Sanyo KGS1411, CG1411 User Manual

REFERENCE NO. SM700361

W

TECHNICAL & SERVICE MANUAL

KGS1411 / CG1411

GAS HEATER AIR CONDITIONER

FILE NO.

Indoor Model No. Product Code No.

KGS 1411 1 852 062 56

Outdoor Model No. Product Code No.

CG 1411 1 714 734 00

Indoor Unit Outdoor Unit

Destination: U.S.A.

KGS1411 CG1411

i

IMPORTANT!
Please Read Before Starting

This air conditioning system meets strict safety and operating
standards. As the installer or service person, it is an important
part of your job to install or service the system so it operates
safely and efficiently.

For safe installation and trouble-free operation, you
must:

●

Carefully read this instruction booklet before beginning.

●

Follow each installation or repair step exactly as shown.

●

Observe all local, state, and national electrical codes.

●

Pay close attention to all warning and caution notices
given in this manual.

This symbol refers to a hazard or
unsafe practice which can result
in severe personal injury or
death.

This symbol refers to a hazard or
unsafe practice which can result
in personal injury or product or
property damage.

If Necessary, Get Help

These instructions are all you need for most installation
sites and maintenance conditions. If you require help for a
special problem, contact our sales/service outlet or your
certified dealer for additional instructions.

In Case of Improper Installation

The manufacturer shall in no way be responsible for improp­er installation or maintenance service, including failure to
follow the instructions in this document.

SPECIAL PRECAUTIONS

When Wiring

ELECTRICAL SHOCK CAN CAUSE SEVERE
PERSONAL INJURY OR DEATH. ONLY A
QUALIFIED, EXPERIENCED ELECTRICIAN
SHOULD ATTEMPT TO WIRE THIS SYSTEM.

• Do not supply power to the unit until all wiring and tubing
are completed or reconnected and checked.

• Highly dangerous electrical voltages are used in this
system. Carefully refer to the wiring diagram and these
instructions when wiring. Improper connections and
inadequate grounding can cause accidental injury or

death.

• Ground the unit following local electrical codes.

• Connect all wiring tightly. Loose wiring may cause over­heating at connection points and a possible fire hazard.

When Transporting

Be careful when picking up and moving the indoor and out­door units. Get a partner to help, and bend your knees when
lifting to reduce strain on your back. Sharp edges or thin alu­minum fins on the air conditioner can cut your fingers.

When Installing…

…In a Ceiling or Wall

Make sure the ceiling/wall is strong enough to hold the
unit’s weight. It may be necessary to construct a strong
wood or metal frame to provide added support.

…In a Room

Properly insulate any tubing run inside a room to prevent
“sweating” that can cause dripping and water damage to
walls and floors.

…In Moist or Uneven Locations

Use a raised concrete pad or concrete blocks to provide a
solid, level foundation for the outdoor unit. This prevents
water damage and abnormal vibration.

…In an Area with High Winds

Securely anchor the outdoor unit down with bolts and a
metal frame. Provide a suitable air baffle.

…In a Snowy Area (for Heat Pump-type Systems)

Install the outdoor unit on a raised platform that is higher
than drifting snow. Provide snow vents.

When Connecting Refrigerant Tubing

• Use the flare method for connecting tubing.

• Apply refrigerant lubricant to the matching surfaces of the
flare and union tubes before connecting them, then tighten
the nut with a torque wrench for a leak-free connection.

• Check carefully for leaks before starting the test run.

When Servicing

• Turn the power OFF at the main power box (mains)
before opening the unit to check or repair electrical parts
and wiring.

• Keep your fingers and clothing away from any moving
parts.

• Clean up the site after you finish, remembering to check
that no metal scraps or bits of wiring have been left inside
the unit being serviced.

Others

• Ventilate any enclosed areas when installing or testing
the refrigeration system. Escaped refrigerant gas, on con­tact with fire or heat, can produce dangerously toxic gas.

• Confirm upon completing installation that no refrigerant
gas is leaking. If escaped gas comes in contact with a
stove, gas water heater, electric room heater or other
heat source, it can produce dangerously toxic gas.

WARNING

WARNING

CAUTION

CAUTION

ii

Table of Contents

Page

1. OPERATING RANGE ................................................................................................................ 1

2. SPECIFICATIONS

2-1. Unit Specifications............................................................................................................ 2

2-2. Major Component Specifications...................................................................................... 4

2-3. Other Component Specifications...................................................................................... 7

3. DIMENSIONAL DATA

3-1. Unit................................................................................................................................... 9

3-2. Internal Components........................................................................................................ 11

3-3. Major Components........................................................................................................... 13

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram................................................................................................. 16

5. PERFORMANCE DATA

5-1. Performance Charts......................................................................................................... 17

5-2. Air Throw Distance Charts ............................................................................................... 18

5-3. Cooling Capacity .............................................................................................................. 19

5-4. Heating Capacity.............................................................................................................. 20

6. ELECTRICAL DATA

6-1. Electrical Characteristics..................................................................................................21

6-2. Electric Wiring Diagrams.................................................................................................. 22

7. INSTALLATION INSTRUCTIONS

7-1. Installation Site Selection .................................................................................................25

7-2. Recommended Wire Length and Diameter...................................................................... 27

7-3. Remote Control Unit Installation Position......................................................................... 28

8. FUNCTION

8-1. Motion Explanation........................................................................................................... 29

8-2. Cooling ............................................................................................................................. 31

8-3. Heating............................................................................................................................. 33

8-4. Fan Speed Control ...........................................................................................................37

8-5. Dry Operation (Dehumidification)..................................................................................... 38

8-6. Automatic Operation.........................................................................................................39

8-7. Freeze Prevention............................................................................................................. 40

8-8. Overload Prevention (Heating)......................................................................................... 41

9. OPERATION FLOWCHARTS

9-1. Cooling, Dry...................................................................................................................... 42

9-2. Heating............................................................................................................................. 43

iii

10. PROCEDURE FOR DISMANTLING THE UNIT

10-1. Procedure for Dismantling the Indoor Unit ....................................................................... 44

10-2. Procedure for Dismantling the Outdoor Unit..................................................................... 47

11. POINTS TO DIAGNOSE

11-1. Indoor Unit Alarm Signal .................................................................................................. 50

11-2. Manifold Pressure............................................................................................................. 50

11-3. Checking Electrical Components...................................................................................... 51

12. TROUBLESHOOTING

12-1. Check Before and After Troubleshooting.......................................................................... 53

12-2. When the Air Conditioner Does Not Work at All (Both Indoor and Outdoor Units) —

Operation Lamp Does Not Light....................................................................................... 54

12-3. Operation Lamp Blinks (It Keeps Blinking after 3 Minutes Following Start of Operation). 54

12-4. Outdoor Unit Fan Does Not Work..................................................................................... 58

12-5. Flap Motor Does Not Work............................................................................................... 59

12-6. Heating Operation Not Possible ....................................................................................... 59

12-7. Reset Method When Error Occurs During Heating Operation ......................................... 63

12-8. Failure Display on Outdoor Unit and Correction Method.................................................. 64

13. SPECIAL PRECAUTIONS WHEN SERVICING THE UNIT

13-1. BLK/WHT Connector Attachment for Servicing................................................................ 65

13-2. Refrigerant Recovery........................................................................................................ 66

13-3. Service on Outdoor Unit................................................................................................... 66

13-4. Evacuation Using Vacuum Pump ..................................................................................... 66

13-5. Refrigerant Charging........................................................................................................ 67

13-6. Reattaching BLK/WHT Connectors for Operation............................................................ 68

INSTRUCTION MANUAL

APPENDIX

1

1. OPERATING RANGE

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

Cooling Maximum 95°F (35°C) D.B. 115°F (46.1°C) D.B.

71°F (21.7°C) W.B.

Minimum 67°F (19.4°C) D.B. 67°F (19.4°C) D.B.

57°F (13.9°C) W.B.

Heating Maximum 80°F (26.7°C) D.B. 75°F (23.9°C) D.B.

67°F (19.4°C) W.B. 65°F (18.3°C) W.B.

Minimum — D.B. 0°F (–17.8°C) D.B.

— W.B. –2°F (–19°C) W.B.

2

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Remarks: Rating conditions are

Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.

Outdoor air temperature 95°F D.B. / 75°F W.B.

Heating: Indoor air temperature 70°F D.B.

Outdoor air temperature 47°F D.B. / 43°F W.B.

2. SPECIFICATIONS

2-1. Unit Specifications

Indoor unit KGS1411
Outdoor unit CG1411

Power Source Cooling Heating

Electric power source 115V 60Hz
Employed gas — Natural gas (LP)

Performance Cooling Heating

Capacity kW 2.58 4.1 / 2.9 / 1.8

8,800 14,000 / 9,900 / 6,150
Air circulation (High) ft3/min (m3/min) 282 (8.0) 300 (8.5)
Moisture removal (High) Pints/h 2.2 —

Electrical Rating Cooling Heating

Available voltage range V 104 – 126
Running amperes A 8.2 5.9
Power input W 900 620
Power factor % 95 91
SEER BTU/W 10.0 —
Compressor locked rotor amperes A 49

Features

Controls / Temperature control Microprocessor / I.C. thermostat
Control unit Wireless remote control unit
Timer ON / OFF 12 hours, 1-hour OFF
Fan speeds Indoor / Outdoor 3 and Auto / 1 (Hi)
Airflow direction (Indoor) Horizontal Manual

Vertical Auto
Air filter Washable
Compressor Rotary (Hermetic)
Refrigerant / Amount charged at shipment lb. (kg) 1.34 (0.61)
Refrigerant control Capillary tube
Operation sound Indoor: Hi / Me / Lo dB-A 39 / 37 / 34 41 / 38 / 33

Outdoor: Hi dB-A 45 43
Refrigerant tubing connections Flare
Max allowable tubing length at shipment ft. (m) 25 (7.5)
Refrigerant tubing Narrow tube inch (mm) 1/4 (6.35)
diameter Wide tube inch (mm) 3/8 (9.52)

Cooling Heating

Voltage Rating 115V

3

Dimensions & Weight Indoor Unit Outdoor Unit

Unit dimensions Height inch (mm) 10-5/8 (270) 23-7/32 (590)

Width inch (mm) 31-11/16 (805) 28-1/2 (724)

Depth inch (mm) 6-31/32 (177) 11-15/32 (291)
Package dimensions Height inch (mm) 9-13/16 (249) 31-1/16 (789)

Width inch (mm) 33-21/32 (855) 25-1/32 (636)

Depth inch (mm) 13-5/16 (338) 14-29/32 (379)
Weight Net lb. (kg) 17.6 (8.0) 85.7 (39.0)

Shipping lb. (kg) 22.0 (10.0) 90.8 (41.0)
Shipping volume cu.ft (m

3

) 2.51 (0.071) 6.72 (0.19)

Gas Consumption Natural gas LP

Typical input BTU/h (kW) High 15,500 (4.55) 15,500 (0.719 lb./h)

Medium 10,400 (3.05) 10,400 (0.482 lb./h)

Low 6,150 (1.80) 6,150 (0.285 lb./h)

Gas Nozzle Natural gas LP

Inner diameter ø inch (ø mm) 0.0807 (2.05) 0.0630 (1.60)
Q’ty 1 1

Safety Devices Cooling Heating

Re-start timer (3 minute)

●●

Compressor over-load limiting

●●

Circuit fuse

●●

Current limit function (out of range between 0.8 – 17A)

●●

Thermal fuse —

●●

Auto reset temperature limiting 221°F (105°C) —

●●

Flame rod —

●●

Governor Setting Pressure Natural gas LP

P2 P1 P2 P1

P2, P1 Inches water column (kPa) High 3.43 (0.853) 7.0 (1.74) 3.54 (0.883) 11.0 (2.74)

Medium 1.61 (0.402)

"

1.61 (0.402)

"

Low 0.63 (0.157)

"

0.63 (0.157)

"

Indoor unit KGS1411
Outdoor unit CG1411

Burner Natural gas LP

Burner type Ribbon burner
Burner configuration Slit type

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Remarks: Rating conditions are

Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.

Outdoor air temperature 95°F D.B. / 75°F W.B.

Heating: Indoor air temperature 70°F D.B.

Outdoor air temperature 47°F D.B. / 43°F W.B.

4

2-2. Major Component Specifications

2-2-1. Indoor Unit

Indoor unit KGS1411

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

Control PCB

Part No. POW-KGS14A, B
Controls Microprocessor
Control circuit fuse 115V

Flap Motor

Type Stepping motor
Model MP24GA1
Rating DC12V
Coil resistance (ambient temp. 77°F (25°C)) Ω WHT – BLU (respectively 4 wires): 380 ± 7%

Heat Exchanger Coil

Coil Aluminum plate fin / Copper tube
Rows 2
Fin pitch inch (mm) 1/16 (1.4)
Face area ft

2(m2

) 1.40 (0.130)

Fan & Fan Motor

Type Cross-flow
Q’ty … Dia. and length inch (mm) 1 … ø 95 / L617 (ø 3-3/4 / L24-9/32)
Fan motor model … Q’ty KFV4-21HIP … 1P
Nominal output W 15
Coil resistance (ambient temp. 68°F (20°C)) Ω BLU – BRN: 104.9

BLU – PNK: 128.0

Safety devices Type X23

Operating temp. Open °F (°C) 259 (126) ±4 (±2)

Close —

Run capacitor µF 3.5

VAC 180

Remote Control Unit RCS-IRS2U

5

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

2-2-2. Outdoor Unit (1)

Outdoor unit CG1411

Control PCB

Part No. CG1411
Controls Microprocessor
Control circuit fuse 115V 5A

Gas Connection

Employed gas Natural Gas (LP)
Gas connection 1/2 Female

Compressor

Type Rotary (Hermetic)
Compressor model C-1R71H2W
Nominal output W 700
Compressor oil … Amount cc SUNISO 4GSD-T … 370
Coil resistance (ambient temp. 68°F (20°C)) Ω C – R: 0.879

C – S: 3.609

Safety devices Type External (OLR)

Overload relay MRA98962-9200
Operating temp. Open °F (°C) 275 ± 9 (135 ± 5)

Close °F (°C) 156 ± 20 (69 ± 11)

Operating amp (ambient temp. 77°F (25°C))

Trip in 6 to 16 sec. at 34A

Run capacitor µF 35

VAC 330

PTC starter Part number 912X24E400XR20-PS2A

Resistance Ω 47
Max voltage 300

Crank case heater —

Fan & Fan Motor

Type Propeller
Q’ty … Dia. and length inch. (mm) 1 … 13-25/32 (ø 350)
Fan motor model … Q’ty SB6-11H1P … 1
No. of poles … rpm (115V, High) 6 … 600
Nominal output W 10
Coil resistance (ambient temp. 77°F (25°C)) Ω BLU – BRN: 114.0 ± 7%

BLU – WHT: 153.4 ± 7%

Safety devices Type Thermostat

Operating temp. Open °F (°C) 266 ± 14 (130 ± 8)

Close °F (°C) 174 ± 27 (79 ± 15) Automatic reclosing

Run capacitor µF 5.0

VAC 220

Heat Exchanger Coil

Coil Aluminum plate fin / Copper tube
Rows 1
Fin pitch inch (mm) 1/16 (1.3)
Face area ft

2(m2

) 2.73 (0.254)

External Finish Acrylic baked-on enamel finish

6

2-2-2. Outdoor Unit (2)

Outdoor unit CG1411

Burner

Type Ribbon burner
Q’ty … Material, thickness inch (mm) 1 … Stainless steel, 0.0157 (0.4)

Nozzle

Q’ty … Material 1 … Brass
Diameter ø inch (ø mm) 0.0807 (2.05 ± 0.05)

Fan & Fan Motor

Type Sirocco fan
Q’ty … Dia. and length inch (mm) 1 … ø 3.346 (85) and 0.984 (25)
Fan motor model … Q’ty FU2-051FIMP … 1
No. of poles … rpm 2 … (1,300 – 2,900)
Nominal output W 6
Coil resistance (ambient temp. 68°F (20°C)) Ω 21.3
Safety devices Type Thermal fuse

Operating temp. Open °F (°C) 293 (145)

Close —

Refrigerant Heater

Case / Coil Aluminum (collapsible forming) / Copper tube
Heat conduction face area ft2(m2) 1.83 (0.17)
Heat load × 10

–3

BTU/h • ft2(m2) 7.65 (1.3)

Combination Gas Valve

Type Combination control
Model UP13-27
Coil resistance

Valve (SV1 & SV2 for shut-off)

Ω 1600 ± 10%

Valve (PV for control) Ω 87 ± 10%

Igniter

Type Electric sparking
Model IG-XS07-S

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

7

2-3. Other Component Specifications

2-3-1. Indoor Unit

Indoor unit KGS1411

Transformer ATR-1581T2-U

Rating Primary AC 115V, 60Hz

Secondary 13.7V, 0.5A
Capacity 6.85VA

Coil resistance Ω (at 77°F (25°C)) Primary (WHT – WHT): 128 ± 20%

Secondary (BRN – BRN): 2.28 ± 20%

Thermal cut-off temp. 277°F (136°C)

Thermistor (Coil sensor) DTN-TKS118B

Resistance kΩ 32°F (0°C) 188 ± 4%

Thermistor (Room sensor) DTN-TKS134B

Resistance kΩ 77°F (25°C) 5.0 ± 3%

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

8

Auto Reset Temperature Limiting

Model CS-7L
Rating AC125V, 200mA

Thermal Fuse

Model X25
Cut-off temp. 293°F (145°C)

Transformer (TR) 4FF4L510034000

Rating Primary AC 115V, 60Hz

Secondary S1 DC 25.4V, 0.25A

S2 DC 12.6V, 0.1A
S3 AC 100V, 1Ma

Capacity 5VA

Coil resistance Ω (at 70°F (21°C)) Primary (ORG – ORG): 71.1 ± 10%

Secondary (RED – RED): 5.79 ± 10%
Secondary (BLU – BLU): 8.38 ± 10%
Secondary (YEL – YEL): 257 ± 10%

Thermal cut-off temp. 277°F (136°C)

Thermistor 1 (Discharge pressure) PB3M-41E

Resistance kΩ 122°F (50°C) 2.2 ± 5%

Thermistor 2 (Outlet refrigerant temp.) PB3M-41E

Resistance kΩ 131°F (55°C) 2.2 ± 5%

Reversing Valve CHV-01AE (Coil), CHV-0101 (Valve)

Coil rating AC115 – 120V, 50/60Hz, 6/5W
Coil resistance Ω 370

ON/OFF Valve (Q’ty = 2) NEV-MOAE (Coil), NEV-603DXF (Valve)

Coil rating AC115 – 120V, 50/60Hz, 7W
Coil resistance Ω 370

2-3-2. Outdoor Unit

Outdoor unit CG1411

Power Relay (PR) DFU24D1F

Coil rating DC 24V
Coil resistance Ω (at 68°F (20°C)) 650 ± 10%
Contact rating AC 250V, 20A

Check Valve 1 (See Refrigerant Diagram) FCV-3020D
Check Valve 2 (See Refrigerant Diagram) BCV-804DX

DATA SUBJECT TO CHANGE WITHOUT NOTICE.

9

31-11/16 (805)

10-5/8 (270)

6-31/32 (177)

3-29/32

(99.5)

2-5/16
(58.5)

1-5/8 (41.0)

1-5/8 (41.0)

Drain hose ø23/32 (18)

Narrow tube ø1/4 (6.35)

Wide tube ø3/8 (9.52)

Center of tubing
hole (2 places)

Unit: inch (mm)

6-7/32

(172.5)

Remote control unit

2-2/5

(61)

25/32
(18.5)

3. DIMENSIONAL DATA

3-1. Unit

3-1-1. Indoor Unit

Indoor unit KGS1411

10

16-23/32

4-11/16

(119) (425) (116)

4-9/16

2-9/16

(65)

9-1/16 (230)

25-31/32 (660)

10-1/4 (260)

5-21/32

(144)

2-17/32

(64)

3-5/16

(84)

2-5/32

(55)

2-21/32

(67.5)

9-1/16

24-23/32 (628)

23-7/32 (590)

10-1/4

(260)

5-5/32

(131)

2-1/4

(57)(84)

3-5/16

Holes for anchor bolts
(4-ø15/32)

Narrow tube service valve

Wide tube service valve

ø3/8 (9.52)

ø1/4 (6.35)

Wide tube service valve
ø3/8 (9.52)

Narrow tube service valve
ø1/4 (6.35)

2-13/32

(30) (230)

Unit: inch (mm)

3-1-2. Outdoor Unit

Outdoor unit CG1411

Location of Service Valves

Service valves are located behind the side panel.
See the illustration at right.

NOTE

11

3-2. Internal Components

3-2-1. Indoor Unit

Indoor unit KGS1411

Air filter

Air intake grille

Air cleaner filter

Operation selector

PCB A

PCB B

Transformer
Terminal block

Fan motor

Ground screw
Attachment plate

of the conduit

Louver motor

Wireless remote
control unit

Indicator

Cross-flow fan

Drain pan

Room temperature sensor

Flap

Heat

exchanger

Vertical flap

Refrigerant

tubing

Drain hose

Heat-exchanger
sensor

Anti-vibration rubber
for motor

12

3-2-2. Outdoor Unit

Outdoor unit CG1411

Printed
circuit board
(solid state controller)

Transformer

Capacitor
for compressor

PTC
starter

Outdoor
fan motor
capacitor

Reversing
valve

On/Off valve

Propeller
fan

Thermal
fuse

Bimetal
thermostat

Exhaust
chimney

Refrigerant
heater

Terminal
block

Thermistor 2

Thermistor 1

Flame
sensor
probe

Ignition
electrode

Gas conduit

Combustion
blower

Ignition transformer

Burner

Heat exchanger

Compressor

Accumulator

Reversing
valve

Combination
gas valve

Manual
shut-off
valve

13

3-3. Major Components

Outdoor unit CG1411
(1) Combination Gas Valve (Proportional Control Valve)

Type: Combination Gas Valve
Model: UP13-27
Material: Aluminum Die-Cast

(2) Gas Nozzle

0.945
(24)

0.906
(23)

0.708
(18)

0.590
(15)

1.417

(36)

1.948
(49.5)

0.925
(23.5)

1.433
(36.4)

2.067
(52.5)

4.913 (124.8) MAX

Proportional
control valve

Electro­magnetic
valve 2

Adjuster

Body

Electro­magnetic
valve 1

Unit: inch (mm)

Natural Gas LPG
Material Body: Aluminum Die-Cast / Nozzle: Brass
Nozzle Dia. 0.0807 inch (2.05 mm) 0.0630 inch (1.60 mm)
Figure

Unit: inch (mm)

NAT

1.15 (29.2)

LPG

1.15 (29.2)

14

(3) Main Burner

Type: Ribbon Burner
Material: Stainless Steel, Thickness: 0.0157 inch (0.4 mm)

(4) Combustion Blower

6.457 (164)

0.984 (25)

0.433 (11)

2.165 (55)

2.756 (70)

Unit: inch (mm)

5.185 (131.7)

1.578 (40)

3.764 (95.6)

1.597 (40.5)

Combustion blower fan
Outer diameter: 3-11/32

Combustion blower motor
FU2-051F1MP

Fan casing

15

(5) Refrigerant Heater

6.693 (170)

10.827 (275)

3.150 (80)

Aluminum

Copper tube
Outer dia. 5/16

Packing (both sides)
Ceramic fiber

Side wall (both sides)
Aluminum-coated
steel sheet

Refrigerant

outlet

Refrigerant

inlet

Unit: inch (mm)

16

4. REFRIGERANT FLOW DIAGRAM

4-1. Refrigerant Flow Diagram

Indoor unit KGS1411 Outdoor unit CG1411

( )

( )

Indoor unit

Wide tube

Muffler

Wide tube
service valve

Reversing
valve

Check
valve 2

Check
valve 1

ON/OFF valve 2

ON/OFF
valve 1

Accumulator Compressor

Narrow tube

Narrow tube
service valve

Capillary tube

Capillary
tube

Strainer

O.D.
3/8" (9.52 mm)

O.D.
1/4" (6.35 mm)

Heat
exchanger

Heat
exchanger

Refrigerant
heater

HEATING CYCLE

Heating
cycle

Outdoor unit

( )

( )

Indoor unit

Wide tube

Muffler

Wide tube
service valve

Reversing
valve

Check
valve 2

Check
valve 1

ON/OFF valve 2

ON/OFF
valve 1

Accumulator Compressor

Narrow tube

Narrow tube
service valve

Capillary tube

Capillary
tube

Strainer

O.D.
3/8" (9.52 mm)

O.D.
1/4" (6.35 mm)

Heat
exchanger

Heat
exchanger

Refrigerant
heater

COOLING CYCLE

Cooling
cycle

Outdoor unit

17

5. PERFORMANCE DATA

5-1. Performance Charts

Indoor unit KGS1411
Outdoor unit CG1411

● Cooling Characteristics ● Heating Characteristics

115 V

Indoor inlet air

D.B. temp. °F (°C)

12

11

10

9

8

7

6
5

70

(21.1)80(26.7)90(32.2)

100

(37.8)

110

(43.3)

120

(48.9)

Outdoor inlet air D.B. temp. °F (°C)

Operating current (A)

115 V

Indoor inlet air

D.B. temp. °F (°C)

12

11

10

9

8

7

6
5

20

(–6.6)30(–1.1)40(4.4)50(10.0)60(15.6)70(21.1)

Outdoor inlet air D.B. temp. °F (°C)

Operating current (A)

Outdoor inlet air D.B. temp. °F (°C)

(10.5)

(9.8)

(9.1)

(8.4)

(7.7)

(7.0)

(6.3)

(5.6)

(4.9)

(4.2)

(3.5)

Indoor inlet air

D.B. temp. °F (°C)

115 V

150

140

130

120

110

100

90

80

70

60

50

Low pressure psig (kg/cm

2

G)

at wide tube service valve

115 V

Outdoor inlet air D.B. temp. °F (°C)

(25.4)

(23.9)

(22.5)

(21.1)

(19.7)

(18.3)

(16.9)

(15.5)

(14.1)

(12.7)

(11.2)

360

340

320

300

280

260

240

220

200

180

160

Indoor inlet air

D.B. temp. °F (°C)

High pressure psig (kg/cm

2

G)

at wide tube service valve

10

(–12.2)

60

(15.6)

20

(–6.6)30(–1.1)40(4.4)50(10.0)60(15.6)70(21.1)

10

(–12.2)

70

(21.1)80(26.7)90(32.2)

100

(37.8)

110

(43.3)

120

(48.9)

60

(15.6)

80 (26.7)
70 (21.0)
59 (15.0)

80 (26.7)
70 (21.0)

59 (15.0)

90 (32.0)
80 (26.7)

70 (21.0)

90 (32.0)

80 (26.7)
70 (21.0)

● … Points of rating condition
Black dots in above charts indicate the following rating conditions.

Cooling: Indoor air temperature 80°F D.B. / 67°F W.B.

Outdoor air temperature 95°F D.B.

NOTE

18

5-2. Air Throw Distance Charts

Indoor unit KGS1411

Room air temp.: 80°F (27°C)
Fan speed: High

Cooling

Room air temp.: 70°F (20°C)
Fan speed: High

Heating

5

5

10

Axis air velocity (ft./sec.)

Vertical distance (ft.)

Horizontal distance (ft.)

10 15

20 25 30

15

5

: Louver angle 0°
: Louver angle 30°

5

10 15

: Axis air velocity 0°
: Axis air velocity 30°

Horizontal distance (ft.)

20 25 30

10

Axis air velocity (ft./sec.)

Vertical distance (ft.)

15

: Flap angle 45°
: Flap angle 60°

: Axis air velocity 45°
: Axis air velocity 60°

19

5-3. Cooling Capacity

Indoor unit KGS1411
Outdoor unit CG1411

115V single-phase 60Hz

TC : Total cooling capacity (BTU/h)
SHC : Sensible heat capacity (BTU/h)
CI : Compressor input (kW)

Rating conditions (# mark) are: Outdoor ambient temperature 95°F (35°C) D.B.

Indoor unit entering air temperature 80°F (26.7°C) D.B./67°F (19.4°C) W.B.

Rating Capacity: 9,000 BTU/h Air Flow Rate: 282 CFM

Evaporator Condenser

Ent. Temp. °F (°C) Ambient Temp. °F (°C)

WB DB

75 85 95 105 115

(23.9) (29.4) (35.0) (40.6) (46.1)

TC 9,120 8,680 8,170 7,610 6,980

CI 0.65 0.71 0.77 0.83 0.92

59 72 (22.2) SHC 6,750 6,530 6,280 6,010 5,710

(15.0) 76 (24.4) SHC 7,640 7,420 7,170 6,900 6,600

80 (26.7) SHC 8,570 8,350 8,100 7,610 6,980
84 (28.9) SHC 9,120 8,680 8,170 7,610 6,980
88 (31.1) SHC 9,120 8,680 8,170 7,610 6,980

TC 9,460 9,040 8,590 8,070 7,520

CI 0.65 0.72 0.78 0.85 0.94

63 72 (22.2) SHC 5,670 5,480 5,270 5,040 4,800

(17.2) 76 (24.4) SHC 6,560 6,360 6,160 5,930 5,690

80 (26.7) SHC 7,490 7,290 7,090 6,860 6,620
84 (28.9) SHC 8,370 8,180 7,980 7,750 7,510
88 (31.1) SHC 9,260 9,040 8,590 8,070 7,520

TC 9,820 9,430 # 9,000 8,520 8,000

CI 0.66 0.72 0.79 0.86 0.96

67 72 (22.2) SHC 4,580 4,420 4,240 4,050 3,840

(19.4) 76 (24.4) SHC 5,470 5,310 5,130 4,930 4,720

80 (26.7) SHC 6,400 6,240 6,060 5,860 5,650
84 (28.9) SHC 7,290 7,120 6,950 6,750 6,540
88 (31.1) SHC 8,180 8,010 7,830 7,640 7,430

TC 10,340 9,980 9,590 9,170 8,700

CI 0.67 0.73 0.8 0.88 0.98

71 72 (22.2) SHC 3,500 3,360 3,220 3,060 2,890

(21.7) 76 (24.4) SHC 4,390 4,250 4,100 3,950 3,770

80 (26.7) SHC 5,320 5,180 5,030 4,880 4,700
84 (28.9) SHC 6,210 6,070 5,920 5,760 5,590
88 (31.1) SHC 7,090 6,960 6,810 6,650 6,480

TC 10,550 10,210 9,850 9,430 8,990

CI 0.68 0.74 0.81 0.9 1

75 76 (24.4) SHC 3,230 3,110 2,990 2,850 2,700

(23.9) 80 (26.7) SHC 4,160 4,040 3,920 3,780 3,630

84 (28.9) SHC 5,050 4,930 4,810 4,660 4,520
88 (31.1) SHC 5,930 5,820 5,690 5,550 5,410

20

5-4. Heating Capacity

Indoor unit KGS1411
Outdoor unit CG1411

20 30 40

47

50 60

Outdoor temperature °F (°C) D.B.

0

10

20

30

40

50

60

70

80

90

100

110

120

Heating capacity ratio %

100

(–9.4) (–1.1) (4.4)

(8.3)

(10.0) (15.5)

(–12.2)(–17.8)

1) ● … Point of rating condition
Black dot in the chart indicates the following rating condition.

Indoor: 70°F (21.1°C) D.B.
Outdoor: 47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.

2) Above characteristics indicate instantaneous operation, which does not take into account defrost

operation.

3) Fan speed: High

4) Conventional heat pump type air conditioner may not generate enough heating capacity especially when

the outdoor temperature falls to extremely low level. Gas heater air conditioner can operate powerfully to
warm the room continuously even when the outdoor temperature becomes very low.

NOTE

21

6. ELECTRICAL DATA

6-1. Electrical Characteristics

Indoor unit KGS1411
Outdoor unit CG1411

Indoor Unit Outdoor Unit Complete Unit

Fan Motor Fan Motor Compressor
Performance at 115V Single phase 60Hz
Rating conditions Running amp. A 0.35 0.64 7.2 8.2

Power input kW 0.033 0.077 0.79 0.90

Full load conditions Running amp. A 0.35 0.64 9.0 10.0

Power input kW 0.033 0.077 0.99 1.10

Rating conditions: Indoor air temperature 80°F (26.7°C) D.B. / 67°F (19.4°C) W.B.

Outdoor air temperature 95°F (35°C) D.B.

Full load conditions: Indoor air temperature 95°F (35°C) D.B. / 70°F (21.2°C) W.B.

Outdoor air temperature 115°F (46.1°C) D.B.

Rating conditions: Indoor air temperature 70°F (21.1°C) D.B.

Outdoor air temperature 47°F (8.3°C) D.B. / 43°F (6.1°C) W.B.

Full load conditions: Indoor air temperature 80°F (26.7°C) D.B.

Outdoor air temperature 75°F (23.9°C) D.B. / 65°F (18.3°C) W.B.

Indoor Unit Outdoor Unit Complete Unit

Fan Motor Fan Motor Compressor
Performance at 115V Single phase 60Hz
Rating conditions Running amp. A 0.35 0.64 4.9 5.9

Power input kW 0.033 0.077 0.51 0.62

Full load conditions Running amp. A 0.35 0.64 5.8 6.8

Power input kW 0.033 0.077 0.61 0.72

Heating

Cooling

22

6-2. Electric Wiring Diagrams

(1) Indoor unit KGS1411

WARNING

To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.

1
2
3
4
5
6
7
8

1
2

121

2

131

3

121

2

3

1
2
3

1
2
3

1
3
5

1
3
5

4
5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

1
2
3
4
5

6
7
8

123456789

10 11

123456789

10 11

1
2
3
4
5
6
7
8

1
2
3
4
5
6
7
8

1
2
3
4

G

Fan motor

G

P

S

FM

Connector

Flap motor

Flap
5P (GRN)

Hole IC
3P (WHT)

DC-CONT 11P (WHT)

DC-CONT 11P (WHT)

Power relay

AC out

Coil

2P (WHT)

Lamp

8P (WHT)

Fan
5P (WHT)

Trans 2

2P (RED)

RV

COM

Trans 1

3P (WHT)

Coil thermistor

FLP

WHT

PNK
BRN

BLU

Controller (A)

Controller (B)

BLK

GRY

Lamp (WHT)

IND LAMP ASSY

GRY

GRY

WHT

GRY

GRY

GRY

WHT

BRN

BRN

Power transformer

Terminal base (4P)

WHT

WHT

COM
CM ON
AC115V
RV ON

GND

WHT

BLU

BLK

To outdoor unit

RED

BLK

BLU
BLU
BLU

GRN

YEL

BLK

RED

BLU

3

4

23

(2) Outdoor unit CG1411

WARNING

To avoid electrical shock hazard, be sure to
disconnect power before checking, servicing
and/or cleaning any electrical parts.

Reversing

valve

Combustion

motor

ON/OFF

Valve 1

ON/OFF

Valve 2

Ignition

transformer

Gas

valve 1

Gas

valve 2

Fan motor

Terminal

block

(BLU)

CN02

(GRN)

CN05

D

(BLK)

CN04

E

(BLK)

CN15

(GRY)

CN06

F

(RED)

CN07

G

(RED)

CN16

(WHT)

CN09

I

(WHT)

CN08

(WHT)

CN01

(WHT)

CN12

(WHT)

CN10A

(WHT)

CN10B

(WHT)

CN11

(WHT)

CN14

(YEL)

CN03

Power relay (K07)

Flame rod

Bimetal

thermostat

Power

transformer

Proportional

control valve

Thermal fuse

Thermistor 2

Thermistor 1

Compressor

Overload

protector

Start

relay

PNK

WHT

BLK

CN19

LD5

LD4

LD3

LD2

LD1

IC9

ICI

SWI

BRN

BLU

BRN

BLK

BLK

BLU

BLU

BLU

BLU

YEL

YEL

BLU

BLU

WHT

WHT

WHT

WHT

WHT

RED

RED

RED

RED

WHT

BLK BLK

PNK

BLK

BLK

BLK

BLK

ORG

ORG

ORG

ORG

WHT

WHT

VR1 VR2

FOI

C

B

FM

BLK

BLK

SV

GV1

GV2

PUR

PUR

BM

BLK
BLK

RV1

BLK

BLK

RV2

RED
RED

IG

H

J

P

Q1

Q2

N

0

K

M

CN17

W

R

R

S

PV

12345

6

C

CM

V

24

(3) Printed circuit board POW-CG1411

K04

C101

K06

K03

K01

CN08

D11

CN06 CN07 CN09

D09

CN04CN05

F01

Z01

FUSE 250V/5A

FL

GND

J37

C09

C01

K07

K02

D10

D14

D16

D12

Q04

TR1

R60

D13

R72

R70

R09

L01

R07

R10

R84

R37

R36

R35

R34

R33

LD1

LD5

R78

R23

Q07

R30

R102

R100

R101

R46

R54

OSC

R51

C104

R25

R65R66

R52

R81

R17

R16

–

+

VR2

HIGH

R104

R19

R18

R103

R15

R29

Q03

R80

Q05

R28

R32

R68

R67

R20

R14

R12

R73

R74 R75

R76

R79

R50

D07

R26

R27

R24

R40

R59

R82

R22

D05

D01

CN17

D04

D17

IC9

IC8

C13

C29

R21

J11

IC1

RA1

J20

J22

J32

J33

R69

REG1

R71

R48

R106

R13

J19

J21

J24

J23

J25

J26

R31

C102

C10

C20

J09

J08

J07

J27

J28

J29

J30

IC3

SD1

IC2

IC5

IC7

PC2

PC1

PC3

IC6

+

+

_

13

CN10B

CN11CN14

D03

13

CN12

12

CN10A

14

CN03

CN01

CN19

13

CN02

13

R06

ABS1

R04

R03

R02

R01

K05

D15

J36

Z02

R105

J18

C05

C06

C24L03

C07

C03

C27

C02

C04

Q02

HS2

HS1

J16

J15

J06

J04

J05

J35

J34

J01

J02

SW1

C28

C11

C16

C14

C21

C105

C100

D02

SD2

SD3

+

–

+

–

+

–

+

–

J17

C14

C15

CN15CN16

CN21

C32

R53

C25

C22

R63

R57
R83

R47

R49

R64

C18

C17

R39

R41

R38

R56

R55

C31

C12

C08

C19

L02

–

+

VR1

LO

J14

Q06

C33

J13

J03

J12

C26

D06

D100

D08

J10

R58

J31

C103

LO/HIGH

LD4

LD3

LD2

98

4FF4B10002710-2

TD-T13VXX

25

7. INSTALLATION INSTRUCTIONS

7-1. Installation Site Selection

7-1-1. Indoor Unit

AVOID:

● direct sunlight.

● nearby heat sources that may affect performance of

the unit.

● areas where leakage of flammable gas may be

expected.

● places where large amounts of oil mist exist.

DO:

● select an appropriate position from which every cor-

ner of the room can be uniformly cooled. (High on a
wall is best.)

● select a location that will hold the weight of the unit.

● select a location where tubing and drain hose have

the shortest run to the outside.

● allow room for operation and maintenance as well as

unrestricted air flow around the unit. (Fig. 1)

● install the unit within the maximum elevation differ-

ence (H) above the outdoor unit and within a total
tubing length (L) from the outdoor unit as detailed in
Table 1 and Fig. 2.

Table 1

2"(5 cm)

min.

2"(5 cm)

min.

2"(5 cm) min.

Front View

Fig. 1

INDOOR
UNIT

Tubing length (L)

OUTDOOR
UNIT

Elevation
difference (H)

Fig. 2

WARNING

To prevent abnormal heat
generation and the possibility
of fire, do not place obsta­cles, enclosures and grilles
in front of or surrounding the
air conditioner in a way that
may block air flow.

Indoor unit

Floor level

Wall

Minimum height

from floor level

5 ft. (1.5 m)

Fig. 3

For stable operation of
the air conditioner, do not
install wall-mounted type
indoor units under 5 ft.
(1.5 m) from floor level.

CAUTION

Max. Allowable Tubing Min. Allowable Tubing Limit of Tubing Limit of Elevation Required Amount of

Model Length at Shipment Length at Shipment Length (L) Difference (H) Additional Refrigerant

ft. (m) ft. (m) ft. (m) ft. (m) oz./ft. (g/m)*

CG1411 25 (7.5) 13 (4) 49 (15) 23 (7) 0.27 (15)

* If total tubing length becomes 25 to 49 ft. (7.5 to 15 m) (max.), charge additional refrigerant (R22) by 0.27 oz./ft. (15 g/m).

No additional compressor oil is necessary.









26

7-1-2. Outdoor Unit

AVOID:

● heat sources, exhaust fans, etc. (Fig. 4)

● damp, humid or uneven locations.

DO:

● choose a place as cool as possible.

● choose a place that is well ventilated.

● allow enough room around the unit for air intake/

exhaust and possible maintenance. (Fig. 5a)

Outdoor unit

Hot air

Heat source

Exhaust fan

NO

Fig. 4

CAUTION

● Install the outdoor unit above snowfall line.

● Do not place objects on or sit on the outdoor

unit. Also, never block the air intake/outlet or
exhaust. Distortion of the outdoor unit or
incomplete combustion may result.

● Touching the air exhaust can cause a burn.

Take special care for children not to touch it.

● Do not introduce foreign matter into the air

intake/outlet or exhaust. Do not insert point­ed objects, such as sticks.

● When the ambient temperature is dropping, a

white cloud or fog may be seen blowing from
the unit. This does not indicate a problem.

● The distance between any building opening*

and the exhaust must be 24 in. (60 cm) or
more.

● Locate the outdoor unit away from windows

to avoid possible entry of exhaust gases into
the building. Pay special attention to the win­dows of a neighboring house or building.

● If there is a window within 24 in. (60 cm) of

the exhaust, make sure it is not located
inside the projected exhaust area within
24 in. (60 cm) above, within 6 in. (15 cm)
below, within 6 in. (15 cm) on either side, or
within 6 in. (15 cm) in front of the exhaust.

* Meaning of “building opening”

Windows or doors which can be opened, but not
including those which are fixed or cannot be
opened.

Air intake Min. 6" (15 cm)

Air discharge

Min. 6"
(15 cm)

Min. 12"
(30 cm)

Valve side
Min. 10"
(25 cm)

Min.

7 ft.

(2 m)

Min.

7 ft.

(2 m)

Min. 6 in.
(15 cm)
Air intake

Ground

Obstacle

Obstacle above

Air discharge

Fig. 5a

27

● provide a solid base (level concrete pad, concrete

block, 4 in. × 16 in. (10 × 40 cm) beams or equal),
a minimum of 4 in. (10 cm) above ground level to
reduce humidity and protect unit against possible
water damage and decreased service life (Fig. 5b).

● use lug bolts or equal to bolt down unit, reducing

vibration and noise.

● use only the type of gas indicated on the name-

plate. This plate is located on the right side of the
outdoor unit, and should be checked before gas
line connection.

Min. 4" (10 cm)

Anchor bolts
(4 pcs.)

Exhaust
guard

Exhaust
port

Screws

Fig. 5b

7-2. Recommended Wire Length and Diameter

Regulations on wiring diameter differ from locality to locality. For field wiring requirements, please refer to your
local electrical codes. Carefully observe these regulations when carrying out the installation.

Refer to the wiring system diagram (Fig. 6).
Refer to your local codes or in the absence of local codes with the National Electric Code: ANSI/NFPA70.

NOTE

1
2
3
4

1
2
3
4

5

GG

G

6

INDOOR UNIT

TERMINAL (4P) TERMINAL (6P)

OUTDOOR UNIT

(INTER UNIT)

Power line

115V

Grounding line

Grounding line

Disconnect switch

(Field supply)

L1

Power supply:

Single-phase 60 Hz

115 VAC

L2

Fig. 6

CAUTION

● Be sure to connect the power supply line to the

outdoor unit as shown in the wiring diagram. The
indoor unit draws its power from the outdoor
unit.

WIRING SYSTEM DIAGRAM

WARNING

● Be sure to comply with local codes on running

wiring from the outdoor unit to the indoor unit
(size of wire and wiring method, etc.).

● Each wire must be firmly connected.

● No wire should be allowed to touch refrigerant

tubing, the compressor, or any moving part.

● To avoid the risk of electric shock, each air

conditioner unit must be grounded.

WARNING

28

7-3-1. Mounting on a Wall

a) Removable mounting

1) Momentarily hold the remote control unit at the desired
mounting position.

2) Confirm that the air conditioner responds correctly when you
press keys on the remote control from that position.

3) After confirming correct operation, use a screwdriver to screw
the supplied special mounting screw into the wall. (Fig. 7)

4) Hang the remote control unit from the special mounting
screw.

b) Non-removable mounting

1) Momentarily hold the remote control unit at the desired
mounting position.

2) Confirm that the air conditioner responds correctly when you
press keys on the remote control from that position.

3) After confirming correct operation, use a screwdriver to screw
the mounting screw into the wall. (Fig. 7)

4) Remove the remote control cover by sliding it downward.

5) Remove the batteries of the remote control unit.

6) Use a screwdriver to screw the remote control unit securing
screw into the wall through the hole in the battery compart­ment. (Fig. 8)

7) Replace the batteries.

8) Again confirm that the remote control unit operates correctly.

Wall

Screw
(Packed in indoor unit)

Fig. 8

Wall

Special
mounting
screw
(Packed in indoor unit)

Fig. 7

Removable mounting

Non-removable mounting

7-3. Remote Control Unit Installation Position

The remote control unit can be operated from either a non-fixed position or a wall-mounted position.
To ensure that the air conditioner operates correctly, do not install the remote control unit in the following places:

● In direct sunlight

● Behind a curtain or other place where it is covered

● More than 26 ft. (8 m) away from the air conditioner

● In the path of the air conditioner’s airstream

● Where it may become extremely hot or cold

● Where it may be subject to electrical or magnetic interference

29

8. FUNCTION

8-1. Motion Explanation

8-1-1. Heating

Heating operation begins with the refrigerant pump down cycle to move refrigerant into the heating circuit of the
system. Simultaneously, gas burner ignition is initiated for a period of about 1 minute.

When the refrigerant transport period is completed, refrigerant is contained within the heating circuit tubing and
retained there by the 2 check valves. The refrigerant pump down circuit condition is established by the reversing
valve set to the heating position and the ON/OFF valve, V1, is closed.

Upon completion of the pump down phase, the ON/OFF valve is opened for normal heating operation.
Cooling heat transfer tubing in the outdoor section is blocked from refrigerant flow by check valves during the

heating cycle.
Heating circuit refrigerant tubing is in contact with the exterior wall of the aluminum heat exchanger above the gas

burner. Heated refrigerant is circulated from the outdoor heat exchanger tubing to the indoor heat transfer tubing
by operation of the compressor. Controls maintain refrigerant temperature to a point above the saturation temper­ature and so the temperature is circulated as a gas.

Refrigerant flow is through the ON/OFF valve, V2, under stable conditions to provide for low power operation.
Low power operation is initiated (V2 opens) when thermistor-1 senses the temperature of equalization at 263 psig
(18.5 kg/cm2).

8-1-2. Cooling

Identical to operation for a typical ductless split air conditioner (heat pump).

● Indoor Unit

Room temperature sensor

Outdoor heat exchanger

Capillary tube Outdoor fan

outdoor fan motor

Thermal
fuse

Bimetal
thermostat

Proportional
control valve

Refrigerant
Heater

Solenoid
valve 2

Solenoid
valve 1

Manual
shut-off
valve

Gas inlet

Exhaust chimney

Check valve 1 Thermistor 2

V1 (ON/OFF valve)

V2 (ON/OFF valve)

Check
valve 2

Accumulator

Combustion

blower motor

Combustion

blower fan

Compressor

Reversing

valve

Fan
Indoor

heat
exchanger

Coil temperature sensor

Inter-unit cable

Wide tube

Thermistor 1

Narrow tube

HeatingCooling

● Outdoor Unit

30

8-1-3. Combustion Control

(1) Combustion

Combustion air is supplied into the burner for 20 seconds prior to ignition. The variable speed combustion air
blower motor speed is sensed and controlled. After this pre-purge is competed, spark ignition is provided at the
burner. Burner condition is monitored continuously during the burning period.

(2) Safety Controls

Following safety devices function to control the gas solenoid valve to shut off

● Flame Detection Circuit: Stops gas flow with flame sensor circuit

● Bimetal Thermostat: Stops gas flow with bimetal thermostat at 221°F (105°C)

● Thermal Fuse: Stops gas flow with thermal fuse at 302°F (150°C) — replaceable fuse

● Fuse-Control Circuit: Protected by internal 3A and 5A device

Exhaust

Refrigerant

heater

Supply

Gas inlet

Joint

Solenoid

valve 1

Solenoid

valve 2

Combination

gas valve

Flame sensor

probe

Ignition

electrical rod

Air

Combustion

blower fan

Ignition

circuit

Timer circuit

Pre-purge circuit

Combustion

blower motor

Flame sensor

circuit

Power
supply

31

8-2. Cooling

8-2-1. Room Temperature Control

● Room temperature control is obtained by cycling the compressor ON and OFF under control of the room

temperature sensor in the indoor unit.

● All information is transmitted every 3 minutes by the remote control unit to the controller in the indoor unit.

● The control circuit will not attempt to turn the compressor ON until the compressor has been OFF for at

least 3 minutes. To protect the compressor from stalling out when trying to start against the high side
refrigerant pressure, the control circuit has a built-in automatic time delay to allow the internal pressure to
equalize.

● As a protective measure, the control circuit switches the compressor OFF after 3 minutes or more of com-

pressor operation.

● Thermo. ON: When the room temperature is above T°F (T°F is set temperature).

Compressor ➔ ON

● Thermo. OFF: When the room temperature is equal to or below set temperature T – 1°F.

Compressor ➔ OFF

3 minutes 3 minutes 3 minutes

Set temp.

T°F

T – 1°F

Compressor

More than
3 minutes

Set speed

OFF OFF

OFF OFF

Outdoor fan

Indoor fan

Thermo.
OFF

Thermo.
ON

Thermo.
OFF

Thermo.
ON

32

8-2-2. Freeze Prevention (Cooling)

● This function prevents freezing of the indoor heat exchange coil.

● When the compressor has been running for 6 minutes or more and the temperature of the indoor heat

exchange coil falls below 36°F (2.4°C), the control circuit stops the compressor for at least 6 minutes. The
compressor does not start again until the temperature rises above 46°F (8°C) or 6 minutes have elapsed.

6 minutes

Set temp.

46°F

36°F

Compressor

Indoor heat exch.
coil temp.

Indoor fan

More than
3 minutes

More than
3 minutes

More than
10 minutes

Set speed

33

8-3. Heating

8-3-1. Room Temperature Control

● Room temperature control is obtained by cycling the compressor ON and OFF under control of the room

temperature sensor in the indoor unit.

● All information is transmitted every 3 minutes by the remote control unit to the controller in the indoor unit.

● The control circuit will not attempt to turn the compressor ON until the compressor has been OFF for at

least 3 minutes. To protect the compressor from stalling out when trying to start against the high side
refrigerant pressure, the control circuit has a built-in automatic time delay to allow the internal pressure to
equalize.

● As a protective measure, the control circuit switches the compressor OFF after 3 minutes or more of com-

pressor operation.

● Thermo. ON: When the room temperature is below T + 1°F (T°F is set temperature).

Compressor ➔ ON

● Thermo. OFF: When the room temperature is equal to or below set temperature T + 2°F.

Compressor ➔ OFF

3 minutes 3 minutes

Thermo.
OFF

Thermo.
ON

Thermo.
OFF

Thermo.
ON

OFF

OFF

OFF

OFF

OFF

OFF

OFF OFF

OFF

Set temp.

T+2°F
T+1°F

113°F

(45°C)

90°F

(32°C)

Compressor

Indoor fan

Combustion

Indoor heat exch.
coil temp.

Operation button

More than
3 minutes

More than
3 minutes

LL LL

Reversing
valve coil

30
sec.

30
sec.

Set speed

Set
speed

34

8-3-2. Refrigerant Control

(1) Thermistor 1

1) Initial check:
Must be able to confirm temperature increase of 2°F (1°C) within approximately 1 minute.
Objectives: 1. To detect error in switching reversing valve

2. To detect disconnection of Thermistor 1

2) Limit on amount of combustion at low temperature:
When starting up at low temperature, this function prevents rapid increase in temperature of refrigerant.

1. Minimum combustion at 50°F (10°C) or below

2. Limits combustion up to 70% of the maximum rated power at 95°F (35°C) or below

3) Bypass valve operation:
Opens the bypass valve at 117°F (47°C) and reduces power consumption.

4) Limit on amount of combustion at high load:

● Limits amount of combustion at 144°F (62°C)

Resets when temperature decreases to 140°F (60°C).

● Stops combustion at 149°F (65°C)

Resets when the temperature decreases to 131°F (55°C). (Compressor continuously operates.)
Error stop occurs after combustion stops eight times. (Operation lamp on indoor unit blinks.)

(2) Thermistor 2

1) Limit on amount of combustion:
Limits combustion when temperature exceeds 131°F (55°C). The range is proportionally controlled

between the minimum and maximum temperatures.

2) Combustion stop:
Stops combustion when temperature exceeds 185°F (85°C).
Error stop occurs after combustion is interrupted (stops) eight times. (Operation lamp on indoor unit

blinks.)

3) Detection of bypass valve operation
Must be able confirm temperature increases 5°F (3°C) within approximately 1 minute.

35

8-3-3. Combustion Saving Function

After Thermo. OFF occurs, shifts to Continuous Combustion Mode, Save Mode 1, or Save Mode 2, according to
the load inside the room.

<Normal Combustion Mode>

Performs combustion which is proportionally controlled by setting the maximum amount of gas equivalent
to the amount of rated combustion.

<Save Mode 1>

Performs combustion which is proportionally controlled by setting the maximum amount of gas to about
70% of the rated amount of combustion.

<Save Mode 2>

Performs continuous combustion by setting the amount of gas equivalent to the minimum amount of com­bustion.

(1) Save Function

If Thermo. ON lasts less than 10 minutes under Normal Combustion Mode subsequent to Thermo. OFF, Save
Mode 1 is automatically selected for the following Thermo. ON, and then Save Mode 2 is selected if Save Mode 1
lasts less than 10 minutes.

(2) Reset Function

When combustion in Save Mode 1 continues past 10 minutes, it goes back to Normal Combustion Mode (Save
Mode 2 to Save Mode 1). However, if Thermo. OFF occurs again within 10 minutes under Normal Combustion
Mode, Save Mode 1 is selected at the next Thermo. ON (Save Mode 1 to Save Mode 2).

Normal Combustion

Mode

Save Mode 1

Thermo.

OFF

Less than

10 minutes

Less than

10 minutes

Less than

10 minutes

Thermo.

OFF

Thermo.

OFF

Thermo.

OFF

Save Mode 2

Stop combustion

Normal Combustion

Mode

Save Mode 1

Save Mode 2

Thermo.

OFF

Thermo.

OFF

10 minutes 10 minutes 10 minutesLess than

10 minutes

36

8-3-4. Cold Draft Prevention Function (During Heating Operation)

This function prevents a cold draft from being released at the beginning of Heating Operation or during operation
of the room temperature thermo.

Change in Fan Speed

● When Heating Operation is started with the temperature of the heat exchanger less than 90°F (32°C):

● Until the temperature of the heat exchanger goes over 117°F (47°C), fan speed varies according to the

temperature of the heat exchanger.

● Once the temperature of the heat exchanger rises over 117°F (47°C), cold draft prevention function is

released.

Temperature of

coil temperature sensor

Fan speed

Set speed

LL

117°F (47°C)

90°F (32°C)

Temperature of

Less than 90°F (32°C) 90 – 117°F (32 – 47°C) Over 117°F (47°C)

heat exchanger

Fan speed LL LL – Set speed Set speed

37

8-4. Fan Speed Control

During Cooling Operation Automatic fan speed

TS + 4°F (2°C)

3 minutes

OFF

T

S

+ 2°F (1°C)

Set Value (T

S

)

H

M

L

ON

OFF

Fan Speed

Compressor

3 minutes

ON

TR:
Room temp.

TS – 2°F (1°C)

Ts

T

S

+ 2°F (1°C)

30 seconds 30 seconds

H

M

LL

Compressor ON

Compressor OFF

Fan Speed

TR:
Room temp.

* For 3 minutes after power ON, the compressor does not turn on.

* For 30 seconds after the compressor is turned OFF, the previous fan speed is maintained.

During Heating Operation Automatic fan speed

38

8-5. Dry Operation (Dehumidification)

● Dry operation uses the ability of the cooling cycle to remove moisture from the air, but by running at low

level to dehumidify without greatly reducing the room temperature. The air conditioner repeats the cycle of
turning ON and OFF automatically as shown in the chart below according to the room temperature.

● Intermittent ventilation occurs by switching the indoor fan speed between L ↔ LL.

● Dry operation does not occur when the room temperature is under 59°F (15°C), which is the Monitor

Zone.

● When the compressor stops, the indoor fan stops as well.

NOTE

Room temp.

T + 4°F (2°C)

T – 2°F (1°C)

Room temp.

59°F (15°C)

Set temp. T°C

Cooling operation

* Dry A Zone

Compressor: Continuous operation
FMI (indoor fan): L (low speed)/LL (very low speed) intermittent ventilation only while the compressor is ON.

* Dry B Zone

Compressor: Intermittent operation (ON for 3 minutes and OFF for 9 minutes)
FMI (indoor fan): L (low speed)/LL (very low speed) intermittent ventilation only while the compressor is ON.

Monitor Zone

Both the indoor and outdoor units stop.

39

8-6. Automatic Operation

(1) Normal

● Set temperature can be shifted ± 4°F (2°C), in 2°F (1°C) steps.

● If operation commences again within 2 hours of the previous operation, the previous setting is applied.

(2) Changing fan speed “Automatic”

Fan speed is automatically selected by the temperature difference between the room temperature (TR) and set
temperature (TS).

During Heating Operation

During Cooling Operation

Room temperature at start of operation Temperature set automatically Operation mode

TR°F (°C) °F (°C)

88 (30) ≤ T

R

82 (27)
84 (24) ≤ TR < 88 (30) 80 (26) Cooling
80 (26) ≤ TR < 84 (28) 78 (25)
72 (22) ≤ TR < 80 (26) 76 (24) Dry

TR < 72 (22) 76 (24) Heating

Room temperature (TR) and set temperature (TS) Fan speed

TR≥ TS+ 4°F (2°C) H / High

TS+ 4°F (2°C) > TR≥ TS+ 2°F (1°C) M / Medium

TS+ 2°F (1°C) ≥ TR≥ T

S

L / Low

TS> TR(Thermo. OFF) L / Low

Room temperature (TR) and set temperature (TS) Fan speed

TR≤ T

S

H / High

TS< TR< TS+ 2°F (1°C) M / Medium

TS+ 2°F (1°C) ≤ TR(Thermo. OFF) LL / Very Low

40

8-7. Freeze Prevention

When the evaporation temperature drops to less than the temperatures stated below during Cooling or Dry
Operation, the operation of the outdoor unit is automatically stopped to prevent the heat exchanger from
freezing up.

(1) Cooling / Dry Cooling Zone: Dry A Zone

< Conditions of freeze prevention operation >
a. Temperature of heat exchanger is less than 36°F (2.4°C)
b. During Cooling or Dry Operation When the conditions of a, b, and c are met
c. More than 6 minutes pass after start of operation

< Conditions of Reset >
When temperature of heat exchanger rises to 46°F (8°C) or more.

(2) Dry B Zone

< Conditions of freeze prevention operation >
a. Temperature of heat exchanger is less than 36°F (2.4°C)
b. During Dry Operation

When both conditions a and b are met

< Conditions of Reset >
When temperature of heat exchanger rises to 46°F (8°C) or more.

* During freeze prevention operation, the indoor fan stops (Dry B Zone only).

41

8-8. Overload Prevention (Heating)

8-8-1. Indoor Unit

● This function prevents overheating of the indoor heat exchange coil.

● When the temperature of the indoor heat exchange coil rises above 131°F (55°C), and if the indoor fan is

L (low speed), then the fan speed changes from L (low speed) to M (medium speed).

8-8-2. Outdoor Unit

● Unless the temperature of Thermistor 1 drops to 144°F (62 °C) or less from the point A within 1 minute,

The burner is set to M (point C.)

● Reset is activated when the temperature of Thermistor 1 drops to 122°F (50°C) or less, with the burner

being set to H.

● High-load protection for the outdoor unit is operated independently from the high-load protection for the

indoor unit.

Compressor

Indoor fan

Indoor heat
exch.coil
temp.

H→H, M→M, L→M

131°F

(55°C)

113°F

(45°C)

H or M or L

ON

Thermistor 1

149°F

(65°C)

144°F

(62°C)

122°F

(50°C)

Combustion

Compressor

H

M

L

C

A

B

H

1 minute

Stop

9. OPERATION FLOWCHARTS

9-1. Cooling, Dry

9-1-1. Star ting Flowchart

Cool • Dry

Operation starts

Room temp. higher

than preset temp.

Coil thermistor

(higher than 46°F)

Operation lamp light ON

Dry

Cooling

Indoor fan: Start speed ON

NO

YES

NO

NO

NO

YES

YES

YES

YES

Troubleshoot

Operation starts

Overload relay works

1

2

Flap motor ON

Outdoor fan motor OFF
Compressor OFF

Compressor OFF
Outdoor fan motor OFF

Outdoor fan motor OFF

Flap motor OFF
Indoor fan OFF
Indoor power relay OFF

Outdoor power relay ON
Outdoor fan motor ON
Compressor ON

All lamps Light OFF

Compressor OFF

Coil thermistor

(higher than 36°F)

3 min. timer

count-up

YES

Cooling

Safety device works

18

Dry

19

Room temp. ≥ Preset

+2

Indoor fan
Outdoor fan motor ON
Compressor

NO

YES

Room temp. ≥ Preset

+2

Outdoor fan motor

ON

Compressor

YES

Room temp. ≥ 15°C

Monitor
Indoor fan
Outdoor fan motor OFF
Compressor

Outdoor fan motor
Compressor

3 min. ON
9 min. OFF
Intermittent

Indoor fan

Low &
very low

Indoor fan

Low &
very low

Dry A Dry B

9-1-2. Stopping Flowchart

Operation starts

Operation lamp Light OFF
Compressor OFF
Indoor fan OFF
Outdoor fan OFF

9-1-3. Check Refrigerant Cycle Flowchart

YES

Intake-outlet

temp. lower than

14 to 18°F

Current

(8.5A)

Obstructed heat exchanger

Over-charge of

refrigerant

Cooling operation

Refrigerant shortage

Troubleshoot

Capillary tube blockage

Cooling

NO

YES

YES

Pressure at
service port

(86 to 128psi)

NO

NO

Normal

Compressor failure

9-1-4. Time Flowchart

ON timer

Cool

Stop dry

Heat

Cool

Dry

Heat

NO

YES

Timer passes

Remote control unit

OFF timer set

Timer lamp Light ON

Timer lamp Light OFF
Operation lamp Light OFF

OFF timer

Cool

Dry

Heat

NO

YES

Timer passes

Remote control unit

OFF timer set

Timer lamp Light ON

Timer lamp Light OFF

42

Combustion lamp flashes

Wire misconnection

Amp. current is high

Amp. current is low

Initial

check 1 normal

Power Supply

Troubleshoot

Operation starts

Operation stops

1

2

3

4

3

6

8

7

7

Flap motor

E

2

P ROM read fail

Coil temp thermistor fail

Operation lamp flashes

Room temp thermostat fail

Combustion lamp flashes

Indoor fan

ON

NO

YES

NO

NO

NO

NO

YES

YES

YES

YES

ON LL

Operation lamp light

Reversing valve

ON

ON

Compressor ON

Initial

check 2 normal

Gas

combination valve &

circuit normal

Room temp.

(lower than set temp.)

9

9

a

Combustion motor (0 or 40 sec. after)

(80 sec. after)

(3 sec. after)

(more than 19A 2 sec. after)

(more than 17A 8 sec. after)

ON

10

11

12

Proportional control valve

ON

13

Solenoid valve GV1 ON14Solenoid valve GV2 ON

Solenoid valve GV1

OFF

Solenoid valve GV2

OFF

15

Ignitor ON

Combustion lamp ON

Indoor fan OFF

Compressor OFF

Solenoid valve GV1

OFF

Solenoid valve GV2

OFF

Proportional control valve OFF

Combustion lamp OFF

Ignitor OFF

Ignitor OFF

16

2

ON/OFF valve ON

ON/OFF valve 2 ON

Fan speed: Set speed

17

11

8

17

b

c

8

Fan speed: Set speed

Proportional controlled

combustion

3 min. timer

count-up

NO

YES

Initial check 3

normal

NO

YES

Thermistor 1, 2

normal

Operation lamp light

OFF

Indoor fan OFF

Flap motor

Compressor

Reversing valve

Operation lamp

OFF

Lamp flashes

OFF

OFF

ON/OFF valve V2

ON/OFF valve V1

(3 sec. after from )

OFF

Combustion motor

OFF

valve PV

Proportional control

OFF

Solenoid valve GV1

OFF

Solenoid valve GV1

(60 sec. after)

OFF

Solenoid valve GV2

OFF

valve PV

Proportional control

OFF

OFF

LD 2345

LD 2345

LD 2345

NO

NO

LD 2345

NO

NO

YES

YES

YES

Combustion motor

rev. normal

Flame sensor

circuit normal

11

NO

YES

Detect flame

(higher than 1µA)

NO

YES

Indoor coil temp.

(lower than 32°C)

NO

YES

(30 sec. after)

Thermistor-1

(higher than 47°C)

NO

YES

Safety device works

NO

YES

Room temp.

(higher than set temp.)

NO

YES

Thermistor-1

(higher than 42°C)

Flame sensor failure

: light off

NO

YES

First

Thermal fuse bimetal

thermostat normal

NO

YES

First

Combustion lamp flashes

LD 2345

LD 2345

LD 2345

C

(12 sec. after)

(15 sec. after)

(3 sec. after

from )

a

NO

YES

Combustion

continues more than

4 min.

LD 2345

LD 2345

LD 2345

LD 2345

Thermistor-1

higher than (185°F 85°C)

Thermistor-2

higher than (149°F 65°C)

Combustion lamp OFF

Combustion motor

(60 sec. after)

OFF Combustion motor

(60 sec. after)

OFF

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

c

ON/OFF valve failure

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

5

LD 2345

Combustion motor

(60 sec. after)

OFF

c

Reversing valve failure

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

4

Combustion motor

(60 sec. after)

OFF

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

NO

YES

Less than 3 times

NO

YES

Thermistor-1

(lower than 122°F 50°C)

NO

YES

NO

YES

Thermistor-2

(lower than 131°F 55°C)

10 min. passes

from

b

17

LD 2345

Combustion motor

(60 sec. after)

OFF

c

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

Combustion lamp OFF

Thermistor-1

higher than (149°F 68°C)

Thermal fuse

bimetal thermostat failure

ON/OFF valve V2

ON/OFF valve V1

(3 sec. after from )

OFF

OFF

C

ON/OFF valve V2

ON/OFF valve V1

(3 sec. after from )

OFF

OFF

Compressor

Reversing valve

OFF

OFF

C

Combustion motor

(60 sec. after)

OFF

Solenoid valve GV2

OFF

Solenoid valve GV1

OFF

Proportional control

valve PV

OFF

Combustion lamp OFF

: light on

9-2. Heating

9-2-1. Star ting Flowchart

43

9-2-2. Stopping Flowchart

Operation starts

Operation lamp Light OFF

Operation lamp Light OFF

Compressor OFF

Indoor fan OFF

Solenoid valve GV1 OFF

Solenoid valve GV2 OFF

Proportional control valve OFF

On/Off valve V1 OFF

On/Off valve V2 OFF

Reversing valve OFF

Combustion motor OFF

(180 sec.

after)

(60 sec.

after)

44

10. PROCEDURE FOR DISMANTLING THE UNIT

10-1. Procedure for Dismantling the Indoor Unit

(1) How to remove grille

(2) How to remove PCBs

➀ Close the flap (upper airflow adjustment plate)

and open the screw covers. Then remove the
screws (2).

➂ Detach the attachment tabs (2) at the top of the

grille by lifting the grille.

➁ Remove the fixing tabs (3) at the bottom of

decorative grille.

Detach all the wire connectors on PCB A and B in the electrical component box, and remove the tabs
holding the PCBs. Detach the PCBs A and B from the top.

45

(3) How to remove electrical component box

➀ Remove the screw for ground screw (green, 1).

(4) How to remove drain pan

Remove the screw (1) attaching the drain pan and remove it upward by pressing the tabs (one each for
right and left) hooked to the frame.

➂ Remove the screws (3) attaching the electrical

component box, and remove the box from the
frame by pressing the tabs at the back of the
box.

➁ Remove the connectors for sensor, fan motor

and flap motor, which are connected to the
electrical component box.

46

(5) How to detach heat exchanger

➀ Remove the screws (2) attaching the metal clip

of the tube. Extend the supplementary tubing at
the back of the unit.

➁ Remove the screws (3) attaching the heat

exchanger. Remove the tabs holding the resin
boss at the top right of the heat exchanger, and
then pull the heat exchanger off from the
frame.

(6) How to detach fan and fan motor

➀ Loosen the hexagonal screw in the fan boss

which attaches the fan.

➁ Remove the screw (1) for the fan bearing

cover.

➂ Pull out the fan boss from the fan motor shaft,

and then pull out the fan to the left.

➃ Remove the fan motor by picking it up.

47

10-2. Procedure for Dismantling the Outdoor Unit

(1) How to remove the external panels

(2) How to detach the rear panel

➀ Remove the screws (2) of the top panel and

the screws (5) of the front panel.

➁ Remove the screw (1) of the side cover, the

screws (3) of the terminal block cover, and the
screws (2) of the terminal block.

➀ Remove the front panel and unscrew the

screws (9) attaching the rear panel, and detach
the manual shut-off valve.

(3) How to detach the combustion blower

➀ Remove the screws (2) attaching the blower. ➁ Detach CN5 and CN14 on outdoor unit PCB.

48

(4) How to detach combination valve and gas conduit

➀ Remove the screw (1) for the attachment plate of the combination valve in back of the main unit.
➁ Detach the 2 connectors (CN11 for proportional valve and CN08 for solenoid valve).
➂ Remove the screws (2) attaching the gas conduit in front of the combustion chamber, and take off the

combination valve with gas conduit.

(5) How to detach combination valve

➀ Remove the attachment screws, and dismantle as shown below.

➂

49

(6) How to detach ignition probe and flame sensor electrode

➀ Detach the connector of the ignition probe.
➁ Remove connector CN17 from outdoor unit PCB.
➂ Remove the screw (1) for the attaching metal clip and remove the ignition probe and flame sensor elec-

trode. (Flame sensor electrode is replaced together with the wires connected.)

(7) How to detach burner unit

➀ Remove the attachment screws (6) and pull the burner unit to the front. (When reattaching the burner unit,

replace the center screw first.)

(8) How to detach gas nozzle

➀ Remove burner unit.
➁ Remove the screws (2) attaching the nozzle.

(Rear view)

50

11. POINTS TO DIAGNOSE

11-1. Indoor Unit Alarm Signal

11-2. Manifold Pressure

● To set manifold pressure there are 2 settings – low pressure and high pressure.

● Use SW1 to move to the 2 modes used to adjust the two pressures.

Press SW1 1 time for low pressure.
Press SW1 2 times for high pressure.
Press SW1 3 times for normal operation.

● Use VR1 to set the low, lighting pressure and VR2 to set the high pressure.

● Step 1: Set low pressure

1. Press SW1 and hold until LEDs 4 and 5 flash.

2. Adjust the low pressure with VR1 to 0.63 inches of water column.

● Step 2: Set high pressure

1. Press SW1 again and LEDs 1 and 2 will flash.

2. Adjust pressure with VR2 to 3.43 inches of water column.

● Step 3: Set lighting pressure

Lighting pressure will be set automatically from Step 1 and Step 2.

Check these settings 2 or 3 times to insure all are correct then reset until no LEDs flash.

NOTE

Alarm Signal Error Meaning Operation Information

Misconnection of inter-unit wiring Heating • Cooling • Dry Connect correctly
Room temp. thermistor is defective Heating • Cooling • Dry Normal: 9 – 11 kΩ at 50°F

4 – 6 kΩ at 77°F
Power Lamp Heat exch. thermistor is defective Heating • Cooling • Dry Normal: 100 – 120 kΩ at 50°F
Flashing 50 – 60 kΩ at 77°F

Fan motor is defective Heating • Cooling • Dry Alarm signal appears in 1 min.
Amp. current is high Heating • Cooling • Dry More than 17 amp.
Amp. current is low Heating • Cooling • Dry Less than 0.8 amp.
Heat exch. thermistor detects high temp Heating More than 154°F (68°C)

Outdoor Unit Fuel Inlet Pressure W.C. (kPa) Manifold Pressure W.C. (kPa)

Low High Lighting (10 sec.)

LD4, 5 Flashing LD2, 3 Flashing (verification)

CG1411 Natural gas 7.0 (1.74) 0.63 (0.157) 3.43 (0.853) 2.32 (0.579)

51

11-3. Checking Electrical Components

11-3-1. Components

Flow Measurement Target (Normal) Upper: Volt, Amp.

Remarks

No. CO. No. Wire Color (Normal) Lower: Resistance
1 T WHT – BLU

DC 1 – 12 (Pulse)

Flap motor

300 – 450 Ω

BLU – BRN

AC 100 – 130 V

2 S

30 – 60 Ω

Indoor fan motor

RED – BLU

DC 1 – 12V
More than 3000 Pulse/min.

50°F (10°C) 9.0 – 11.0 kΩ

Indoor

3 Z 1WHT – GRY2 68°F (20°C) 5.5 – 7.0 kΩ

86°F (30°C) 3.5 – 4.5 kΩ

room temperature sensor

4 U 3BLK – BLK4

50°F (10°C) 100 – 120 kΩ Indoor
68°F (20°C) 50 – 60 kΩ coil temperature sensor

5 B BLK – BLK

AC 100 – 130 V

Reversing valve

300 – 400 Ω

BLK – WHT

6 R WHT – PNK 1 – 5 Ω Compressor

BLK – PNK

7 Terminal block WHT 3 – 5 A Ampere current

68°F (20°C) 9.8 – 10.8 KΩ

Outdoor

8 KM BLK – BLK 86°F (30°C) 6.8 – 7.3 KΩ

140°F (60°C) 2.4 – 2.6 KΩ

thermistor 1, 2

D PUR – PUR

AC 30 – 115 V

Combustion blower motor

9

10 – 30 Ω

N RED – BLU

DC 1 – 5 V Combustion blower motor
More than 1000 Pulse/min. fan speed sensor

! O BLU – BLU

DC 5 – 24 V Proportional

40 – 160 Ω control valve

" J BLK – Ground

AC 100 – 130 V

Flame sensor probe

More than DC 1 µA

# P YEL – YEL

Not more than DC 1 V Thermal fuse
Not more than 1 Ω bimetal thermostat

$ I WHT – WHT

DC 90 – 120 V

Gas valve 1

1 – 2.5 kΩ

% I ORG – ORG

DC 90 – 120 V

Gas valve 2

1 – 2.5 kΩ

& G RED – RED AC 100 – 130 V Ignition transformer
( E BLK – BLK

AC 100 – 130 V

ON/OFF valve 1

300 – 500 Ω

) F BLK – BLK

AC 100 – 130 V

ON/OFF valve 2

300 – 500 Ω

C WHT – BLU AC 100 – 130 V

~

V

WHT – BRN 70 – 150 Ω Outdoor fan motor
WHT – PNK 300 – 500 Ω

+ W PNK – PNK

Not more than AC 1 V

Overload relay

Not more than 1 Ω

Operation

Outdoor Unit Voltage at Terminal Block

1 – 21– 31– 4

Cooling • Dry 100 – 130 V 100 – 130 V 0 V

Heating 100 – 130 V 100 – 130 V 100 – 130 V

OFF 0 V 100 – 130 V 0 V

52

11-3-2. Indoor Unit

Indoor Unit

Transformer Voltage • Coil Resistance

Measurement Target (Normal) Upper: Voltage

CN Wire Color (Normal) Lower: Resistance

Y

1 WHT – WHT

AC 100 – 130 V

45 – 100 Ω

Y

2 BRN – BRN

AC 12 – 18 V

0.5 – 4 Ω

11-3-3. Outdoor Unit

Outdoor Unit

Transformer Voltage • Coil Resistance

Measurement Target (Normal) Upper: Voltage

CN Wire Color (Normal) Lower: Resistance

H ORG – ORG

AC 100 – 130 V

50 – 100 Ω

Q

2 YEL – YEL

AC 100 – 130 V

0.5 – 4 Ω

Q

1 RED – RED

AC 20 – 30 V

1 – 10 Ω

Q

1 BLU – BLU

AC 10 – 15 V

5 – 15 Ω

53

12. TROUBLESHOOTING

12-1. Check Before and After Troubleshooting

12-1-1. Check Power Supply Wiring

● Check that power supply wires are correctly connected to Terminals L and N on the terminal plate in the

outdoor unit.

12-1-2. Check Inter-Unit Wiring

● Check that inter-unit wiring is correctly connected to the outdoor unit from the indoor unit.

12-1-3. Check Power Supply

● Check that voltage is in specified range (±10% of the rating).

● Check that power is being supplied.

12-1-4. Check Lead Wires and Connectors in Indoor and Outdoor Units

● Check that coating of wires is not damaged.

● Check that lead wires and connectors are firmly connected.

● Check that wiring is correct.

INDOOR UNIT

Terminal (4P) Terminal (6P)

(Inter-unit)
Power line
115V

OUTDOOR UNIT

1
2
3
4

GG

1
2
3
4

G

5

L1
Power supply
Single-phase 60 Hz
115 VAC

L2

Grounding line

6

Grounding line

Disconnect switch
(Field supply)

54

12-2. When the Air Conditioner Does Not Work at All (Both Indoor and

Outdoor Units) — Operation Lamp Does Not Light

12-2-1. Malfunction in Power Supply

➀ Check if operation selector of the indoor unit is set to ON. If it is not, set the switch to ON.
➁ Check if the circuit breaker is disengaged or if electricity is not being supplied properly.

Normal AC 104 – 126 V

In case of abnormality ➞ Check power source

No abnormalities, proceed to 12-2-2.

* Use a circuit tester (set to AC range).

12-2-2. Abnormalities in Power Transformer

➀Check voltage on the secondary core side.

Measure voltage 2P connector of TRANS 2 (without disconnecting connectors).

Caution: Care should be taken that the tips of the tester rods do not touch each other since the circuit is

electrically charged.

In case of abnormality ➞ Replace the power transformer.

Normal TRANS 2 BRN – BRN AC 12 – 18 V

*Use a circuit tester (set to AC range).

12-3. Operation Lamp Blinks (It Keeps Blinking after 3 Minutes Following

Start of Operation)

If the operation lamp continues to blink more than 3 minutes, check for the following possible causes in this order:

(1) Incorrect Wiring of Inter-unit Wiring (connector No. 1 – 4)
(2) Thermistor Abnormality (Indoor Unit Only)
(3) Protective Circuit of Outdoor (Burner) Unit Operated (during heating operation only)
(4) CT Detection
(5) Indoor Fan is Defective
(6) Power Circuit Wiring Error
(7) Outdoor Unit Power Supply Failure
(8) Outdoor Unit Power Transformer Defective
(9) Outdoor Unit Compressor Motor Overload Relay Has Operated
(10)Outdoor Unit Compressor Motor Defective

12-3-1. Incorrect Wiring of Inter-unit Wiring

If the blinking of the operation lamp occurs upon initial operation following installation work, incorrect wiring of
inter-unit cable between indoor and outdoor units is likely. Correctly rewire the inter-unit cable.

Caution: Be sure to turn off the circuit breaker switch before carrying out the wiring work.

55

No. Caused by (outdoor unit)

LED lamps

Meaning

2 3 4 5

— Normal ●● ●● ●● ●● Normal operation
— Defective in IC chip (E2PROM) ●● ●● ●● ● Cannot read IC chip data or missing IC chip on outside

PCB

— Defective Gas Valves ●● ●● ● ●● Detects abnormality in Gas Valve Circuit at initial

checking

A Detective Thermistor 1 ●● ●● ●● Open or Short of Thermistor 1
B Detective Thermistor 2 ●● ● ●● ●● Open or Short of Thermistor 2
C Limit switch ●● ● ●● ● Thermal fuse or Bimetal Thermostat tripped
D Flame current circuit ●● ● ● ●● Defective abnormal in Flame Current Circuit
E Lighting failure ●● ● ● ● Couldn’t establish flame
F Lost flame ● ●● ●● ●● Flame Sensor Circuit detects lost flame and could not

establish the flame

G Incorrect combustion motor speed ● ●● ●● ● Incorrect combustion motor speed
H Over-time period in retry ● ●● ● ●● Thermistor 1 or Thermistor 2 temperature did not go

down in set period

I Over number of times in retry ● ●● ●● Combustion stopped by Thermistor 1 or Thermistor 2

more than set number

J Bypass Valve (V2) not open ● ● ●● ●● Bypass Valve failure or drop-out of Thermistor 2

— Reversing Valve not working ● ● ●● ● Reversing Valve failure, drop-out of Thermistor 2, or

shortage of refrigerant

12-3-2. Thermistor Abnormality (Indoor Unit Only)

Check open / short circuit at the coil thermistor and room thermistor (between 1 and 2 of the lamp 8P) on the
PCB of the indoor unit (but only when the room temperature is 14 to 113°F).

12-3-3. Protective Circuit of Outdoor (Burner) Unit Operated

Check the following according to the failure display. Check items listed in 12-6. Heating Operation Not Possible.

12-3-4. CT Detection (Refer to 12-3-9 and 12-3-10.)

(1) Compressor abnormality
(2) Compressor over-load relay engaged

Note: Refer to 12-8. Failure Display on Outdoor Unit and Correction Method.

●● light off

● light on

56

12-3-5. Indoor Fan is Defective

➀Check if the indoor fan is locked up.

Turn fan gently by hand.

➁Check if motor circuit is defective.

Set temperature by remote controller so that air conditioner operates under Thermo. OFF in either cooling or
heating operation, then start operation.
Check if it operates without the operation lamp blinking for more than 3 minutes.

When fan does not turn easily ➞ Replace fan motor
No abnormalities, proceed to check ➁.

In case of abnormality (operation lump starts blinking after about 1 minute) ➞ Proceed to check ➂.

No abnormalities, proceed to check ➂.

➂Check indoor unit PCB.

Measure voltage between 1 – 2 of 3P connector (Hole IC) on indoor unit PCB.

Caution: Care should be taken that the tips of the tester rods do not touch each other since the circuit is

electrically charged.

➃Disconnect FAN 5P connector on indoor unit PCB and measure resistance between cables.

In case of abnormality ➞ Replace indoor unit PCB.

No abnormalities, proceed to check ➃.

In case of abnormality ➞ Replace the indoor fan motor.

No abnormalities, replace indoor unit PCB.

Normal

Connector No. Voltage
Between 1 – 2 DC 3 – 7 V

Color Resistance

Normal BLU – BRN 94 – 116 Ω

BLU – PNK 115 – 141 Ω

*Use a circuit tester (set to DC range).

12-3-6. Power Circuit Wiring Error

Check wiring of power circuit.

Set temperature by remote controller so air conditioner operates under Thermo. ON in cooling operation, then
start operation.
Check if compressor motor operates for more than 10 seconds.

It does not operate at all ➞ Proceed to check 12-3-7 and 12-3-8.
Stops operation in about 3 seconds ➞ Proceed to check 12-3-9.

No abnormalities, proceed to check 12-4.

57

12-3-7. Outdoor Unit Power Supply Failure

Measure voltage between Terminals 5 – 6 on terminal block of outdoor unit.

Set temperature by remote controller so conditioner operates under Thermo. ON in either cooling or heating
operation, then start operation. Then measure voltage between Terminals 1 – 2 on terminal block of outdoor
unit.

Caution: It is not possible to measure while 3-minute restart timer is in operation.

In case of abnormality ➞ Check connection of inter-unit cable.
No abnormalities, replace indoor unit PCB.

No abnormalities, proceed to check 12-3-8.

* Use a circuit tester (set to AC range).

Normal AC 104 – 126 V

12-3-8. Outdoor Unit Power Transformer Defective

➀Check voltage of power transformer.

Measure voltage of 4P connector (CN10A), 3P connector (CN10B) and 2P connector (CN09) of indoor unit
PCB (without disconnecting connectors).

Caution: Care should be taken that the tips of the tester rods do not touch each other since the circuit is

electrically charged.

In case of abnormality ➞ Replace power transformer.
No abnormalities, replace outdoor unit PCB.

4P, CN10A

RED – RED 20 – 30 V

Normal

BLU – BLU 10 – 15 V

3P, CN10B YEL – YEL 85 – 115 V

CN09 ORG – ORG 104 – 126 V

*Use a circuit tester (set to AC range).

In case of abnormality ➞ Check it again after more than 30 minutes (wait for it to cool down). If the result is

the same, replace the temperature overload relay.

No abnormalities, check wiring to overload relay.

12-3-9. Outdoor Unit Compressor Motor Overload Relay Has Operated

Caution: Carry out this check only after cutting power at the mains or disconnecting unit from the power

supply.

➀Check temperature overload relay for continuity.

Normal 1 Ω or less

* Use a circuit tester (set to Ω range).

58

12-3-10. Outdoor Unit Compressor Motor Defective

➀Check if compressor motor is locked up.

Set temperature by remote controller so air conditioner operates under Thermo. ON in cooling operation, then
start operation.
Check if compressor operates.

➁Measure resistance of compressor motor.

Disconnect each wire from the top of the compressor and measure resistance of each phase.

No abnormalities, proceed to check ➁.

In case of abnormality ➞ Stops in 2 to 5 seconds. Humming of compressor motor can be heard.

After auto restart by 3-minute timer, same thing happens. If this condition contin­ues, replace the compressor motor.

Caution: Carry out this check only after cutting power at the mains or disconnecting unit from the power

supply.

In case of abnormality ➞ Replace compressor.

Phase Resistance

Normal

R – S 1 – 5 Ω
S – C 1 – 5 Ω
C – R 1 – 5 Ω

* Use a circuit tester (set to Ω range).

12-4. Outdoor Unit Fan Does Not Work

12-4-1. Outdoor Unit Fan Motor Defective

➀Check if outdoor unit fan is locked up.

Turn fan gently by hand.

When fan does not turn easily ➞ Replace fan motor.

No abnormalities, proceed to check ➁.

*Use a circuit tester (set to Ω range).

➁Measure resistance between each wire.

In case of abnormality ➞ Replace fan motor.

No abnormalities, check continuity of each wire (PNK, BRN and BLU).

Color Resistance

Normal BLU – BRN 70 – 150 Ω

BLU – PNK 300 – 500 Ω

59

12-5. Flap Motor Does Not Work

12-5-1. Louver Motor Defective

➀Set to cooling operation with flap to oscillate (movie) using remote controller and measure voltage applied to

the louver motor at FLAP terminal of 5P connector.

In case of abnormality ➞ Replace indoor unit PCB.

No abnormalities, proceed to check ➁.

*Use a circuit tester (set to DC range).

Normal

Color Output Voltage

WHT and each BLU wire DC 1 – 12 V (pulse)

*Use a circuit tester (set to Ω range).

Normal

Color Resistance

WHT and each BLU wire 300 – 450 Ω

➁Disconnect FLAP of 5P connector for louver motor and measure resistance.

In case of abnormality ➞ Replace louver motor.

No abnormalities, check if there is physical or mechanical interference to louver movement.

12-6. Heating Operation Not Possible

12-6-1. Thermistor 1 Defective

Failure Display on Outdoor Unit PCB: ●● ●● ●●

Check Thermistor 1 (CN15).

➀Disconnect Thermistor 1 connector (3P, BLK) from outdoor unit PCB, and measure resistance on Thermistor 1

side.

In case of abnormality ➞ Replace Thermistor 1.

Temperature Resistance

Normal

68°F (20°C) 6.0 – 7.1 kΩ
86°F (30°C) 4.0 – 5.0 kΩ

140°F (60°C) 1.5 – 1.7 kΩ

Temperature Resistance

Normal

68°F (20°C) 6.0 – 7.1 kΩ
86°F (30°C) 4.0 – 5.0 kΩ

140°F (60°C) 1.5 – 1.7 kΩ

12-6-2. Thermistor 2 Defective

Failure Display on Outdoor Unit PCB: ●● ● ●● ●●

Check Thermistor 2 (CN16).

➀Remove Thermistor 2 connector (3P, RED) from the outdoor unit PCB, and measure resistance on the

Thermistor 2 side.

In case of abnormality ➞ Replace Thermistor 2.

60

12-6-3. Safety Device Operated

Failure Display on Outdoor Unit PCB: ●● ● ●● ●

Check safety device.

➀Disconnect safety device connector (CN12, 2P, WHT) from outdoor unit PCB, and measure resistance on the

safety device.

In case of abnormality ➞ Replace temperature fuse or temperature limiting switch.

Normal 1 Ω or less

*Use a circuit tester (set to Ω range).

In case of abnormality ➞ Replace outdoor unit PCB.

In case of abnormality ➞ Replace outdoor PCB.

➁Remove flame rod connector, and measure direct current between connector and PCB.

Caution: The flame rod retains electromotive force immediately after combustion ceases, therefore measure-

ment should be made while the equipment is cool.

12-6-4. Erroneous Flame Detection

Failure Display on Outdoor Unit PCB: ●● ● ● ●●

Check flame sensor probe.

➀Measure voltage of alternative current between flame rod connector (1P, CN17) and ground.

Normal AC 104 – 126 V

Normal DC 1µA or less

*Use a circuit tester (set to AC range).

*Use a circuit tester (set to DC range).

Normal AC 104 – 126 V

12-6-5. Ignition Failure

Failure Display on Outdoor Unit PCB: ●● ● ● ●

1) Check ignition transformer.

➀Check if ignition wires are disconnected or have voltage leak.
➁Measure AC voltage between the connectors (CN07) to the ignition electrode.

In case of abnormality ➞ Replace outdoor unit PCB.

If voltage is normal but sparking noise cannot be heard, replace the ignition electrode.

Caution: If the ignition wires are disconnected, connect them by pushing them in firmly.

2) Check gas valve (GV1).

➀Measure DC voltage at the connector (CN08) of electromagnetic valve (under heating operation, during com-

bustion).

In case of abnormality ➞ Replace outdoor unit PCB.

Normal WHT – WHT DC 90 – 120 V

*Use a circuit tester (set to AC range).

*Use a circuit tester (set to DC range).

61

Normal ORG – ORG DC 90 – 120 V

Normal WHT – WHT 1 – 2.5 kΩ

Normal ORG – ORG 1 – 2.5 kΩ

In case of abnormality ➞ Replace heating electromagnetic valve.

➁Disconnect heating gas valve (GV1, CN08) connector, and measure resistance at connector.

In case of abnormality ➞ Replace outdoor unit PCB.

3) Check electromagnetic valve (GV2) of the combination gas valve.

➀Measure DC voltage at electromagnetic valve connector (CN08) (under heating operation, during combustion).

In case of abnormality ➞ Replace heating electromagnetic valve.

➁Disconnect heating electromagnetic valve connector (CN08), and measure resistance at connector.

Normal AC 104 – 126 V

In case of abnormality ➞ Replace outdoor unit PCB.

4) Check proportional control valve (PV).

➀Measure DC voltage at proportional valve connector (CN11) (under heating operation, during combustion).

In case of abnormality ➞ Replace flame rod.

5) Check flame rod.

➀Check if flame rod connector (CN17, 1P) is connected properly.
➁Measure AC voltage between flame rod connector and ground.

*Use a circuit tester (set to Ω range).

*Use a circuit tester (set to Ω range).

Normal BLU – BLU DC 5 – 30 V

*Use a circuit tester (set to DC range).

*Use a circuit tester (set to AC range).

*Use a circuit tester (set to DC range).

In case of abnormality ➞ Replace flame rod.

➂Disconnect flame rod connector (CN17) and measure direct current at connector.

Normal DC 2µA or more

*Use a circuit tester (set to DC range).

12-6-6. Erroneous Flame-Out Condition

Failure Display on Outdoor Unit PCB: ● ●● ●● ●●

➀Check in same manner as “Failure Display ●● ● ● ●.”

62

12-6-7. Combustion Blower Motor Abnormal Revolution

Failure Display on Outdoor Unit PCB: ● ●● ●● ●

Check combustion blower motor.

➀Measure AC voltage at blower motor connector (CN05) (under heating operation, during combustion).

In case of abnormality ➞ Replace outdoor unit PCB.

In case of abnormality ➞ Replace combustion blower motor.

➁Disconnect combustion blower motor connector, and measure resistance at connector.

*Use a circuit tester (set to AC range).

*Use a circuit tester (set to Ω range).

Normal PUR – PUR AC 30 – 115 V

*Use a circuit tester (set to AC range).

Normal BLK – BLK AC 104 – 126 V

*Use a circuit tester (set to AC range).

Normal BLK – BLK AC 104 – 125 V

Normal BLK – BLK 300 – 500 Ω

Normal BLK – BLK 300 – 500 Ω

Normal PUR – PUR 10 – 30 Ω

12-6-8. ON/OFF Valve Failure

Failure Display on Outdoor Unit PCB: ● ● ●● ●●

Check ON/OFF valve coil (CN06).

➀Measure AC voltage at the ON/OFF valve coil connector (under heating operation, during combustion).

In case of abnormality ➞ Replace outdoor unit PCB.

In case of abnormality ➞ Replace ON/OFF valve coil.

➁Disconnect ON/OFF valve connector and measure resistance at connector.

*Use a circuit tester (set to Ω range).

12-6-9. Reversing Valve Failure

Failure Display on Outdoor Unit PCB: ● ● ●● ●

Check reversing valve coil.

➀Measure AC voltage at reversing valve coil connector (CN03) (under heating operation, during combustion).

In case of abnormality ➞ Replace outdoor unit PCB.

In case of abnormality ➞ Replace reversing valve coil.

➁Disconnect reversing valve coil connector and measure resistance at connector.

Caution: Reversing valve failure can be displayed when there is a shortage of refrigerant. Therefore if the

above check shows normal, check the amount of refrigerant.

*Use a circuit tester (set to Ω range).

63

12-7. Reset Method When Error Occurs During Heating Operation

Wait for 4 minutes or more after the power is on, and then press the operation button on the remote control unit.

12-8. Failure Display on Outdoor Unit and Correction Method

No. Caused by (outdoor unit) LED lamps

Meaning

Error Detected Points to Diagnose Correction Methods

2 3 4 5

— Normal ●● ●● ●● ●● Normal operation — — —
— Defect in IC chip (E

2

PROM) ●● ●● ●● ●

— Defective Gas Valves ●● ●● ● ●●

A Defective Thermistor 1 ●● ●● ●●

B Defective Thermistor 2 ●● ● ●● ●●

C Limit switch ●● ● ●● ●

D Flame Current Circuit ●● ●●●●

E Lighting failure ●● ●●●

F Lost flame ● ●● ●● ●●

G Incorrect combustion motor speed ● ●● ●● ●

H Over-time period in retry ● ●● ● ●●

I Over number of times in retry ● ●● ●●

J Bypass Valve (V2) not open ●●●● ●●

— Reversing Valve not working ●●●● ●

Gas switching IC (EEP-ROM) data was not
read properly by microcomputer upon
power-on

Electricity applied to GV1 / GV2 while gas
valve is closed

Open / short circuit of Thermistor 1

Open / short circuit of Thermistor 2

Temperature fuse / temperature limiting
switch operated

Flame current detected while combination
gas valve is closed

Fail to ignite by ignition operation (including
retry)

Extinction after flame detection, and does
not re-try (burning after re-try, yet extin­guishes within 4 minutes)

Inadequate revolution speed

➀At ignition:

Does not reach 500rpm within 20 sec­onds
Reaches 500rpm within 20 seconds yet
does not reach prescribed revolutions
(approx. 1,850rpm) within 60 seconds

➁Less than 500rpm (other than ignition)

Thermistor 1 and/or Thermistor 2 do not
cool down to normal temperature within 10
minutes after being heated up to a speci­fied temperature (gas is cut off when over­heating)

Fourth overheating is detected. Retry is
performed up to 3 times when Thermistor 1
and / or Thermistor 2 cool down to normal
temperature within 10 minutes

Thermistor 2 does not detect temperature
increase (approx. xx°F (2°C)) within 30 sec­onds after ON/OFF valve (RV2) is ON

Thermistor 1 fails to detect temperature
increase (approx. xx°F (1°C)) within 30 sec­onds after ON/OFF valve (V1) is open at
ignition operation

Can not read IC chip data or miss­ing IC chip on outside PCB

Detect abnormality in Gas Valve
Circuit at initial checking

Open or Short of Thermistor 1

Open or Short of Thermistor 2

Thermal fuse or Bimetal Thermostat
tripped

Abnormality in Flame Current
Circuit

Could not establish flame

Flame Sensor Circuit detects lost
flame and could not establish the
flame

Incorrect combustion motor speed

Thermistor 1 or Thermistor 2 tem­perature did not go down during set
period

Combustion stopped by Ther mistor
1 or Thermistor 2 more than set
number

Bypass Valve failure or drop-out of
Thermistor 2

Reversing Valve failure, drop-out of
Thermistor 2, or shortage of refr ig­erant

● Confir m proper inser tion of gas switching

IC, then reset power supply

● Measure voltage of GV1 (WHT – WHT of I)

and GV2 (ORG – ORG of I) (normal value:
DC0V)

● Measure resistance of Thermistor 1 (BLK –

BLK of M.) (normal value: 6.6±0.5 kΩ at
68°F (20°C))

● Measure resistance of Thermistor 2 (BLK –

BLK of K.) (normal value: 6.6±0.5 kΩ at
68°F (20°C))

● Check continuity of temperature fuse and

temperature limiting switch (YEL – YEL of
P) (normal value: 1Ω or less)

● Measure electric current between BLK of

flame rod and CN17(J) on the PCB (nor­mal value: 0 µA, combination gas valve
closed)

● Measure electric current between BLK of

flame rod and CN17(J) on the PCB (nor­mal value: 3 µA or more at ignition)

● Check positioning of ignition plug, flame

rod and burner (normal: electric discharge
gap approx. 4mm)

● Confir m sparking noise at the igniter

As above

● Check revolution of combustion blower fan

● Measure voltage of combustion blower

motor (PLE – PLE of D) (normal value: AC
30 – 115 V)

● Check for refrigerant leaks (pressure in

wide tube while cooling operation: approx.

85.0 PSIG (6 kgf/cm

2

)

As above

● Check position of Thermistor 2.

● Measure voltage at ON/OFF valve (RV2)

(BLK – BLK of F) (normal value: AC 104 –
126 V, ON)

● Check for refrigerant leakage

● Check position of Thermistor 1

● Measure voltage at reversing valve (BLK –

BLK of B) (normal value: AC 104 – 126 V,
ON)

➀ Replace gas switching IC chip
➁ Replace outdoor unit PCB

➀ Replace outdoor unit PCB

➀Check / modify Connector CN 15 (M)
➁ Replace Thermistor 1
➂ Replace outdoor unit PCB

➀Check / modify connector CN 16 (K)
➁ Replace Thermistor 2
➂ Replace outdoor unit PCB

➀Check / modify connector CN12 (P)
➁ Replace thermal fuse
➂Replace bimetal thermistor

➀Replace flame sensor probe (CN17)
➁ Replace outdoor unit PCB

➀Check / modify connector CN17 (J)
➁Check / modify connector CN7 (G)
➂Replace ignition electrode
➃Check / modify insertion of wire on secondar y

side of ignition transformer

➄Replace flame rod
➅Replace ignition transformer
➆

Replace outdoor unit PCB or power transformer

As above

➀Check / modify connector CN5 (D)
➁Check / modify connector CN14 (N)
➂Replace combustion blower fan motor set
➃Replace outdoor unit PCB

➀Repair refrigerant tubes (connections, etc.)

(leaks)

➁Charge additional refrigerant (leaks)
➂Replace units

As above

➀Confirm / modify position of Thermistor 2
➁Confirm / modify connector CN6 (F)
➂Replace ON/OFF valve 2 (coil)
➃Replace outdoor unit PCB
➄Replace units

➀Repair refrigerant tubes (connections, etc.)

(leaks)

➁Charge additional refrigerant (leaks)
➂Check / modify position of Thermistor 1
➃Check / modify connector CN03 (B)
➄Replace reversing valve (coil)
➅Replace outdoor unit PCB

Note: Failure display remains even after power reset following repairs.The display is overridden upon operation of compressor when heating operation is carried out for a second time after the repair.

64

65

13. SPECIAL PRECAUTIONS WHEN SERVICING THE UNIT

Important!
For your personal safety, be sure to read and understand the following

precautions before servicing.

● To avoid risk of injury when servicing the outdoor unit (for instance, when replacing the compressor or repair-

ing a refrigerant leak), follow the procedure below for the refrigerant circuits of the outdoor unit.

PROCEDURE
13-1. BLK/WHT Connector Attachment for Servicing

13-1-1. Confirm mains power is switched OFF, then, detach the connectors (BLK and WHT) for the electromag-

netic valves, SV1 and SV2, from the terminals CN4 and CN6 on the PCB.

13-1-2. Connect the special connector (field supply) and the connector (BLK and WHT). Following this, re-apply

power at 115V and open the electromagnetic valves, SV1 and SV2.

13-1-3. Provide a disconnect switch to the special connector.
13-1-4. Turn the disconnect switch ON to supply power (single-phase, 115V) to the special connector. This

makes it possible to force open 2 solenoid valves (SV1 and SV2) in the refrigeration circuit outdoor unit.
(Fig. 3)

Injuries can occur from burns or inhalation of toxic gas if servicing is per­formed while refrigerant remains in the refrigeration circuit. This servicing
includes disassembling brazed tubing connections and removing any
refrigeration parts or components.

WARNING

Important!

The procedures given in “13-2” to “13-5” below must be carried out with the 2 solenoid valves SV1
and SV2 open.

Fig. 1

● Condition at shipping and operation ● Condition at servicing

Power supply

Black

CN4

CN6

AC115V

White

V2

V1

Connectors for servicing

Disconnect switch (Field supply)

Special
connector

Black

White

V2

Outdoor PCB

Outdoor PCB

CN4

CN6

V1

13-2. Refrigerant Recovery

13-2-1. Open service valve to recover refrigerant into refrigerant

recovery unit.

13-3. Service on Outdoor Unit

13-3-1. After making sure that the refrigerant in the circuit has

been completely discharged, perform required servicing,
such as replacing the compressor or repairing refrigerant
leaks.

13-3-2. Before going on to the next step, leak test all joints where

welding has been done.

Nitrogen gas is best when pressurizing the system for a
leak test. However, if it is necessary to instead test with
refrigerant gas, be sure to recover all gas into the refriger­ant recovery unit after completing the leak test.

13-4. Evacuation Using Vacuum Pump

13-4-1. Using a hex wrench, set the valve stems of the narrow

and wide tube service valves as indicated in the table
below.

Refer to Service Valve
Construction shown in Fig. 3.

NOTE

NOTE

Refrigerant released into the air contributes to
destruction of our planet’s ozone layer. You should
always use the refrigerant recovery unit to help
protect the environment.

CAUTION

Service Valve Valve Position

Narrow

Position – a –

Wide

Action

Narrow Tube Service

Valve (2-Way)

Wide Tube Service

Valve (3-way)

Fully OPEN

Position – a –

Position – b –

*

Hose

CLOSED

*

*

Fig. 2

Fig. 3

66

Outdoor unit

Pressure
gauge

Manifold valve

HiLo

Vacuum pump

67

13-4-2. Connect the vacuum pump and a manifold valve as shown Fig. 1. Confirm that all connections are cor-

rectly made.

In order to withstand negative suction pressure during evacuation, the manifold valve should be
equipped with a Hi/Lo compound gauge with a minimum scale reading of –76 cmHg.

13-4-3. Install (first by hand-tightening, then securely with a wrench) flare nuts and bonnets at service valves in

the refrigeration circuit where evacuation will take place. This process is highly important to completely
evacuate the system.

13-4-4. Check that the BLK/WHT connector is properly attached. (Fig. 1)
13-4-5. Turn the disconnect switch ON (if it has been OFF) to open the 2 solenoid valves (SV1 and SV2). (Fig. 2)
13-4-6. With both the “Lo” and “Hi” knobs of the manifold valve open, run the vacuum pump. The operation time

varies with the capacity of the pump. (Run the pump at least 30 minutes.) Evacuation is successful if
the vacuum gauge reading remains at –75 cmHg or more for at least 10 seconds after closing both the
“Lo” and “Hi” knobs of the manifold valve.

13-4-7. With the vacuum pump still running, turn both the narrow and wide service valves all the way in to close

the valves (position – b – in Fig. 3). Then stop the pump.

13-4-8. After removing the vacuum hoses from the service valves, replace the flare nuts and bonnets on the

valves. The refrigerant circuit is now ready for charging.

13-5. Refrigerant Charging

13-5-1. After evacuation is completed, charge the circuit with the proper amount of refrigerant.

The proper amount of refrigerant is specified on the nameplate of the outdoor unit and in Section
“2-1. Unit Specifications” in the service manual.

13-5-2. Use a hose to connect the narrow tube service valve to the

liquid port of the charging cylinder. (Fig. 4)

13-5-3. Purge air from the hose. Do this by opening the charging

cylinder valve, then slightly loosening the connection to the
narrow tube service valve. Wait a few moments, then
retighten the connection.

13-5-4. With a hex wrench, open the service valve little by little to

let liquid refrigerant enter the circuit. (Fig. 4)

Write down the gradation levels on the charging cylinder
before and after the charging. This allows you to calculate
the charging volume.

NOTE

NOTE

NOTE

Charging

volume

Gradation

level before

charging

Gradation

level after

charging

= –

Outdoor unit

Charging cylinder

Open

Fig. 4

68

13-5-5. If it is not possible to completely charge the unit with the proper amount of refrigerant, you can do an

additional charging after installing the units. At that time, refrigerant should be recharged in the liquid
state a little at a time using the wide tube service port, and the air conditioner should be operating in
COOLING mode during the entire charging process.

Charging the unit with a large amount of refrigerant at once may damage the compressor. Always
charge the unit at a constant charging rate of about 0.2 lb (100 g).

13-6. Reattaching BLK/WHT Connectors for Operation

13-6-1. Turn off the power source.
13-6-2. Connect the BLK/WHT connectors to each other as in the original state.

NOTE

Remember to reattach the BLK/WHT connectors in their original position. Otherwise, the system
will not operate correctly and damage may occur.

CAUTION

1

INSTRUCTION MANUAL

KGS 1411 + CG1411

APPENDIX

For Your Safety Read Before Operation

WARNING:

If you do not follow these instructions exactly, a fire or
explosion may result causing property damage,
personal injury or loss of life.

A. This appliance is supplied natural gas for heat

source into outdoor section.
Read the following safety information before
operation and/or maintenance is performed.

B. This appliance dose not have a pilot light. It is

equipped with an ignition device which
automatically lights the burner.
Do not try to light the burner by hand.

C. BEFORE OPERATING: Smell around the appliance

area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will
settle on the floor.

WHAT TO DO IF YOU SMELL GAS

•

Do not try to light any appliances.

•

Do not touch any electric switch; do not use
any phone in your building.

•

Immediately call your gas supplier from a
neighbor’s phone.
Follow the gas supplier’s instructions.

•

If you reach your gas supplier, call the fire
department.

D. Use only your hand to push in or turn the gas

control knob. Never use tools. If the knob will not
push in or turn by hand, don’t try again call a
qualified service technician. Attempting to repair
the appliance may result in a fire or explosion.

Operating Instruction

1. STOP! Read the safety information above in this

manual.

2. Manual Shutoff valve shall be turned off when

heating is not operating.

3. Turn off the electric power supply when the

manual shutoff valve is turn on. Wait five
minutes, and then smell for gas, including near
the floor.
If you smell gas, STOP! Follow ‘‘C’’ in the safety
information above on this manual.
If you don’t smell gas, go to the operating
instructions.

Installation Instruction

The installation must conform with local codes or, in
the absence of local code, with the National Fuel
Gas Code:

ANSI Z223.1/NFPA 54

and National Electric Code:

ANSI/NFPA 70.

E. Do not use this appliance if any part is

underwater. Immediately call a qualified service
technician to inspect the appliance and to replace
any part of the control system and any gas
control which has been underwater.

2 OI-202-02EG

Contents

Page

For Your Safety Read Before Operation ............................................................. 2

Product Information .............................................................................................. 3

Alert Symbols ........................................................................................................ 3

Features.................................................................................................................. 4

Installation Location.............................................................................................. 5

Electrical Requirements ........................................................................................ 5

Safety Instructions ................................................................................................ 6

Names of Parts ...................................................................................................... 7

Using the Remote Control Unit ......................................................................... 12

Operation with the Remote Control Unit.......................................................... 14

1. Automatic Operation ............................................................................ 14

2. Manual Operation ................................................................................. 16

3. Adjusting the Fan Speed...................................................................... 17

4. Fan Only ................................................................................................. 18

5. Night Setback Mode ............................................................................ 18

Special Remarks ................................................................................................. 20

Using the 12-Hour ON and OFF Timer ............................................................. 21

Using the 1-Hour OFF Timer.............................................................................. 22

Adjusting the Airflow Direction ......................................................................... 23

Operation without the Remote Control Unit .................................................... 24

Care and Cleaning............................................................................................... 24

Troubleshooting................................................................................................... 27

Tips for Energy Saving ...................................................................................... 27

Operating Range ................................................................................................. 27

Product Information

If you have problems or questions concerning your Air Conditioner, you will
need the following information. Model and serial numbers are on the
nameplate on the bottom of the cabinet.

Model No.

Date of purchase

Dealer’s address

Serial No.

Phone number

Alert Symbols

The following symbols used in this manual, alert you to potentially
dangerous conditions to users, service personnel or the appliance:

This symbol refers to a hazard or unsafe
practice which can result in severe personal
injury or death.

CAUTION

This symbol refers to a hazard or unsafe
practice which can result in personal injury
or product or property damage.

3OI-202-03EG

Features

This air conditioner is equipped with cooling, drying and heating functions. This air conditioner is a
refrigerant heating type unit which uses combustion gas to heat the outdoor coil refrigerant during heating
operation. Details on these functions are provided below; refer to these descriptions when using the air
conditioner.

•

Microprocessor Controlled Operation

The interior compartment of the remote control
unit contains several features to facilitate
automatic operation, each logically displayed for
easy use.

•

Simple One-touch Wireless Remote Control

The remote control unit has several features to
facilitate automatic operation.

•

12-Hour ON or OFF Timer

This timer can be set to automatically turn the
unit on or off at any time within a 12 hour
period.

•

1-Hour OFF Timer

This timer can be set to automatically turn off
the unit at any time after one hour.

•

Night Setback

Pressing this button changes the setting of the
room temperature thermostat, allowing you to
set the temperature at whatever level that you
find comfortable.

•

Automatic and 3-step Fan Speed

Auto/High/Medium/Low

•

Air Sweep Control

This function moves a flap up and down in the
air outlet, directing air in a sweeping motion
around the room and providing comfort in every
corner.

•

Automatic Switching between Cooling and
Heating

This unit automatically selects cooling
operation, heating operation or drying operation
according to the difference between the room
temperature and the temperature setting when
operation starts.

•

Automatic Restart Function for Power Failure

Even when power failure occurs, preset pro­grammed operation can be reactivated once
power resumes.

•

Anti-Mold Filter

This unit is equipped with an anti-mold filter
that inhibits the growth of mold and bacteria.

•

Optional Air Clean Filter

An air filter that uses activated charcoal to
eliminate unpleasant odors and clean the air is
available (sold separately).

4 OI-202-04EG

Installation Location

•

We recommend that this air conditioner be installed properly by
qualified installation technicians in accordance with the Installation
Instructions provided with the unit.

•

The outdoor unit has been designed for outdoor use. It should never
be used inside. This could result in incomplete combustion and is
extremely dangerous.

•

Use only the gas types indicated on the name plate. This plate is
located on the right side of the outdoor unit and should be checked
before connecting the gas line.

•

Before installation, check that the voltage of the electric supply in
your home or office is the same as the voltage shown on the
nameplate.

•

Do not install this air conditioner where there are fumes or flammable
gases, or in an extremely humid space such as a greenhouse.

•

Do not install the air conditioner where excessively high heat­generating objects are placed.

Avoid: To protect the air conditioner from heavy corrosion, avoid installing the

outdoor unit where salty sea water can splash directly onto it or in
sulphurous air near a spa.

Electrical Requirements

1. All wiring must conform to the local electrical codes. Consult your

dealer or a qualified electrician for details.

2. Each unit must be properly grounded with a ground (or earth) wire or

through the supply wiring.

3. Wiring must be done by a qualified electrician.

5OI-202-05EG

Safety Instructions

•

Read this Instruction Manual carefully before using this air conditioner.
If you still have any difficulties or problems, consult your dealer for
help.

•

This air conditioner is designed to give you comfortable room
conditions. Use this only for its intended purpose as described in this
Instruction Manual.

•

Never use or store gasoline or other flammable vapor or liquid near
the air conditioner — it is very dangerous.

•

This air conditioner has no ventilator for intaking fresh air from
outdoors. You must open doors or windows frequently when you use
gas or oil heating appliances in the same room, which
consume a lot of oxygen from the air. Otherwise there is a risk of
suffocation in an extreme case.

CAUTION

•

Do not turn the air conditioner on and off from the power mains
switch. Use the ON/OFF operation button.

•

Do not stick anything into the air outlet of the outdoor unit. This is
dangerous because the fan is rotating at high speed.

•

Do not let children play with the air conditioner.

•

Do not cool or heat the room too much if babies or invalids are
present.

•

Use only AGA or CGA certified natural gas for this unit.
If L.G. gas is to be used, be sure to first consult with your installer or
local dealer.

•

If the designated gas is not used, proper combustion may not take
place. This could result in an accident and personal injury.

6 OI-202-06EG

Names of Parts

Air intakes

Air outlet

Remote
control
unit

INDOOR UNIT

Drain hose

Combustion Lamp

OUTDOOR UNIT

Air outlet

NOTE

Air Intakes Air from the room is drawn into these sections and passes through

Air Outlet Air is blown out of the air conditioner through the air outlet.

Remote Control Unit The wireless remote control unit controls power on/off, operation

Refrigerant Tubes The indoor and outdoor units are connected by copper tubes

Drain Hose Moisture in the room condenses and drains off through this hose.

Outdoor (Condensing) Unit The outdoor unit contains the compressor, fan motor, heat

Combustion Lamp The combustion lamp indicates the burner status. It turns on

This illustration is based on the external appearance of a standard model.
Consequently, the shape may differ from that of the air conditioner you
have selected.

This air conditioner consists of an indoor unit and an outdoor unit.
You can control the air conditioner with the remote control unit.

air filters which remove dust.

mode selection, temperature, fan speed, timer setting, and air
sweeping.

through which refrigerant gas flows.

exchanger coil, gas combustion components (combustion burner,
fan, fan motor, heat exchanger) and other electrical components.

during operation and flashes when something is wrong.

Refrigerant tubes

7OI-202-07EG

Unit Display and Operation Selector

Operation selector

INDOOR UNIT

IMPORTANT

Avoid using radio equipment
such as mobile phones near
(within 1 m of) the indoor unit.
Some radio equipment may
cause the unit to malfunction.

If the trouble occurs, disconnect
power and restart the air
conditioner after a few minutes.

REMOTE CONTROL

receiver

Operation selector

ON position This position is for operating the air conditioner with the wireless

OFF position Switch the selector to the OFF position if you are not going to use

ON

OFF

TEST

Remote control receiver

OPERATION

TIMER

OPERATION lamp
TIMER lamp

This section picks up infrared signals from the remote control unit
(transmitter).

remote control unit.
Set the selector normally in this position.

the air conditioner for a few days or longer.

The OFF position does not disconnect the power. Use the main
power switch to turn off power completely.

TEST position This position is used only when servicing the air conditioner.

•

To operate in the TEST position, first select DRY, COOL, or HEAT
mode with the selector in the ON position, and then switch the
selector to the TEST position. However, the air conditioner will
not operate when set to the TEST position if it has been stopped
by setting to the OFF position.

•

During TEST mode, the OPERATION lamp and timer lamp flash,
and remote control operation does not work.

CAUTION

Do not set at the TEST position for normal operation.

OPERATION lamp This lamp lights when the system is in the continuous DRY,

COOL, FAN and HEAT mode.

TIMER lamp This lamp lights when the system is being controlled by the timer.

8 OI-202-08EG

Remote Control Unit (Display)

Displayed when setting temperature

SET TEMP.

NORMAL

1

HR.

Displayed when transmitting data

Displayed when the comfortable
temperature and operating mode for the
customer is set automatically.

(1) Operation mode

AUTO.......................................

HEAT........................................

MILD DRY................................

COOL .......................................

H

ON

OFF

Symbols

Displayed when setting timer

(3) Temperature setting

60–88°F

When set to 82 °F ...........

Current temperature

indication .........................

(4) Timer

12-hour ON Timer..................

12-hour OFF Timer.................

ON
OFF

FAN ..........................................

(2) Fan speed

AUTO.......................................

HIGH ........................................

MEDIUM..................................

LOW.........................................

1-hour OFF Timer...................

(5) NIGHT SETBACK ....................

(6) Confirmation of

transmission ...........................

(7) Flap

AUTO.......................................

Angle indication .....................

Sweep indication....................

1

HR.

9OI-202-09EG

Remote Control Unit

SET TEMP.

NORMAL

Display

H

1

HR.

ON
OFF

Transmitter

ON/OFF operation button

1 HR. TIMER button

FAN SPEED selector button

FLAP button

TIMER ON button

TIMER OFF button

SET button

CANCEL button

NOTE

(Cover closed)

1HR.

TIMER

ON

OFF

TEMP.

TEMP. setting buttons

FAN SPEED

FLAP

ON OFF

CANCEL

SET

BATTERIES

MODE

NIGHT

SETBACK

ACL

MODE selector button

NIGHT SETBACK button

ACL button

Battery compartment
(Pull off the cover to expose the
batteries.)

The illustration above pictures the remote control unit after the cover has
been lowered and removed.

Transmitter When you press the buttons on the remote control unit, the mark

appears in the display and the setting changes are transmitted to the
receiver in the air conditioner.

Display Information on the operating status is displayed while the remote control

unit is switched on. If the unit is turned off, only the mode that was set
previously is still displayed.

NIGHT SETBACK button For details, see ‘‘Night Setback Mode’’. When you press this button in the

DRY, COOL or HEAT mode, the

mark appears in the display, and the
remote control unit automatically adjusts the set temperature to save
energy.

TEMP. setting buttons Press the

Press the

ON/OFF operation

This button is for turning the air conditioner on and off.

button to increase the temperature setting.
button to reduce the temperature setting.

button

TIMER ON button

TIMER OFF button

: The air conditioner starts at the set time.

ON

: The air conditioner stops at the set time.

OFF

10 OI-202-10EG

Remote Control Unit (continued)

MODE selector button

Green or red (AUTO)

Red (HEAT)

Orange (DRY)

Green (COOL)

Green (FAN)

FLAP button Press this button either to select to set the airflow direction to one of

NOTE

FAN SPEED selector

button

1 HR. TIMER button

(1-hour off timer)

Use this button to select the AUTO, DRY, COOL or FAN mode.

: When this setting is selected, the air conditioner calculates the

difference between the thermostat setting and the room
temperature and automatically switches to the ‘‘COOL’’ or

‘‘HEAT’’ mode as appropriate.
: The air conditioner makes the room warmer.
: The air conditioner reduces the humidity in the room.
: The air conditioner makes the room cooler.
: The air conditioner works only as a circulation fan.

the six possible positions manually, or to select the sweep function,
which moves the flap up and down automatically.

: The airflow direction is set automatically.
: The airflow direction can be set manually. (six positions)
: The flap moves up and down automatically.

To switch to the sweep function ( ) when in the manual ( ) mode,
hold down the FLAP button.

: The air conditioner automatically decides the fan speed.
: High fan speed
: Medium fan speed
: Low fan speed

: When you press this button, regardless of whether the unit is

1

HR.

operating or stopped, the unit operates for one hour and then

shuts down.

ACL button (All clear) Puts the remote control unit into pre-operation status. Always press

this button after replacing the batteries.

SET button After using the TIMER ON button or TIMER OFF button to set the timer,

press this button to activate the new setting.

CANCEL button Press this button to cancel the current timer setting.

11OI-202-11EG

How to Install Batteries

Using the Remote Control Unit

1. Slide the cover in the direction indicated by

the arrow and remove it.

2. Install two AAA alkaline batteries. Make sure

the batteries point in the direction marked in
the battery compartment.

NOTE

How to Use the Remote

Control Unit

ACL button

3. Use a thin object such as the tip of a pen to

press the ACL button.

Cover

•

The batteries last about six months, depending on how much you use
the remote control unit. Replace the batteries when the remote control
unit’s display fails to light, or when the remote control cannot be used
to change the air conditioner’s settings.

•

Use two fresh leak-proof type-AAA alkaline batteries.

•

In replacing batteries, follow the instructions as mentioned in the
sub-section ‘‘How to Install Batteries’’.

•

If you do not use the remote control unit more than 1 month, take out
the batteries.

When using the remote control unit, always point the unit’s transmitter
head directly at the air conditioner’s receiver.

Air conditioner
(Indoor unit)

Receiver

Remote control

(Transmitter head)

unit

Remote Control Unit

Installation Position

DO NOT

The remote control unit may be operated either from a non-fixed position
or from a wall-mounted position. To ensure that the air conditioner operates
correctly, DO NOT install the remote control unit in the following places:

•

In direct sunlight

•

Behind a curtain or other places where it is covered

•

More than 26 feet (8 m) away from the air conditioner

•

In the path of the air conditioner’s airstream

•

Where it may become extremely hot or cold

•

Where it may be subject to electrical or magnetic noise

•

Where there is an obstacle between the remote control unit and air
conditioner (since a check signal is sent from the remote control unit
every 3 minutes)

12 OI-202-12EG

Mounting the Remote

Control Unit

Removable mounting Non-removable mounting

Using the Remote Control Unit (continued)

Wall

(Packed with
the indoor unit)

Mounting on a wall A. Removable mounting

1) Momentarily hold the remote control unit at the desired mounting
position.

2) Confirm that the air conditioner responds correctly when you press
keys on the remote control from that position.

Wall

(Packed with the
indoor unit)

3) After confirming correct operation, use a screwdriver to screw the
mounting screw into the wall.

4) Hang the remote control unit from the mounting screw.

B. Non-removable mounting

1) Momentarily hold the remote control unit at the desired mounting
position.

2) Confirm that the air conditioner responds correctly when you press
keys on the remote control from that position.

3) After confirming correct operation, use a screwdriver to screw the
mounting screw into the wall.

4) Remove the batteries of the remote control unit.

5) Use a screwdriver to screw the remote control unit securing screw
into the wall through the hole in the battery compartment.

6) Replace the batteries.

7) Again confirm that the remote control unit operates correctly.

13OI-202-13EG

1. Automatic Operation

Operation with the Remote
Control Unit

SET TEMP.

NORMAL

NOTE

1HR.

TIMER

STEP 2

FLAP

Check that the circuit breaker on the power panel is turned on and that the
operation selector of the indoor unit is in the ON position.

Once the
below, you can have the air conditioner automatically bring the room to the
desired temperature simply by pressing the ON/OFF operation button.

STEP 1 Press the MODE selector to select .

STEP 2 Press the ON/OFF operation button.

mode is selected and the unit is preset by following the steps

ON

OFF

FAN SPEED

ON OFF

CANCEL

SET

TEMP.

MODE

STEP 1

NIGHT

SETBACK

To stop the air conditioner, press the ON/OFF operation button again.

•

NOTE

14 OI-202-14EG

To change the temperature setting, press the temperature setting
buttons and change the setting to the desired temperature.

•

The temperature setting changes by two degrees each time one of the
TEMP. buttons is pressed. The temperature setting may be changed

within a range of ±8 °F of the standard temperature. (The air conditioner

remembers the new temperature setting even when it is turned off.)

Operation with the Remote Control Unit (continued)

Press TEMP. to change the temperature setting.

To raise the temperature

TEMP.

setting

To lower the temperature
setting

•

The type of operation and the temperature setting will differ depending
on the ambient temperature when operation starts, as follows:

Ambient temperature

when operation starts

88 °F or higher

Operation

type

Temperature

setting

82 °F

Operation

Cooling

80 °F – less than 84 °F 78 °F

72 °F – less than 80 °F Dry 76 °F Orange

Less than 72 °F Heating 76 °F Red

•

The operation mode (cooling, heating, dry) does not change
automatically during operation.

•

Although the fan speed is set automatically, you can change the fan
speed by pressing the FAN SPEED selector button.

lamp

Green84 °F – less than 88 °F 80 °F

To stop the air conditioner, press the ON/OFF operation button again.

15OI-202-15EG

2. Manual Operation

Operation with the Remote Control Unit (continued)

SET TEMP.

NOTE

1HR.

TIMER

STEP 2

ON

OFF

TEMP.

STEP 3

STEP 4

STEP 5

FAN SPEED

FLAP
ON OFF

CANCEL

SET

MODE

STEP 1

NIGHT

SETBACK

Check that the circuit breaker on the power panel is turned on and that the
operation selector of the indoor unit is in the ON position.

If the automatic operation settings of the unit do not meet your needs,
press the setting buttons as described below and change the settings as
desired.

STEP 1 Press the MODE selector button and select the desired

mode.

For heating operation →
For dehumidifying operation →
For cooling operation →
For circulating operation →

STEP 2 To start the air conditioner, press the ON/OFF

operation button.

STEP 3 Press the TEMP. setting buttons to change the

temperature setting to the desired temperature.

Adjustable temperature range:

88 °F max.
60 °F min.

NOTE

The temperature setting changes by one degree each
time the button is pressed. It is not possible to change
the temperature setting when the unit is operating in the
fan mode. (The air conditioner remembers the new
temperature setting even when it is turned off.)

STEP 4 Press the FLAP button and set the airflow direction as

desired.
(Refer to ‘‘Adjusting the Airflow Direction’’ on
page 23.)

To stop the air conditioner, press the ON/OFF operation button again.

16 OI-202-16EG

Operation with the Remote Control Unit (continued)

•

NOTE

3. Adjusting the
Fan Speed

A. Automatic Simply set the FAN SPEED selector button to the position.

Choose the best position in the room for the remote control unit, which
also acts as the sensor for room comfort and transmits the operating
instructions. Once you’ve found this best position, always keep the
remote control unit there.

•

This appliance has a built-in 3-minute time delay circuit to ensure
reliable operation. When the operation button is pressed, the
compressor will start running within three minutes. In the event of
power failure, the unit will stop. When the power is restored, the unit
will restart automatically after three minutes.

A microcomputer in the air conditioner automatically controls the fan speed
when the
the difference between the room temperature and the set temperature is
detected by the microcomputer which then automatically switches the fan
speed to the most suitable level.

mode is selected. When the air conditioner starts operating,

Cooling and DRY mode:

Heating mode:

NOTE

When difference between
room temperature and set
temperature is

4 °F and over High

Between 4 °F and 2 °F Medium

Below 2 °F Low

When difference between
room temperature and set
temperature is

2 °F and over High

Below 2 °F Medium

The above table assumes that the sensor on the remote control is being
used. Actual operation may differ slightly from the operation described in
the table.

FAN SPEED

FAN SPEED

B. Manual If you want to adjust fan speed manually during operation, just set the FAN

SPEED selector as desired. [

, ,or ]

17OI-202-17EG

Operation with the Remote Control Unit (continued)

4. Fan Only

1HR.

TIMER

ON
OFF

TEMP.

STEP 2

STEP 3

FLAP

FAN SPEED

MODE

STEP 1

ON OFF

NIGHT

SET

BATTERIES

CANCEL

SETBACK

ACL

If you want to circulate air without any temperature control, follow these
steps:
STEP 1: Press the MODE selector button to switch to the fan mode

).

(

STEP 2: Press the ON/OFF operation button.
STEP 3: Press the FAN SPEED selector button to select the fan speed of

your choice (

If the fan speed is set to auto (

, , or ).

), the fan speed switches to low.

5. Night Setback Mode

SET TEMP.

NORMAL

SET

BATTERIES

ON

OFF

FAN SPEED

CANCEL

MODE

NIGHT

SETBACK
ACL

TEMP.

1HR.

TIMER

FLAP

ON OFF

The Night Setback Mode is used for saving energy.

Press the NIGHT SETBACK button while the air conditioner is operating.
The

mark appears in the display.

To cancel the night setback function, press the NIGHT SETBACK button
again.

18 OI-202-18EG

A. In Cooling and DRY

Mode:

(

and )

Operation with the Remote Control Unit (continued)

When the night setback mode is selected, the air conditioner
automatically raises the temperature setting 2 °F when 1 hour have
passed after the selection was made, and then another 2 °F after
another 1 hour have passed, regardless of the indoor temperature
when night setback was selected. This enables you to save energy
without sacrificing comfort. This function is convenient when gentle
cooling is needed.

Setting
temperature

2°F

B. In Heating Mode:

(

Press the
NIGHT SETBACK
button

)

When the night setback mode is selected, the air conditioner
automatically lowers the temperature setting 6 °F when 1 hour have
passed after the selection was made, and then another 8 °F after
another 2 hours have passed, regardless of the indoor temperature
when night setback was selected. This enables you to save energy
without sacrificing comfort. This function is convenient when gentle
heating is needed.

Setting
temperature

1 hour

Time

6°F

8°F

Press the
NIGHT SETBACK
button

1 hour

2 hours

Time

19OI-202-19EG

‘‘DRY’’ ( ) Operation

Special Remarks

How it works?

Heating ( ) Operation

Heating performance

Power failure

during operation

Clicking Sound

•

Once the room temperature reaches the level that was set, the unit
repeats the cycle of turning on and off automatically.

•

During DRY operation, the fan speed is automatically set to LOW or
VERY LOW; the fan speed then switches back and forth between LOW
(for 20 seconds) and VERY LOW (for 10 seconds).

•

‘‘DRY’’ operation is not possible if the indoor temperature is 59 °F or
less.

•

This air conditioner is a refrigerant heating type unit which uses
combustion gas to heat the refrigerant heater during heating operation.
The heating capacity is unaffected depending on the outdoor
temperature. However, if sufficient heat cannot be obtained with this air
conditioner, use another heating appliance in conjunction with it.

•

In the event of power failure, the unit will stop. When the power is
turned on again, the unit restarts within three minutes.

Clicking sound is

heard from the air

conditioner

Remote Control Unit

•

In heating or cooling operation, any plastic parts may expand or shrink
due to a sudden temperature change. In this event, a clicking sound
may occur. This is normal, and the sound will soon disappear.

•

The remote control unit sends the setting condition to the air
conditioner regularly at three minute intervals.

20 OI-202-20EG

Using the 12-Hour ON and OFF
Timer

1. TIMER ON mode
(Example)

H

ON

1HR.

TIMER

OFF

FAN SPEED

ON OFF

SETBACK

CANCEL

SET

BATTERIES

ACL

ON

TEMP.

MODEFLAP

NIGHT

After the length of time set for TIMER ON elapses, the unit begins
operating.

The display depicted at left indicates that the air conditioner will begin
operating in three hours.

Setting procedure:

STEP 1 Press the MODE selector button and select the desired

operation mode.
(See ‘‘Operation with the Remote Control Unit,’’ page 14.)

STEP 2 Press the TIMER ON button.

(For example, to set the timer to turn on the air
conditioner after three hours have elapsed, press the
TIMER ON button three times.)
The time can be set to from one to twelve hours, in one
hour steps.

1

2

3.......12

STEP 3 Press the SET button.

•

The display changes immediately to its status previous to timer setting,
but the

•

To check the status of the timer while it is counting down, press the SET

indication remains.

ON

button.

Cancellation procedure: Press the CANCEL button.

2. TIMER OFF mode
(Example)

H

ON

1HR.

TIMER

OFF

FAN SPEED

ON OFF

SET

BATTERIES

CANCEL

MODEFLAP

NIGHT

SETBACK
ACL

OFF

TEMP.

After the length of time set for TIMER OFF elapses, the unit stops
operating.

The display depicted at left indicates that the air conditioner will stop
operating in five hours.

Setting procedure:

STEP 1 Press the TIMER OFF button.

(For example, to set the timer to turn off the air
conditioner after five hours have elapsed, press the TIMER
OFF button five times.)
The time can be set to from one to twelve hours, in one
hour steps.

1

2

3.......12

STEP 2 Press the SET button.

•

The display changes immediately to its status previous to timer setting,
but the

•

To check the status of the timer while it is counting down, press the SET

indication remains.

OFF

button.

Cancellation procedure: Press the CANCEL button.

21OI-202-21EG

Using the 1-Hour OFF Timer

1. 1-Hour OFF Timer This function causes the unit to operate for one hour and then stop,

regardless of whether the unit is on or off when the button is pressed.

1HR.

TIMER

ON OFF

SET

1

ON

OFF

FAN SPEED

CANCEL

MODEFLAP

NIGHT

SETBACK

HR.

TEMP.

The

Setting procedure:

Regardless of whether the unit is operating or stopped, press the 1 HR.
TIMER button.

1

HR.

Cancellation procedure:

Press the ON/OFF operation button to turn the unit off, wait for the unit to
stop operating, and then press the ON/OFF operation button again. The
1-Hour Timer function is now cancelled and the unit operates normally.

indicator in the display indicates that this function is operating.

1

HR.

appears in the display.

BATTERIES

ACL

NOTE

2. Combining the 1-Hour
OFF Timer and 12-Hour
ON Timer

1

HR.

ON

ON

1HR.

TIMER

ON OFF

SET

OFF

FAN SPEED

CANCEL

TEMP.

MODEFLAP

NIGHT

SETBACK

•

If, while the 1-Hour Timer function is operating, the 1 HR. TIMER button
is pressed once to cancel the function and then again, the unit continues
to operate for one hour from that point in time and then stops.

•

If the 1 HR. TIMER button is pressed while the TIMER OFF function is
operating, the OFF Timer is cancelled and the unit stops operating one
hour later.

By combining the 1-Hour OFF Timer and 12-Hour ON Timer, it is possible to
have the unit operate for just one hour from the present time, and then
have it switch on again later at a time specified by you.

(Example) Having the unit operate for just one hour from the present time,

and then switch on again three hours from the present time.

Timer setting

Operate Stop Operate

1 hour 2 hours

3 hours

BATTERIES

ACL

Setting procedure:

STEP 1 Press the 1 HR. TIMER button.
STEP 2 Press the TIMER ON button and use the SET button to set

the unit to turn on three hours later.

•

NOTE

Set the 1-Hour OFF Timer and the 12-Hour ON Timer simultaneously.

Unless you set the 1-Hour OFF Timer and the 12-Hour ON Timer at the
same time, the 1-Hour OFF Timer may operate for one hour or more.

22 OI-202-22EG

Adjusting the Airflow Direction

1. Horizontal The horizontal airflow can be adjusted by moving the vertical vanes with

your hands to the left or right.

CAUTION

When the humidity is high, the vertical vanes should be in the front
position during the cooling or dehumidifying operation. If the vertical vanes
are positioned all of the way to the right or left, condensation may begin
to form around the air vent and drip down.

2. Vertical The vertical airflow can be adjusted by moving the flap with the remote

control unit. Do not move the flap with your hands. Confirm that the remote
control unit has been turned on. Use the FLAP button to set either the
sweep function or one of the six airflow direction settings.
(The maximum capacity is obtained at the position at 4.)

ON

1HR.

TIMER

OFF

FAN SPEED

ON OFF

CANCEL

SET

BATTERIES

A. Sweep function B. Setting the airflow manually

TEMP.

MODEFLAP

NIGHT

SETBACK
ACL

The flap starts moving up and down to
deliver air over the sweep range.

SWEEP

COOL

and

DRY

HEAT

Referring to the above illustration, use
the FLAP button to set the airflow
direction within the range used during
the heating, cooling, or dehumidifying
operation.

6

5

4

SWEEP

3

2

1

NOTE

CAUTION

•

The flap automatically closes when the unit is off.

•

During the heating operation, the fan speed will be very low and the
flap will be in the horizontal position (position 6) until the air being
blown out of the unit begins to warm. Once the air warms up, the flap
position and fan speed change to the settings specified with the remote
control.

•

Use the FLAP button on the remote control to adjust the position of the
flap. If you move the flap by hand, the flap position according to the
remote control and the actual flap position may no longer match. If this
should happen, shut off the unit, wait for the flap to close, and then turn
on the unit again; the flap position will now be normal again.

•

Do not have the flap pointed down during cooling operation.
Condensation may begin to form around the air vent and drip down.

23OI-202-23EG

INDOOR UNIT

OFF

TEST

Operation without the Remote
Control Unit

If you have lost the remote control unit or it has trouble, follow the steps
below.

ON

1. When the air conditioner is not running
If you want to turn on the air conditioner, switch the operation selector to
the OFF position, and then to the ON position.

Operation
selector

Casing and Grille

(Indoor Unit)

NOTE

2. When the air conditioner is running

If you want to turn off the air conditioner, switch the operation selector to
the OFF position.

The set temperature and fan speed are automatically set at the
last selection before stopping.

Care and Cleaning

1. For safety, be sure to turn the air conditioner off and also to
disconnect the power before cleaning.

2. Do not pour water on the indoor unit to clean it. This will damage
the internal components and cause an electric shock hazard.

Clean the casing and grille of the indoor unit with a vacuum cleaner brush,
or wipe them with a clean, soft cloth.

If these parts are stained, use a clean cloth moistened with a mild liquid
detergent. When cleaning the grille, be careful not to force the vanes out of
place.

CAUTION

24 OI-202-24EG

1. Never use solvents, or harsh chemicals when cleaning the indoor
unit. Do not wipe the plastic casing using very hot water.

2. Some metal edges and the fins are sharp and may cause injury if
handled improperly; be especially careful when you clean these
parts.

3. The internal coil and other components of the outdoor unit must
be cleaned every year. Consult your dealer or service center.

Care and Cleaning (continued)

Anti-mold filter The anti-mold filter behind the air intake grille should be checked and

cleaned at least once every two weeks.

Air intake grille

How to remove the

anti-mold filter

Cleaning Use a vacuum cleaner to remove light dust. If there is sticky dust on the

1. Grasp both ends of the

air intake grille and pull
it out and up.

2. Push the anti-mold

filter up slightly, and
then pull
it down.

Anti-mold filter

filter, wash the filter in lukewarm, soapy water, rinse it in clean water and
dry it.

How to replace the

anti-mold filter

1. With the ‘‘FRONT’’ mark facing

you, slide the anti-mold filter
up into the unit and then lower
the handle into the groove on
the unit.

2. After installing the anti-mold

filter, press the locations
marked by the arrows (
and close the air intake grille.

)

Air intake grille

Anti-mold
filter

Insert into the groove on the unit.

25OI-202-25EG

Care and Cleaning (continued)

Air cleaning filter

(not provided)

NOTE

How to install the air

cleaning filter

Cleaning the main unit and

remote control unit

The air cleaning filter removes dust and dirt from the air, and reduces odors
and smoke from tobacco.

The air cleaning filter is not provided with the air conditioner and must be
purchased separately. The first time that you buy the air clean filter, it is
necessary to get the STK-ARF4B-50 model with frame. When changing the
filter subsequently, it is only necessary to replace the filter itself (model

STK-F4B-50).

The air cleaning filter cannot remove harmful gases or vapors nor ventilate
air in the room. You must open doors or windows frequently when you use
gas or oil heating appliances. Otherwise there is a risk of suffocation in
extreme cases.

The air cleaning filter needs to be
installed behind the anti-mold filter.

1. Remove the anti-mold filter.

2. Install the air cleaning filter in

Air
clean
filter

the position shown in the
diagram, with the

’’ symbols (meaning

‘‘
‘‘FRONT’’) facing the front.

3. Reinstall the anti-mold filter.

•

Wipe clean using a soft, dry
cloth.

•

To remove stubborn dirt, moisten a cloth in warm water no hotter than
104 °F, wring thoroughly, and then wipe.

•

The air intake grille can be removed in order to wash it with water.

Removing and remounting

the air intake grille

CAUTION

Washing the grille with

water

•

With the air intake grille open

Air intake grille

all the way, grip both arms
with your hands and pull

Arm

toward you to remove.
To remount, hold the air
intake grille roughly
horizontal and push it in until
the arm shafts fit into the
indentations in the main unit,
then fit the grille into place.

When using a footstool or the like, be careful not to let it tip over.

•

Clean the grille gently using a soft sponge, or the like. Then wipe away
any remaining moisture.

•

Neutral detergent may be used to remove stubborn dirt. Then rinse
thoroughly with water and wipe away any remaining moisture.

26 OI-202-26EG

Troubleshooting

If your air conditioner does not work properly, first check the following points before requesting service. If it
still does not work properly, contact your dealer or service center.

Trouble Possible Cause Remedy

Air conditioner does not run
at all.

OPERATION lamp flashes
and air conditioner does not
operate.

Compressor runs but soon
stops.

Poor cooling (or heating)
performance.

Clicking sound is heard from
the air conditioner.

OPERATION lamp lights but
outdoor unit will not run.

1. Power failure. 1. Restore power.

2. Leakage circuit breaker tripped. 2. Contact service center.

3. Line voltage is too low. 3. Consult your electrician or dealer.

4. Operation button is OFF. 4. Press the button again.

5. Batteries in remote control unit have run
down.

Trouble in wiring system. Contact service center.

Obstruction in front of condenser coil. Remove obstruction.

1. Dirty or clogged air filter. 1. Clean air filter to improve airflow.

2. Heat source or many people in room. 2. Eliminate heat source if possible.

3. Doors and/or windows are open. 3. Shut them to keep the heat (or cold) out.

4. Obstacle near air intake or air discharge
port.

5. Thermostat is set too high for cooling (or
too low for heating).

6. (Outdoor temperature is too low.) 6. (Consult your dealer or try to use a

In heating or cooling operation, any plastic
parts may expand or shrink due to a
sudden temperature change. In this event,
a clicking sound may occur.

1. The use of portable telephones near the
air conditioner may cause disturbance to
its normal operation.

5. Replace batteries.

4. Remove it to ensure good airflow.

5. Set the temperature lower (or higher).

back-up heater.)

This is normal, and the sound will soon
disappear.

1. Turn off the power then restart the air
conditioner after 1 minute.

2. Consult your dealer.

Tips for Energy Saving

Do not

Do

•

Block the air intake and outlet of the unit. If they are obstructed, the
unit will not work well, and may be damaged.

•

Let direct sunlight into the room. Use sunshades, blinds or curtains. If
the walls and ceiling of the room are warmed by the sun, it will take
longer to cool the room.

•

Always try to keep the air filter clean. (Refer to ‘‘Care and Cleaning’’.)
A clogged filter will impair the performance of the unit.

•

To prevent conditioned air from escaping, keep windows, doors and any
other openings closed.

Operating Range

The air conditioner is operable within the temperature ranges as listed below:

Temperature Indoor Air Intake Temp. Outdoor Air Intake Temp.

COOLING

HEATING

Maximum 95 °F DB/71 °F WB 115 °F DB
Minimum 67 °F DB/57 °F WB 67 °F DB
Maximum 80 °F DB/67 °F WB 75 °F DB/65 °F WB
Minimum — DB/— WB 0 °F DB/−2 °F WB

27OI-202-27EG

For Parts or Service Contact
SANYO FISHER SERVICE CORPORATION
A DIVISION OF SANYO LOGISTICS CORPORATION
1411 West 190th Street, Suite 800, Gardena, CA 90248 U.S.A.
50 Beth Nealson Drive, Toronto, Ontario, M4H 1M6, CANADA