Carrier 619FB User manual

Service Manual
619FB/538FR
High---Wall Ductless Split System
Sizes 009 to 018
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
MODEL / SERIAL NUMBER NOMENCLATURE 2.........
STANDARD FEATURES AND ACCESSORIES 3...........
SPECIFICATIONS 4...................................
DIMENSIONS 5......................................
CLEARANCES 7.....................................
ELECTRICAL DATA 7................................
WIRING 8...........................................
CONNECTION DIAGRAM 8...........................
WIRING DIAGRAMS 9................................
REFRIGERATION SYSTEM DIAGRAM 12...............
REFRIGERANT LINES 13.............................
CONTROL SYSTEM 14...............................
SYSTEM SAFETIES 14................................
SEQUENCE OF OPERATION 15........................
MODES OF OPERATION 15............................
TROUBLESHOOTING 18..............................
SAFETY CONSIDERATIONS
Installing, starting up, and servicing air--conditioning equipment
can be hazardous due to system pressures, electrical components,
and equipment location (roofs, elevated structures, etc.).
Only trained, qualified installers and service mechanics should
install, start--up, and service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning coils. All other operations should be performed by
trained service personnel.
When working on the equipment, observe precautions in the literature
and on tags, stickers, and labels attached to the equipment.
Follow all safety codes. Wear safety glasses and work gloves. Keep
a quenching cloth and fire extinguisher nearby when brazing. Use
care in handling, rigging, and setting bulky equipment.
Read this manual thoroughly and follow all warnings or cautions
included in literature and attached to the unit. Consult local building
codes and National Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety--alert symbol !!.
When you see this symbol on the unit and in instructions or manuals,
be alert to the potential for personal injury. Understand these signal
words: DANGER, WARNING, and CAUTION. These words are
used with the safety--alert symbol. DANGER identifies the most
serious hazards which will result in severe personal injury or death.
WARNING signifies hazards which could result in personal injury or
death. CAUTION is used to identify unsafe practices which may
result in minor personal injury or product and property damage.
NOTE is used to highlight suggestions which will result in enhanced
installation, reliability, or operation.
!WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF
position. There may be more than 1 disconnect switch.
Lock out and tag switch with a suitable warning label.
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
!WARNING
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Do not bury more than 36 in. (914 mm) of refrigerant pipe
in the ground. If any section of pipe is buried, there must be
a 6 in. (152 mm) vertical rise to the valve connections on
the outdoor units. If more than the recommended length is
buried, refrigerant may migrate to the cooler buried section
during extended periods of system shutdown. This causes
refrigerant slugging and could possibly damage the
compressor at start--up.
INTRODUCTION
This Service Manual provides the necessary information to service,
repair, and maintain the 619FB/538FR family heat pumps. Section
2 of this manual is an appendix with data required to perform
troubleshooting. Use the Table of Contents to locate a desired
topic.

2
MODEL / SERIAL NUMBER NOMENCLATURES
QEB
SYSTEM TYPE
Q=HEATPUMP
VOLTAGE
E= 208---230/1/60
INDOOR UNIT
619 F GA009
619 = FAN COIL UNIT
F=MODEL GA = ALL MODELS
NOMINAL CAPACITY
009 --- 3/4TON
012 --- 1 T O N
018 --- 1 --- 1 / 2 T O N S
INDOOR FAN COIL TYPE
B=HIGHWALL(GRAYCOLOR
H= HIGH WALL (WHITE COLOR)
B
MAXIMUM NUMBER OF FAN COIL UNITS THAT
CAN BE CONNECTED TO THE OUTDOOR UNIT
B=1:1
QER
SYSTEM TYPE
Q=HEATPUMP
VOLTAGE
E= 208---230/1/60
OUTDOOR UNIT
538 F GA009
538 = OUTDOOR UNIT
F=MODEL GA = ALL MODELS
NOMINAL CAPACITY
009 --- 3/4TON
012 --- 1 T O N
018 --- 1 --- 1 / 2 T O N S
UNIT TYPE
R= OUTDOOR UNIT
B
MAXIMUM NUMBER OF FAN COIL UNITS THAT
CAN BE CONNECTED TO THE OUTDOOR UNIT
B=1:1
01 15 10001
Week of Manufacture
Year of Manufacture
Sequential Serial Number
V= ALL MODELS
V
Use of the AHRI Certified
TM Mark indicates a
manufacturer’s
participation in the
program For verification
of certification for individual
products, go to
www.ahridirectory.org.

3
STANDARD FEATURES AND ACCESSORIES
Ease Of Installation
Mounting Brackets S
Low Voltage Controls S
Comfort Features
Microprocessor Controls S
Automatic Horizontal Air Sweep S
Air Direction Control S
Auto Restart Function S
Cold Blow Protection On Heat Pumps S
Freeze Protection Mode On Heat Pumps S
Turbo Mod e S
Silence Mode S
Auto Changeover On Heat Pumps S
46_FHeating Mode (Heating Setback) S
I FEEL Function S
Smart Phone Control S
80% Heating Capacity at --- 22_FS
Energy Saving Features
Sleep Mode S
Stop/Start Timer S
Safety And Reliability
3MinuteTimeDelayForCompressor S
Over Current Protection For Compressor S
Indoor Coil Freeze Protection S
Indoor Coil High Temp Protection in Heating Mode S
Condenser High Temp Protection in Cooling Mode S
Ease Of Service And Maintenance
Cleanable Filters S
Diagnostics S
Liquid Line Pressure Taps S
Application Flexibility
Condensate Pumps A
Crankcase Heater S
Base pan Heater S
Legend
SStandard
A Accessory
INDOOR UNITS
Fig. 1 – Condensate Pump Accessory
On high wall fan coils, the condensate pump has a lift capability of 12
ft (3.6 m) on the discharge side with the pump mounted in the fan coil
or 6 ft (1.8 m) on the suction side if the pump is remote mounted. The
pump is recommended when adequate drain line pitch cannot be
provided, or when the condensate must move up to exit.
OUTDOOR UNITS
Crankcase Heater
Standard on all unit sizes. Heater clamps around compressor oil
stump.

4
SPECIFICATIONS -- HEAT PUMP UNITS (FEQ SERIES)
System
Size 912 18
Outdoor Model 538FEQ009RBGA 538FEQ012RBGA 538FEQ018RBGA
Indoor Model (White) 619FEQ009HBGA 619FEQ012HBGA 619FEQ018HBGA
Indoor Model (Gray) 619FEQ009BBGA 619FEQ012BBGA 619FEQ018BBGA
Performance
Cooling Rated Capacity Btu/h 9,000 12,000 18,000
Cooling Cap. Range Min -- Max Btu/h 1,535~12,966 2,900~15,354 4,435~21,496
SEER 30.5 23.0 21.0
EER 15.8 12.8 12.5
Heating Rated Capacity Btu/h 9,000 13,000 19,000
Heating Cap. Range Min -- Max Btu/h 2,388~13,648 3,071~18,766 3,753~24,566
HSPF 10.3 10.3 10.3
COP W/W 4.19 3.12 3.09
Heating Capacity @ 5F Btu/h 9,000 12,185 18,521
Controls Wireless Remote Controller (°F/°C Convertible) Standard
Wired Remote Controller (°F/°C Convertible) Not available
Operating
Range
Cooling Outdoor DB Min -- Max °F0--129 0--129 0--129
Heating Outdoor DB Min -- Max °F-- 2 2 -- 7 5 -- 2 2 -- 7 5 -- 2 2 -- 7 5
Cooling Indoor DB Min --Max °F64--95 64--95 64--95
Heating Indoor DB Min --Max °F32~86 32~86 32~86
Piping
Total Piping Length Ft. 82 82 82
Piping Lift* Ft. 33 33 33
Pipe Connection Size -- Liquid In. 1/4” 1/4” 1/4”
Pipe Connection Size -- Suction In. 1/2” 1/2” 5/8”
Refrigerant
Type R410A
Design Pressure PSIG 550 550 550
Metering Device Electronic Expansion Valve
Charge Lb. 3.1 3.1 4.4
Outdoor Coil
Face Area Sq. Ft. 4.5 4.5 7.7
No. Rows 2.5 2.5 2
Fins per inch 18 18 18
Circuits 2 2 4
Indoor Coil
Face Area (sq. ft.) Sq. Ft. 2.3 2.3 2.3
No. Rows 2 2 2
Fins per inch 17 17 17
Circuits 4 4 4
Compressor
Type Rotary Rotary Rotary
Model QXAT--B121zE070 QXAT--B096zE070 QXAT--D20zF030
Oil Type FV50S 68EP RB68EP
Oil Charge Fl. Oz. 16.2 16.2 29.4
Rated Current RLA 8.5 9.5 14.5
Locked Rotor Amp LRA 35 40 30
Electrical
Voltage, Phase, Cycle V/Ph/Hz 208--230/1/60 208--230/1/60 208--230/1/60
Power Supply Indoor unit powered from outdoor unit
MCA A. 12 13 19
MOCP -- Fuse Rating A. 15 20 30
Outdoor
Unit Width In. 35.4 35.4 38.6
Unit Height In. 23.5 23.5 31.1
Unit Depth In. 14.9 14.9 16.8
Net Weight Lbs. 99.2 97.0 141.1
Airflow CFM 1412 1412 2354
Sound Pressure dB(A) 53 55 59
Indoor
Unit Width In. 37.8 37.8 37.8
Unit Height In. 12.6 12.6 12.6
Unit Depth In. 8.1 8.1 8.1
Net Weight (lbs.) Lbs. 30.9 30.9 30.9
Number of Fan Speeds 7 7 7
Airflow (lowest to highest) CFM 206/235/294/324/353/383/412 265/294/353/383/412/441/471 324/353/412/441/471/500/5
30
Sound Pressure (lowest to highest) dB(A) 22/24/26/30/34/38/41 23/25/27/31/35/39/42 26/28/31/35/39/43/48
Air throw Data Ft. 29.5 29.5 29.5

5
DIMENSIONS -- INDOOR
Fig. 2 – Indoor unit
Model W H D Q
09/12K 37 4/5 12 3/5 821/6
18K 37 4/5 12 3/5 823/4

6
DIMENSIONS -- OUTDOOR
Fig. 3 – Dimensions
Fig. 4 – Dimensions
Fig. 5 – Dimensions
Fig. 6 – Dimensions

7
CLEARANCES -- INDOOR
6 " (0.15m ) min.
5
"
(0.13m)
min.
6'
5 "
(0.13m)
min.
(1.8m)
CEILING
FLOOR
Fig. 7 – Indoor Unit Clearance
CLEARANCES -- OUTDOOR
A
DB
Air-outlet
Air-inlet
C
E
Fig. 8 – Outdoor Unit Clearance
UNIT Minimum Value
in. (mm)
A24 (609)
B24 (609)
C24 (609)
D4 (101)
E4 (101)
ELECTRICAL DATA
UNIT
SIZE OPERVOLTAGE- MAX / MIN*
COMPRESSOR OUTDOOR FAN INDOOR FAN MCA MAX FUSE
CB AMP
V/PH/HZ RLA LRA V/PH/HZ FLA HP WV/PH/HZ FLA HP W
9K
253 / 187 208-230/1/60
8.5 35
208-230/1/60
0.37 0.04 30
208-230/1/60
0.1 0.027 20 12 15
12K 9.5 40 0.37 0.04 30 0.1 0.027 20 13 20
18K 14.5 30 0.48 0.12 90 0.1 0.027 20 19 30
*Permissible limits of the voltage range at which the unit will operate satisfactorily
LEGEND
FLA --- F u l l L o a d A m p s
LRA --- L o c k e d R o t o r A m p s
MCA --- Minimum Circuit Amps
RLA --- R a t e d L o a d A m p s

8
WIRING
All wires must be sized per NEC (National Electrical Code) or
CEC (Canadian Electrical Code) and local codes. Use Electrical
Data table MCA (minimum circuit amps) and MOCP (maximum
over current protection) to correctly size the wires and the
disconnect fuse or breakers respectively.
Per caution note, only copper conductors with a minimum 300 volt
rating and 2/64--inch thick insulation must be used.
The use of BX cable is not recommended.
Recommended Connection Method for Power and
Communication Wiring -- Power and Communication Wiring:
The main power is supplied to the outdoor unit. The field supplied
14/3 power/communication wiring from the outdoor unit to indoor
unit consists of four (4) wires and provides the power for the
indoor unit. Two wires are high voltage AC power, one is
communication wiring and the other is a ground wire.
Recommended Connection Method for Power and
Communication Wiring (To minimize communication wiring
interference)
Power Wiring:
The main power is supplied to the outdoor unit. The field supplied
power wiring from the outdoor unit to indoor unit consists of three
(3) wires and provides the power for the indoor unit. Two wires are
high voltage AC power and one is a ground wire.
To minimize voltage drop, the factory recommended wire size is
14/2 stranded with a ground.
Communication Wiring:
A separate shielded copper conductor only, with a minimum 300
volt rating and 2/64--inch thick insulation, must be used as the
communication wire from the outdoor unit to the indoor unit.
Please use a separate shielded 16GA stranded control wire.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
SWires should be sized based on NEC and local codes.
SUse copper conductors only with a minimum 300 volt
rating and 2/64 inch thick insulation.
CAUTION
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
SBe sure to comply with local codes while running wire
from indoor unit to outdoor unit.
SEvery wire must be connected firmly. Loose wiring
may cause terminal to overheat or result in unit
malfunction. A fire hazard may also exist. Therefore, be
sure all wiring is tightly connected.
SNo wire should be allowed to touch refrigerant tubing,
compressor or any moving parts.
SDisconnecting means must be provided and shall be
located within sight and readily accessible from the air
conditioner.
SConnecting cable with conduit shall be routed through
hole in the conduit panel.
CONNECTION DIAGRAM
Fig. 9 – Connection Diagram

9
WIRING DIAGRAMS
Symbol Symbol Color Symbol Symbol Color Symbol Name
WH White GN Green CAP Jumper Cap
YE Yellow BN Brown COMP Compressor
RD Red BU Blue Grounding wire
YEGN Yellow/Green BK Black / /
VT Violet OG Orange / /
NOTE: Jumper cap is used to determine the fan speed and the swing angle of the horizontal louver of this model.
Indoor Unit
Fig. 10 – Indoor unit

10
Outdoor Unit
Fig. 11 – Sizes 09 -- 12

11
Fig. 12 – Size 18
NOTE: These wiring diagrams are subject to change without notice. Refer to the one supplies with the unit.
1Interface of neutral wire 5Interface of DC motor 9Interface of WIFI 13 Display interface
2Interface of live wire 6Up and Down swing 3 10 Interface of left
and right swing 14 Interface of
communication wire for
neutral wire and live wire
3Interface of fuse 7Tube temperature sensor 11 Up and down swing 2 / /
4Interface of jumper cap 8Ambient temperature
sensor 12 Up and down swing 1 / /
1Input of live wire
of power 4Input of ground wire of power 7Neutral wire of
electric heater of
compression 10 Interface of fan 13 U.V.W. Three
phases of
compressor
2Input of neutral
wire of power 5Live wire of electric heater 8Neutral wire of
electric heater of
chassis 11 Interface 1 of electric
reactor 14 Input of overload
3Communication
interface 6Neutral wire of 4-wire valve 9Live wire of 4-way valve 12 Interface 2 of electric reactor 15 Temp. sensor

12
REFRIGERATION SYSTEM DIAGRAM
TINUROODTUOTINUROODNI
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
GAS SIDE
3-WAY VALVE
LIQUID SIDE
2-WAY VALVE
COOLING
HEATING
Accumlator
Discharge
Suction
4-Way valve
Electron
Strainer Strainer
expansion
valve
Strainer Capillary
D
Strainer
Intercooler
Fig. 13 – Refrigeration System Diagrams
Connection pipe specification:
Liquid: ¼”
Gas: ½” (09K/12K)
Gas: ⅝” (18K)

13
REFRIGERANT LINES
General refrigerant line sizing:
1 The 619FB/538FR units are shipped with a full charge of
R410A refrigerant. All charges, line sizing, and capacities are
based on runs of 25 ft (7.6 m). For runs over 25 ft (7.6 m),
consult the long--line section on this page for proper charge
adjustments.
2 Minimum refrigerant line length between the indoor and
outdoor units is 10 ft. (3 m).
3 Refrigerant lines should not be buried in the ground. If it is
necessary to bury the lines, not more than 36--in (914 mm)
should be buried. Provide a minimum 6--in (152 mm) vertical
rise to the service valves to prevent refrigerant migration.
4 Both lines must be insulated. Use a minimum of 1/2--in.
(12.7 mm) thick insulation. A closed--cell insulation is
recommended in all long--line applications.
5 Special consideration should be given to isolating
interconnecting tubing from the building structure. Isolate the
tubing so that vibration or noise is not transmitted into the
structure.
IMPORTANT: Both refrigerant lines must be insulated separately.
SThe following maximum lengths are allowed:
System Size 9K
(208--230V)
12K
(208--230V)
18k
(208--230V)
Piping
Min. Piping Length ft (m) 10 (3) 10 (3) 10 (3)
Standard Piping
Length ft (m) 25 (7.6) 25 (7.6) 25 (7.6)
Max. outdoor--indoor
height difference ft (m) 32.8 (9.9) 32.8 (9.9) 32.8 (9.9)
Max. Piping Length
with no additional
refrigerant charge
ft (m) 25 (7.6) 25 (7.6) 25 (7.6)
Max. Piping Length ft (m) 82 (25) 82 (25) 82 (25)
Additional refrigerant
charge (between
Standard – Max
piping length)
Oz/ft
(g/m) 0.2 (18.6) 0.2 (18.6) 0.2 (18.6)
Gas Pipe (size --
connection type) in 1/2 Flare connection
1/2 Flare
connection
5/8 Flare
connection
Liquid Pipe (size --
connection type) in 1/4 Flare connection
1/4 Flare
connection
1/4 Flare
connection
Refrigerant
Refrigerant Type R410A R410A R410A
Charge Amount Lbs
(kg) 3.1 (1.4) 3.1 (1.4) 4.4 (2)
ADDITIONAL REFRIGERANT CHARGE TABLE
Unit Size Total Line Length ft. Additional Charge oz/ft. ft (m)
Min Max 10--25 (3--8) >25--82 (8--25)
9
10 82 None 0.0212
18
Long Line Applications Units:
1 No change in line sizing is required.
2 Add refrigerant per Additional Charge table.
SYSTEM EVACUATION AND
CHARGING
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system compressor as a vacuum pump.
CAUTION
!
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
System Vacuum and Charge
Using Vacuum Pump
1 Completely tighten flare nuts A, B, C, D, connect manifold
gage charge hose to a charge port of the low side service
valve (see Fig. 14).
2 Connect charge hose to vacuum pump.
3 Fully open the low side of manifold gage (see Fig. 15).
4 Start vacuum pump.
5 Evacuate using either deep vacuum or triple evacuation
method.
6 After evacuation is complete, fully close the low side of
manifold gage and stop operation of vacuum pump.
7 The factory charge contained in the outdoor unit is good for up
to 25 ft. (8 m) of line length. For refrigerant lines longer than
25 ft (8 m), add refrigerant as specified in the ADDITIONAL
REFRIGERANT CHARGE TABLE on this page.
8 Disconnect charge hose from charge connection of the low
side service valve.
9 Fully open service valves B and A.
10 Securely tighten caps of service valves.
Outdoor Unit Indoor Uni
t
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
Fig. 14 – Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
Fig. 15 – Manifold

14
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water (see Fig. 16).
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
Fig. 16 – Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation process should be used in accordance with
the following figure. Refer to Fig. 17 and proceed as follows:
1 Pump system down to 500 microns and allow pump to
continue operating for an additional 15 minutes.
2 Close service valves and shut off vacuum pump.
3 Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
4 Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5 Repeat this procedure as indicated in Fig. 17. The system is
freed of any contaminants and water vapor.
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
RELEASE CHARGE INTO SYSTEM
BREAK VACUUM WITH DRY NITROGEN
EVACUATE
WAIT
Fig. 17 – Triple Evacuation Method
Final Tubing Check
IMPORTANT: Ensure the factory tubing on both the indoor
and outdoor units has not shifted during shipment. Ensure
tubes are not rubbing against each other or any sheet metal.
Pay close attention to feeder tubes, making sure wire ties on the
feeder tubes are secure and tight.
CONTROL SYSTEM
The 619FB/538FR unit is equipped with a microprocessor control
to perform two functions:
1 Provide safety for the system
2 Control the system and provide optimum levels of comfort
and efficiency.
The main microprocessor is located on the control board of
outdoor unit. Outdoor and indoor units have thermistors used to
monitor the system operation to maintain the unit within acceptable
parameters and control the operating mode.
SYSTEM SAFETIES
3MinuteTimeDelay
To protect the compressor, there is a 3 minute delay on break even
if the control is calling for heating or cooling. The compressor has
an additional 1 minute delay when powering the unit on for the
first time, or after a power failure.
Compressor Top Temperature Protection
The unit stops working when the compressor top temperature
protector cuts off, and restarts after the compressor top temperature
protector restarts.
Compressor Discharge Temperature Protection
When the compressor discharge temperature reaches a higher one
than in normal operation, the running frequency is limited based on
the following algorithm:
-- When discharge B208_F, prohibit increasing frequency
-- When discharge B217_F, prohibit decreasing frequency
-- When discharge B230_F, compressor stop operation
-- When discharge B≤194_F, protection is released.
— If the compressor discharge temperature is lower than
194_F(90_C), there is no limit in the frequency.
— If this value is between 194_F and 221_F
(90<T5<105_C), the compressor continues running at
the current frequency.
— If this value is now between 221_F and 239_F
(105<T5<115_C), the frequency will decrease to a lower
level every 3 minutes.
— When the compressor discharge temperature reaches a
value higher than 239_F(115_C), and has been running
at this condition for 5 seconds, the compressor stops.
Fan Speed Protection
When indoor fan speed is below 300RPM for a specific amount of
time the unit stops and the LED displays the failure.
Inverter Module Protection
The Inverter module is protected for abnormalities in current,
voltage and temperature. If abnormal values of any of these take
place, the corresponding code appears in the indoor unit and the
unit stops.
Indoor Fan Delayed Operation
When the unit starts up, the louver will be active immediately and the
indoor fan will operate 10s later. If the operating mode is heating, the
indoor fan will also be controlled by the anti--cold blow function.

15
Compressor Preheating Function
The compressor crankcase heater activates if:
— The outdoor ambient temperature, T4, is lower than 37_F
(3_C) and power has been recently supplied to the machine.
—IfT4<37_F(3_C) and the compressor has not been
operating for over 3 hours.
During the preheating mode, a weak current flow flows through
the compressor coil from the wiring terminal of the compressor.
The compressor is heated when this is not operating.
The preheating function deactivates if T4 is greater than 41_F
(5_C) or the compressor starts operating.
Condenser temperature protection
The condenser temperature protection function acts as follows:
— If the condenser coil temperature (T3) is between 131_F
and 140_F (55C_<T3<60_C), the compressor frequency
decreases to a lower level until it reaches the lowest
value, F1. It then runs at the F1 frequency. Once
T3<129_F(54_C), the compressor continues running at
the current frequency.
— When the coil temperature reaches a value lower than
126_F(52_C), the compressor will not limit the
frequency and resumes to the required frequency.
— If T3>140_F(60_C) for 5 seconds, the compressor stops
and restarts once the coil temperature reaches a value
lower than 126_F(52_C).
Evaporator Temperature Protection
The evaporator temperature protection function acts as follows:
— If the evaporator coil temperature (T2) is lower than
32_F(0_C), the compressor stops and restarts once T2
≥41_F(5_C).
—If32_F≤T2 <39_F(0_C≤T2 <4_C), the compressor
frequency will be limited and decreased to a lower level.
—Now,if39_F≤T2 <45_F(4_C≤T2 <7_C), the
compressor continue running at the current frequency.
— If T2>45_F(7_C), the compressor frequency will not be
limited, and operation is normal.
SEQUENCE OF OPERATION
Interface
A wireless remote control, supplied with the unit, is the interface
between the fan coil and the user. The wireless remote control has
the following characteristics:
SCapable of displaying _Cand_F with _F being the default
setting. To change the default setting, refer to the Owner’s
Manual.
SThe remote control setpoint range is from 62_F(17_C) to
86_F(30_C) in increments of 1_F(1_C).
SThe wireless remote control has an operating range of 25 ft.
(7.62 m).
SThe same remote control can be used to control more than one
unit.
SIf the remote control is lost, damaged, or the batteries are
exhausted, the system can be operated by using the manual
button (forced Auto) located under the front panel.
Manual Button
AUTO/COOL
Fig. 18 – Manual Button Location on Unit
MODES OF OPERATION
COOLING MODE
In this mode, the system cools and dries the room air with the fan
running continuously, either at a selected fan speed or Auto fan
speed. The fan runs even when the compressor cycles off. This
feature enhances room comfort and efficiency of the system.
Compressor operation in cooling mode:
In cooling mode, the maximum operation frequency (Fmax) of the
compressor, after it starts running, depends on the outdoor ambient
temperature (T4).
Once the system starts running, the compressor runs at the Fmax
frequency for 7 minutes at a specific T4. During this time, the
frequency limitation is active, therefore the compressor continues
running even if the set point condition is satisfied. The compressor
running frequency will then be controlled based on the difference
between the room temperature and the temperature set point (T1--Ts).
Outdoor Fan Operation in Cooling Mode:
When in cooling mode, the outdoor fan motor cycles based on the
outdoor ambient temperature as shown below:
Fig. 19 – Cooling mode
Indoor Fan Operation in Cooling Mode:
When in cooling mode, the indoor fan runs continuously either at
the chosen set speed (high, medium, or low), or in Auto mode,
where the speed is determined by the microprocessor based on the
difference between the room temperature and the temperature set
point as shown below:
4
3
High
Low
1
Medium
1.5
Fig. 20 – Cooling mode

16
HEATING MODE
In this mode, the system heats the room air with the indoor fan
running at either the selected speed or on Auto. As in the cooling
mode, the indoor fan will run continuously unless interrupted by
the cold blow algorithm. This algorithm will not allow the fan to
run if the indoor coil temperature drops below a preset value.
Defrost is controlled by the on--board microprocessor.
Compressor operation in heating mode
In heating mode, the maximum operation frequency (Fmax) of the
compressor, after it starts running, depends on the outdoor ambient
temperature (T4).
Once the system starts running, the compressor will run at the
Fmax frequency for 7 minutes at a specific outdoor ambient
temperature (T4). During this time, the frequency limitation is
active, therefore the compressor will continue running even if the
set point condition is satisfied. The compressor running frequency
will then be controlled based on the difference between the room
temperature, the temperature set point, and a temperature
difference that takes a default value of 32_F ( T 1 -- T s -- ΔT).
Outdoor fan Operation in Heating Mode
When in heating mode, the outdoor fan motor cycles based on the
outdoor ambient temperature as shown below:
Fig. 21 – Heating mode
Indoor fan Operation in heating mode
In heating mode, the indoor fan runs depending on the evaporator
coil temperature (T2).
If the set point conditions are satisfied and the compressor stops,
the indoor fan will be forced to run for 127 seconds with breeze.
During this period, the anti--cold air is disabled.
If the machine is running at the rated capacity test mode, the indoor
fan will run at the rated speed and the anti--cold--wind function is
disabled.
Auto Mode in Heating Mode
In heating mode, When the fan speed is set to Auto, the fan will
run at a speed determined by the microprocessor based on the
difference between the room temperature and the temperature set
point as shown below:
2.5
2
High
Low
1
Medium
1.5
Fig. 22 – Heating mode
Defrost
Defrost on heat pump units is controlled by the microprocessor and
is initiated if either of the following conditions occur:
1 If for the outdoor temperature, T4>32_F󰇛0_C):
— The outdoor coil temperature (T3) has been lower than
37F(3) for about 40 minutes and during that period, the
coil temperature is lower than TCDI for more than 3
minutes.
— The outdoor coil temperature (T3) has been lower than
37F(3) for about 80 minutes and during that period,
the coil temperature is lower than (TCDI+2)formore
than3minutes.
2 If for the outdoor temperature, T4＜32_F󰇛0_C):
— If the conditions described above are satisfied, then the
program judges if the evaporator coil temperature (T2)
has decreased more than 41F(5). When the
evaporator coil temperature has decreased more than
41F(5), the defrost mode starts.
3 At any value of outdoor ambient temperature (T4):
— If the machine runs with a condenser coil temperature
lower than 37F(3) for more than 120 minutes and the
outdoor coil temperature (T3) has been lower than
(TCDI+4) for more than 3 minutes, the machine will
enter into defrost mode.
TCDI = --7_C = 19.4_F
Defrost cycle termination:
If any one of the following conditions is satisfied, the defrost cycle
will end and the system will return to normal operation:
1 The outdoor coil temperature (T3) reaches (TCDE1).
— For 9K--12K: TCDE1 = (64_F) 18_C
— For 18K--30K: TCDE1 = (59_F) 15_C
2 The outdoor coil temperature (T3) is kept at about 46F
(8) for at least 80 seconds.
3 The defrost cycle reaches 10 minutes.
The cycles of defrost algorithm are shown below:

17
For 9K, 12K models:
Compressor
on
off
on
on
on
off
off
off
4-way valve
Outdoor fan
Indoor fan
Indoor fan breeze(10s)
xx
10s
30s
10s
Defrost Cycle
(no longer than 10 min.)
xx=60s for 9k & 12k models
For 18K, 26K models:
Compressor
on
off
on
on
on
off
off
off
4-way valve
Outdoor fan
Indoor fan
Indoor fan breeze(10s)
xx
Defrost Cycle
(no longer than 10 min.)
30s
10s
10s
AUTO MODE
In the Auto mode, the temperature can be set to values between
62~86F (17~30). In this mode, the machine chooses either
Cooling, Heating or Fan--only mode according to ΔT.
NOTE:ΔT =T1--Ts, where T1 represents the indoor room
temperature and Ts represents the set temperature.
ΔT=T1--Ts Running mode
ΔT＞33FCooling
-- 1 < ΔT≤33FFan--only
ΔT≤-- 30FHeating
Indoor fan will run at an automatic fan speed for each running mode. The
louver will also operate depending in relevant mode taking place.
If the machine switches mode between heating and cooling, the
compressor stops for 15 minutes and then chooses a mode
according to ΔT.
If a new set temperature is commanded, the system chooses a
running mode according to ΔT.
FORCED OPERATION FUNCTION
When the machine is off, pressing the manual button carries the
machine to forced auto mode. Press the button once again, within
5 seconds, the machine turns to forced cooling mode. In forced
auto, forced cooling or any other operation mode, press the
manual button to turn the machine off. When in this mode, all
general protections and remote control functions are available.
Forced cooling mode:
The compressor runs at F2 frequency and indoor fan runs as
breeze. After running for 30 minutes, the machine turns to auto
mode with a 75_F(24_C) set temperature.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode
with a 75_F(24_C) set temperature.
TIMER FUNCTION
Timing range is 24 hours.
The timer function will not change the system’s current operation
mode. The setting time is relative time.
Timer on
The machine turns on automatically when reaching the set time.
Timer off
The machine turns off automatically when reaching the setting time.
Timer on/off
The machine turns on automatically when reaching the set “on” time,
and then turn off automatically when reaching the set “off” time.
SLEEP MODE FUNCTION
Operation time in sleep mode is 7 hours. After 7 hours the system
turns off. The Operation process in sleep mode is as follows:
When in cooling mode, the set temperature rises 1.8_F(1_C) (up
to a maximum 86_F(30_C)) every one hour. Two hours later the
set temperature stops rising and indoor fan is fixed at low speed.
Time (hour)12
2.0
° F(-16.7 °C )
2.0
° F(-16.7 ° C)
°
Set point
Fig. 23 – Sleep Mode -- Cooling
When in heating mode, the set temperature decreases 2.0_F
(--16.7_C)(down to a minimum 62_F(17_C)) every one hour. Two
hours later the set temperature stops rising and indoor fan is fixed at
low speed.
NOTE: Anti-cold wind function has the priority.
Time (hour)12
2.0
° F(-16.7 °C )
2.0
° F(-16.7 ° C)
°
Set point
Fig. 24 – Sleep Mode -- Heating
When the user uses timer off function in sleep mode (or sleep
function in timer off mode), if the timing is less than 7 hours, sleep
function will be cancelled when reaching the setting time. If the
timing is more than 7 hours, the machine will not stop until it
reaches the set time in sleep mode.

18
AUTO-RESTART FUNCTION
The indoor unit is equipped with auto-restart function, which is
carried out through an auto-restart module. In case of a sudden
power failure, the module memorizes the setting conditions present
previous to the power failure. The unit automatically resume to the
previous operation settings (not including swing function) 3
minutes after the power returns.
If the memorization condition is forced cooling mode, the unit runs
in cooling mode for 30 minutes and returns to auto mode at a 75_F
(24_C)set temp. If the equipment was off before the power went
off, and it is required to start up after this power failure, the
compressor will have a 1 minute delay when powering on. In other
conditions, the compressor will have a 3 minutes delay at re-start.
TROUBLESHOOTING
This section provides the required flow charts to troubleshoot
problems that may arise.
NOTE:Information required in the diagnoses can be found
either on the wiring diagrams or in the appendix.
Required Tools:
The following tools are needed when diagnosing the units:
SDigital multimeter
SScrew drivers (Phillips and straight head)
SNeedle--nose pliers
Recommended Steps
1 Refer to the diagnostic hierarchy charts below and
determine the problem at hand.
2 Go to the chart listed in the diagnostic hierarchy and follow
the steps in the chart for the selected problem.
For the ease of service, the systems are equipped with diagnostic
code display LED’s on both the indoor and outdoor units. The
outdoor diagnostic display is on the outdoor unit board and is
limited to very few errors. The indoor diagnostic display is a
combination of flashing LED’s on the display panel on the front
of the unit. If possible always check the diagnostic codes
displayed on the indoor unit first.
2.0
Problems may occur that are not covered by a diagnostic code, but
are covered by the diagnostic flow charts. These problems will be
typical air conditioning mechanical or electrical issues that can be
corrected using standard air conditioning repair techniques.
For problems requiring measurements at the control boards note
the following:
1 Always disconnect the main power.
2 When possible check the outdoor board first.
3 Start by removing the outdoor unit top cover.
4 Reconnect the main power.
5 Probe the outdoor board inputs and outputs with a digital
multi--meter referring to the wiring diagrams.
6 Connect the red probe to hot signal and the black probe to
the ground or negative.
7 Note that some of the DC voltage signals are pulse will give
continuously variable readings.
8 If it is necessary to check the indoor unit board you must
start by disconnecting the main power.
9 Next remove the front cover of the unit and then control
box cover.
10 Carefully remove the indoor board from the control box,
place it face up on a plastic surface (not metal).
11 Reconnect the main power and repeat steps 5,6, and 7.
12 Disconnect main power before reinstalling board to avoid
shock hazard and board damage.

19
No. Malfunction
Name
Display Method of Indoor Unit Display Method of Outdoor Unit
A/C Status Possible Causes
Dual-8
Code
Display
Indicator Display (during blinking,
ON 0.5s and OFF 0.5s)
Indicator has 3 kinds of display
status and during blinking, ON 0.5s
and OFF 0.5s
Operation
Indicator Cool Indicator Heating Indicator Yellow Indicator Red Indicator Green Indicator
1High pressure protection of
system E1
During cooling and drying
operation, indoor fan operates,
all modes stop operation.
During heating operation, the
unit stops.
Possible reasons:
1. Refrigerant was overcharged ;
2. Poor heat exchange (including
blockage of heat exchanger
3. Ambient temperature is too high
2Anti-freezing
protection E2 OFF 1S
and blink3
times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates.
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
3Refrigerant leakage
protection F0 OFF 1S
and blink
9times The Code Display displays F0
and the complete unit stops.
1. Refrigerant leakage;
2. Indoor evaporator temperature
sensor not working;
3. The unit has a restriction in the
piping.
4
High discharge
temperature
protection of
compressor E4 OFF 1S
and blink
7times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all modes stop.
Refer to the malfunction analysis
(discharge protection, overload).
5Overcurrent
protection E5 OFF 1S
and blink
5times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all modes stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and
load is too high;
3. Evaporator is dirty.
6Communication
Malfunction E6 Always
During cooling operation,
compressor stops while indoor
fan motor operates. During
heating operation, the
complete unit stops.
Refer to the corresponding
malfunction analysis.
7
High
temperature
resistant
protection E8 OFF 1S
and blink
6times
During cooling operation:
compressor stops while indoor
fan operates. During heating
operation, the complete unit
stops.
Refer to the malfunction analysis
(overload, high temperature
resistant).
8EEPROM
malfunction EE OFF 1S
and blink
11 times
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops
Replace outdoor control panel AP1
9
Limit / decrease
frequency due to
high temp. of
module EU All modes operate normally,
while operation frequency for
compressor is decreased
Discharging after the complete unit
is de-energized for 20mins, ensure
the thermal grease on IPM Module
of the outdoor control panel AP1 is
sufficient. If is no use, replace the
control panel AP1.
10 Malfunction protection of
jumper cap C5 Wireless remote receiver and
button are effective, but can
not dispose the related
command
1. No jumper cap insert on
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
11 Gathering
refrigerant Fo OFF 1S
and
blink17
times
When the outdoor unit
receives signal of gathering
refrigerant, the system is
forced to run under cooling
mode for gathering refrigerant
Nominal cooling mode
12
Indoor ambient
temperature
sensor is
open/short
circuited
F1
During cooling and drying
operation, indoor unit operates
while other modes stop; during
heating operation, the
complete unit stops operation.
1. Loosening or bad contact of
indoor ambient temp. sensor and
mainboard terminal.
2. Indoor ambient temp. sensor
damaged.(check with sensor
resistance value chart)
3. Mainboard damaged.
13
Indoor
evaporator
temperature
sensor is
open/short
circuited
F2
AC stops operation once
reaching the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other modes
stop operation; heating: AC
stop operation
1. Loosening or bad contact of
Indoor evaporator temp. sensor
and mainboard terminal.
2. Components on the mainboard
fail and lead to a short circuit..
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value chart for testing)
4. Mainboard damaged.
14
Outdoor ambient
temperature
sensor is
open/short
circuited
F3 OFF 1S and blink
6times
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,the
complete unit stops operation
Outdoor temperature sensor has
not been connected well or is
damaged. Check it by referring to
the resistance table for
temperature sensor)
15
Outdoor
condenser
temperature
sensor is
open/short
circuited
F4 OFF 1S
and blink
5times
During cooling and drying
operation, compressor stops
while indoor fan operates;
During heating operation, the
unit stops operation.
Outdoor temperature sensor has
not been connected well or is
damaged. check it by referring to
the resistance table for
temperature sensor)

20
No. Malfunction
Name
Dual-8
Code
Display
Operation
Indicator Cool Indicator Heating Indicator Yellow Indicator Red Indicator Green Indicator AC Status Possible Causes
16
Outdoor
discharge
temperature
sensor is
open/short
circuited
F5 OFF 1S and blink
7times
During cooling and drying
operation, compressor stops
after operating for about 3
mins, while indoor fan
operates. During heating
operation, the complete unit
stops after 3 mins.
1.Outdoor temperature sensor has
not been connected well or is
damaged. Check it by referring to
the resistance table for
temperature sensor)
2.The head of temperature sensor
has not been inserted into the
copper tube
17 Limit/ decrease frequency due to
overload F6 OFF 1S
and blink
3times
All loads operate normally,
while operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
18 Decrease
frequency due to
over-current F8 OFF 1S
and blink
once
All loads operate normally,
while operation frequency for
compressor is decreased The input supply voltage is too
low. System pressure is too high.
19
Decrease
frequency due to
high air
discharge F9 OFF 1S
and blink
twice
All modes operate normally,
while operation frequency for
compressor is decreased
Temperature is too high;
Malfunction of electric expansion
valve (EKV)
20 Limit/ decrease frequency due to
anti freezing FH OFF 1S
and blink
4times
All modes operate normally,
while operation frequency for
compressor is decreased Poor air-return in indoor unit or fan
speed is too low
21 Voltage for DC is
too high PH
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
unit stops operation.
1. Measure the voltage on
terminals L2 and S on terminal
block, if the voltage is higher than
265VAC, turn on the unit
2. If the AC input is normal,
measure the voltage of electrolytic
capacitor C on control panel (AP1)
if its normal, there is a malfunction
in the circuit, replace the control
panel (AP1)
22 Voltage of DC is
too low PL
During cooling and drying
operation, compressor will
stop while indoor fan will
operate; During heating
operation, the complete unit
will stop
1. Measure the voltage of position
L2 and S on terminal block, if the
voltage is higher than 150VAC,
turn on the unit.
2. If the AC input is normal,
measure the voltage of electrolytic
capacitor C on control panel
(AP1), if normal, there is a
malfunction on the circuit, replace
the control panel (AP1)
23 Compressor Min frequence in test
state P0 Showing during min. cooling or
min. heating test
24 Compressor rated frequence
in test state P1 Showing during nominal cooling or
nominal heating test
25
Compressor
maximum
frequence in test
state P2 Showing during middle cooling or
middle heating test
26
Compressor
intermediate
frequence in test
state P3 Showing during middle cooling or
middle heating test
27
Overcurrent
protection of
phase current for
compressor P5
During cooling and drying
operation, compressor stops
while indoor fan operates;
During heating operation, the
unit stops operation.
Refer to the malfunction analysis
(IPM protection, loss of
synchronism protection and over
current protection of phase current
for compressor.
28 Charging
malfunction of
capacitor PU
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops.
Refer to the part three—charging
malfunction analysis of capacitor
29
Malfunction of
module
temperature
sensor circuit P7
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops.
Replace outdoor control panel AP1
30 Module high temperature
protection P8
During cooling operation,
compressor will stop while
indoor fan will operate;
During heating operation, the
complete unit will stop
After the complete unit is de-
energized for 20mins, ensure the
thermal grease on IPM Module of
AP1 is sufficient. If not, replace
control panel AP1.
31
Decrease
frequency due to
high temperature
resistant during
heating
operation
H0 All modes operate normally, while operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
32 Static de-dusting
protection H2
33 Overload protection for
compressor H3 OFF 1S
and blink
8times
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops operation.
1. Wiring terminal OVC-COMP is
loosened. In normal state, the
resistance for this terminal should
be less than 1ohm.
2.Refer to the malfunction analysis
(discharge protection, overload)
34 System is
abnormal H4 OFF 1S
and blink
6times
During cooling and drying
operation, compressor stops
while indoor fan operates.
During heating operation, the
complete unit stops operation.
Refer to the malfunction analysis
(overload, high temperature
resistant)