Friedrich ZoneAire Premier R-32 Series User manual

1 PB
Service Manual
Standard Chassis Models (R-32 Refrigerant)
230 Volt PDH07K3SGR3, PDH09K3SGR3,
PDH12K3SGR3, PDH15K3SGR3
265 Volt PDH09R3SGR3, PDH12R3SGR3, PDH15R3SGR3
94142000_02
ZoneAire Premier® R-32 Series
PTAC
Packaged Terminal Air
Conditioners & Heat Pumps
THE EXPERTS IN ROOM AIR CONDITIONING

2 PB
INTRODUCTION 3
Important safety information 3
Personal injury or death hazards 5
Model Number Reference Guide 7
Serial Number Reference Guide 7
SPECIFICATIONS 8
7000-9000 BTU 8
12000-15000 BTU 10
Electrical Data 13
OPERATION 15
Air Flow Selection and Adjustment 15
Function and Control 16
General Knowledge Sequence Of Refrigeration 20
Refrigerant System Diagram 21
Auxiliary Controls 22
Routine Maintenance 24
TROUBLESHOOTING 25
Basic Troubleshooting 25
Diagnostic Codes 26
COMPONENT TESTING 32
Hermetic Components Check 32
Reversing Valve Description And Operation 33
Testing The Reversing Valve Solenoid Coil 34
Checking The Reversing Valve 35
Touch Test Chart : To Service Reversing Valves 36
Compressor Checks 37
Logic PCB Identification and Testing 39
Power PCB Identification and Testing 40
Testing Electric Heat 41
Unit Disassembly and Component Replacement 42
Remove Unit Front Cover 42
Replace Display PCB 43
Replace Logic PCB 44
Replace Capacitor 45
Replace Power PCB 46
Replace Indoor Blower, Motor, and Heater Element. 47
Replace Indoor Blower, Motor, and Heater Element. 48
Replace Indoor Blower, Motor, and Heater Element. 49
Replace Outdoor Fan blade and motor 50
R-32 SEALED SYSTEM REPAIR 51
General Information 51
Required Equipment 53
Refrigerant Removal, Recovery, and Evacuation 54
Component Replacement/Brazing 55
Refrigerant Charging 56
Compressor Replacement 57
Compressor Replacement -Special Procedure in Case of Compressor Burnout 58
Replace The Reversing Valve 59
WIRING DIAGRAMS 60
7K 60
9K-15K 61
INTERACTIVE PARTS VIEWER 62
ACCESSORIES 63
APPENDIX 65
Appendix 1 Reference Sheet of Celsius and Fahrenheit 65
Appendix 2 Resistance Table of Indoor Ambient Temperature Sensor (15K) 66
Appendix 3 Resistance Table of Coil Temperature Sensors (Indoor and Outdoor) and Discharge Temperature Sensor 20K) 67
WARRANTY 68
TABLE OF CONTENTS

3 PB
The information in this manual is intended for use by a qualified 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.
Maintenance is the responsibility of the owner. Failure to properly maintain or repair equipment may result in personal injury and/
or various types of property damage (fire, flood, etc.).
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.
This service manual is designed to be used in conjunction with the installation and operation
manuals provided with each air conditioning system.
This service manual was written to assist the professional service technician to quickly and
accurately diagnose and repair malfunctions.
Installation procedures are not given in this manual. They are given in the Installation/Operation
manual which can be acquired on the Friedrich website. Click the Link or scan the QR code to be
directed to the Professional page where you can locate our technical literature.
Important safety information INTRODUCTION
This symbol indicates that this appliance uses a flammable refrigerant. If the refrigerant is leaked and is exposed to an
external ignition source, there is a risk of fire.
This symbol indicates that the Operation Manual should be read carefully.
This symbol indicates that service personnel should be handling this equipment with reference to the installation manual.
This symbol indicates that information is available such as the Installation and Operation manual, or the Service Manual.
SAFETY IS IMPORTANT
We have provided many important safety messages in this manual and on your appliance. Always read and obey all safety messages.
Indicates a hazard which, if not avoided, can result in severe personal injury or death and damage to product or other
property.
Indicates a hazard which, if not avoided, can result in personal injury and damage to product or other property.
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.
NOTICE
CAUTION
WARNING
All safety messages will follow the safety alert symbol with the word “WARNING” or “CAUTION”. These words mean:
This is a safety Alert symbol. This symbol alerts you to potential hazards that can kill or hurt you and others.
Indicates property damage can occur if instructions are not followed.

4 PB
INTRODUCTION
WARNING: The manufacturer’s warranty does not cover any damage or defect to the air conditioner caused by the attachment
or use of any components, accessories or devices (other than those authorized by the manufacturer) into, onto or in conjunction with the air
conditioner. You should be aware that the use of unauthorized components, accessories or devices may adversely affect the operation of the
air conditioner and may also endanger life and property. The manufacturer disclaims any responsibility for such loss or injury resulting from
the use of such unauthorized components, accessories or devices.
WARNING: This appliance is not intended for use by persons (Including children) with reduced physical, sensory or mental
capabilities, or lack of experience and knowledge, unless they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
WARNING: The maximum altitude for this appliance is 2,000 meters(6,562 feet).
Do not use above 2,000 meters(6,562 feet).
WARNING: Electrical Shock Hazard
Disconnect all power to the unit before starting maintenance. All electrical 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, severe electrical shock or death.
WARNING: Read Installation Manual
Read this manual thoroughly prior to equipment installation or operation. It is the installer’s resposibility to properly apply
and install the equipment. Installation must be in conformance with the NFPA 70-2023 national electric code or current edition,
International Mechanic code 2021 or current edition, and any other local or national codes.
WARNING: Safety First
Do not remove, disable, or bypass this unit’s safety devices. Doing so may cause fire, injuries, or death.
WARNING: This Product uses R-32 Refrigerant
Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
The appliance shall be stored in a room without continuously operating ignition sources
(for example: open flames, an operating gas appliance or an operating electric heater.
Do not pierce or burn.
Be aware that refrigerants may not contain an odor.
WARNING: Refrigeration System under High pressure
Do not puncture, heat, expose to flame or incinerate. Only certified refrigeration technicians should service this
equipment. R32 systems operate at higher pressures than R22 equipment. Appropriate safe service and handling
practices must be used.
CAUTION: Do Not Operate Equipment During Active Stages Of
Construction
To ensure proper operation, Friedrich requires that all equipment is not operated during active construction phases. This includes active stages
of completing framing, drywalling, spackling, sanding, painting, flooring, and moulding in the equipment’s designated conditioning space. The
use of this equipment during construction could result in premature failure of the components and/or system and is in violation of our standard
warranty guidelines. The operation of newly installed equipment during construction will accelerate the commencement and/or termination of
the warranty period.
WARNING: Keep all air circulation and ventilation openings free from obstruction.
WARNING: The unit should not be in contact with any equipment that will transmit vibration to the unit. Any excessive vibration or
pulsation to the unit could result in damage to the refrigerant tubing.
Refrigerant
Safety Group
A2L

5 PB
SAFETY
FIRST
WARNING AVERTISSEMENT ADVERTENCIA
Do not remove, disable
or bypass this unit’s
safety devices. Doing so
may cause re, injuries,
or death.
Ne pas supprime, désacti-
ver ou contourner cette
l´unité des dispositifs de
sécurité, faire vous risque-
riez de provoquer le feu, les
blessures ou la mort.
No eliminar, desactivar o
pasar por alto los dispositi-
vos de seguridad de la
unidad. Si lo hace podría
producirse fuego, lesiones
o muerte.
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 qualied assistant if possible.
• Capacitors, even when disconnected from the electrical power source, retain an electrical charge potential
capable of causing electric shock or electrocution.
• Handle, discharge, and test capacitors according to safe, established, standards, and approved procedures.
• Extreme care, proper judgment, and safety procedures must be exercised if it becomes necessary to test or
troubleshoot equipment with the power on to the unit.
• Do not spray water on the air conditioning unit while the power is on.
• 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.
• Use air conditioner on a single dedicated circuit within the specied amperage rating.
• Use on a properly grounded outlet only.
• Do not cut or modify the power supply cord or remove the ground prong of the plug.
• Never operate the unit on an extension cord.
• Follow all safety precautions and use proper and adequate protective safety aids such as: gloves, goggles,
clothing, properly insulated tools, and testing equipment etc.
• Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
INTRODUCTION
Personal injury or death hazards
WARNING
ALWAYS USE INDUSTRY STANDARD PERSONAL
PROTECTIVE EQUIPMENT (PPE)

6 PB
• REFRIGERATION SYSTEM REPAIR HAZARDS:
• Use approved standard refrigerant recovering procedures and equipment to relieve high 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-acetylene torch. Direct contact with the torch’s ame or hot surfaces
can cause serious burns.
• Make certain to protect personal and surrounding property with reproof materials and have a re extinguisher
at hand while using a torch.
• Provide adequate ventilation to vent off toxic fumes, and work with a qualied assistant whenever possible.
• Always use a pressure regulator when using dry nitrogen to test the sealed refrigeration system for leaks,
ushing etc.
• 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 the sleeve, chassis, and other unit
components especially the sharp ns of the indoor and outdoor coils.
• Use proper and adequate protective aids such as: gloves, clothing, safety glasses etc.
• Failure to follow proper safety procedures and/or these warnings can result in serious injury or death.
• PROPERTY DAMAGE HAZARDS
• FIRE DAMAGE HAZARDS:
• Read the Installation/Operation Manual for the air conditioning unit prior to operating.
• Use air conditioner on a single dedicated circuit within the specied 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.
• Be extremely careful when using acetylene torch and protect surrounding property.
• Failure to follow these instructions can result in re and minor to serious property damage.
• WATER DAMAGE HAZARDS:
• Improper installation, maintenance or servicing of the air conditioner unit can result in water damage to personal
items or property.
• Insure that the unit has a sufcient pitch to the outside to allow water to drain from the unit.
• Do not drill holes in the bottom of the drain pan or the underside of the unit.
• Failure to follow these instructions can result in damage to the unit and/or minor to serious property damage.
INTRODUCTION
Personal Injury Or Death Hazards

7 PB
INTRODUCTION
This service manual is designed to be used in conjunction with the installation and operation manuals provided
with each air conditioning system.
This service manual was written to assist the professional service technician to quickly and accurately diagnose
and repair malfunctions.
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.
Model Number Reference Guide
THE EXPERTS IN ROOM AIR CONDITIONING
2023 PTAC Component Model Number Reference Guide
PDH 09 K 3 SG R3 - A
P: PTAC
D: Digital
H/E: HP or Cool only
Approximate
Cooling
BTU/HR
Voltage
K: 230/208
R: 265V
Minor
Engineering
Revision
Heater Size:
2: 2.5Kw
3: 3.5Kw
5: 5Kw
Hidden Character
Series
R32
2023 Gree R32 Model # based on SG chassis
YEAR OF MANUFACTURE
22 = 2022
23 = 2023
24 = 2024
25 = 2025
MONTH OF MANUFACTURE
01 = JANUARY
02 = FEBRUARY
03 = MARCH
04 = APRIL
05 = MAY
06 = JUNE
07 = JULY
08 = AUGUST
09 = SEPTEMBER
10 = OCTOBER
11 = NOVEMBER
12 = DECEMBER
MANUFACTURING LOCATION
NUMERIC SEQUENCE
FIRST UNIT OF EACH MONTH = 00001
17 12 M 00001
Serial Number Reference Guide

8 PB
SPECIFICATIONS
7000-9000 BTU
7k 9k 9r
Power Supply Rated Voltage V~ 230/208 230/208 265
Rated Frequency Hz 60 60 60
Phases 1 1 1
Cooling Capacity Btu/h 7400/7200 9700/9400 9800
Heating Capacity Btu/h 6000/5800 8500/8200 8600
Cooling Power Input W 570/560 800/780 810
Heating Power Input W 490/470 690/670 690
Cooling Power Current A 2.4/2.6 3.6/3.9 3.1
Heating Power Current A 2.1/2.3 3.1/3.2 2.6
Rated Input : Cooling W 680 1070 1220
Rated Input : heating W 570 930 920
Rated Input : Electric Heat W 3500 /2860
2500/2040
5050/4130,3500
/2860,2500/2040
5050/3500/2500
Rated Current: Cooling A 3.3 5.1 3.6
Rated Current : heating A 2.7 3.9 3.3
Rated Current : Electric Heat A 15.2 / 13.8
10.9/9.8"
22.0/19.9,15 .2/
13.8,10.9/9.8
19.1/13.3/9.5
EER (Btu/)/W 13.0/13.0 12.1/12.1 12.1
COP (Btu/)/W 12.3/12.3 12.3/12.3 12.5
Air Flow Volume CFM 312/282 330/282 330/282
Dehumidifying Volume Pint/h 1.69 2.11 2.11
Permissible Excessive Operating
Pressure for the Discharge Side
MPa 5.8 5.8 5.8
Permissible Excessive Operating
Pressure for the Suction Side
MPa 1.9 1.9 1.9
Maximum Allowable Pressure MPa 5.8 5.8 5.8
Metering Device Capillary Capillary Capillary
Dimension (WxHxD) inch 42 3/32 × 15
63/64 × 21 1/2
42 3/32 × 15
63/64 × 21 1/2
42 3/32 × 15
63/64 × 21 1/2
Dimension of Carton Box (LxWxH) inch 45 3/64 × 25
19/32 × 17 7/8
45 3/64 × 25
19/32 × 17 7/8
45 3/64 × 25
19/32 × 17 7/8
Dimension of Package (LxWxH) inch 45 5/32 × 25
45/64 × 18
15/32
45 5/32 × 25
45/64 × 18 15/32
45 5/32 × 25
45/64 × 18 15/32
Net Weight lb 112.5 114.7 114.7
Gross Weight lb 134.5 134.5 134.5
Refrigerant / R-32 R-32 R-32
Figure 201

9 PB
SPECIFICATIONS
7000-9000 BTU Figure 202
INDOOR
SIDE
Electric Heater Power Input W 3450/2830, 2450/2010 5000/4090,3450/
2830,2450/2010 5000/3450/2450
Electric Heater Power Current A 15.0/13.6, 10.7/9.7 21.8/19.7,15.0/
13.6,10.7/9.7 18.9/13.1/9.3
Fan Type Cross-flow Cross-flow Cross-flow
Diameter Length( DXL) mm 121×706 121×706 121×706
Cooling Speed r/min 1000/890 1060/940 1060/940
Heating Speed r/min 1000/890 1060/940 1060/940
Fan Motor Power Output W 18 21 21
Fan Motor RLA A 0.1 0.18 0.18
Fan Motor Capacitor μF 1 1.5 1.5
Evaporator Form Aluminum Fin-copper
Tube
Aluminum Fin-copper
Tube
Aluminum Fin-copper
Tube
Evaporator Pipe Diameter mm 7 7 7
Evaporator Row-fin Gap mm 3-1.4 3-1.4 3-1.4
Evaporator Coil Length
(LxDxW)" mm 698 × 242 × 38.1 699 × 248 × 38.1 699 × 248 × 38.1
Fuse Current A 3.15 3.15 3.15
Set Temperature Range ºF 61~86 61~86 61~86
Sound Pressure Level dB (A) 50/46 50/46 50/46
Sound Power Level dB (A) 60/56 60/56 60/56
Outdoor
Side
Compressor Model QXF-A056rD130 QXF-A078rD130 QXF-A078yD130
Compressor Oil FW68DA or equivalent 68SL or equivalent 68SL or equivalent
Compressor Type Rotary Rotary Rotary
Compressor LRA A 13 17 15
Compressor RLA A 2.16 3.1 3.4
Compressor Overload
Protector -- 495 689 682
Fan Type -- Axial-flow Axial-flow Axial-flow
Fan Diameter mm 349 349 349
Fan Motor Speed rpm 1340/1120 1340/1120 1340/1120
Fan Motor Power Output W 20 20 20
Fan Motor RLA A 0.21 0.3 0.3
Fan Motor Capacitor μF 2 2 1.5
Outdoor Unit Air Flow Volume CFM 471 471 471
Condenser Form Aluminum Fin-copper
Tube
Aluminum Fin-copper
Tube
Aluminum Fin-copper
Tube
Condenser Pipe Diameter mm 7 7 7
Condenser Rows-fin Gap mm 3-1.3 3-1.3 3-1.3
Condenser Coil Length
(LxDxW) mm 780 × 343 × 38.1 780 × 343 × 38.1 780×343×38.1
Cooling Operation Ambient
Temperature Range ºF 64.4~115.0 64.4~115.0 64.4~115.0
Heating Operation Ambient
Temperature Range ºF -96.4 -96.4 -96.4
Sound Pressure Level dB (A) 62/58 62/58 62/58
Sound Power Level dB (A) 72/68 72/68 72/68

10 PB
12K 12R 15K 15R
Power Supply
Rated Voltage V~ 230/208 230/208 265 265
Rated Frequency Hz 60 60 60 60
Phases 1 1 1 1
Cooling Capacity Btu/h 12100/11900 12000 14600/14200 14500
Heating Capacity Btu/h 10900/10700 10700 13800/13300 13300
Cooling Power Input W 1040/1000 1030 1400/1360 1390
Heating Power Input W 940/900 920 1310/1250 1250
Cooling Power Current A 4.6/4.9 4 6.0/6.5 5.3
Heating Power Current A 4.1/4.3 3.5 5.6/5.9 4.7
Rated Input : Cooling W 1270 1270 1890 1890
Rated Input : heating W 1130 1100 1650 1650
Rated Input : Electric Heat W
5050/ 4130
3500/ 2860
2500/2040
5050/3500/2500 5050/4130,3500/
2860,2500/2040 5050/3500/2500
Rated Current: Cooling A 6.2 4.8 8.2 7
Rated Current : heating A 5.3 4.2 7.9 6.2
Rated Current : Electric Heat A
22/19.9
15.2/13.8
10.9/9.8
19.1/13.9/9.5 22.0/19.9,15.2/
13.8,10.9/9.8 19.1/13.3/9.5
EER (Btu/)/W 11.6/11.8 11.6 10.4/10.4 10.4
COP (Btu/)/W 11.6/11.8 11.6 10.6/10.6 10.6
Air Flow Volume CFM 341/306 341/306 341/306 341/306
Dehumidifying Volume Pint/h 2.75 2.75 3.17 3.17
Permissible Excessive Operating
Pressure for the Discharge Side MPa 5.8 5.8 5.8 5.8
Permissible Excessive Operating
Pressure for the Suction Side MPa 1.9 1.9 1.9 1.9
Maximum Allowable Pressure MPa 5.8 5.8 5.8 5.8
Metering Device Capillary Capillary Capillary Capillary
Dimension (WxHxD) inch 42 3/32 × 15
63/64 × 21 1/2
42 3/32 × 15 63/64
× 21 1/2
42 3/32 × 15 63/64
× 21 1/2
42 3/32 × 15 63/64
× 21 1/2
Dimension of Carton Box (LxWxH) inch 45 3/64 × 25
19/32 × 17 7/8
45 3/64 × 25 19/32
× 17 7/8
45 3/64 × 25 19/32
× 17 7/8
45 3/64 × 25 19/32
× 17 7/8
Dimension of Package (LxWxH) inch
45 5/32 × 25
45/64 × 18
15/32
45 5/32 × 25 45/64
× 18 15/32
45 5/32 × 25 45/64
× 18 15/32
45 5/32 × 25 45/64
× 18 15/32
Net Weight lb 119.1 119.1 120.2 120.2
Gross Weight lb 141.1 141.1 142.2 142.2
Refrigerant / R-32 R-32 R-32 R-32
Refrigerant Charge oz 28.93 28.92 29.63 28.57
SPECIFICATIONS
12000-15000 BTU Figure 203

11 PB
INDOOR
SIDE
Electric Heater Power Input W 5000/4090,3450
/2830,2450/2010 5000/3450/2450 5000/4090,3450/ 2820,2450/2000 5000/3450/2450
Electric Heater Power Current A 21.8/19.7,15.0/
13.6,10.7/9.7 18.9/13.1/9.3 21.8/19.7,15.0 /13.6,10.7/9.7 18.9/13.1/9.3
Fan Type Cross-flow Cross-flow Cross-flow Cross-flow
Diameter Length( DXL) mm 121×706 121×706 121×706 121×706
Cooling Speed r/min 1130/970 1130/950 1130/970 1130/970
Heating Speed r/min 1130/970 1130/950 1130/970 1130/970
Fan Motor Power Output W 23 20 23 23
Fan Motor RLA A 0.2 0.2 0.2 0.2
Fan Motor Capacitor μF 1 1.5 1 1.5
Evaporator Form Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Evaporator Pipe Diameter mm 7 7 7 7
Evaporator Row-fin Gap mm 3-1.4 3-1.4 3-1.4 3-1.4
Evaporator Coil Length
(LxDxW)" mm 698 × 242 × 38.1 698 × 242 × 38.1 698 × 242 × 38.1 698 × 242 × 38.1
Fuse Current A 3.15 3.15 3.15 3.15
Set Temperature Range ºF 61~86 61~86 61~86 61~86
Sound Pressure Level dB (A) 53/50 53/50 53/50 53/50
Sound Power Level dB (A) 63/60 63/60 63/60 63/60
OUTDOOR
SIDE
Compressor Trademark LANDA LANDA LANDA LANDA
Compressor Oil FW68DA or
equivalent
FW68DA or
equivalent
FW68DA or
equivalent
FW68DA or
equivalent
Compressor Type Rotary Rotary Rotary Rotary
Compressor LRA. A 30 21 35.2 26
Compressor RLA A 4.5 3.3 5 6.4
"Compressor Overload Protector -- 872 855 1180 1120
Fan Type -- Axial-flow Axial-flow Axial-flow Axial-flow
Fan Diameter mm 349 349 349 349
Fan Motor Speed rpm 1550/1390 1550/1380 1550/1390 1550/1390
Fan Motor Power Output W 65 45 65 45
Fan Motor RLA A 0.52 0.4 0.52 0.4
Fan Motor Capacitor μF 2.5 2.5 2.5 2.5
Outdoor Unit Air Flow Volume CFM 565 565 588 588
Condenser Form Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Aluminum Fin-
copper Tube
Condenser Pipe Diameter mm 7 7 7 7
Condenser Rows-fin Gap mm 3-1.3 3-1.3 3-1.3 3-1.3
Condenser Coil Length (LxDxW) mm 780 × 343 × 38.1 780 × 343 × 38.1 780 × 343 × 38.1 780 × 343 × 38.1
Cooling Operation Ambient
Temperature Range ºF 64.4~115.0 64.4~115.0 64.4~115.0 55~83
Heating Operation Ambient
Temperature Range ºF -96.4 -96.4 -96.4 -96.4
Sound Pressure Level dB (A) 66/63 66/63 66/63 66/63
Sound Power Level dB (A) 76/73 76/73 76/73 76/73
SPECIFICATIONS
12000-15000 BTU Figure 204

12 PB
SPECIFICATIONS
Figure 202 (Typical Unit Components and Dimensions)
Discharge
grille
Wire screen
Outdoor
orifice
sheets
Coil tube
Accessory
outdoor
grille
Accessory
wall
sleeve
Basepan
Indoor
coil
Front
panel
PDXWS Wall Sleeve Dimensions
16” H x 42” x W x 13 ” D
Front Cover Dimensions
16” H x 42” x W x 7 ” D
Cut-out Dimensions
16 x 42
3/4
3/4
1/4 1/4

13 PB
SPECIFICATIONS
Electrical Data
Make sure the wiring is adequate for your
unit.
If you have fuses, they should be of the time delay type. Before
you install or relocate this unit, be sure that the amperage
rating of the circuit breaker or time delay fuse does not exceed
the amp rating listed in Figure E.1.1. Must be installed on a
single circuit with designated receptacle.
DO NOT use an extension cord.
The cord provided will carry the proper amount of electrical
power to the unit; an extension cord may not.
Make sure that the receptacle is compatible with
the air conditioner cord
FUSE/CIRCUIT
BREAKER
Use ONLY type and size fuse or HVAC/R
circuit breaker indicated on unit’s rating
plate. Proper current protection to the unit
is the responsibility of the owner.
Specication of fuse on the main board:
T3.15AH250V(unit: 208/230V)
T3.15A 350VAC(unit: 265V)
GROUNDING
Unit MUST be grounded from branch circuit
through service cord to unit, or through
separate ground wire provided on per-
manently connected units. Be sure that
branch circuit or general purpose outlet is
grounded. The eld supplied outlet must
match plug on service cord and be within
reach of service cord. Refer to Table 1 for
proper receptacle and fuse type. Do NOT
alter the service cord or plug. Do NOT use
an extension cord.
RECEPTACLE
The eld supplied outlet must match plug on
service cord and be within reach of service
cord. Refer to Table 1 for proper receptacle
and fuse type. Do NOT alter the service
cord or plug. Do NOT use an extension
cord.
Table 1
Voltage 230V
Receptacles and Fuse Types
265V
Amps 15 20 30 15 20 30
1.5/2.5kw
Heater Size 3.5kw 5kw 1.5/2.5kw 3.5kw 5kw
NEMA#
Receptacles
Receptacle 6-15R 6-20 R 6-30R 7-15R 7-20R 7-30R
NEMA#
Plug 6-15P 6-20P 6-30P 7-15P 7-20P 7-30P
Figure 203 (Receptacles and Fuses)
Power Cord LCDI Test (208/230v)
All Friedrich 230/208V PTAC units are shipped from the
factory with a Leakage Current Detection Interrupter (LCDI)
equipped power cord. The LCDI device meets the UL and NEC
requirements for cord connected air conditioners.
To test your power supply cord:
1. Plug power supply cord into a grounded 3 prong outlet.
2. Press RESET.
3. Press TEST (listen for click; Reset button trips and pops
out).
4. Press and release RESET
a. Listen for click; Reset button latches and remains in.
b. Check that the green indicator light is on once reset.
c. The power supply cord is
ready for operation.
NOTE: The LCDI device is
not intended to be
used as a switch.
Once plugged in, the unit will
operate normally without the
need to reset the LCDI device.
If the LCDI device fails to trip
when tested, or if the power
supply cord is damaged, it must
be replaced with a new supply
cord obtained from the product
manufacturer, and must not be
repaired.
WARNING
Electrical Shock Hazard
Make sure your electrical receptacle has the
same configuration as your air conditioner’s
plug. If different, consult a Licensed Electrician.
Do not use plug adapters.
Do not use an extension cord.
Do not remove ground prong.
Always plug into a grounded 3 prong oulet.
Failure to follow these instructions can result in
death, fire, or electrical shock.
RESET
TEST
WARNING:
TEST BEFORE EACH USE.
TO TEST:
PRESS RESET BUTTON.
PLUG LCDI INTO POWER
RECEPTACLE.
PRESS TEST BUTTON, RESET
BUTTON SHOULD POP UP.
PRESS RESET BUTTON FOR USE.
DO NOT USE IF TEST IS FAILED.
GREEN LIGHT INDICATES
PROPER OPERATION
Figure 204 (LCDI)

14 PB
SPECIFICATIONS
Electrical Data
Power Cord Installation (265v)
All 265V PTAC/PTHP units come with a factory installed non-
LCDI power cord for use in a subbase. If the unit is to be hard-
wired refer to the instructions below.
NOTE: It is recommended that the PXSB sub-base assembly, the
PXCJA conduit kit (or equivalent) be installed on all hardwired
units. If installing a flush-floor mounted unit, make sure
the chassis can be removed from the sleeve for service and
maintenance.
POWER CONNECTION OPTIONS
Appropriate power cord accessory kit is determined by the
voltage,and amperage of the branch circuit. If the unit is to be
hard wired, an accessory hard wire kit must be ordered.
IMPORTANT: For 265V units, if power cord accessory option
is selected, the cord is only 18” long and must plug into the
accessory electrical 265V subbase. Be sure that your outlet
matches the appropriate blade configuration of the plug and that
it is within reach of the service cord.
Electrical Wiring
All wiring,including installation of the receptacle, must be
in accordance with the NEC and local codes, ordinances and
regulations. National codes require the use of an arc fault or
leakage current detection device on all 208/230V power cords.
Be sure to select the correct cord for your installation.
Wire Size
Install a single branch circuit. All wiring must comply with local
and national codes. All units are designed to operate off ONE
single branch circuits only.
NOTE: Use copper conductors only. Prepare the 265V (or 230V)
power cord for connection to the chassis’ power cord connector
by cutting the cord to the appropriate length.
Grounding
For safety and protection, the unit is grounded through the service cord
plug or through separate ground wire provided on hard wired units. Be
sure that the branch circuit or general purpose outlet is grounded.
VOLTAGE SUPPLY
Check voltage supply at outlet. For satisfactory results, the voltage
range must always be within the ranges found on the data information
plate.
Cord-connected Units
The 250V- field supplied outlet must match the plug for the standard
208/ 230V- units and be within reach of the service cord. The standard
cord-connected 265V- units require an accessory electrical subbase for
operation. Refer to Figure 203 for proper receptacle and fuse type.
Power Cord Protection
The power cord for 230/ 208V units provide power cord fire protection.
Unit power automatically disconnects when unsafe conditions are
detected. Power to the unit can be restored by pressing the reset button
on plug head.
Upon completion of unit installation for 230/ 208V models,an operational
check should be performed using the TEST/RESET buttons on the plug
head.
NOTE: The 265V models do not incorporate this feature as they require
use of the electrical subbase accessory To install the line voltage power
leads and conduit to chassis, refer to the Installation and Operation
Manual.
WARNING
Electrical Shock Hazard
Make sure your electrical receptacle has the
same configuration as your air conditioner’s
plug. If different, consult a Licensed Electrician.
Do not use plug adapters.
Do not use an extension cord.
Do not remove ground prong.
Always plug into a grounded 3 prong oulet.
Failure to follow these instructions can result in
death, fire, or electrical shock.
MODEL HEATER Kw POWER CORD KIT VOLTAGE AMPERAGE RECEPTACLE
PDH07K,PDH09K
PDH12K,PDH15K 2.5 PXPC23015A 208/230 15 NEMA 6-15r
PDH07K,PDH09K
PDH12K,PDH15K 3.5 PXPC23020A (STD) 208/230 20 NEMA 6-20r
PDH09K
PDH12K,PDH15K 5.0 PXPC23030 208/230 30 NEMA 6-30r
PDH09R
PDH12R
PDH15R
2.5 PXPC26515 265 15 NEMA 7-15r
3.5 PXPC26520A (STD) 265 20 NEMA 7-20r
5.0 PXPC26530 265 30 NEMA 7-30r

15 PB
OPERATION
Air Flow Selection and Adjustment
VENTILATION CONTROL
The ventilation control lever is located at left
side of unit, behind front panel.
NOTE:The vent door shipping hardware must
be removed before using vent control lever.
See Installation Instructions.
When set at close POSITION, only the air inside
the room is circulated and filtered.
When set at open POSITION, some outdoor
air will be drawn into room. This will reduce
heating or cooling efficiency.
EnergyTip : Keep the vent control at POSITION.
Room air will be filtered and circulated. Figure J.2.1 (Ventilation Control Location)
ADJUSTING AIR DIRECTION
To adjust air direction:
1.Remove front panel.
2.Remove louver screws that hold louver insert in place (from back side of front panel). See Fig. J.2.2
3. Turn louver insert and rotate 180 See Fig. J.2.3
4.Replace louver insert.
5.Replace screws and front panel.
Louver screws
Figure J.2.2 (Backside of Front Panel)
Air discharge upward
Air discharge outward (Default)
Figure J.2.3 (Adjusting Louvers)
Vent Control
(Pull lever through label
to operate.)
Open position Close position

16 PB
OPERATION
Function and Control
Auxiliary dip switch controls are located behind front
panel, through an opening below the control panel.
To access, remove front panel.
Dip switches are accessible without opening the
control box. Unit must be powered OFF to
effectively change their status.
Factory settings for dip switches will be in the DOWN
position. See Table 5-Dip Switch Functions for
functions of each dip switch position.
Dip Switches
Figure 304 (Dipswitch Location on Unit)
Figure 305 (Dip Switches)
UP
Dow n
Dip switch
Freeze guard
Setpoint Limit 2
Setpoint Limit 1
Wall Thermostat enable
Electric heat only (for Heat Pumps ）
Table306 (DIP SWITCH FUNCTIONS)
No. UP DOWN REMARKS DEFAULT
1DOWN
2DOWN
6
*
5
UP* UP
68 ---75°F
UP* DOWN
63 ---80°F
DOWN* UP
65 ---78°F
DOWN* DOWN
61 ---86°F
(full range)
Two con figuration s (5* 6)
combine to selec t set point
range.
When set point limit set, dis-
play al ways sh ows full
range.
DOWN* DOWN
61 ---86°F
7Freeze Guard Disable Freeze Guard Enable DOWN
Electric Heat Only
Wall Thermostat Enable
Heat Pump
Control Panel Enable
For Heat Pump unit only.
Electric Heating Only/Emergency Heat (For Heat Pump Units Only)
This setting is typically used for Emergency Heating.
Wall Thermostat Enable
A wired wall thermostat can be connected to the unit. If it is, this dipswitch must be moved to the Wall
Thermostat Enable Position, before the wall thermostat will begin control.
Setpoint Temperature Limits
Provides a restricted range of temperature control.
Room Freeze Protection
If unit senses a room temperature below 40°F, the fan motor and electric strip heat will turn on and
warm the room to 50°F. The fan stops a short time after the temperature is satisfied.
12

17 PB
OPERATION
Function and Control
OPERATION
IMPORTANT : When unit is first started,high humidity conditions can cause condensation to form
on discharge grille.Keep doors and windows closed.Room humidity will decrease and moisture will
evaporate.
Fig.26–PTAC CONTROLS
17
High
Low
Auto Constant
Fan
Cool
Heat
Fan Speed Mode
Temperature
Power
ABOUT THE CONTROLS ON YOUR UNIT
NOTE:In case of a power failure,the unit will remember the last programmed settings and will
restart to those settings.
1.When the unit is in off mode, turn on the unit by Power; if pressing up/down button, dual-8
will off after indoor temperature displays for 15s; if pressing mode button, controller will resume
to related state, and operation indication lamp will on (mode button including cooling mode button,
heating mode button and fan mode button)
* Power: It will shift when the unit is Power by Power.
* Cooling mode button: when the unit is on, it will run under cooling mode; when the unit is off, press
cooling mode button, controller is on and runs under cooling mode.
* Heating mode button: when the unit is on, it will run under heating mode; when the unit is o ff, press
heating mode button, con troller is on and runs under heating mode.
* Constant Fan button: when the unit is on, it will run under fan mode; when the unit is off, press fan mode
button, controller is on and runs under fan mode.
* Low speed button: when the unit is on, low fan will be chose if pressing low fan button.
* High speed button: when the unit is on, high fan will be chose if pressing high fan button.
Auto speed button: When the unit is on, press Auto button,the unit will run at the mode automatically
adjusted according to ambient temperature.
*
*
UP/DOWN: Adjust preset temperature 61-86°F 16-30°C by UP/DOWN.
2.Every button is valid when the unit is on.
IMPORTANT : When unit is rst started, high humidity conditions can cause condensation to form on discharge grille.Keep
doors and windows closed. Room humidity will decrease and moisture will evaporate.
Figure 307 (Display)
ABOUT THE CONTROLS ON YOUR UNIT
NOTE: In case of a power failure, the unit will remember the last programmed settings and will restart to those settings.
1. When the unit is in off mode, turn on the unit by Power; if pressing up/down button, dual-8 display will turn off after indoor
temperature displays for 15 sec; if pressing mode button, controller will resume to related state, and operation indication lamp will
turn on (mode button including cooling mode button, heating mode button and fan mode button)
2. Every button is enabled when the unit is on.
• Power: Turns the unit on and off.
• Cooling mode button: when the unit is on, press the Cool button, and the unit will run under cooling mode.
• Heating mode button: when the unit is on, press the Heat button, and the unit will run under heating mode.
• Constant Fan button: when the unit is on, press the Constant Fan Button, and the unit will run under fan mode.
• Low speed button: when the unit is on, press the low fan button, and thin unit will run at low fan speed.
• High speed button: when the unit is on, press the high fan button, and thin unit will run at high fan speed.
• Auto speed button: When the unit is on, press Auto button, and the unit fan speeds will be automatically adjusted according to
ambient temperature and demand for cooling and heating.
• UP/DOWN: Adjust preset temperature 61-86°F 16-30°C by UP/DOWN.
Allocation mode will be started up if pressing the buttons of low speed and Set-point down for 5 Sec.. when the unit is on in
30 Sec.. . After entering into allocation mode, adjust temperature compensation by buttons which leads the unit in on/off
condition, and it acts after it overloads 3 Sec..; if ambient temperature changing leads the unit in on/off condition, it will act
after exit allocation mode.
Under allocation mode: Choose below 4 allocation modes by low speed button.
First Mode: Fahrenheit/Celsius display mode
The Fahrenheit/Celsius display mode will be shifted if pressing Set-point up or Set-point down.
F means Fahrenheit display mode C means Celsius display mode.
Second Mode: Adjust cooling temperature compensation value mode.
Press Set-point up/ Set-point down will increase/decrease compensation temperature 1°F(or °C).
The adjustment range of indoor ambient temperature compensation value is -6°F~+6°F(-3°C~+3°C) (cooling mode LED is on.)
Third Mode: Adjust heating temperature compensation value mode.
Press Set-point up/Set-point down will increase/decrease compensation temperature 1°F (or °C)
The adjustment range of indoor ambient temperature compensation value is -6°F~+6°F(-3°C~+3°C) (heating mode LED is on.)
The temperature compensation is default 0 and allocates different compensation value under cooling and heating mode, the
compensation value can not be adjusted under fan mode.
Forth Mode: Display shift of preset temperature and ambient temperature under heating and cooling mode. Display of preset
temperature and ambient temperature can be shifted if pressing Set-point up or Set-point down. Preset temperature display:
dual-8 displays SP, after exiting allocation mode, preset temperature will display under heating and cooling mode.
Ambient temperature display: dual-8 displays AA, after exit allocation mode, ambient temperature will display under heating
and cooling mode.

18 PB
OPERATION
Function and Control
In below situation: preset temperature will display 10 Sec.., then display ambient temperature.
1. Press mode button. (mode button includes: cooling mode button, heating mode button)
2. Energization after power off.
3. Turn off the unit after turn on unit.
4. EM off after on.
5. Adjust preset temperature by Set-point up and Set-point down.
Exiting measure of allocation mode: for above allocation mode, there is no button action if pressing mode button (including
cooling mode button, fan mode button and heating mode button) or in 30 Sec., the unit will exit allocation mode.
Electric Heating Only/Emergency Heat
This setting is typically used for Emergency Heating.
Wall Thermostat Enable
A wired wall thermostat can be connected to the unit. If it is,this dip switch must be moved to the Wall Thermostat Enable
Position, before the wall thermostat will begin control.
Set-point Temperature Limits
Provides a restricted range of temperature control.
Room Freeze Protection
If unit senses a room temperature below 40°F,the fan motor and electric strip heat will turn on and warm the room to 50°F.
The fan stops a short time after the temperature is satised.
Cooling mode Sequence of Operation
Under cooling mode, cooling mode indicator is on and the set fan speed indicator is on. Dual 8 displays set temperature.
When Tindoor amb.+Tindoor amb. compensation≥Tpreset+ 2˚F(1˚C), the unit operates under cooling. Outdoor fan and indoor fan operates in set
speed. When the starting condition of compressor is reached, outdoor fan will operate and compressor will operate 10s later.
Tindoor amb.+Tindoor amb. compensation≤Tpreset- 2˚F(1˚C), the unit sops operation. In this case, compressor and outdoor fan stop operation.
Under indoor fan cycle mode, indoor fan will stop operation after operating at set fan speed for 60s (except requiring the
indoor fan to operate in protection mode); if fan cycle mode is not selected, indoor fan will operate at set fan speed.
Tpreset - 2˚F(1˚C)<Tindoor amb.+Tindoor amb. compensation<Tpreset+ 2˚F(1˚C), the unit keeps previous operation status.
When the indoor fan is set at high speed, outdoor fan operates according to high speed.
When the indoor fan is set at low speed, outdoor fan operates according to low speed.
When the unit starts cooling mode for the rst time and indoor fan is set at low speed, outdoor fan will start at high speed.
After operating for 3.5 min. and outdoor tube temperature is below 140˚F(60˚C), outdoor fan turns to low speed. First time
start-up includes: switch to low speed cooling from non-cooling mode; the unit starts low speed cooling for the rst time or
enters low speed cooling after power failure.
During cooling mode and there is no outdoor condenser high temperature protection, unit stops when reaching temperature
point, unit stops for temperature sensor error, or unit stops for freeze protection previously, when the start-up condition of
outdoor fan is met, indoor fan will operate at high fan speed for 3 sec. and then turn to set fan speed. If high temperature
protection occurs during cooling mode, outdoor fan is forced to operate at high speed. When the start-up conditions of
outdoor fan in heating mode are met, outdoor fan will operate at high fan speed for 3 sec. and then turn to set fan speed.
When the indoor fan starts operation, indoor fan will operate at high fan speed for 3 sec. and then turn to set fan speed.
Constant fan: Press this button under cooling or heating mode to turn on or turn off constant fan function. (It is invalid in
wired controller mode) If constant fan mode is on, the fan motor will operate constantly. If constant mode is off, the fan will
stop as the load stops. Fan speed is controlled by fan speed button (If wired controller is connected, fan speed follows the
command of wired controller. The controller will control if the fan shall operate or not). The status will not change when
switching modes, turning on unit, turning off unit, switching to wired controller mode, switching to panel mode, energizing
after power failure; if operating for the rst time or memory chip is broken, it defaults to off.

19 PB
OPERATION
Function and Control
Heating mode
Under heating mode, heating mode LED and set fan speed LED is on. Dual 8 displays set temperature. If select displaying ambient
temperature in additional function setting, the dual 8 will display as the display way described in this mode. The set temperature and
fan speed will keep the same when switching modes.
Working condition and process for heating
Operation condition and process (electric heater and compressor can’t operate at the same time)
When Tpreset - 5˚F(3˚C)<Tindoor amb. -Tindoor amb. compensation≤Tpreset -2˚F(1˚C), compressor operates at heating mode. Meanwhile, the
4-way valve, indoor fan and outdoor fan start operation at set speed. Compressor can operate after 10 sec. If compressor operates
and it satisfies Tindoor amb. -Tindoor amb. compensation ≤ Tpreset - 5˚F(3˚C) and the minimum operation time for compressor and outdoor fan stop
operation immediately. 1 sec. later, electric heater will start. Once the electric heater operates, it will quit until condition is satisfied
(entering protection function is excluded).
When compressor needs to heat, if compressor can’t be started up due to protection function, electric heater will start heating
instead of compressor 15s later. It will stop operation until satisfying the temperature point (customized requirement); When Tindoor
amb. - Tindoor amb. compensation ≤Tpreset - 5˚F(3˚C),the electric heater operates. Indoor fan operates at set fan speed.
When Tindoor amb. - Tindoor amb. compensation â ‰ ¥ T preset + 2 ˚F(1˚C), compressor or electric heater stops operation.
Under fan cycle mode, indoor fan operates at the condition of blowing residual heat; if fan cycle mode is not selected, indoor
fan will operate at set fan speed.
When Tpreset - 2˚F(1˚C)<Tindoor amb.-Tindoor amb. compensation<Tpreset + 2˚F(1˚C) the unit keeps previous operation status.
Auto fan speed mode
a. Auto fan speed in cooling mode
High speed:Tamb.+Tindoor amb. compensation≥Tpreset + 4˚F(2˚C)
Low speed:Tamb. +Tindoor amb. compensation≤Tpreset
Not change:Tpreset< Tamb.+Tindoor amb. compensation< Tpreset + 4˚F(2˚C). When entering auto fan speed mode, it will operate
according to auto high speed.
b. Auto fan speed in heating mode
High speed: Tamb.-Tindoor amb. compensation ≤ Tpreset - 4˚F(2˚C)
Low speed: Tamb. -Tindoor amb. compensation ≥ Tpreset
Not change: Tpreset - 4˚F(2˚C)<Tamb.-Tindoor amb. compensation < Tpreset When entering auto fan speed mode, it will operate
according to auto high speed.
Note: a. Under auto fan speed control in any mode, there will be a delay of 3.5 min. minimum when switching the speed of
indoor fan(there is no delay of 3.5 min. when switching mode).

20 PB
OPERATION
General Knowledge Sequence Of Refrigeration
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 difcult and time consuming, if not (in
some cases) entirely impossible. The refrigeration system uses four basic principles in its operation which are as follows:
1. “Heat always 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 when a demand is received from the thermostat. 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 vapor, 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 nned surface facilitates the
transfer of heat from the refrigerant to the relatively cooler outdoor air.
When a suf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 ow across the condenser coil.
The 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 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 called 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” or atomizing. Since the unit’s blower is moving indoor air across the nned surface
of the evaporator coil, the expanding refrigerant absorbs some of that heat. This results in a lowering of the indoor air
temperature, or cooling.
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 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
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.
Suction
Line
Evaporator
Coil
Metering
Device
Refrigerant
Strainer
Discharge
Line
Condenser
Coil
Compressor
Refrigerant Drier Liquid
Line
Figure 308 (Sequence of Operation)