Cooper & Hunter V Series User manual

Applicable Models (VSeries):
CH-HRV3.5K
CH-HRV5K
CH-HRV8K
CH-HRV10K
CH-HRV15M
CH-HRV20M
Energy Recovery Ventilation
System
Commercial Air Conditioners
Owner's Manual
Thank you for choosing commercial air conditioners.
Please read this Owner’s Manual carefully before operation and retain it for
future reference.
If you have lost the Owner's Manual, please contact the local agent or visit www.
cooperandhunter.com.

Contents
1. Preface ........................................................................................................... 1
2. Introduction to Product ................................................................................... 1
2.1 Main Features ............................................................................................ 1
2.2 Features of Structure.................................................................................. 2
3. Control............................................................................................................ 3
3.1 Operation Instructions ................................................................................ 3
4. Outline Dimensions ........................................................................................ 8
5. Installation Instructions................................................................................... 9
5.1 General....................................................................................................... 9
5.2 Engineering Design .................................................................................... 9
5.3 Installation Diagram.................................................................................. 11
6. On-site Construction..................................................................................... 12
6.1 Installation of the Controller...................................................................... 12
6.2 Fabrication of the Duct ............................................................................ 12
7. On-site Construction Requirements ............................................................. 14
8. Electric Wiring.............................................................................................. 15
8.1 Wiring Installation ..................................................................................... 16
8.2 Grounding................................................................................................. 16
8.3 Trial Run and Routine Maintenance ......................................................... 17
8.4 Troubleshooting........................................................................................ 18
9. Safety Precautions ....................................................................................... 18
10. Technical Datasheet ................................................................................... 20

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1. Preface
This product complies with the national standard GB/T 21087-2007.
Modern civilization has brought more and more adverse effects to our living environment. With
more and more wider application of the air conditioning and kinds of synthetic building materials,
popularization of modern ofce equipment, enhancement of air tightness of the building, reduction
of fresh air volume for energy saving and cost cutting, harmful gases and biologic pollutants inside
the building cannot be diluted or discharged properly. Recently, healthy, energy-saving, simple and
reliable fresh air system and equipment have become the focus for the HVAC engineers and users.
Cooper&Hunter is a perfect solution for problems stated above for its dual-direction ventilation, that
is, it can bring fresh air inside and meanwhile discharge polluted air outside. During ventilation, the
high-efciency heat-recovery equipment can keep the indoor temperature unchangeable.
Besides, the equipped air lter can effectively lter air going inside. In short, new technologies and
new materials make this new product of low energy consumption, excellent performance, now
noise and simple installation etc.
2. Introduction to Product
2.1 Main Features
(1) Dual-ventilation
It can bring fresh air inside and deliver polluted air outside, which makes the users always feel
natural comfort.
(2) Energy Recovery
During ventilation, imported air and exported air will make heat exchanger, and 70% of heat will
be recovered.
(3) Low Noise
The specialized low-noise fan is used.
(4) Air Filtering
The internal air lter can guarantee the imported air clean and dustless.
(5) Large lineup
The large lineup can satisfy various

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2.2 Features of Structure
ERV mainly consists of the main unit and the control.
◆Main Unit
The main unit mainly consists of the centrifugal fan and the heat exchanger. Air before going
inside the heat exchanger will pass through the lter, where dust particles and bers will be sorted
out. The internal air lter can be taken out from the access door. At the joint between the outer
casing and the access door, there is long-lasting sealing material, which can make the whole
cabinet airtight. The hot galvanized steel outer casing and insulation sponge attached to the
external surface can absorb noise produced by the fan and also prevent dewing in summer.
Figure 1 Main Structure of CH-HRV Series

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3. Control
3.1 Operation Instructions
Caution!
◆Do not install the control at the humid area.
◆Do not beat, toss or frequently turn on/off this control.
Figure 2 Front Panel of the Control
1 Timing set point 10 Mode key
2 Energy saving status 11 Humidity increasing key
3 Humidity set point 12 Humidity decreasing key
4 Environment temperature 13 Fan speed key
5Air mode status (fresh air, discharge air,
supply air) 14 Switching key
6 Fan speed status (hi/medium/low) 15 Timing key
7Mode status (Auto, Bypass, Heat
exchange) 16 On/Off key
8 Error status 17 Reset key
9 Filter cleaning status 18 Child lock icon
Note: for CH-HRV15 and CH-HRV20, there is no discharge air and supply air modes for the
item number 5 and fan speed is uncontrolled for the item number 6.

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3.1.1 On/Off
Figure 3
◆By pressing the On/Off key, it is able to start/stop the control.
◆Under the “Off” status, pressing the “Mode” key for 5 seconds can activate the memory
function upon power failure, In this case, when 01 is displayed at the temperature set point
area, it indicates the memory function has been activated. When 02 is displayed, the memory
function has been deactivated. Then, by pressing the ‘On/Off” key, this setting can exit. At
the setting page, if there is not any operation during 20 seconds, the control will back to the
normal “Off” status. The memory function is defaulted to be deactivated.
3.1.2 Control to the Fan Speed
Figure 4 Figure 5
◆As shown in the gure 4, under the fresh air mode, by pressing the “Fan” key, the fan speed
will change circularly from low speed to medium speed to high speed, which however is
unavailable for CH-HRV15 and CH-HRV20.
◆As shown in the gure 5, under discharge or supply air modes, by pressing the “Fan” key, the
fan speed will switch between low and high speed, which is also unavailable for CH-HRV15
and CH-HRV20.

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3.1.3 Control to Humidity
Figure 6
◆For the unit with humidifying function, pressing the “▲” key will increase the humidity set
point; while pressing the “▼” key will decrease the humidity set point. Each press will make
the set point change by 5%.
◆When pressing the “▲” and “▼” keys at the same time for ve seconds, “EE” and a lock icon
will be displayed. In this case, all key operation will be deactivated. Then, by pressing the “▲”
and “▼” keys at the same time for ve seconds again, the lock function will be deactivated.
◆When the control is deactivated by remote monitoring or central control, “CC” will be
displayed and all key operation and remote signals are invalid.
◆The humidity range is 30%-70% (RH).
3.1.4 Switch/Reset
Figure 7
◆When it is required to clean the unit, the beeper will raise an alarm for 30s. In this case, by
pressing the “Reset” key for five seconds, the runtime for cleaning will become zero, the
beeper will stop and the cleaning symbol will disappear.
◆When the unit is turned on, by pressing the “Timer” key and then quickly pressing the “Switch”
key, it will switch to timer for stopping the unit, timer for activating energy saving, timer for
deactivating energy saving, and timer for cleaning circularly.

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3.1.5 Run Mode
Figure 8
◆By pressing the “Mode” key, the run mode will change circularly from automatic to bypass to
heat exchange.
◆Under the automatic mode, “AUTO” will light on and the system will operates base on indoor
and outdoor temperatures as well as the temperature difference.
◆Under the bypass mode, “BYPASS” will light on. When the damper is opened, the fan will
work based on the air mode and fan speed settings. This mode is generally applicable to
transitional seasons and will extend the service life of the heat exchanging core.
◆Under the heat exchange mode, “HEAT EXCHANGE” will light on. When the damper is
closed, the fan will work based on the air mode and fan speed settings. In this mode, it can
realize all heat exchange for fresh air, saving more energy and being much healthier.
3.1.6 Timer
Figure 9
◆When the unit is off, by pressing the “Timer” key, the unit can be timed on. When the unit
is on, by pressing the “Timer” key, the unit can be timed off and energy saving function
and cleaning function can be timed on separately. Under the setting status, “TIMER”, “HR”
and the setting value will blink. At this point, by pressing the “▲” /“▼” key, the setting value
will increase or decrease by 0.5 hours at a time. Then, by pressing the “Timer” key, this
setting will become valid. When the timer works, by pressing the “Timer” key again, it will be

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canceled.
◆The setting rang for timing the unit on/off is 0.5~24 hours.
◆The setting range for timing the energy saving function on is 2~5 hours. The default setting is
2 hours.
◆The setting range for timing the energy saving function off is 1~4 hours. The default setting
is 1 hour. Only when this timing expires, energy saving function can be timed on by pressing
“Fan” and “▼” at the same time for ve seconds.
◆The setting range for timing the cleaning function on/off is 1250 hours, 2500 hours and a
variable to be determined. The default setting is 1250 hours.
◆Only when the timer works, the setting value will decrease with time.
3.1.7 Environment Humidity
◆Generally, it indicates the indoor environment humidity.
Note: for the unit with humidifying function, the humidity will be displayed only when this
function is activated.
3.1.8 Humidifying On/Off
◆By pressing the “Mode” and “▼” key at the same time for five seconds, the humidifying
function will be switched to be on or off alternatively.
◆For the unit with the humidifying function, only it has been activated, both the indoor humidity
and humidity set point will be displayed. This function is defaulted to be off. In the dry
seasons, it is suggested to activate this function.
3.1.9 Air Mode
◆By pressing the “Mode” and “▲” keys at the same time for five seconds, fresh air mode,
discharge air mode and supply air mode can be switched circularly. See gure 2 for more
details. The air mode is decided by the user. When positive pressure is required indoor,
supply air mode is satisfactory. When negative pressure is required, discharge air mode is
favorable. In generally, fresh air mode is satisfactory.
3.1.10 Energy Saving
◆By pressing the “Fan” and “▲” keys at the same time for ve seconds, the energy saving
function can be switched on or off alternatively. When this function has been activated, “SAVE”
will be displayed. When the unit is not required to run for long time, this function can not only
provide fresh air but also guarantee the indoor air quality.
3.1.11 Error Display
♦When some error occurs, “ERROR” and error codes will be displayed.
Error Codes Error Description
E6 Communication error
F0 Indoor temperature sensor error
L1 Humidity sensor error
F3 Outdoor temperature error
L0 Damper error

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3.1.12 Intelligent Start/Stop
◆It is also called the central control for dampers, which are used for multiple rooms but are
under the control the one unit. It can totally control eight dampers. A patching board is
required.
3.1.13 Address Setting
Figure 9
◆When the unit is off, by pressing the “Mode” and “▲” keys at the same time for ve seconds,
it is able to set the address of the control (1~16). At this point, address can be increased
or decreased by pressing the “▲” or “▼” key. This address intends to distinguish different
dampers. The default address is 16. By pressing the “On/Off” key, this setting will exit. When
there is no any key operation in 20 seconds, this setting ends and becomes valid.
4. Outline Dimensions
Fresh air outlet
Fresh air outlet
Polluted air inlet
Polluted air outlet
Figure 10 Outline Dimensions\

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Model A A1 B B1 C C1 D E F G H N
CH-HRV3.5 879 823 800 852 306 125 90 125 175 136 416 197
CH-HRV5 879 823 800 852 306 125 90 125 175 136 416 197
CH-HRV8 1016 960 832 884 380 165 90 150 230 155 372 246
CH-HRV10 1016 960 832 884 380 165 90 150 230 155 372 246
CH-HRV15 1215 1159 1210 1262 452 200 100 190 277 178 737 297
CH-HRV20 1215 1159 1210 1262 452 200 100 190 277 178 737 297
5. Installation Instructions
5.1 General
The user should entrust HVAC engineers for equipment selection and design and invite the
qualied construction organization for on-site construction. Both design and construction should
comply with corresponding national regulations and codes. When the unit fails to operate normally
owing to improper installation, service charge will be required.
5.2 Engineering Design
Two passages of ducts for ventilation are required for the dual-direction ventilation. One is used
to discharge polluted air inside out, and the other is used to bring fresh air inside. When passing
through the duct, certain resistance will be produced. The larger the resistance it, the smaller the
air ow is. Besides, length and size of the pipe, quantity of the bends also would affect the air ow.
Therefore, do the design as stated below:
(1) Generally each passage for ventilation does not exceed 15~30m. Internal sectional area
depends on inner air ow. Air ow for the main pipe is about 8m/s and for the branch is
5m/s.
(2) When the rectangular duct is used, proportion of two neighboring sides cannot exceed 4.
The duct should be made of non-inammable materials.
(3) The bends should be kept as few as possible and do not exceed 3 for each passage. The
curving part of the bends should be round-arc, and the straight angle should be avoided, as
shown in the gure below.
Figure 11 Bend Type Figure 12 Pipe Arrangement
(4) The duct wall should be smooth, dustless and pucker-free.
(5) Resistance to the air opening should be kept as less as possible. It is suggested to install no
less than 200×200mm rectangular aluminum alloy diffusers or dual-layer grilles. If it is the
water-proof grille, its size should be 3~4 times that of the sectional area of the connected
duct and blade shape of the grille should facilitate passing of air ow. See gure 13 for how
to select diffusers and grilles.

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(6) In order to prevent discharged air returning back, distance of two air openings at the wall
should be kept larger than 1000mm, as shown in the gure 14.
距离
<1000mm
距离>
1000mm
Figure 13 Shape of the Air Opening Figure 14 Distance between Air Openings
(7) When it is expected to minimize indoor noise, it is suggested to install a mufer inside the
pipe. Please contact a specialist for how to select the mufer. Generally, the mufer can
make noise reduced by 4~6dB.
(8) When an electric heater is installed, it should be interlocked with the ventilator. That is, the
electric heater will work only when the ventilator has been started. Ducts within a distance
of 800mm with the electric heater and ducts which go through a room where there is a re
source, they should be made of non-inammable materials.
(9) The ltering element should be replaced periodically. Therefore, a certain distance should
be kept at one side for maintenance.
(10) A steel hanger frame should be pre-buried before installation. Type and size of the hanger
frame depends on weight of this product. For the retrotting project, drill holes at the ceiling
for the hanger frame, as shown in the gure 15(a). When hole drilling is unavailable, locate
the reinforcing steel inside concrete and take it as the hanger frame, as shown in gure
15(b).
Reinforcing steel
Hanger frame Ceiling
Hanger frame Ceiling
Figure 15 (a) Figure 15 (b)
When the ceiling is damaged during installation of the hanger frame, it should be repaired
before completion of this project.

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5.3 Installation Diagram
Discharge air duct
Fresh air duct
Fresh air inlet
Insulation
Polluted air outlet
Polluted air inlet Fresh air outlet
Return air Supply air
Note: outdoor ducts connected with the fresh air inlet and polluted air outlet should be insulated,
so do indoor ducts when temperature and humidity is quite high inside the ceiling. Besides, the
indoor ducts should keep a certain gradient (1/50~1/30) to prevent water entering inside.
For convenient cleaning to maintenance to the internal lter and heat exchanger, please keep a
certain inspection and maintenance space. See gure 17 for the access hole.
Access door
Fresh air outlet Polluted air inlet
Polluted air outlet
Fresh air inlet
Figure 16 Installation Diagram of CH-HRVSeries

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6. On-site Construction
6.1 Installation of the Controller
(1) Firstly, locate the installation place and make a slot or hole for the communication lines.
(2) When the control and the indoor unit are installed on the wall surface, use 1# PVC pipe and
the slot as shown in the gure 18. When they are concealed installed, only 1# PVC pipe is required,
as shown in the gure 19.
(3) After that, as shown in gure 20, drill two holes as per installation holes at the base plate of
the control, insert a wooden cork inside the hole, x the control on the wall through these two holes,
connect the communication line and put the front panel on.
Note: during installation, pay attention to the direction of the base plate. The side with two
notches should be downwards; otherwise the installation of the front panel would fail.
Figure 18 Figure 19 Figure 20
No Description Remarks
1 Wall
Installation gures shown above are just for reference.
2 Base plate
3 Screws M4X25
4 Front panel
5 Screws ST2.2X6.5
Note: the communication distance between the main board and the control can be up to 20m
(the standard is 8m).
6.2 Fabrication of the Duct
(1) All sheet and sectional materials should be with certicate of qualication.
(2) Thickness of the steel should comply with requirements on the drawing.
(3) There should be no crack, scar and watermark on the galvanized steel but crystal pattern.
(4) Size of the duct should comply with design requirements.
(5) Joint of the duct should be airtight, even, crack etc.
(6) For the duct, angle should be straight, round arcs should be even and unevenness should
be within 5mm.
(7) Connection between the duct and the ange should be fastened and anging width should
be no less than 6mm. Holes spacing of anges should meet design requirements and construction
regulations
(8) Surface of the carbon steel ange should be applied with red anti-rust paint and coating

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should be even and closely-packed.
(9) See the table below for allowable deviation for the duct and ange.
Allowable Deviation for the Duct and Flange
No Item
Allowable
Deviation
(mm)
Inspection Method
1OD of the round
duct
φ<=300mm 0
-1 Meansurement by the ruler
φ>300mm 0
-2
2Long side of the
rectangular duct
<=300mm 0
-1 Meansurement by the ruler
>300mm 0
-2
3Diameter of the round ange +2
0Meansurement by the ruler
4 Longer side of the rectangular duct +2
0Meansurement by the ruler
5 Differential of diagonals 3 Meansurement by the ruler
6 Evenness 2
Meansurement by the feeler
7Smoothness of welding joints 1
Notes:
⑪
The absolute value of differentials of diagonals of the rectangular duct should be |L1-
L2|<=3, as shown in gure 21.
⑪
For flanges at two ends of the bend of the rectangular duct, the squareness tolerance
should be 3.0 (90°), as shown in gure 22.
Figure 21 Figure 21

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7. On-site Construction Requirements
(1) Never lay wires, cables and pipes with toxic, inammable or explosive gas or liquid in the
duct.
(2) The dismountable ports and adjustable parts of duct and ttings cannot be installed in the
wall or ceiling.
(3) Foreign matters in or on the duct and ttings should be cleaned before installation.
(4) The construction of bracket or hanger of the duct should accord with the following
specications:
① The build-in fitting, setting nail or expansion bolt for bracket or hanger should be placed
correctly and rmly .The inlet part should be free of oil stains and painting.
② The layout of the bracket or hanger should accord with design specications. If there is no
design specication, following specications will apply.
a. Pole bracket or inclined bracket is applicable for horizontal duct against wall or pole and
support bracket for that far from wall or pole. Strip hanger is applicable for the duct with
diameter or length of side less than 400mm.
b. Arm bracket or inclined bracket is applicable for vertical duct against wall or pole and
anchor ear bracket for that far from wall or pole .The vertical pipe outside the room or on
the roof should be xed with derrick or dragline.
③ The hanger’s rod should be at and its screw thread should be intact and smooth. Either
threaded connection or welding is suitable for joint of hangers. If the former one is adopted,
connecting thread of either end should be longer than diameter of hanger; moreover, anti-
loosing measure should be made. If the latter one is adopted, lapping joint is applicable and
its length should be 6 times longer than diameter of hanger at least at two sides.
④ Holes on the bracket and hanger should be drilled mechanically and never by gas cutting.
⑤ For the rectangular duct, clamps for the rectangular should contact the duct tightly, angle
should be straight, and space for the screw at the joint should be reserved. For the round
duct, clamps should be arranged evenly and its inner diameter should be the same with the
outer diameter of the duct so as to contact the duct tightly.
(5) The bracket and hanger cannot be set at air vent, valve or service door. The hanger cannot
be directly xed at ange. The distance between horizontal duct bracket and hanger cannot
exceed 4m.If the duct is installed vertically, the distance between them should not exceed
4m and the built-in ttings of each vertical duct should be more than 2 pieces.
(6) The duct flange, hanger and hanger for equipment should be coated with anticorrosion
paint.
(7) The oor and wall which the duct passes should be repaired after construction. The holes
on the external wall should be kept 2/100 gradient at level direction (the internal is higher)
to avoid rainwater into the room.
(8) Installation of duct and connection between the air vent and duct should be rm. The frame
and decorative surface should be solid, external surface should be level and in-deformable
and adjustment should be exible.

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8. Electric Wiring
The electric wiring attached to the electric box always prevails.
(1) CH-HRV3.5,CH-HRV5, CH-HRV8, CH-HRV10
Humidity
sensor
United
control
Note:
1.When need humidifier,connect "1" and "2" terminal (220V～，1A) to the contactor coil of the humidifier.
Meanwhile,connect the humidification sensor to HUMIDITY terminal on the main board.
2.Wire the CN9 on the main board to the united control to access a center control to the air valves.
3.The part with broken line is optional for user.
PE
PE XT1
HUMID
AC-N HUMIDITY
CN5 CN9 Wired
Ccontroller
Remote
Control
CN2
CN7
AP1
AC-L
L
N
POWER
Humidifier
AC Contactor Coil
◆When the humidier is requried, wire the wiring board termianl 2 (220V) to the humidier AC
contactor. Meanwhile, prepare and insert a humidity sensor into the corresponding termianl at
the main board.
◆Parts enclosed with broken lines should be prepared by the user.
◆Power lines also should be prepared by the user.
(2) CH-HRV15, CH-HRV20
Wired
Ccontroller
Remote
Control
HUMID
AC-N
HUMIDITY
CN5 CN9
CN2
CN7
AP1
AC-L
POWER
XT1
PE
PE
L1
L2
L3
N
Humidity
sensor
United
control
Note:
1.When need humidifier,connect "1" and "2" terminal (220V～，1A) to the contactor coil of the
humidifier.Meanwhile,connect the humidification sensor to HUMIDITY terminal on the main board.
2.Wire the CN9 on the main board to the united control to access a center control to the air valves.
3.The part with broken line is optional for user.
Humidifier
AC Contactor Coil
◆When the humidier is requried, wire the wiring board termianl 2 (220V) to the humidier AC
contactor. Meanwhile, prepare and insert a humidity sensor into the corresponding termianl at
the main board.
◆Parts enclosed with broken lines should be prepared by the user.
◆Power lines also should be prepared by the user.

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8.1 Wiring Installation
8.1.1 Wiring Arrangement
◆Layout of wires should accord with national wiring standards.
◆The power supply must be under rated voltage and used especially for this product.
◆The power supply should be reliable to prevent terminals from being stressed. Never pull the
power cord forcibly.
◆Size of the power lines must be large enough. The broken power line should be replaced with
the dedicated line.
◆All of the electric installation must be performed by qualied technicians according to local
laws and regulations and instructions.
◆The grounding wire should be reliably connected with special grounding device and
performed by qualied technicians.
◆Air switch and leakage switch which can cut off the general power supply should be installed.
◆The air switch should integrate the functions of magnetic release and hot release to protect it
for short circuit or overload.
◆The eld wiring should be subject to circuit diagram attached on the unit.
Applied models Power supply
Capacity of air
switch
(A)
Min. sectional area
of grounding wire
(mm2)
Min. sectional area of power
cord
(mm2)
CH-HRV3.5K 220V~50Hz 6 1.0 1.0
CH-HRV5K 220V~50Hz 6 1.0 1.0
CH-HRV8K 220V~50Hz 6 1.0 1.0
CH-HRV10K 220V~50Hz 6 1.0 1.0
CH-HRV15M 380V 3N~50Hz 6 1.0 1.0
CH-HRV20M 380V 3N~50Hz 6 1.0 1.0
Notes:
a. The power lines for this product must be copper cored cable, and working temperature
cannot exceed the specied value.
b. When the power lines exceeds 15m, please enlarge its sectional area to avoid incidents
caused by overloading.
8.2 Grounding
◆Reliable grounding measure must be adopted. The yellow green grounding can never be cut
off and xed with tapping screws so as to avoid electric shocks.
◆The grounding resistance should comply with the local standard.
◆Power supply must be reliably earthed. The grounding wire cannot connect with:
a. Tap water pipe;
b. Gas pipe;
c. Blowing tube;

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d. Place which specialist considers unreliable.
Warning: Cut off the power supply before installation and maintenance to avoid electric shock.
Wiring arrangement should comply with corresponding requirements, otherwise it would lead to
electric shocks or res etc.
Special Notice: C&H won’t be responsible for adverse results caused by modication of the
electric control system by the users themselves without consent of C&H.
8.3 Trial Run and Routine Maintenance
Check wirings and perform trial run after installation work.
◆Check before Trial Run
(1) Check of the pipeline system
According to design drawing and this manual check layout of ducts, firmness of hangers,
anticorrosion paint and items stated above which should be paid attention to, operation space for
replacement of the air lter, installation location of the duct silencer, inside or top of the duct or
equipment, and rmness of installation.
(2) Check of the electric circuit system
According to the circuit diagram, check for the incoming lines, connection method, connections
and power voltage.
◆Trial Run
(3) Turn on the unit. Refer to Section 6.1 for more details.
(4) When there is any unusual condition, cut off the power supply immediately for
troubleshooting.
◆Routine Maintenance
The air lter must be installed, if not, the heat exchanging core will be covered with feculence
and dust so that its performance will be reduced. If airflow volume or discharge air volume is
obviously decreased, the lter should be replaced. Replacement period can be displayed through
the controller and can be changed according to actual conditions in each area. The replacement
method is quite simple. That is, open the access door, take out the old lter, place the new one, and
then close the access door.
Remember to cut off the power supply before installation and maintenance to avoid electric
shock. Wiring arrangement should comply with corresponding requirements, otherwise it would
lead to electric shocks or res.

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8.4 Troubleshooting
After trial run, the unit can be normally used by the user. If any fault occurs resolve it rstly by
yourself according to the following table.
Symptons Possible causes Solutions
Airow volume at air outlet/inlet
is obviously decreased after a
period of time.
Too much dust gathers on the air lter. Replace or clean the air lter.
Noise occurs at the air vent. Installation of the air vent is loose. Re-x the air vent.
The system fails to be started.
●Power failure or incorrect power
lines
●Loosened transformer terminals at
the main board
●Communication error
●Damper or relative parts error
●Unconnected damper control at the
main board
●Recover power supply and check for
wiring of the power supply.
●Reconnect the transformer terminal.
●Check for connection between the
controller and the main board.
●Check for the by-pass damper and
the drive.
●Connect it.
9. Safety Precautions
◆Before installation, please carefully read this section carefully.
◆Be sure to comply with statement listed below to prevent damage or personal injury.
◆Damage or personal injuries can be classied as below.
Danger This mark means that dangerous cases like death or serious harm will happen.
Warning This mark means that dangerous cases like death or serious harm may happen.
Notice This mark means that injury or damage to property may happen.