Airrex AD Series Instructions for use

rev0-2017
MODEL : AD-1250 / AD-2470 / AD-4890 / AD-7290
English / Finland(Suomi) / Sweden
Operating Instruction & Parts Manual
English ver.
AIRREX DC HEATER

2rev0
Contens
Cautions 3,4
Precautions Before Use 4
Main Features of Airrex DC Heater 5,6
Wiring Diagram 6
Specications 7,8
Installation 9,10
Preparation & Operation 11,12
Self Diagnostic Codes 13
Maintenance & Parts 13
Warranty 14
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or
maintain the product described. Protect yourself and others by observing all safety information.
Failure to comply with instructions could result in personal injury and/or property damage!
Retain instructions for future reference.
▶Thank you for purchasing an AIRREX DC HEATER. Before operation please read this user's manual carefully.
▶Keep this manual readily available.
▶It is ESSENTIAL that you read it carefully before use, and follow it at all times.
▶Please complete the warranty form now and keep in a safe place.
▶We have a policy of continual improving to our products. The contents (features and specifications)
in this manual are therefore subject to change without notice.

3
rev0
Cautions
Danger
Danger
Warning
Warning
Caution
※Read this before using the product.
■The instruction manual can be amended without prior notice.
■Do not operate it at where there is a risk for explosion.
To avoid explosion, do not operate this product at where there is a risk for explosion. Or, it is necessary
to verify that it can be operated at the risky place.
When using the equipment, it is necessary to follow the items below.
1. Before connecting power supply, do not fail to check the polarity. (+ Red, - Black)
2. Install the equipment in the manner that duct and outlet are not blocked.
3. Do not block the fan or put any foreign matters while using it (To avoid the fan damage or overheating)
4. To protect the product, do not take out the installed fuse or replace it with other materials
(i.e. gum paper, aluminum foil, etc.)
5. Replace the fuse with the same capacity one, and make sure that it is rmly xed. In addition, do never
take out the fuse after replacing it.
6. Avoid fuse heating and damage due to the loosened fuse terminal.
7. When connecting power supply to the main body, make sure that the connection is correct before using it.
(Loosened terminal can cause overheating or deteriorated performance of the product)
8. When using wires other than included, make sure to check the dimensions.
9. This equipment must be operated by the well-trained and skilled operators.
►Safety symbols as below are used throughout this manual.
►To maximize the performance of DC HEATER, read this product manual thoroughly.
■ Please read this instruction manual thoroughly before using the product.
■ Please learn the precautions for safety before using the product.
■ Please keep this manual around for using in the future.
It means dangerous results such as serious injury or death can
be caused due to wrong use of equipment.
It means dangerous results such as serious injury or death can
be caused due to wrong use of equipment.
It means dangerous results such as minor injury or damage
to asset can be caused due to wrong use of equipment.
Introduction
Safety Instructions

4rev0
Cautions
Precautions Before Use
Caution
1. This product works with the surplus power from the generator working in conjunction with vehicle engine,
so it can be normally operated during normal driving. When using it without starting the engine or
with low RPM of engine, the battery can be fully drained. With additional battery installed, it can be used
for a long track of time. (To protect the battery, the heater is stopped due to safety device when the voltage
decreases under certain voltage.)
2. This product is only for use as an auxiliary heater.
3. With the power supply cable extended, the performance of heater can be deteriorated.
Safety Precaution for Use
1. When using the device, it is always needed to observe the basic safety precautions as follows.
2. Before using the equipment, read all the instructions of user manual. Furthermore, store the manual
in the manner that it can be referred to whenever necessary.
3. This equipment must be operated by a well-trained and skilled operator.
4. Before using the equipment, check if the local safety regulations and standards are observed.
5. Do not use the equipment other than the intended purposes.
6. Electronic units must be maintained by the technically-qualied persons, or under the guide and
supervision of those persons.
7. For wiring, watch out for short (short circuit). (Danger for re & vehicle damage)
8. Do not install and use the product other than the auxiliary heater.
9. Never attempt to disassemble, repair, or remodel the unit.
10. If the equipment is damaged due to the design change without prior notice from Hephzibah Co., Ltd,
we are not responsible for the damage.
11. General maintenance and inspection must be carried out only by a qualied person.
1. Before connecting power supply, do not fail to check the positions for Red (+) and Black (-)
poles. If poles are connected in opposite ways, vehicle electrical system can be damaged.
2. Make sure that air intake or outlet of the heater is not blocked before starting the heater.
(When they are blocked, E3 error is displayed. It operates again when the internal temperature is decreased).
3. Do not block the fan or put any foreign matters while using it (To avoid the fan damage or overheating)
4. Replace the fuse with the same capacity one, and make sure that it is rmly xed.
5. When connecting power supply to the main body, make sure that the connection is correct before using it.
When using the equipment, it is necessary to follow the items below.

5
rev0
"AV Heating Element", which is applied to this product, is the world-rst invented excellent heating element.
Heating value of "AV Heating Element" is variable according to the ambient temperature, so the heating value
can be actively changed with a range of 30% when opening or closing the doors. With a long-time usage,
the performance is not deteriorated, and it can be used for a long time. This is a very safe DC heating
element due to its low surface temperature.
This product automatically monitors the problems of all power supply lines for generator, condenser, and
power supply circuit so that the heater can normally operate. If any problem is detected, it cuts the power
automatically to prevent inabilities to start engine and to provide safety.
When abnormal condition is detected with the power supply, indicator (red color) is lit on the remote
controller
and the power supply is cut if the condition is not solved within 3 seconds.
For safety, this product monitors power supply condition in real time. Thanks to the design of safety memory
circuit, when monitoring circuit cuts the power to heater, the heater is not restarted even if the circuit is
recovered. Therefore, before starting the heater again, it is necessary to delete all memories by pressing
OFF button of the remote controller for 2 seconds or longer and then press the Power button.
(For the safe and ecient use of product according to the usage environment, low-voltage limit is set in
2 modes. To change the basic value, refer to how to change the mode (See 6.4 for the details).
This product is designed to change the temperature by 1℉, from 32℉to 104℉. From the remote controller,
press ▲button on the left-side temperature adjustment part to increase the temperature and ▼button to
decrease the temperature. When the ambient temperature reaches the setting temperature, power supply is
cut, and when the ambient decreases 2℉ from the setting temperature, power is supplied again so that
the temperature can be controlled with a hi gh accuracy.
To provide maximum safety, double-layered overheating protection is equipped with this product.
When the heater is covered or blocked, blower motor broken, or foreign matter interrupts the ventilation
causing overheating problems, the temperature sensor that is attached to the heating element will turn o
the power supply for safety.
When the use of heater is completed and the power supply is cut, latent heat of the heater is fully discharged
for safety. When the power supply is cut while the heater is operating, the blower motor slowly reduces its
speed to discharge the latent heat before stop the operation.
The heating element is warmed up gradually, according to the heating intensity increasing, the blower
motor's revolution is increasing. This is a fuction to prevent cold wind supply by increasing the motor speed
slowly according to the heating element warming up.
Main Features of Airrex DC Heater
AV (Activity Variable) Heating Element
Automatic Low Voltage Detection and Shut Down
Temperature Setting
Overheating Prevention
SLOW STOP Function
SLOW START Function

6rev0
Main Features of Airrex DC Heater
When operating the heater, LCD display of the remote controller automatically shows voltage,
current temperature, temperature setting, and air volume, so that the user can understand
the current operation status at a glance.
Latching relay is a high capacity component that can be used up to 100A input. General relay should have
a certain amount of electricity supplied, but this latching relay, of which electric supply is only used for 1 sec.
or less, and cut the supply. By doing this, it's much safer component than normal relay, and has high
durability of contact point.
The included highly-sensitive sensor can change the detection range to 59 inch from the main body according
to the usage environment. So it can control the ambient temperature with a high accuracy.
Monitoring Function
Latching Relay
Highly-Sensitive Temperature Sensor
Wiring Diagram

7
rev0
ControllerMain Body
Main Power Cable
Manual
Power Voltage DC 12V DC 24V DC 48V DC 72/80V
Power Consumption 500W 700W 900W 900W
Dimensions (WxDxH) 270 X 220 X 115mm
Weight 1.9kg 2.0kg
DC HEATER Specifications
DC HEATER Component
Specications
270
115
220
Screws
Mounting Plate
MODEL AD-1250 AD-2470 AD-4890 AD-7290

8rev0
No. Parts name No. Parts name No. Parts name
1 Temperature Sensor 8 Inlet Dust Filter (LH) 15 AV Heater Element Ass'y
2
Controller Connection Wire 9 Wind Guard (RH) 16 Heater Cover
3 Upper Case 10 PCB Ass'y (RELAY) 17 Bottom Case
4 Inlet Filter (RH) 11 Wind Guard (LH) 18 Mounting Plate
5 Impeller(RH) 12 Grommet (UPPER) 19 Main Power Cable
6 Motor 13 Grommet (LOWER) 20 Remote Controller
7 Impeller(LH) 14 Wind Protector
Specications
Assembly Drawing
Parts List
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9
rev0
Installation ※In this section, it describes how to install and use
the heater and the remote controller.
How to install the Airrex DC heater is dierent according to the type of vehicle, installation type and
installation location. In addition, DC generator and battery specications make a dierence in the product
specications and how to install. This manual only describes how to install the heater on a general type
vehicle. Full attention is required during the installation.
►When installing main body of the heater, mount the body with bolts or use mounting bracket according to
the installation conditions. Accordingly, measure the distance between battery and fuse box for wiring,
and decide where to install the controller an d wiring.
►When connecting the main power supply, check the locations and colors of (+) and (-) poles for
correct installations.
►The customer is solely responsible for damage caused by negligent connections.
► To avoid dangerous results due to incorrect connections, connect the wire correctly.
Do not use the main body as a step board or a support place for other components.
Main Body Installation, Power Connection, and Cautions
Mounting Plate Specifications
Ø5
Ø11
122
137 155
312
218
Dimensions (mm)

10 rev0
Installation
Installation
Warning
Caution
■ Do not use it while the wires are not rmly connected to the battery terminal.
■ Contact failure can cause spark (electric spark) resulting in explosion and engine start failure.
■ When connecting the power cable, check the polarities. (+ Red, - Black)
■ Open the outlet and energize the equipment to use.
■ Do not put any foreign matters in the outlet or left & right intakes.
Before installation, check the power cables and fuses.
Turn the car key to OFF position
Check the power voltage specications for the model
and connect it with battery.
►When connecting the wire to battery, check
the positions for Red (+) and Black (-) poles.
►If poles are connected in opposite ways, vehicle
electrical system can be damaged.
Red(+)
Red(+)
Black(-)
Black(-)

11
rev0
■ When the battery power is not enough, the low-voltage warning indicator (red color) is lit on the controller.
■ If the power is not recovered even after the low-voltage warning, the controller automatically stops
the heater operation.
■ To use the heater after low-voltage warning, the battery needs to be charged.
1. Temperature Display
Number in the display ①is the ambient temperature.
2. Setting Temperature
Number in the display ②is the setting temperature.
3. Voltage Display
Number in the display ⑤is the battery voltage.
4. Wind Volume Display
In the display ③, indicator is lit on from step 1 to 4,
to show the wind volume state.
5. Wind Volume Control
When pressing ▲button ④ located on the right side of
wind volume controls, the volume is increased and
▼button is used to decrease the volume.
6. Power Button (ON/OFF)
By pressing ON/OFF button of display ⑧for 2 seconds
or more, main body can be activated or deactivated.
7. Temperature Control Button
By pressing ▲button of the display ⑦, temperature
setting can be increased up to 104℉(Holding the button
pressed increases the setting continuously).
By pressing ▼button, temperature setting can be
decreased to 1℉. (Holding the button pressed decreases
the setting continuously).
8. Low-voltage Indicator
When the battery of display ⑥is not suciently charged to
operate the equipment, warning indicator is on and
the heater is stopped.
①
②
③
⑥
④
⑧
⑤
⑦
Preparation & Operation
Controller
Others
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* For low-voltage indicator, lower limit can be changed for
the low voltage according to the usage environment
(The default mode is MODE 1)
* With the same changing method, mode can be changed.
* When batteries are removed from the remote controller,
all the functions are returned to the defaults, so it will be
necessary to set the values again as desired.
By pressing Up and Down
buttons of wind volume control
for 5 seconds, the standard value
of the current voltage display
blinks 3 times and sets.
Low-voltage Warning Setting Value
MODE DC12V DC24V HOW TO CHANGE MODE
1 10.5V 21.0V
2 9.5V 19.0V

12 rev0
Preparations for Operation
Operation Condition
Operation
►Mount the main body and make sure that the wiring is correct.
►Make sure that wiring is firmly fixed.
►Make sure that the main body and controller is firmly fixed
This product is a heater warming up the indoor air. The efficiency is affected by the inflowing outside air,
insulation, and space size.
This product is a heater using battery power. So the usage time of products varies according to the car battery status.
Power
Press ON/OFF button located in the center of the remote controller
for 2 seconds to open or close the power with electrical sound.
Temperature Control
Use Up and Down buttons on the left side of the temperature
control buttons and the temperature setting is displayed on
the upper-right corner of the remote controller
(Press the button continuously to control it continuously).
If you want to change temperature unit ℉↔ ℃, push ▼
and ▲button (temperature control buttons) simultaneously
for 5 sec.
Remote Controller Display
On the display, current air temperature (upper left) and battery
voltage (bottom left) are displayed.
Use Temperature Control button (Up/Down) to increase or
decrease the temperature. When ambient temperature reaches
the setting temperature, heater stops. It works until the ambient
temperature reaches the setting temperature. Additionally,
when surplus power is drained from the battery, the built-in
low-voltage cutoff automatically cut the power.
(When the equipment doesn't work due to low voltage, charge
the battery sufficiently so that the equipment works.)
Current temperature and battery voltage are shown on
the upper left of the display, and temperature setting is shown on
the bottom left of the display.
Wind Volume Control
With Up/Down buttons for wind volume, wind volume
can be controlled.
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Preparation & Operation

13
rev0
Check List
►Check wiring and fuse short
(Check + and - poles, process status of power and ground terminals, and no-loosed fixings)
►Check battery capacity & generator capacity
(Check the battery and generator capacity of the vehicle, to decide the capacity of heater to be installed)
►Select the heater according to the usage
(Select heater capacity according to the usage conditions of consumers)
►Make sure that air intake or outlet of the heater is not blocked before starting the heater.
(When they are blocked, E3 error is displayed. It operates again when the internal temperature is decreased).
Sensor Problem
Sensor Problem
Bimetal Sensor
Problem
Temper Sensor Open
Thermistor(J7) short-circuit
·Abnormal temperature
increase of heating element.
·Motor failure
·Blocked air intake and outlet
Changed Temperature Sensor
Changed Thermistor
·Measure taken for normal
operation of motor
·Removing the cause of
problem at the intake
& outlet
Error Code Problem Cause Corrective Action
Self Diagnostic Codes
Maintenance & Parts
The Alarm light is activated if abnormal operation occurs, and an error code is displayed on the control panel.
In this case, the compressor will stop operating.
* Most problems are caused by the usage conditions. * Make sure that air intake and outlet are not blocked.
* For wiring, connect +(Red) and -(Black) at the correct positions.
※In this section, it describes what measures
have to be taken when the system doesn't
work in normal way.

14 rev0
Warranty
AIRREX DC HEATER is more reliable, comfortable, and durable the more they are
used. They are built under a strict quality guidelines which includes
inspection both during and after production and reliability testing.
In the unlikely event you have any problems, please contact your dealer or
distributor. If the problem is as a result of a production fault or failure, repairs will
be free of charge during the period of warranty subject to the following
warranty conditions:
1. If the problem has been caused by customer error or misuse, abuse or
damage, then all repairs will be charged for.
2. This warranty applies to your country.
3. Proof and date of purchase must be supplied.
4. Please complete the details below and keep this warranty in a safe place.
5. All transport charges back to the dealer are at the customers cost. Keep all
original packaging to facilitate return. Return to customer will be at dealers cost
(if genuine warranty claim).
Name of Company
Telephone No.
Name :
Address :
Telephone :
Months
DISTRIBUTOR
CUSTOMER
DETAILS
PRODUCT
SERIAL NO:
DESCRIPTION AIRREX DC HEATER
MODEL AD-1250 / AD-2470 / AD-4890 / AD-7290
DATE OF PURCHASE
WARRANTY PERIOD

15
rev0
MEMO.

●Designs and specifications of products are subject to change without prior notice for the improvement of products.
HEPHZIBAH CO.,LTD.
(Juan-dong) 86, Gilpa-ro
71beon-gil, Nam-gu,
Incheon, Korea
TEL : [phone]
FAX : [phone]
E-mail : [email protected]
Website : www.airrex.biz
IMPORTER : Rex Nordic Oy
Flätbackantie 1, 04150 Martinkylä,
Finland
E-mail : [email protected]
Website : www.rexnordic.com