Carrier 40MFC User manual

Service Manual
40MFC / 38MFC
40MFQ / 38MFQ
High---Wall Ductless Split System
Sizes 009 to 022
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 1...................................
MODEL / SERIAL NUMBER NOMENCLATURE 2.........
STANDARD FEATURES AND ACCESSORIES 3...........
SPECIFICATIONS -- COOLING ONLY (MFC) 4............
SPECIFICATIONS -- HEAT PUMP UNITS (MFQ) 5.........
DIMENSIONS 6......................................
SERVICE VALVE LOCATIONS 6........................
CLEARANCES 7.....................................
SYSTEM OPERATING ENVELOPE 8....................
ELECTRICAL DATA 8................................
WIRING 9...........................................
CONNECTION DIAGRAMS 9..........................
WIRING DIAGRAMS 10...............................
REFRIGERATION CYCLE DIAGRAM 14.................
REFRIGERANT LINES 15.............................
SYSTEM EVACUATION AND CHARGING 15.............
CONTROL SYSTEM 16...............................
SYSTEM SAFETIES 17...............................
SEQUENCE OF OPERATION 17........................
MODES OF OPERATION 18............................
TROUBLESHOOTING 20..............................
APPENDIX 32.......................................
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
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 38--40MF family of Puron air conditioners
and 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
OUTDOOR UNIT
38 MFC 1
--- --- ---
009
38 = A ir --- C o o l e d C o n d e n s e r
Unit Type
MFC --- C o o l in g O n l y
MFQ --- H e a t P u m p
Voltage
1--- 1 1 5 --- 1 --- 6 0
3--- 2 0 8 --- 2 3 0 --- 1 --- 6 0
INDOOR UNIT
40 MFC 1
--- --- ---
009
40= Fan Coil Unit
Unit Type
MFC --- C o o l in g O n l y
MFQ --- H e a t P u m p
Voltage
1--- 1 1 5 --- 1 --- 6 0
3--- 2 0 8 --- 2 3 0 --- 1 --- 6 0
Nominal Capacity
009 --- 3 / 4 To n
012 --- 1 To n
017 --- 1 --- 3 / 7 To n ( H P )
018 --- 1 --- 1 / 2 To n ( A C )
022 --- 1 --- 5 / 6 To n s
Nominal Capacity
009 --- 3 / 4 To n
012 --- 1 To n
017 --- 1 --- 3 / 7 To n ( H P )
018 --- 1 --- 1 / 2 To n ( A C )
022 --- 1 --- 5 / 6 To n s
01 06
Week of Manufacture
Year of Manufacture
00001
Serial Number
V
Manufacturing Site
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
Wired Remote Control A
Wireless Remote Control 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 Mode S
Silence Mode S
Auto Changeover On Heat Pumps S
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
Legend
SStandard
A Accessory
INDOOR UNITS
A07892
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.
NOTE: An external 115v power source will be required to run the
pump on unit sizes 9k and 12k.
OUTDOOR UNITS
Crankcase Heater
Standard on all unit sizes. Heater clamps around compressor oil
stump.

4
SPECIFICATIONS -- COOLING ONLY UNITS (MFC SERIES)
System
Size (KBTU/Hr) 09 12 18 22
Outdoor Model 38MFC009---1 38MFC012---1 38MFC012---3 38MFC018---3 38MFC022---3
Indoor Model 40MFC009---1 40MFC012---1 40MFC012---3 40MFC018---3 40MFC022---3
AHRI Performance Ratings*
Cooling Rated Capacity Btu/h 9,000 12,000 18,000 22,000
Cooling Cap. Range Min - Max Btu/h 4,000-10,000 4,500-13,000 5,500-19,000 6,500-24,000
SEER 15
EER 10 98.5 10
Operating Range
Cooling Outdoor DB Min - Max °F 14 - 115
Cooling Indoor DB Min -Max °F 63 - 90
Controls
Wireless (°C, °F, Convertible) Standard - Convertible
Wired (°C, °F, Convertible) Optional: KSACN0101CAC
Electrical
System Voltage-PH-Hz 115 -1 -60 208-230-1-60
Control Voltage 0-15V DC
Power Supply Indoor unit powered from outdoor unit
Outdoor - MCA 19 19 10 14 16
Outdoor - Fuse Rating (MOCP) 30 30 15 20 25
Outdoor Motor
Rpm/CFM 1000 / 945 940 / 945 860 / 1050 930 / 1390
Diameter (in) ... No. of Blades 15.8 … 3 16.7 … 3 18.3 … 3
Motor (hp) 0.31 0.33 0.68 0.72
Capacitor (µF) / voltage 6 / 250V 2.5 / 400 - 450v 2.5 / 450v
Indoor Motor
Motor Watts/ HP 15 / 0.02 15 / 0.02 20 / 0.027 28 / 0.038 45 / 0.061
Rpm/CFM (High) 1200 / 192 1200 / 230 1200 / 232 1200 / 348 1200 / 547
Rpm/CFM (Medium) 1050 / 160 1050 / 194 1050 / 193 1050 / 294 1050 / 458
Rpm/CFM (Low) 900 / 131 900 / 158 900 / 157 900 / 236 900 / 368
Blower Diameter / Length (in) 3.7 / 21.3 3.9 / 28.7 4.2 / 30.7
Capacitor (µF) 31.5 3
Refrigerant
Refrigerant Type R410A
Design Pressure (PSIG) 550
Metering Device Capillary Tube in Outdoor Unit
Charge (lb) 1.34 1.43 1.87 2.60
Refrigerant Lines
Connection Type Flare
Pipe Connection Size - Liquid (In) OD 1/4 3/8
Pipe Connection Size - Suction (In) OD 3/8 1/2 5/8
Condensate Drain OD / ID (in) 0.65 / 0.63
Maximum Piping Length (ft) 65 98
Max Lift (Fan Coil Above) (ft) 25 30
Max Drop (Fan Coil Below) (ft) 25 30
Compressor
Type Rotary
Model DA108X1C-20FZ3 DA130M1C-31FZ DA150S1C-20FZ
Oil Charge (POE –oz (g)) 16.9 (480) 17.6 (500)
Capacitor 45µF / 250VAC 6µF / 450VAC None
Rated Current (RLA) 5.3 3.95 9.7
Locked Rotor Amp (LRA) 10 14 17
Outdoor Coil
Face Area (sq. ft.) 4.10 6.10 7.67 11.16
No. Rows 11.5 2
Fins per inch 21
Circuits 2 4
Indoor Coil
Face Area (sq. ft.) 2.53 2.98 1.61 5.29
No. Rows 1/2 2
Fins per inch 20 21
Circuits 2 4 5
Dimensions - Outdoor
Dimensions(WXHXD)In 35.8 x 23 x 13.2 34.9 x 25.4 x 14 38.0 x 29.7 x 15.6
NetWeight(lbs.) 58.4 61.7 76.0 98.1
Dimensions - Indoor
Dimensions(WXHXD)In 26.8 x 10.0 x 7.0 30.3 x 10.0 x 7.4 35.6 x 10.8 x 7.8 40.6 x 12.4 x 8.6
NetWeight(lbs.) 15.4 16.5 19.8 26.4
*Air Conditioning, Heating & Refrigeration Institute
--- Ratings are net values reflecting the effects of circulating fan heat. Ratings are
based on: Cooling Standard: 80_F (26.67_C) db, 67_F (19.44_C) wb air
entering indoor unit and 95_F(35_C) db air entering outdoor unit. High
Temperature Heating Standard: 70_F (21.11_C) db air entering indoor unit and
47_F (8.33_C) db, 43_F (6.11_C) wb air entering outdoor unit.
--- Ratings are based on 25 ft. (7.62 m) of interconnecting refrigerant lines.
--- All system ratings are based on fan coil units operating at high fan speed.
Consult Specification tables for airflows at all available fan speeds.
Legend
SEER --- Seasonal Energy Efficiency Ratio
EER --- Energy Efficiency Ratio
MCA --- Minimum Circuit Amps
MOCP --- M a x . O v e r --- C u r r e n t P r o t e c t i o n

5
SPECIFICATIONS -- HEAT PUMP UNITS (MFQ SERIES)
System
Size (KBTU/Hr) 09 12 17 22
Outdoor Model 38MFQ009---1 38MFQ012---1 38MFQ012---3 38MFQ017---3 38MFQ022---3
Indoor Model 40MFQ009---1 40MFQ012---1 40MFQ012---3 40MFQ017---3 40MFQ022---3
AHRI Performance Ratings*
Cooling Rated Capacity Btu/h 9,000 12,000 17,000 22,000
Cooling Cap. Range Min - Max Btu/h 4,000-10,000 4,500-13,000 5,500-19,000 6,500-24,000
SEER 15
EER 10.5 10 99.5
Heating Rated Capacity Btu/h 9,000 12,000 18,000 22,000
Heating Cap. Range Min - Max Btu/h 4,000-10,500 4,500-13,000 5,500-19,500 6,500-24,500
HSPF 8.2
COP Btuh, W 8.1 8.0 9.7
Operating Range
Cooling Outdoor DB Min - Max °F 14 - 115
Heating Outdoor DB Min - Max °F 5-75
Cooling Indoor DB Min - Max °F 63 - 90
Heating Indoor DB Min - Max °F 32 - 86
Controls
Wireless (°C, °F, Convertible) Standard - Convertible
Wired (°C, °F, Convertible) Optional: KSACN0101CAC
Electrical
System Voltage-PH-Hz 115 -1 -60 208-230-1-60
Control Voltage 0-15V DC
Power Supply Indoor unit powered from outdoor unit
Outdoor - MCA 19 10 14 16
Outdoor - Fuse Rating (MOCP) 30 15 20 25
Outdoor Motor
Rpm/CFM 1000 / 945 940 / 945 860 / 1050 930 / 1390
Diameter (in) ... No. of Blades 15.8 … 3 16.7 … 3 18.3 … 3
Motor (hp) 0.31 0.33 0.68 0.72
Capacitor (µF) 62.5
Indoor Motor
Motor Watts/ HP 15 / 0.02 15 / 0.02 20 / 0.027 28 / 0.038 45 / 0.061
Rpm/CFM (High) 1200 / 192 1200 / 230 1200 / 232 1200 / 348 1200 / 547
Rpm/CFM (Medium) 1050 / 160 1050 / 194 1050 / 193 1050 / 294 1050 / 458
Rpm/CFM (Low) 900 / 131 900 / 158 900 / 157 900 / 236 900 / 368
Blower Diameter / Length (in) 3.7 / 21.3 3.9 / 28.7 4.2 / 30.7
Capacitor (µF) 31.5 3
Refrigerant
Refrigerant Type R410A
Design Pressure (PSIG) 550
Metering Device Capillary Tube in Outdoor Unit
Charge (lb) 2.6 2.87 3.52
Refrigerant Lines
Connection Type Flare
Pipe Connection Size - Liquid (In) OD 1/4 3/8
Pipe Connection Size - Suction (In) OD 3/8 1/2 5/8
Condensate Drain OD / ID (in) 0.65 / 0.63
Maximum Piping Length (ft) 65 98
Max Lift (Fan Coil Above) (ft) 25 30
Max Drop (Fan Coil Below) (ft) 25 30
Compressor
Type Rotary
Model DA108X1C-20FZ3 DA130M1C-31FZ DA150S1C-20FZ
Oil Charge (POE –oz (g)) 16.9 (480) 17.6 (500)
Capacitor 45µF / 250VAC 6µF / 450VAC None
Rated Load Amps (RLA) 5.3 3.95 9.7
Locked Rotor Amp (LRA) 10 14 17
Outdoor Coil
Face Area (sq. ft.) 8.19 7.81 11
No. Rows 2
Fins per inch 17 18
Circuits 3 4
Indoor Coil
Face Area (sq. ft.) 2.53 2.98 1.61 5.29
No. Rows 1/2 2
Fins per inch 20 21
Circuits 2 4 5
Dimensions - Outdoor
Dimensions(WXHXD)In 35.8 x 23 x 13.2 34.9 x 25.4 x 14 38.0 x 29.7 x 15.6
NetWeight(lbs.) 70.5 82.7 103.6
Dimensions - Indoor
Dimensions(WXHXD)In 26.8 x 10.0 x 7.0 30.3 x 10.0 x 7.4 35.6 x 10.8 x 7.8 40.6 x 12.4 x 8.6
NetWeight(lbs.) 15.4 16.5 19.8 26.4
*Air Conditioning, Heating & Refrigeration Institute
--- Ratings are net values reflecting the effects of circulating fan heat. Ratings are
based on: Cooling Standard: 80_F (26.67_C) db, 67_F (19.44_C) wb air
entering indoor unit and 95_F(35_C) db air entering outdoor unit. High
Temperature Heating Standard: 70_F (21.11_C) db air entering indoor unit and
47_F (8.33_C) db, 43_F (6.11_C) wb air entering outdoor unit.
--- Ratings are based on 25 ft. (7.62 m) of interconnecting refrigerant lines.
--- All system ratings are based on fan coil units operating at high fan speed.
Consult Specification tables for airflows at all available fan speeds.
Legend
SEER --- Seasonal Energy Efficiency Ratio
EER --- Energy Efficiency Ratio
HSPF --- Heating Seasonal Performance Factor
COP --- Coefficient of Performance
MCA --- Minimum Circuit Amps
MOCP --- M a x . O v e r --- C u r r e n t P r o t e c t i o n

6
DIMENSIONS -- INDOOR
A14343
Unit Size W in (mm) D in (mm) H in (mm) Operating Weight lb (kg)
9K 26.8 (680) 7.0 (178) 10.0 (255) 15.4 (7)
12K 30.3 (770) 7.4 (188) 10.0 (255) 16.5 (7.5)
17K HP / 18K AC 35.6 (905) 7.8 (198) 10.8 (275) 19.8 (9)
22K 40.6 (1030) 8.6 (218) 12.4 (315) 26.4 (12)
DIMENSIONS -- OUTDOOR
L2
L1
D
A14344
Model W in (mm) D in (mm) H in (mm) L1 in (mm) L2 in (mm) Operating
Weight lb (kg)
9K/12K 30.7 (780) 9.8 (250) 21.2 (540) 21.6 (549) 10.9 (276) 70.5 (32.0)
17K HP / 18K AC 29.9 (760) 11.2 (285) 23.2 (590) 20.9 (530) 11.4 (290) 82.7 (37.5)
22K 33.3 (845) 12.6 (320) 27.6 (700) 22.1 (560) 13.2 (335) 103.6 (47.0)
SERVICE VALVE LOCATIONS
J
K
9/12K 17/18K 22K
J
K
JK
A14408
Service Valve Locations 9K
in. (mm)
12K
in. (mm)
18K
in. (mm)
22K
in. (mm)
J4.37 (111) 4.37 (111) 4.09 (104) 4.13 (105)
K4.61 (117) 4.61 (117) 6.34 (161) 4.13 (105)

7
CLEARANCES -- INDOOR
6 " (0.15m ) min.
5
"
(0.13m)
min.
6'
5 "
(0.13m)
min.
(1.8m)
CEILING
FLOOR
A07891
Fig. 2 – Indoor Unit Clearance
CLEARANCES -- OUTDOOR
A
DB
Air-outlet
Air-inlet
C
E
A07894
UNIT Minimum Value
in. (mm)
A24 (610)
B24 (610)
C80 (2032)
D12 (305)
E24 (610)
Fig. 3 – Outdoor Unit Clearance

8
SYSTEM OPERATING ENVELOPE
5°F 75°F
32°F
86°F
14°F 115 °F
63 °F
90°F
-23-18-13-8 -3 2 7 12172227323742475257
-1
4
9
14
19
24
29
34
39
44
49
30
40
50
60
70
80
90
100
110
120
-10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140
Outdoor Temperature (°C)
Indoor Temperature (°C)
Indoor Temperature (°F)
Outdoor Temperature (°F)
Heang Connuous
Operaon
Cooling Connuous
Operaon
NOTE: If the system operates beyond the conditions presented in this envelope, certain safety protection features may operate
and cause the system to operate abnormally. Optimum performance will be achieved during this operating temperature envelope.
A14466
Fig. 4 – System Operating Envelope
ELECTRICAL DATA
UNIT SIZE
OPER.
VOLTAGE
MAX / MIN*
COMPRESSOR OUTDOOR FAN INDOOR FAN
MCA MAX FUSE
CB AMP
V --- P H --- H Z RLA LRA V --- P H --- H Z FLA HP WV --- P H --- H Z FLA HP W
9K 127 / 104 115--- 1 --- 6 0 5.3 10 1 1 5 --- 1 --- 6 0 0.7 0.31 23 1 1 5 --- 1 --- 6 0 0.3 0.020 15 19 30
12K
12K
253 / 187 2 0 8 --- 2 3 0 --- 1 --- 6 0
5.3 10
2 0 8 --- 2 3 0 --- 1 --- 6 0
0.3 0.33 24
2 0 8 --- 2 3 0 --- 1 --- 6 0
0.2 0.027 20 10 15
017K (HP)
018K (AC) 3.95 14 0.6 0.68 50 0.3 0.038 28 14 20
22K 9.7 17 0.6 0.72 53 0.4 0.061 45 16 25
*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

9
WIRING
Recommended Connection Method for Power and Communi-
cation Wiring (To minimize communication wiring interfer-
ence)
Power Wiring:
The main power is supplied to the outdoor unit. The field supplied
connecting cable 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.
Consult your local building codes and the NEC (National
Electrical Code) or CEC (Canadian Electrical Code) for special
requirements.
All wires must be sized per NEC or CEC 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.
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.
To minimize voltage drop of the control wire, use the following
wire size and maximum lengths shown in the chart below:
Wire Size Length
ft (m)
18 AWG 50 (15)
16 AWG 50 (15) to 100 (30)
Alternate Connection Method for Power and Communication
Wiring (May not prevent communication wiring interference)
The main power is supplied to the outdoor unit. The field supplied
connecting cable from the outdoor unit to indoor unit consists of
four (4) wires and provides the power and communication signals
for the indoor unit. Two conductors are for power wiring (L1/L2,
or L/N), one is a ground wire, and one is a DC communication
wire.
Consult your local building codes and the NEC (National
Electrical Code) or CEC (Canadian Electrical Code) for special
requirements. All power wires must be sized per NEC or CEC 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.
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.
The main power is supplied to the outdoor unit. the field supplied
connecting cable from the outdoor unit to indoor unit consists of
four wires and provides the power for the indoor unit as well as the
communication signal between the outdoor unit and indoor unit.
Two wires are high voltage AC power (L1 and L2), one is a
ground wire, and one is a DC communication wire.
CONNECTION DIAGRAMS
S
LN
115-1-60
Main
Power Supply
115-1-60
1(L) 2(N)
SLN
Power to
Indoor Unit
CONNECTING CABLE
OUTDOOR TO INDOOR
GND
Indoor Unit
Power Supply
Ground
Indoor
Signal
High
Voltage
115-1-60
115-1-60
FIELD POWER SUPPLY
GND
Indoor
Signal
High
Voltage
208-230-1-60
9K and 12k 115v INDOOR UNIT 9K and 12k 115v OUTDOOR UNIT
S
L1 L2
Main
Power Supply
208-230-1-30
L1 L2
SL1 L2
Power to
Indoor Unit
CONNECTING CABLE
OUTDOOR TO INDOOR
GND
Indoor Unit
Power Supply
Ground
Indoor
Signal
High
Voltage
115-1-60
FIELD POWER SUPPLY
GND
Indoor
Signal
High
Voltage
12K to 22K 208-230V OUTDOOR UNIT12K to 22K 208-230V INDOOR UNIT
208-230-1-30
Notes:
1. Do not use thermostat wire for any connection between indoor and outdoor units.
2. All connections between indoor and outdoor units must be as shown. The connections are sensitive to polarity and will result in a fault code.
A14506
Fig. 5 – Connection Diagrams

10
WIRING DIAGRAMS
INDOOR WIRING DIAGRAM
M
CN5
YELLOW
RED
DISPLAY BO ARD
5
C N10 A
CN11
CN8
CN9
P_1
8
CN16
L_IN
LNS
U
V
W
BLUE
U
V
W
4
CN28
CN26
CN10(CN19)
N-B
CN15
CN16
L2
N-A
Y/G
RED
BLUE
BLACK
5
CN34
CN33
CN6
CN7
CN5
CN4
L N S
BROWN
BLUE
YELLOW
Y/G
Y/G
N
L
N
BLACK
BLACK
L-A(CN37)
L-B(CN36)
RED
RED
REACTOR
RY3
GND
CN8 CN9
HEATER, CRANKCASE
T
RED
BLACK
CS
Y/G
Power Input
GND
2020375A5475
2020325B3267
Dashed frame parts only for heat pump model.
M
~
3(2) 3
64
FANC APACIT
ORBOARD
FAN C APACIT
OR BOARD
Optional
CN 2
CODE PART NAME
L_IN FireWire L input terminal CN11 Zero line N input terminal CN16 Internal and external communication line interface CN6 Indoor fan interface CN4 Fan feedback interface CN5 Stepper motor interface P_1 Ground interface CN8 Room temperature sensor interface CN9 Pipe temperature sensorinterface CN10A Display interface CN1 Electronic expansion valve interface CN14 Compressor top temperature sensor (optional) CN15 Exhaust temperature sensor CN16 Outdoor temperature & amp; condenserpipe temperature sensor CN10 DC fan output port (no) CN19 AC fan output port CN33 Electric heating wire line N CN34 Electric heating wire line L CN26,CN28 Four way valve control port CN4 Power L input terminal CN5 Power N input terminal CN6 Ground wire CN7 Communication line CN8,CN9 Reactor connected line port CN36,CN37 PFC capacitor connected line port N- B Power L input terminal CN17 Test p an el inte rfac e U V W Compressor connection port
OUTDOOR WIRING DIAGRAM
Fig. 6 – Wiring Diagram 38/40MFC/MFQ009 / 38/40MFC/MFQ012 (115V)

11
WIRING DIAGRAMS (CONT.)
CN10
B
CN3
CN2
CN15
CN16
5
WHITE WHITE
BLACK
BLACK
BLACK
BLACK
20 20 37 5A54 77
CN28
CN26
CN34
CN33 RED
BLACK
BLUE
4
L2
N-A
RY3
CS
U
V
W
U
V
W
Y/G
RED
BLUE
BLACK
CN6
CN7
CN5
CN4
L N S
BROWN
BLUE
YELLOW
Y/G
Y/G
L
N
GND
Y/G
Power Input
INDOOR WIRING DIAGRAM
M
CN5
YELLOW
RED
DISPLAY BO ARD
5
CN10A
CN11
CN8
CN9
P_1
8
CN16
L_IN
L1 L2 S
GND
HEATER, CRANKCASET
2020328A7163
Dashed frame parts only for heat pump model.
M
~
3(2) 3Optional
CN2
CODE PART NAME
L_IN FireWire L input terminal CN11 Zero line N input terminal CN16 Internal and external communication line interface CN6 Indoor fan interface CN4 Fan feedback interface CN5 Stepper motor interface P_1 Ground interface CN8 Room temperature sensor interface CN9 Pipe temperature sensor interface CN10A Display interface CN14 Compressortop temperature sensor(optional) CN15 Exhaust temperature sensor CN16 Outdoortemperature & condenserpipe temperature sensor CN26,CN28 Four way valve c ontrol port CN10 AC fan output port CN32,CN34 Electric heating wire line N CN31,CN33 Elec tric heating wire line L CN4 Power L input terminal CN5 Power N input terminal CN6 Ground wire CN7 Commun ic atio n lin e N- B Power L input terminal CN2,CN3 Reactor connected line port CN17 Test panel interface U V W Compressor connection port
OUTDOOR WIRING DIAGRAM
Fig. 7 – Wiring Diagram 38/40MFC/MFQ012 (208--230V)

12
WIRING DIAGRAMS (CONT.)
OUTDOOR FAN
DISCHARGE SENSOR
HEAT EXCHANGER SENSOR (BLACK)
AMBIENT SENSOR (WHITE)
CN 102
CN 103
CN10(CN10A)
5(3)
U
V
W
U
V
W
Y/G
RED
BLUE
BLACK
BLACK
BLACK
REACTOR
CN22 CN11
L N S
BROWN
BLUE
YELLOW
Y/G
Y/G
L
N
GND
Y/G
Power Input
CN 9
RED
BLACK
CN 14
CN 15
CN 12
CN 13
CN 4
CN 7
L2
CS
INDOOR WIRING DIAGRAM
M
CN5
YELLOW
RED
DISPLAY BO ARD
5
CN10A
CN11
CN8
CN9
P_1
8
CN16
L_IN
L1 L2 S
GND
HEATER, CRANKCASE T
2020378A3515
2020328A7163
Dashed frame parts only for heat pump model.
M
~
3(2) 3
Optional
CN2
CN 8
CODE PART NAME
L_IN FireWire L input terminal CN11 Zero line N input terminal CN16 Internal and external communication line interface CN6 Indoor fan interface CN4 Fan feedback interface CN5 Stepper motor interface P_1 Ground interface CN8 Room temperature sensor interface CN9 Pipe temperature sensorinterface CN10A Displa y interfac e CN101 Compressor top temperature sensor (optional) CN102 Exhaust temperature sensor CN103 Outdoortemperature & condenserpipe temperature sensor CN8,CN9 Four way valve control port CN10 AC fan output port CN4 Electric heating wire line N CN7 Electric heating wire line L CN13 Power L input terminal CN12 Power N input terminal CN14 Ground wire CN15 Commun ic atio n line N- B Power L input terminal CN11,CN22 Reactor connected line port U V W Compressor connection port
OUTDOOR WIRING DIAGRAM
Fig. 8 – Wiring Diagram 38/40MFC018 -- 38/40MFQ017 (208--230V)

13
WIRING DIAGRAMS (CONT.)
INDOOR WIRING DIAGRAM
M
CN5
YELLOW
RED
DISPLAY B OARD
5
CN2
C N10 A
CN11
CN8
CN9
P_1
8
CN16
L_IN
L1 L2 S
GND
BLACK
RED
L-OUT
HEATER, C RANKCASE
20 20 37 9A41 84
RED BLUE
CN30
S
YELLOW
Y/G
YELLOW
YELLOW
L N S
Y/G
L
N
GND
Y/G
Power Input
CS
2020328A7163
Dashed frame parts only for heat pump model.
M
~
3(2) 3
Optional
CODE PART NAME
L_IN FireWire L input terminal CN11 Zero line Ninput terminal CN16 Internal and external communication line interface CN6 Indoor fan interface CN4 Fan feedback interface CN5 Stepper motor interface P_1 Ground interface CN8 Room temperature sensor interface CN9 Pipe temperature sensor interface CN10A Disp lay inte rfac e CN12 Compressor top temperature sensor(optional) CN7 Exhaust temperature sensor CN17 Outdoortemperature & condenserpipe temperature sensor CN1,CN2 Fou r wa y valve c ontrol p ort CN11,CN22 AC fan output port CN10,CN13 Fan c apacitor port CN5 Elec tric heating wire line N CN6 Elec tric heating wire line L CN3 Power L input terminal CN4 Power N input terminal P1 Ground wire CN15 Communication line N- OUT1 Power N Onput terminal RY2 POWER Power L Onput terminal CN26 Test panel interface CN4 Power L input terminal CN5 Power N input terminal CN2 CN3 Reactor connected line port CN11 Bus voltage positive terminal CN12 Bus voltage positive terminal CN1 Main control board and power supply CN6 Standby power interface U V W Compressor connec tion port
OUTDOOR WIRING DIAGRAM
Fig. 9 – Wiring Diagram 38/40MFC(Q)022 (208--230V)

14
REFRIGERATION CYCLE DIAGRAMS
CAPILLARY TUBE
HEAT
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(EVAPORATOR)
FIELD
PIPING
COMPRESSOR
FLARE CONNECTION
SERVICE VALVE
SERVICE VALVE W/GAUGE PORT
TWO PHASE LIQUID LINE
SUCTION LINE
FIELD
PIPING
FLARE CONNECTION
A08104
Fig. 10 – Cooling
CAPILLARY TUBE
HEAT
EXCHANGER
(CONDENSER)
HEAT
EXCHANGER
(EVAPORATOR)
SERVICE VALVE
LIQUID HTG LIQUID
TWO PHASE
CHECK VALVE
(HEATING MODEL ONLY)
REVERSING
VALVE
(HEAT PUMP ONLY)
COOLING
HEATING
COMPRESSOR
SUCTION
DISCHARGE
SUCTION
ACCUMULATOR
SERVICE VALVE
W/ GAUGE PORT
FIELD
PIPING
INDOOR UNIT OUTDOOR UNIT
FLARE CONNECTION
FLARE CONNECTION
A08105
Fig. 11 – Heat Pumps

15
REFRIGERANT LINES
General refrigerant line sizing:
1 The 38MFC/MFQ 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 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. 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:
REFRIGERANT LINE LENGTHS ft. (m)
Unit Size Max Line Length Max Elevation
(ID over OD)
Max Elevation
(OD over ID)
9K 65 (20) 25 (8) 25 (8)
12K 65 (20) 25 (8) 25 (8)
17K HP 65 (20) 30 (10) 30 (10)
18K AC 65 (20) 30 (10) 30 (10)
22K 98 (30) 30 (10) 30 (10)
SThe following are the piping sizes.
PIPE SIZES (in)
Unit Size Mix Phase Vapor
9K 1/4 3/8
12K 1/4 1/2
17K HP 1/4 1/2
18K AC 1/4 1/2
22K 3/8 5/8
Refrigerant Charge
REFRIGERANT CHARGE lb. (kg)
Unit Size Air Conditioner (AC) Heat Pump (HP)
9K 1.34 (0.61) 2.60 (1.18)
12K 1.43 (0.65) 2.60 (1.18)
17K HP NA 2.87 (1.30)
18K AC 1.87 (0.85) NA
22K 2.60 (1.18) 3.52 (1.60)
SAbove charge is for piping runs up to 25 ft. (7.6 m).
SFor piping runs greater than 25 ft. (7.6 m), add
refrigerant up to the allowable length as specified
below:
ADDITIONAL REFRIGERANT CHARGE
Unit Size oz./ft. (g/m)
9K --- 18K 0.16 (15)
22K 0.32 (30)
SCapillary tubes in outdoor unit are used as metering
devices.
Long Line Applications, 38MFC Units:
1 No change in line sizing is required.
2 Add refrigerant per table below.
ADDITIONAL CHARGE TABLE
Unit
Size
To t al L i n e
Length ft
Additional Charge, oz/ft.
ft (m)
Min Max 10 --- 25
( 3 --- 8 )
> 2 5 --- 6 5
( 8 --- 2 0 )
> 6 5 --- 9 8
( 2 0 --- 3 0 )
9K
10 65 None 0.16
12K
18K AC
17K HP
22K 98 0.32 0.32
3 Reduction in capacity due to long lines can be calculated
from the chart below.
CAPACITY LOSS
Capacity,% Loss
Line Length ft (m)
Cooling: 25 (7.5) 33 (10) 49 (15) 65 (20) 98(30)
9&12K 1% 2% 5% 7% ---
18&22K 1% 2% 4% 6% 8%
Heating:
9&12K 1% 2% 7% 11% ---
17&22K 1% 2% 6% 10% 15%
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. 12.)
2 Connect charge hose to vacuum pump.
3 Fully open the low side of manifold gage. (See Fig. 13)
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 ADDI-
TIONAL REFRIGERANT CHARGE table in this document.
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.

16
Outdoor Unit Indoor Uni
t
Refrigerant
Service Valve
Low Side
High Side
A
B
C
D
A07360
Fig. 12 – Service Valve
Manifold Gage
500 microns
Low side valve
High side valve
Charge hose
Charge hose
Vacuum pump
Low side valve
A07361
Fig. 13 – Manifold
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. 14)
500
MINUTES
01234567
1000
1500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
2000
MICRONS
2500
3000
3500
4000
4500
5000
A95424
Fig. 14 – Deep Vacuum Graph
Triple Evacuation Method
The triple evacuation method should only be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water.
Refer to Fig. 15 and proceed as follows:
1 Pump system down to 28 in. of mercury 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. Dur-
ing this time, dry nitrogen will be able to diffuse throughout
the system absorbing moisture.
5 Repeat this procedure as indicated in Fig. 15. System will
then be free 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
A95425
Fig. 15 – Triple Evacuation Method
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both
indoor and outdoor unit 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 feeder tubes are secure and tight.
CONTROL SYSTEM
The 40MFC/MFQ 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.

17
SYSTEM SAFETIES
3MinuteTimeDelay
In order to protect the compressor, there is a 3 minute delay on
break even if the control is calling for heating or cooling. The
compressor will have 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 will stop working when the compressor top temperature
protector cuts off, and will restart 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 will be limited
based on the algorithm presented below:
— 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 will continue 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 the indoor fan speed has been too low (300RPM) for certain
time, the unit will stop and the LED will display 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 will be displayed in the indoor unit
and the unit will stop.
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.
Compressor Preheating Function
The compressor crankcase heater will activate 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 will deactivate If T4 is greater than 41_F
(5_C) or the compressor starts operating.
Zero Crossing Detection Error Protection
If the a detected zero crossing time interval is not correct for a
continuous 240 seconds, the unit will stop and the LED will
display the failure. The correct zero crossing signal time interval
should be between 6 to 13 minutes.
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
will decrease to a lower level until it reaches the lowest
value, F1. It then runs at this F1 frequency. Once
T3<129_F(54_C), the compressor will continue 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 will
stop and restart 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 will stop 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
A14359
Fig. 16 – Manual Button Location on Unit

18
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 will run at the
Fmax frequency for 7 minutes at a specific 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 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:
22
20
High
Low
A14470
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
A14471
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 0_C ( 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:
17
15
Low
High
A14475
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--wind 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
A14477

19
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.
Where: 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 17K--22K: 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:
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
A14478
For 17K, 22K models:
XX=60 for 17k model, XX=90 for 22k model
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
A14479
AUTO MODE
In the Auto mode, the temperature can be set to values between
62~86F (17~30℃). In this mode, the machine will choose cool-
ing, 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＞1℃Cooling
-- 1 < ΔT≤1℃Fan--only
ΔT≤-- 1 ℃Heating
Indoor fan will run at an automatic fan speed for each running mode.
The louver will also operate depending in relevantmode taking place.
If the machine switches mode between heating and cooling, the
compressor will stop for 15 minutes and then choose a mode ac-
cording to ΔT.
If a new set temperature is commanded, the system will choose a
running mode according to ΔT.
FORCED OPERATION FUNCTION
When the machine is off, pressing the manual button will carry the
machine to forced auto mode. Pressing the button once again,
within 5 seconds, the machine will turn into forced cooling mode.
In forced auto, forced cooling or any other operation mode,
pressing the manual button will turn off the machine.
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 will turn to auto mode
with a 75_F(24℃) 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.

20
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 will turn on automatically when reaching the set time.
Timer off
The machine will turn off automatically when reaching the setting
time.
Timer on/off
The machine will turn 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.
Operation process in sleep mode is as follow:
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.
Set point
Time (hour)12
1.8°F (1°C)
1.8°F (1°C)
A08108
Fig. 17 – Sleep Mode -- Cooling
When in heating mode, the set temperature decreases 1.8_F(1_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
Set point
Time (hour)12
1.8°F (1°C)
1.8°F (1°C)
A08110
Fig. 18 – 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.
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 will 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 will
runincoolingmodefor30minutesandturntoautomodeata
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.
The diagnostic codes for the indoor and outdoor units are listed in
appendix A8 and A9.
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 please
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.