONS

Model

V(E,H)A09

V(E,H)A12

V(E,H)A18

Voltage (V)

230 / 208

230 / 208

230 / 208

Refrigerant

R-22

R-22

R-22

Chassis Width

23.125"

23.125"

23.125"

Chassis Depth

23.125"

23.125"

23.125"

Chassis Height **

32.25"

32.25"

32.25"

Shipping W x D x H

26" x 28" x 35"

26" x 28" x 35"

26" x 28" x 35"

Supply Duct Collar ***

10"

10"

10"

Drain Connection

1/2" MPT

1/2" MPT

1/2" MPT

Drain Hose ****

12" long

12" long

12" long

Thermostat Harness

36" long

36" long

36" long

Power Cord

60" long

60" long

60" long

Min. Circuit Amps

 

See Chassis Nameplate

 

CFM Indoor

 

Page 15

 

Fan Speeds

2

2

2

Max. Duct ESP

.3 In. water

.3 In. water

.3 In. water

NOTES: ** Height includes 2" duct collar & isolators under unit. *** Factory collar accepts 10" fl ex duct.

MODELS

V(E,H)A09K25

V(E,H)A09K34

V(E,H)A09K50

V(E,H)A12K25

V(E,H)A12K34

V(E,H)A12K50

V(E,H)A18K25

V(E,H)A18K34

V(E,H)A18K50

 

 

 

 

 

 

 

 

 

 

Cooling Cap. (Btu/h)

9500/9300

9500/9300

9500/9300

11500/11300

11500/11300

11500/11300

17200/17000

17200/17000

17200/17000

Cooling Power (W)

950

950

950

1200

1200

1200

1911

1911

1911

SEER

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

10.0

Water Removal (Pts/h)

2.1

2.1

2.1

2.8

2.8

2.8

4.0

4.0

4.0

Cooling SHR

0.77

0.77

0.77

0.76

0.76

0.76

0.75

0.75

0.75

 

 

 

 

 

 

 

 

 

 

Heater Size (KW)

2.5

3.4

5.0

2.5

3.4

5.0

2.5

3.4

5.0

Heating Cap.(Btu/h)

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

8500/7000

11600/9500

17000/13900

Heating Power (W)

2500/2050

3500/2780

5000/4090

2500/2050

3500/2780

5000/4520

2500/2050

3500/2780

5000/4520

Heating Current (A)

11.9/11.2

15.9/14.6

22.6/20.6

11.9/11.2

15.9/14.6

22.6/20.6

11.9/11.2

15.9/14.6

22.6/20.6

 

 

 

 

 

 

 

 

 

 

Heating Cap.(Btu/h)

8000/7800

8000/7800

8000/7800

11200/11000

11200/11000

11200/11000

15700/15500

15700/15500

15700/15500

Heating Power (W)

950

950

950

1200

1200

1200

1830

1830

1830

Heating Current (A)

4.4/4.9

4.4/4.9

4.4/4.9

5.2/6.0

5.2/6.0

5.2/6.0

9.0/10.0

9.0/10.0

9.0/10.0

COP @ 470 F

3.0

3.0

3.0

3.0

3.0

3.0

2.4

2.4

2.4

 

 

 

 

 

 

 

 

 

 

Voltage (V)

230/208

230/208

230/208

230/208

230/208

230/208

230/208

230/208

230/208

LRA - Comp. (A)

20

20

20

26.3

26.0

26.3

45

45

45

Cooling Current (A)

4.4/4.9

4.4/4.9

4.4/4.9

5.5/6.1

5.2/6.0

5.2/6.0

7.6

7.6

7.6

MIN. Ckt. Amps (A)

15

20

30

15

20

30

15

20

30

Power Connection

 

POWER CORD

 

 

POWER CORD

 

POWER CORD WITH OPTION TO HARD WIRE

 

 

 

 

 

 

 

 

 

 

Refrigerant

R-22

R-22

R-22

R-22

R-22

R-22

R-22

R-22

R-22

Unit Width (in.)

23.125

23.125

23.125

23.125

23.125

23.125

23.125

23.125

23.125

Unit Depth (in.)

23.125

23.125

23.125

23.125

23.125

23.125

23.125

23.125

23.125

Unit Height* (in.)

32.25

32.25

32.25

32.25

32.25

32.25

32.25

32.25

32.25

Shipping Weight (lbs.)

125

125

125

135

135

135

155

155

155

 

 

 

 

 

 

 

 

 

 

Indoor CFM **

300

300

300

375

375

375

550

550

550

Fresh Air CFM**

60

60

60

60

60

60

60

60

60

Motor

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

230V, 1/4 HP

Motor Amps**

1.4

1.4

1.4

1.4

1.4

1.4

1.4

1.4

1.4

*Height includes 2" high duct collar and 5/8" isolators under unit. **Normal Value Dry Coil on High Speed @ .3" ESP.

Due to continuing research in new energy-savingtechnology, specifi cations are subject to change without notice.

Capacity rated at standard conditions: COOLING–

950F DB/750F WB outdoor, 800F DB/670F WB indoor HEATING– (reverse cycle)

470F DB/430F WB outdoor, 700F DB/600F WB indoor

7

Sequence of Operation

Agoodunderstandingofthebasicoperationoftherefrigeration 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 fl ows 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 Vert-I-Pakdesign 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 often referred to as "boiling". Since the unit's blower is 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 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

8

Electrical Supply

WARNING: Electrical shock hazard.

Turn OFF electric power at fuse box or service panel before making any electrical connections and ensure a proper ground connection is made before connecting line voltage.

All electrical connections 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 property damage, personal injury and/or death.

Supply Circuit

The system cannot be expected to operate correctly unless the system is properly connected (wired) to an adequately sized single branch circuit. Check the installation manual and/or technical data for your particular unit and/or strip heaters to determine if the circuit is adequately sized.

Electrical Rating Tables

NOTE: Use copper conductorsONLY

Wire sizes are per NEC. Check local codes for overseas applications

A through D Suffix

Units Only

250 V Receptacles and Fuse Types

AMPS

15

 

20 *

 

30

 

 

 

 

 

 

 

RECEPTACLE

 

 

 

 

 

 

 

 

 

 

 

 

 

MANUFACTURER

 

PART NUMBERS

 

 

 

 

 

 

 

 

Hubbell

5661

 

5461

 

9330

P & S

5661

 

5871

 

5930

GE

GE4069-1

GE4182-1

GE4139-3

Arrow-Hart

5661

 

5861

 

5700

 

 

 

 

 

 

 

TIME-DELAYTYPE

 

 

 

 

 

 

FUSE

15

 

20

 

30

(or HACR circuit breaker)

 

 

 

 

 

 

 

 

 

 

 

 

 

HACR — Heating, Air Conditioning, Refrigeration

* May be used for 15 Amp applications if fused for 15 Amp

Recommended branch circuit wire sizes*

Nameplate maximum circuit

AWG Wire size**

breaker size

 

15A

14

20A

12

30A

10

AWG — American Wire Gauge * Single circuit from main box

** Based on copper wire, single insulated conductor at 60°C

Supply Voltage

To insure proper operation, supply voltage to the system should be within five (5) percent (plus or minus) of listed rating plate voltage.

Control (Low) Voltage

To insure proper system operation, the transformer secondary output must be maintained at a nominal 24 volts. The control (low) voltage transformer is equipped with multiple primary voltage taps. Connecting the primary, (supply) wire to the tap (i.e., 208 and 240 volts) that most closely matches the MEASURED supply voltage will insure proper transformer secondary output is maintained.

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.

Electrical Ground

GROUNDING OF THE ELECTRICAL SUPPLY TO ALL UNITS IS REQUIRED for safety reasons.

Electrical Requirements

NOTE:

All field wiring must comply with

 

NEC and local codes. It is the

 

responsibility of the installer to

 

insure that the electrical codes are

 

met.

Wire Size

Use ONLY wiring size recommended

 

for single outlet branch circuit.

Fuse/Circuit

Use ONLY type and size fuse or

 

HACR circuit breaker

Breaker

Indicated on unit's rating plate (See

 

sample on page 6).

 

Proper current protection to the unit

 

is the responsibility of the owner.

Grounding

Unit MUST be grounded from branch

 

circuit to unit, or through separate

 

ground wire provided on permanently

 

connected units. Be sure that branch

 

circuit or general purpose outlet is

 

grounded.

Wire Sizing

Use recommended wire size given in

 

the tables below and install a single

 

branch circuit. All wiring must comply

 

with local and national codes. NOTE:

 

Use copper conductors only.

9

Room Thermostats

Room thermostats are available from several different manufacturers in a wide variety of styles. They range from the very simple Bimetallic type to the complex electronic set-backtype. In all cases, no matter how simple or complex, they are simply a switch (or series of switches) designed to turn equipment (or components) "ON" or "OFF" at the desired conditions.

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.

Location

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 fl oor 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.

Measuring Current Draw

Heat Anticipators

Heat anticipators are small resistance heaters (wired in series with the "W" circuit) and built into most electromechanical thermostats. Their purpose is to prevent wide swings in room temperature during system operation in the HEATING mode. Since they are wired in series, the "W" circuit will open if one burns out preventing heat operation.

The heat anticipator provides a small amount of heat to the thermostat causing it to cycle (turn off) the heat source just prior to reaching the set point of the thermostat. This prevents exceeding the set point.

Thermostat Location

In order to accomplish this, the heat output from the anticipator must be the same regardless of the current fl owing through it. Consequently, some thermostats have an adjustment to compensate for varying current draw in the thermostat circuits.

The proper setting of heat anticipators then is important to insure proper temperature control and customer satisfaction. A Heat anticipator that is set too low will cause the heat source to cycle prematurely possibly never reaching set point. A heat anticipator that is set too high will cause the heat source to cycle too late over shooting the set point.

The best method to obtain the required setting for the heat anticipator, is to measure the actual current draw in the control circuit ("W") using a low range (0-2.0Amps) Ammeter. After measuring the current draw, simply set the heat anticipator to match that value.

If a low range ammeter is not available, a "Clamp-on"type ammeter may be used as follows:

1.Wrap EXACTLY ten (10) turns of wire around the jaws of a clamp-ontype ammeter.

2.Connect one end of the wire to the "W" terminal of the thermostat sub-base,and the other to the "R" terminal.

3.Turn power on, and wait approximately 1 minute, then read meter.

4.Divide meter reading by 10 to obtain correct anticipator setting.

Electronic thermostats do not use a resistance type anticipator. These thermostats use a microprocessor (computer) that determines a cycle rate based on a program loaded into it at the factory.

10