Friedrich H)A09K25 User Manual

Service Manual

A SERIES

Single Package Vertical Air Conditioning System A – H Sufﬁ x 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

Vert-I-Pak Model Number Identiﬁ cation Guide ..............4

Serial Number Identiﬁ cation Guide .................................4

H Sufﬁ x Chassis Speciﬁ cations ......................................5

E and G Sufﬁ x Chassis Speciﬁ cations ............................6

A and D Sufﬁ x Chassis Speciﬁ cations ............................7

Sequence Of Operation ................................................... 8

Electrical Supply ..............................................................9

Supply Circuit ...................................................................9

Supply Voltage .................................................................9

Control (Low) Voltage ......................................................9

Supply Voltage .................................................................9

Electrical Ground .............................................................9

Electrical Rating Tables ...................................................9

Undercharged Refrigerant Systems ..............................17

Overcharged Refrigerant Systems ................................18

Restricted Refrigerant Systems .....................................18

Capillary Tube Systems .................................................19

Reversing Valve — Description/Operation ...................19

Electrical Circuit And Coil ..............................................19

Testing Coil ....................................................................19

Checking Reversing Valves ...........................................20

Touch Testing Heating/Cooling Cycle ..........................20

Procedure For Changing Reversing Valve ....................20

Compressor Checks ......................................................21

Locked Rotor Voltage Test ............................................21

Single Phase Connections ...........................................21

Determine Locked Rotor Voltage .................................21

Electrical Requirements ...................................................9

Room Thermostats ........................................................10

Thermostat Location ......................................................10

Heat Anticipators ..........................................................10

Electrical & Thermostat Wiring Diagrams ................ 11-13

Indoor Blower - Air Flow ................................................14

Condenser Fan Motors ..................................................14

Blower Wheel Inspection ...............................................14

Cooling ........................................................................... 14

Heating (Electric) ..........................................................14

External Static Pressure ................................................14

Checking External Static Pressure ...............................15

Checking Approximate Airﬂ ow ...................................... 15

Electric Heat Strips ........................................................15

Locked Rotor Amperage Test ........................................21

Single Phase Running & Locked Rotor Amperage .......21

External Overload ..........................................................21

Checking the External Overload ...................................21

Checking the Internal Overload .....................................21

Compressor Single Phase Resistance Test .................22

Compressor Replacement .............................................22

Capacitors ...................................................................... 23

Capacitor Check With Capacitor Analyzer ....................23

Capacitor Connections ..................................................23

Emergency Heat Switch ................................................24

Wiring Diagram Index .............................................. 25-26

9-18 Electrical Troubleshooting Chart – Cooling .........39

2-Ton Electrical Troubleshooting Chart – Cooling .......40

Airﬂ ow Charts ................................................................16

Refrigerant Charging .....................................................16

Method Of Charging ......................................................17

Refrigerant System Diagnosis – Cooling ......................41

Refrigerant System Diagnosis – Heating ...................... 41

Electrical Troubleshooting Chart –Heat Pump .............42

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 an evaporator (indoor section) and a condenser (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 Identiﬁ cation.)

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.

Model Identiﬁ cation Guide

MODEL NUMBER V E A 24 K 50 RT A

SERIES

V=Vertical Series

E=Cooling with or without electric heat

H=Heat Pump

DESIGN SERIES

A = 32" and 47" Cabinet

NOMINAL CAPACITY

A-Series (Btu/h)

09 = 9,000

12 = 12,000

18 = 18,000

24 = 24,000

VOLTAGE

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

Serial Number Identiﬁ cation Guide

SERIAL NUMBER

L K A V 00001

Decade Manufactured

J = 9 K = Not Used L = 0

YEAR MANUFACTURED

A = 1 E = 5 J = 9 B = 2 F = 6 K = 0 C = 3 G = 7 D = 4 H = 8

PRODUCTION RUN NUMBER

PRODUCT LINE

R = RAC P = PTAC E = EAC V = VPAK H = SPLIT

EN GI NEER ING CODE

OPTIONS

RT = Stan dard Re mote Op er a tion SP = Sea coast Pro tect ed

ELECTRIC HEATER SIZE A-Series

00 = No electric heat 25 = 2.5 KW 34 = 3.4 KW 50 = 5.0 KW 75 = 7.5 KW 10 = 10 KW

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

VERT-I-PAK® H SUFFIX CHASSIS SPECIFICATIONS

VEA/VHA9K-24K

VEA09K VEA12K VEA18K VEA24K VHA09K VHA12K VHA18K VHA24K

COOLING DATA

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

HEAT PUMP DATA

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

ELECTRICAL DATA

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

AIRFLOW DATA

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"

PHYSICAL DATA

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-22 Charge 25 29 42 68.5 23.5 27 42 63.5

* Normal Value Wet Coil @ .1" ESP.

ELECTRIC HEAT DATA

VEA/VHA09,12

Heater Watts 2500/2050 3400/2780 5000/4090 2500/2050 3400/2780 5000/4090

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

Heater Watts 2500/2050 3400/2780 5000/4090 2500/2050 3400/2780 5000/4090 7500/6135 10000/8180

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

VE/VHA09 VE/VHA12

Voltage 230/208 230/208

VE/VHA18 VE/VHA24

Voltage 230/208 230/208

VERT-I-PAK

Model V(E,H)A09 V(E,H)A12 V(E,H)A18 V(E,H)A24 Voltage (V) Refrigerant Chassis Width Chassis Depth Chassis Height ** Shipping W x D x H Supply Duct Collar *** Drain Connection Min. Circuit Amps CFM Indoor Max. Duct ESP

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

E & G SUFFIX CHASSIS SPECIFICATIONS

230 / 208 230 / 208 230 / 208 230 / 208

R-22 R-22 R-22 R-22

23.125" 23.125" 23.125" 23.125"

32.25" 32.25" 32.25" 47.25"

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"

10" 10" 10" 10"

3/4" FPT 3/4" FPT 3/4" FPT 3/4" FPT

.3 in. water .3 in. water .3 in. water .3 in. water

See Chassis Nameplate

Page 11

VEA/VHA9K-24K

COOLING DATA

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

HEAT PUMP DATA

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

ELECTRICAL DATA

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

AIRFLOW DATA

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"

PHYSICAL DATA

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-22 Charge 25 29 42 68.5 23.5 27 42 63.5

* Normal Value Wet Coil @ .1" ESP.

VEA09K VEA12K VEA18K VEA24K VHA09K VHA12K VHA18K VHA24K

ELECTRIC HEAT DATA

VEA/VHA09,12

Heater Watts 2500/2050 3400/2780 5000/4090 2500/2050 3400/2780 5000/4090

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

Heater Watts 2500/2050 3400/2780 5000/4090 2500/2050 3400/2780 5000/4090 7500/6135 10000/8180

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

VE/VHA09 VE/VHA12

Voltage 230/208 230/208

VE/VHA18 VE/VHA24

Voltage 230/208 230/208

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 222 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 @ 47

Voltage (V) 230/208 230/208 230/208 230/208 230/208 230/208 230/208 230/208 230/208

LRA - Comp. (A) 2 0 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

F 3.0 3.0 3.0 3.0 3.0 3.0 2.4 2.4 2.4

*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-saving technology, 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)

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

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 difﬁ cult 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 ﬁ nned surface facilitates the transfer of heat from the refrigerant to the relatively cooler outdoor air.

When a sufﬁ cient 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 ﬂ ow across the condenser coil.

The Vert-I-Pak 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 li ne as a WAR M high press ure liquid. It nex t wil l pass throu gh 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 ﬁ nned 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 ﬂ ow 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

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 qualiﬁ ed 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 conductors ONLY Wire sizes are per NEC. Check local codes for

overseas applications

Supply Voltage

To insure proper operation, supply voltage to the system should be within ﬁ ve (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 speciﬁ ed 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.

A through D Sufﬁ x

250 V Receptacles and Fuse Types

Units Only

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-DELAY TYPE 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

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

AWG Wire size**

Electrical Requirements

NOTE: All ﬁ eld 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 w iring size r ecomme nded

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.

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-back type. 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

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.

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.

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 (0-2.0 Amps) 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-on type 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.

Typical Electrical & Thermostat Wiring Diagrams

VEA/VHA 24K

FOR 208 VOLT MODELS ONLY

MOVE THE WHITE WIRE AS

RT2

THERMOSTAT

(FRONT)

SHOWN BELOW

BLACK

COM.

208V 240V

WHITE

THERMOSTAT CONNECTIONS

(EAR)

G R

WHITE

BROWN

TERM BOARD

BROWN

YELLOW

YWRGBC

TRANSFORMER

24V

BLACK

RED

CAPACITOR

HERM

WHITE

QUICK DISCONNECT

BLACK

BLUE

COM.

TRANSFORMER

24V

208V

WHITE

240V

GREEN

SEE NOTE #6

TO MOTOR

MOUNT

WHITE

RED

BLACK

RED

BLACK

GREEN

CONDENSER

MOTOR

RED

BLACK BLUE RED

"F"

COMP WIRE HARNESS

"F"

COMPRESSOR

FAN

BLACK

BLUE

GREEN

RED

YELLOW

WHITE

123

COMPR RELAY

LOW AMBIENT

RED

BLACK

WHITE

BROWN

RED

COIL, SOLENOID

RED

BLACK

WHITE

CONTROL

WIRE NUT (RED)

WHITE

RED

PRESSURE

SWITCH

YELLOW

CAPACITOR

YELLOW

HEATER

2.5 KW & 3.4 KW 5 KW

WHITE

FAN

RELAY

2 4

1 3

BLACK

FAN

BROWN

HERM

RED

REV VALVE

RELAY

WHITE

BLUE

HEAT

RELAY

(2.5KW/3.4KW

2 4

1 3 123

BLACK

RED

GREEN

BLOWER

MOTOR

5 KW)

T-STAT DEFROST

INSULATOR

2-REQ'D

WIRE NUT (RED)

SEE NOTE #4

BLACK

TO MOTOR MOUNT

7.5 KW & 10 KW

RED

RELAY

2 4

1 3

HEATER

HEAT

(2.5KW/3.4KW

5 KW)

BLACK

RED

HEAT RELAY (7.5KW/10KW) (7.5KW/10KW)

BLACK

HEAT RELAY

NOTE: THE DIAGRAM ABOVE ILLUSTRATES THE TYPICAL THERMOSTAT WIRING AND 208

VOLT TRANSFORMER WIRING. SEE THE UNIT CONTROL PANEL FOR THE ACTUAL UNIT WIRING DIAGRAM AND SCHEMATIC.

Typical Electrical & Thermostat Wiring Diagrams

G & H Sufﬁ x

COM. 208V 240V

RT1

THERMOSTAT

(FRONT)

NOTE: THE DIAGRAM ABOVE ILLUSTRATES THE TYPICAL

THERMOSTAT WIRING AND 208 VOLT TRANSFORMER WIRING. SEE THE UNIT CONTROL PANEL FOR THE ACTUAL UNIT WIRING DIAGRAM AND SCHEMATIC.

Typical Electrical & Thermostat Wiring Diagrams

A – E Sufﬁ x

FOR 208 VOLT MODELS ONLY:

MOVE THE WHITE WIRE AS

SHOWN BELOW.

Indoor Blower - Airﬂ ow

The current Vert-I -Pak 9, 12, & 18 use a dual shaft, permanent split capacitor, single speed motor to drive indoor blower and outdoor fan. Earlier model VERT-I-Pak units used 2-speed motors. The Vert-I-Pak 24 uses an individual, single shaft, permanent split capacitor, single speed motor for the indoor blower, and a separate motor drives the outdoor fan.

Different size (HP) motors and/or different diameter blower wheels are used in different models to obtain the required airﬂ ow.

Indoor Blower - Airﬂ ow

Different size (HP) motors and/or different diameter blower wheels are used in different models to obtain the required airﬂ ow.

Condenser Fan Motors

The current Vert-I-Pak 9, 12, & 18 units use a dual shaft, permanent split capacitor, single speed motor to drive indoor and outdoor fan. Earlier models used a 2-speed motor. The Vert-I-Pak 24 uses and individual, single shaft, permanent split capacitor, single speed motor for the outdoor fan, with a separate motor driving the indoor blower.

Blower Wheel Inspection

Visually inspect the blower wheel for the accumulations of dirt or lint since they can cause reduced airﬂ ow. Clean the blower wheel of these accumulations. If accumulation cannot be removed, it will be necessary to remove the blower assembly from the unit for proper wheel cleaning.

Cooling

A nominal 400 (350-450 allowable) CFM per ton of airﬂ ow is required to insure proper system operation, capacity, and efﬁ ciency. Factory-set blower speeds should provide the proper airﬂ ow for the size (Cooling capacity) of the unit when connected to a properly sized duct system.

Cooling (VEA/VHA 24)

When the thermostat is set for cooling mode (SYSTEM switch set to COOL and FAN switch to AUTO) a rise in room temperature will make It also causes a 24-volt signal on the “Y” thermostat conductor through the high pressure and low ambient switches energizing the compressor relay, turning on the compressor and outdoor fan motor. A 24-volt signal on the “G” thermostat terminal to the Fan Relay, turning on the indoor blower motor.

Heating (Electric)

When using electric heaters, select the blower speed that provides adequate airﬂ ow across the elements to prevent overheating and cycling on limit and/or premature failure. CHECK THE EXTERNAL STATIC PRESSURE, and then consult the AIR FLOW DATA to determine the ACTUAL air ﬂ ow delivered for the factory selected fan speed. This will be especially important on change-outs using an existing duct system that may not have been properly sized to begin with.

Heating (VEA/VHA 24)

When the thermostat is set for heating mode (System switch set to HEAT and FAN switch to AUTO) it will make a 24volt signal on the “B” thermostat terminal to energize the Reversing Valve Relay. A drop in room temperature, will make a 24-volt signal on the “W” thermostat terminal to the Defrost Thermostat, and “G” thermostat terminal to the Fan Relay. The Defrost Thermostat will determine whether the unit should run in Heat Pump, or Electric Heat, based on the outdoor temperature. (See Defrost Thermostat page 24)

External Static Pressure

External Static Pressure can best be deﬁ ned 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 airﬂ ow (Friction) in the air distribution system EXTERNAL to the VERT-I-PAK cabinet.

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

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

1. Resistance to Airﬂ ow 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/Airﬂ ow to insure that the system is operating within design conditions.

Operating a system with insufﬁ cient or excessive airﬂ ow 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 air ﬂ o w s hould always be veri ﬁ e d upon co mp letion 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 airﬂ ow.

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