Daikin THC02 Manual

Installation and Maintenance Manual IM 745-3
Group: Fan Coil
Part Number: 668708901
Date: October 2018
Ceiling Concealed Fan-Coil Unit
Models: THC02, THC03, THC04, THC06, THC08, THC10, THC12

IM 745-3 2 www.DaikinApplied.com
Safety Precautions
NOTICE
Installation and maintenance are to be performed only by qualied
personnel who are familiar with and in compliance with state, lo-
cal and national codes and regulations, and experienced with this
type of equipment.
WARNING
Moving machinery and electrical power hazards may cause se-
vere personal injury or death. Disconnect and lock off power be-
fore servicing equipment.
CAUTION
Sharp edges and coil surfaces are injury hazards. Avoid contact
with them.
Receiving
All units leaving the Daikin Applied plant are inspected for
quality prior to shipment.
Carefully inspect all shipments immediately upon delivery. Note
visible damage on the carrier’s freight bill and request that the
carrier send a representative to inspect the damage. This may
be completed by telephone or in person, but should always be
conrmed in writing.
The shipment should be unpacked in the presence of the agent so
that the extent of the damage or loss can be determined. The carri-
er’s agent will make an inspection report and a copy will be given to
the consignee for forwarding to the carrier with a formal claim.
Limited Warranty
Consult your local Daikin Representative for warranty details.
Refer to Form 933-43285Y. To nd your local Daikin Represen-
tative, go to www.DaikinApplied.com.
Contents
Safety Precautions ............................2
Receiving....................................2
Limited Warranty .............................2
Installation...................................3
Recommendations ...........................3
Air Duct Connection ..........................3
Chilled Water Pipe Connection ..................3
Installation...................................4
Drain Pipe Connection - Per Local Codes .........4
Suggested Condensate Trapping ................4
Interface Control Junction Box Wiring.............4
Wiring Diagrams ..............................5
Model C3H, 02–12EA, 208–230V, 60Hz...........5
Model C3H, 02–12JA, 277V, 60Hz ...............5
Model C3H, 02–12AA, 115V, 60Hz ...............6
Models THCH02, THCH03, THCH04 and THCH06
(Basic Unit Only) .............................6
Models THCH08, THCH10 and THCH12 (Basic Unit
Only) ......................................7
Control Wiring Schematics .....................7
Dimensional Data .............................8
Maintenance .................................9
General ....................................9
Monthly intervals .............................9
Troubleshooting .............................10
Problem, Cause and Solution ..................10
Failure Code Information......................11

www.DaikinApplied.com 3 IM 745-3
InstallatIon
Recommendations
NOTICE
Before installation and running the unit, please check the
following:
1. There must be enough space for the unit installation
and maintenance. Please refer to the unit outline and
dimensions in Figure 1 for the minimum distance
between the unit and obstacles.
2. Mount with the lowest moving parts at least 8 feet above
the oor or grade level.
3. Ensure enough space for piping connection and
electrical wiring.
4. Leave a means for disconnection from the electrical
supply according to NEC or local codes.
5. Check whether the hanging rods can support the weight
of the unit.
6. The unit must be installed horizontally for proper
operation and condensate draining.
7. The external static pressure must be within the
allowable static pressure range.
8. The installing contractor must supply service valves
and insulation for water piping in accordance with local
codes and regulations.
9. To prevent strain on the wire connections, use either
conduit or approved strain relief device.
10. Conrm that the power has been switched OFF before
installing or servicing the unit.
The unit is designed to be concealed in the ceiling. Installation
and maintenance should be performed by qualied personnel
who are familiar with local codes and regulations, and experi-
enced with this type of equipment.
There are holes on the top of the unit for hanging the unit above
the ceiling. Please refer to Figure 1 and Figure 2.
Note: Vibration isolators provided by others.
NOTICE
Make sure the top of the unit is level after installation.
The drain pan is designed with a little gradient to facilitate
drainage. Do Not Level Drain Pan!
Figure 1: Unit Clearances
Obstacle
Ceiling
BAC
A≥ 8 in.
B ≥ 16 in.
C ≥ 16 in.
Obstacle
Air Duct Connection
Air ducts should be made of galvanized steel and
connected to the ange of the unit with a canvas connector.
Refer to the unit dimensions. Insert the duct into the ange and
x with screws.
Duct connections must be installed in accordance with national
and local codes.
Figure 2: Air Duct Connection
Discharge Air Return Air
Ceiling
Ceiling Access Panel
with Air Return
Terminal
Block
A
Fan Coil
Unit
Flat
Washer
Hanging
Rod
Expansion
Screw
Nut
Detail A
Chilled Water Pipe Connection
Connect chilled water pipes to the unit. The water inlet is on
the bottom and water outlet is on top.
Figure 3: Pipe Connections
Water Inlet, Control
Valve Actuator
Water Outlet, Return Ball Valve
Air Flow
Supply Gate Valve

IM 745-3 4 www.DaikinApplied.com
Drain Pipe Connection - Per Local Codes
The drain pipe can be PVC or steel. Connect the drain pipe to the
unit. Pipe insulation is recommended to avoid condensation. The
suggested slope of the drain pipe is at least 1/8" per foot, but local
code will prevail. Refer to Figure 3 for typical piping installation.
Suggested Condensate Trapping
The condensate trap provides the water seal (water level in the
condensate trap) to prevent the ow of air from the condensate
drain line into the coil section during normal operation.
Improper trapping can lead to several problems. If the trap is
too tall, back pressure will prevent drainage, causing conden-
sate backup. If the trap is too short the seal will be destroyed
or nonexistent, producing the same effect as a non-trapped
system.
The trap should be constructed of 7/8" clear plastic piping. The
condensate piping from the drain trap must be sloped to facilitate
proper drainage. The clear plastic trap should be clamped and
removable for cleaning. It may be necessary to manually ll the
trap at system start-up, or to run the unit for sufcient time to build
a condensate seal. The condensate trap and condensate piping
drainage should be free of any foreign debris. Foreign debris can
prevent proper operation resulting in condensate buildup.
Figure 4: Suggested Condensate Trap
Condensate
Pan
7/8" I.D.
C
A
B
A B C
11/2" 3/4" 31/8"
Interface Control Junction Box Wiring
Wiring connection must be completed according to the wiring
diagram on the unit.
The unit must be GROUNDED. Installation of all eld wiring
must comply with NEC and local codes.
WARNING
A means for disconnect from electrical supply shall be
provided according to NEC or local codes. Conrm that the power
has been switched OFF before installing or servicing the unit.
Figure 5: Interface Control Junction Box (Left End Shown)
Interface Control
Junction Box
Figure 6: Interface Control Junction Box Detail
   
 

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
 






3
2
5
1
4
7
6
Table 1: Figure 6 Number Descriptions
Item Description
1 Control Module, MC722
2 Transformer, 24V
3 Terminal Block, HP
4 Terminal Block, HP
5 Middle Metal Sheet for Terminal Block Installation
6 Bush, ?43
7 Metal Sheet
InstallatIon

www.DaikinApplied.com 5 IM 745-3
WIrIng DIagrams
Model C3H, 02–12EA, 208–230V, 60Hz
!
Model C3H, 02–12JA, 277V, 60Hz
!

IM 745-3 6 www.DaikinApplied.com
Models THCH02, THCH03, THCH04 and
THCH06 (Basic Unit Only)
Figure 7: (115V / 1Ph / 60Hz), (208-230V / 1Ph / 60Hz)
L
G/Y: GREEN/YELLOW
FIELD WIRING
LF: FAN SPEED LOW
M: FAN MOTOR
MAIN SWITCH
NOTE:
POWER
SOURCE WHITE
G/Y
BLACK
MF: FAN SPEED MEDIUM
HF: FAN SPEED HIGH
SHF: FAN SPEED SUPER HIGH
G
G/Y
BLUE
N
L
H
FAN SPEED
SWITCH
M
ORANGE
M
G/Y
YELLOW
RED
SHF
HF
MF BROWN
LF
BLACK
BLACK
SOURCE
POWER
NOTE:
SHF: FAN SPEED SUPER HIGH
HF: FAN SPEED HIGH
MF: FAN SPEED MEDIUM
G/Y: GREEN/YELLOW
LF: FAN SPEED LOW
M: FAN MOTOR
FIELD WIRING
MAIN SWITCH
G/Y
BLACK
WHITE BLUE
N
L
FAN SPEED
SWITCH
H
RED
SHF
YELLOW
HF
M
L
BROWN
MF
ORANGE
LF
G/Y
BLACK
M
BLACK
Figure 8: (220V / 1Ph / 50Hz)
L
G/Y: GREEN/YELLOW
FIELD WIRING
LF: FAN SPEED LOW
M: FAN MOTOR
MAIN SWITCH
NOTE:
POWER
SOURCE WHITE
G/Y
BLACK
MF: FAN SPEED MEDIUM
HF: FAN SPEED HIGH
SHF: FAN SPEED SUPER HIGH
G
G/Y
BLUE
N
L
H
FAN SPEED
SWITCH
M
ORANGE
M
G/Y
YELLOW
RED
SHF
HF
MF BROWN
LF
BLACK
BLACK
SOURCE
POWER
NOTE:
SHF: FAN SPEED SUPER HIGH
HF: FAN SPEED HIGH
MF: FAN SPEED MEDIUM
G/Y: GREEN/YELLOW
LF: FAN SPEED LOW
M: FAN MOTOR
FIELD WIRING
MAIN SWITCH
G/Y
BLACK
WHITE BLUE
N
L
FAN SPEED
SWITCH
H
RED
SHF
YELLOW
HF
M
L
BROWN
MF
ORANGE
LF
G/Y
BLACK
M
BLACK
WIrIng DIagrams
Model C3H, 02–12AA, 115V, 60Hz
!

www.DaikinApplied.com 7 IM 745-3
Models THCH08, THCH10 and THCH12
(Basic Unit Only)
Figure 9: (115V / 1Ph / 60Hz), (208-230V / 1Ph / 60Hz)
HYELLOW
SHF: FAN SPEED SUPER HIGH
BLACK
YELLOW
LF: FAN SPEED LOW
M1,M2: FAN MOTOR
FIELD WIRING
NOTE:
HF: FAN SPEED HIGH
MF: FAN SPEED MEDIUM
G/Y
RED G/Y
BLUE
RED
L
SOURCE
POWER N
FAN SPEED
SWITCH
SHF
HF
ORANGE
BROWN M2
BLACK
G/Y
BLACK
ORANGE
BROWN
L
MMF
LF
M1
BLACK
MAIN SWITCH G
G/Y
WHITE
BLACK
G/Y: GREEN/YELLOW
BLACK
G/Y: GREEN/YELLOW
FIELD WIRING
M1,M2: FAN MOTOR
LF: FAN SPEED LOW
NOTE:
POWER
SOURCE
MAIN SWITCH
BLACK
WHITE
MF: FAN SPEED MEDIUM
HF: FAN SPEED HIGH
SHF: FAN SPEED SUPER HIGH
M2
G/Y
RED
BLUE
N
YELLOW
BROWN
G/Y
BLACK
SWITCH
FAN SPEED
H
M
LLF
G/Y
L
RED
SHF
ORANGE
MF
YELLOW
HF
BROWN M1
BLACK
ORANGE BLACK
Figure 10: (220V / 1Ph / 50Hz)
HYELLOW
SHF: FAN SPEED SUPER HIGH
BLACK
YELLOW
LF: FAN SPEED LOW
M1,M2: FAN MOTOR
FIELD WIRING
NOTE:
HF: FAN SPEED HIGH
MF: FAN SPEED MEDIUM
G/Y
RED G/Y
BLUE
RED
L
SOURCE
POWER N
FAN SPEED
SWITCH
SHF
HF
ORANGE
BROWN M2
BLACK
G/Y
BLACK
ORANGE
BROWN
L
MMF
LF
M1
BLACK
MAIN SWITCH G
G/Y
WHITE
BLACK
G/Y: GREEN/YELLOW
BLACK
G/Y: GREEN/YELLOW
FIELD WIRING
M1,M2: FAN MOTOR
LF: FAN SPEED LOW
NOTE:
POWER
SOURCE
MAIN SWITCH
BLACK
WHITE
MF: FAN SPEED MEDIUM
HF: FAN SPEED HIGH
SHF: FAN SPEED SUPER HIGH
M2
G/Y
RED
BLUE
N
YELLOW
BROWN
G/Y
BLACK
SWITCH
FAN SPEED
H
M
LLF
G/Y
L
RED
SHF
ORANGE
MF
YELLOW
HF
BROWN M1
BLACK
ORANGE BLACK
WIrIng DIagrams
Control Wiring Schematics
Figure 11: Heating/Cooling 2-Pipe With Automatic Changeover
WHT
16
CLG
BLU
HTG
RED
BLK
RED
WHT
WHT
TCI
ORG
C/O V
HTG
CLG
TCI
V
C/O
Wire No.
Wire Color
Wire Connector
Wire Connector
Field Connector
Cooling
Heating
Thermostat
Valve
Change over Switch
(Manual or Auto)
BLK
Legend
Figure 12: Heating/Cooling 4-Pipe With Sequencing Thermostat
CLG
BLU
HTG
RED
BLK
BLK
HTG
CLG
WHT
WHT
WHT
TCI
ORG
V
V
WHT
16
HTG
CLG
TCI
V
C/O
Wire No.
Wire Color
Wire Connector
Wire Connector
Field Connector
Cooling
Heating
Thermostat
Valve
Change over Switch
(Manual or Auto)
Legend

IM 745-3 8 www.DaikinApplied.com
DImensIonal Data
Figure 13: THC Horizontal Concealed, with Extended Drain Pan and
Plenum Filter Box
Terminal Block
(Basic Unit Only)
4.53"
1.25"
9.53"
Chilled Water
Connections 3/4" FPT
9.88"
1.25"
5.82"
9.25"
23.25"
1.25"
4.72"
9.53"
Plenum Back with Filter
Filter Rail
Water Return
Connection
3/4" FPT
Air Vent
Filter
E
D
4 - Mounting Holes
3/8" x 5/8"
TOP VIEW
8.125"
2- R/A Plenum
Mounting Holes
3/8" x 5/8"
F
2" Auxiliary Overflow
Drain 3/8" I.D.
Auxiliary Overflow
Drain 3/8" I.D.
Basic terminal box
located at the same
side as the coil
connection
Unit with plenums,
filter removable
from either side or
bottom of unit
Terminal box located
at the same side as
coil connection
Main
Condensate
Drain 3/4" O.D.
1/2"
1.25"
23.25"
9.25"
9.88"
1.73"
2.75"
3.46"
2.32"
7.36"
6.38"
A
9.75"
B
1.5"
C
1.02"
5.75" 9.75"
1.40"
12.75"
8.75"
2"
6.54"
7.73"
.88"
FRONT VIEW
Main
Condensate
Drain 3/4" O.D.
Terminal Block
Water Supply
Connection
3/4" FPT
Hot Water
Connection
3/4" FPT Main Drain
Connection
3/4" O.D.
8.82"
(Unit w/o Plenum)
18.35"
(Unit w/o Plenum)
(Optional) LV-3SP Jbox
7.73"H x 6.54"W x 3.38"D
(always located on the end
opposite the coil connection)
8.94"
(Unit w/o Plenum)
Detail
(Optional) LV-3SP Jbox -
Interface Control Junction Box
7.73"
6.54"
4.66"
.877"
3.75"
3.13"
1Metal Sheet
2 Terminal Block - Line Voltage
3 Terminal Block - Line Voltage
4 Relay, 24v coil - Line Voltage Contact
5 Terminal Block - Low Voltage
6 Terminal Block, 24v - Line Voltage
7 Transformer, 24v - Line Voltage
8 Divider
4-Pipe System - Right Hand Unit* 2-Pipe System - Right Hand Unit*
*Factory supplied left hand units also available
Unit Size A B C D E F Number of
Fans
Filters
Size Qty
H02 32.05" 17.64" 19.17" 19.96" 18.46" 21.13" 1 181/8" x 8” x 1" 1
H03 38.74" 24.33" 25.87" 26.65" 25.15" 27.82" 1 247/8" x 8” x 1" 1
H04 43.86" 29.45" 30.98" 31.77" 30.20" 32.94" 2 297/8" x 8” x 1" 1
H06 51.73" 37.32" 38.86" 39.65" 38.07" 40.82" 2 187/8" x 8” x 1" 2
H08 61.57" 47.17" 48.70" 49.49" 47.91" 50.66" 3 233/4" x 8” x 1" 2
H10 65.51" 51.10" 52.64" 53.43" 51.85" 54.60" 3 253/4" x 8” x 1" 2
H12 75.75" 61.34" 62.87" 63.66" 62.09" 64.83" 4 307/8" x 8” x 1" 2
Note: All dimensions ± 0.10”

maIntenanCe
General
A good general maintenance plan will avoid performance loss
and unexpected shut-down of the equipment.
A dirty lter reduces air ow as well as unit performance.
Changing or cleaning the lter is very important. Check the
lter monthly and replace or clean as required.
Coils should be cleaned of dust, dirt and lint with compressed air
or water. They can be vacuumed or brushed with a soft brush.
CAUTION
Water coils exposed to freezing temperatures should be drained or
anti-freeze should be added to the water circuit to avoid freezing.
Monthly intervals
1. Inspect and clean the condensate drain pan to help avoid
clogging of drainage by dirt, dust, etc. Inspect drainage
piping for proper condensate ow.
2. Check and clean the coil. Clean the coil with a low pressure
water jet or low pressure air.
3. Clean and tighten all the wiring connections.
www.DaikinApplied.com 9 IM 745-3

troubleshootIng
Problem, Cause and Solution
If the unit does not work properly, rst check the points reported in the table below before requesting service.
If the problem cannot be solved, contact your dealer or service center.
Problem Description Possible Cause Recommended Solution
The unit does not operate.
Power failure or the unit power is not on. Wait until the power is on or turn on the unit
power.
The power plug is loose. Plug in the power plug properly
The motor is damaged. Replace the motor.
Abnormal noise and
vibration occur during unit
operation.
The motor bearing is damaged Replace the motor.
Screws for xing the fan and motor are loose. Fix the screws securely.
The fan volute is deformed and collides with the
fan impeller, or the impeller is deformed. Replace the fan.
Sundries exist in the ventilation outlet or the duct. Remove the sundries.
The air lter is blocked. Replace the new air lter
The air supply is not
smooth or the air ow
volume is small.
The return air inlet or air outlet of unit is blocked. Remove the obstacle.
The air lter is blocked. Replace the new air lter.
The cooling or heating
function fails.
The electric control valve of unit is not started. Start the electric control valve of unit.
The circulating pump is not started. As a result,
the cold or hot water does not ow. Start the circulating pump.
The heat exchanger ns are blocked or pushed
down. Clean and repair the heat exchanger.
Temperature of the cold water during cooling is
too high, or temperature of the hot water during
heating is too low.
Adjust the congured temperature of the unit.
The set temperature of temperature controller is
inappropriate.
Adjusted the set temperature of the temperature
controller.
The air lter is blocked. Replace the new air lter.
Water leaks.
The condensate drain pan is blocked. Clean the condensate drain pan.
The unit is not installed horizontally. Adjust the place of the unit until it is placed
horizontally.
Cold water is being provided continuously when
the fan has already stopped.
Stop the electric control valve of unit or operate
the unit at a low gear.
Ambient temperature too high.
Perform dehumidication and avoid the entering
of high-temperature and high-humidity air into
indoor places.
The discharge valve is loose. Tighten the discharge valve.
The unit piping leaks. Contact the seller.
IM 745-3 10 www.DaikinApplied.com

troubleshootIng
Failure Code Information
When the motor is failure-free standby, the LED indicator light of the driver will be on for 1 second, off for 1 second, and ickering
following the cycle;
When the motor runs normally, the LED indicator light of the driver will be always on;
If there is failure, the indicator light will be on for 0.3 second, off for 0.3 second, ickering for N times and off for 3 seconds, then
ickering following the cycle. Failure code and elimination method are as shown in the following table:
Flicker Times (N) of the
Driver Indicator Light Failure Description Suggested Elimination Method
1 Motor overcurrent protection Check whether there is open circuit or short
circuit on the motor lead
3 Over-voltage protection of driver DC bus Check the power supply voltage value
4 Under-voltage protection of driver DC bus Check the power supply voltage value
5 Motor stall protection Check whether the motor or drought fan is loos-
ened or the air outlet is blocked
6/8 Motor stalling/boot failure protection Check whether the drought fan got stuck by
foreign matter
7 Motor open-phase protection
Check whether the motor or drought fan is poor
repair stitching, or whether there is short circuit
or open circuit on the motor lead
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IM 745-3 ©2018 Daikin Applied (10/18) | (800) 432–1342 | www.DaikinApplied.com
Daikin Applied Training and Development
Now that you have made an investment in modern, efcient Daikin equipment, its care should be a high
priority. For training information on all Daikin HVAC products, please visit us at www.DaikinApplied.com
and click on Training, or call 540-248-9646 and ask for the Training Department.
Warranty
All Daikin equipment is sold pursuant to its standard terms and conditions of sale, including Limited
Product Warranty. Consult your local Daikin Applied representative for warranty details. Refer to Form
933-430285Y. To nd your local Daikin Applied representative, go to www.DaikinApplied.com.
Aftermarket Services
To nd your local parts ofce, visit www.DaikinApplied.com or call 800-37PARTS (800-377-2787).
To nd your local service ofce, visit www.DaikinApplied.com or call 800-432-1342.
This document contains the most current product information as of this printing. For the most up-to-date
product information, please go to www.DaikinApplied.com.
Products manufactured in an ISO Certied Facility.