Airrex AHSC-18 User manual

AIRREX Ha P
AHSC-18
USER’S MANUAL
▶ Thank you for purchasing an AIRREX Heat Pump.
BEFORE operation please read this user’s manual carefully.
▶ Keep this manual readily available.
▶ It is ESSENTIAL that you read the ‘NOTES ON SAFETY’carefully
before use and follow them at all times.
▶ The Heat Pump is specified for use on a 115V`~, 60Hz,1Ph
single phase power supply. You must check that the local
electricity supply is the same and have the appropriate plug fitted
by a qualified electrician.
▶ The Warranty form is on Page 15. Please complete it 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.

2
TABLE OF CONTENTS
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■ SAFETY INSTRUCTIONS
■ EXTERIOR DESCRIPTION
·Front View
·Back View
■ CONTROL PANEL FUNCTIONS
■ OPERATION
·Running & Stop
■ SELECTION of AREA/ROOM or SPOT COOLING or HEATING
■ ECONOMIC MODE
■ COOLING or HEATING TEMPERATURE CONTROL OPERATION
■ HOW TO SET THE 'OFF' TIMER
■ 'ERROR' and WARNING INDICATORS
■FIRE ALARM SIGNAL CONNECTION
■ ERROR SIGNAL CONNECTION
■ FIRE ALARM SIGNAL RESET
■ CLEANING AND MAINTENANCE
■ TROUBLE SHOOTING / ACCESSORIES
■ SPECIFICATIONS
■ WARRANTY

3
SAFETY INSTRUCTIONS
The following instructions are for ensuring the user’s safety and to prevent any physical
injury or material damage. Please read carefully and follow all instructions.
There are two sections to these instructions: WARNING and CAUTION.
The following symbols are for your guidance:
= You must NOT. = You MUST.
WARNING
Use a 115V~,60Hz, 1 Phase power supply only.
(Wrong supply may cause a fire and / or shock hazard)
Securely plug into an grounded outlet.
(Unless earthed, may cause electric shock)
Do not use a damaged power cable, plug or socket.
(Short, fire or shock hazard)
Do not remove plug by pulling cable or with wet hands.
(Risk of fire and electric shock)
Before cleaning, remove plug from socket.
(Otherwise risk of electric shock)
Do not place anything on top of the machine.
(This could cause electric shock, malfunction or injury)
Do not use an extension cord.
(Risk of fire and / or electric shock)
Ensure mains plug is clean and securely plugged in.
(Otherwise it may short causing smoke and fire)
Do not ‘kink’or sharply bend the power cable nor put any weight on it.
(The insulation may be damaged causing fire and/ or electric shock)
Do not turn off by removing power plug. Always turn off at control panel first.
(Risk of electric shock and / or malfunction)
Do not use this Heat Pump on unstable or inclined surfaces. Always use on solid
flat floor. (Risk of falling causing injury, fire or malfunction)
A damaged power supply cable must be replaced with a new power supply
cord obtained from the product manufacturer and not repaired.
Keep this manual in a visible location near the Heat Pump for easy reference.

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SAFETY NOTICE
GENERAL ADVICE BEFORE USE
·Ensure the safety of the location in which Heat Pump is to be used.
·Ensure the floor or ground is smooth and sound.
·Ensure you allow at least 20inch air space all around the Heat Pump.
·When in position LOCK the casters to prevent rolling.
·Never use the Heat Pump at more than 2。incline.
·If you use condensate pump, connect with housing in the power box.(Electric panel)
FOR MAXIMUM EFFICIENCY
·In airtight areas use vertical exhaust into ceiling.
·If possible locate exhaust outlet through a window or door to outside.
·Exhaust ducting should be no longer than 6.6 ft. for maximum efficiency.
·Ensure correct electricity supply.
CAUTION
Do not place Heat Pump on uneven, unstable or inclined surface.
(This could cause malfunction)
When storing the Heat Pump, ensure that it is kept in a dry, cool place.
(To prevent corrosion and malfunction)
If not being used for some time or if lightening is present, always unplug
from power. (To prevent risk of electric shock, short circuit or fire)
Do not spray water on to the Heat Pump nor use solvents such as benzene,
thinner or alcohol for cleaning.
(There is a risk of electric shock and / or short circuit)
Designed for indoor usage.

5
EXTERIOR DESCRIPTION
FRONT VIEW
BACK VIEW
LOUVER
CONDENSER OUTLET
DIGITAL CONTROLLER
CASTERS 4"(FRONT LOCKABLE)
CASTERS 4"(REAR NO LOCK)
SERVICE COVER #1
CONDENSER FILTER
EVAPORATOR FILTER
SERVICE COVER #2
FIRE ALARM CONNECTION PORT
WATER TANK
POWER CORD

6
CONTROL PANEL FUNCTIONS
① Power : Use to power On / Off.
② : Raises or lowers temperature and/ or sleep (off) time.
③ Cool : Use to select cooling mode.
④ HEAT Mode : Use to select Heating mode.
⑤ FAN Speed : Controls fan high or low speed.
⑥ Off Timer : To set the length of time, once turned on, that you wish the
Heat Pump to run for. You can set 0~24 hours. Time intervals are
30mins. up to 10 hours and then 1 hour between 10 and 24 hours.
⑦ Room : If the LED is On, the displayed temperature is for Room temp. If the LED
is Off, the displayed temperature is for spot temp.
⑧ Comp. : When the compressor is operating, the LED is On.
⑨Error : Error signal
(E1 : High Pressure, E2 : Low Pressure, E3 : Sensor, AF : ANTI Freezing, AL : FIRE ALARM)
⑩Water Full: Red light indicates ‘Tank Full’. The compressor will shut off
automatically. Empty tank and replace in position to resume operation.
⑪ Align Drain Tank : The red light indicates the water tank is not in the correct position.
⑫ Display : Display Room/Spot temperature, the setting temp and sleep time in case of
setting them. When the user set the sleep timer, ‘hr’will be turned on.
(Display of 'LO' : under the 32℉, Display of 'HI' : over the 99℉)
⑤
①
②
③④
⑦
⑧
⑩
⑪
⑫
⑨
⑥

7
OPERATION
RUNNING & STOP
1. START BY PRESSING THE ‘POWER’BUTTON.
·Heat Pump will start up automatically.
·To STOP the unit, press the ‘POWER’button once again.
2. If you wish to operate on heating. press 'HEAT' button.
3.If you wish to operate on fan only, press the ‘COOL’button. To resume cooling,
press the ‘COOL’button again.
(Note : There is a 3 minute delay when switching functions to protect the compressor)
4. To change fan speed. press the high or low button.

1. If you want to display room temperature,
push cool and button simultaneously
for three seconds.
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SELECTION of AREA/ROOM or SPOT COOLING or HEATING
ECONOMIC MODE
To reduce the temperature of the entire room select 'Area/Room'.
For ‘targeted’cooling of machinery, servers, or people etc. select ‘Spot Cooling or Heating’.
2. If you want to change temperature unit
℉ ↔ ℃, push ▼ and ▲ button simultaneously
for three seconds.
If the compressor operation is stop in "Room Temp Mode", the Fan motor operation also is
stop in 3min. later.
In Room Temp Mode, If you want to go "Economic Mode",
Push Low fan (or High fan) button continuously for 3 seconds.
1.
2. If the Economic mode is effective, Room Mode LED is blink.

COOLING MODE
1. When power is ON, the setting temperature is
displayed. Default of setting temperature is
as below.
·50℉ in Spot Mode.
·60℉ in Room Mode.
HEATING MODE
1. When power is ON, the setting temperature is
displayed. Default of setting temperature is
as below.
·68℉ in Room Mode.
COOLING or HEATING MODE
2. When you push either or button, the
setting temperature is changed.
COOLING or HEATING MODE
3. The display showing the set temperature will
blink 3 times.
COOLING MODE
4. Display range & Setting range.
HEATING MODE
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COOLING or HEATING TEMPERATURE CONTROL OPERATION
Cooling operates when Room/Spot temperature is
more than set temperature.
Cooling stops when Room/Spot temperature is
less than set temperature.
Heating operates when Room/Spot temperature is
less than set temperature.
Heating stops when Room/Spot temperature is
more than set temperature.
Mode Display range Setting range
Room Temp 32℉~99℉ 60℉~86℉
Spot Temp 32℉~99℉ 50℉~86℉
Mode Display range Setting range
Room Temp 32℉~99℉ 68℉~99℉
ⓐ
ⓑ
ⓒ

10
HOW TO SET THE ‘OFF’TIMER.
This function enables you to set the length of time you want the Heat Pump to operate.
You can set the time period from 30min. to 24 hours in 30min. and 1 hour increments.
OFF TIMER LAMP IS ON
AFTER 1hr
1. When the Heat Pump is operating, press the ‘Off Timer’
button and set the length of time you want by
pressing ▲ or ▼. Each time you press the button
you will increase the ‘time to off’period by 30min.
up to 10 hours, and 1 hour thereafter up to 24 hours.
The display will show 0.5 for 30min and 1.0 for an hour.
e.g. One and half hours will show 1.5.
2. When you have finished setting the time period, the
‘Off Timer’lamp will be on which indicates
the Heat Pump is in sleep (Off Timer) mode.
3. If you press the ‘Off Timer’button during its
operation, the remaining time will be shown.
4. To CANCEL timing, press ‘Off Timer’button for ONE
second. It will then switch the timer off automatically.

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'ERROR' and WARNING INDICATORS
The machine’s safety devices will automatically signal any problems via the display window
on the control panel. The information below shows how to read these signals.
1. WATER FULL- Display shows “FU”
When the water container is full, “FU”is displayed
and the LED “Water Full”light will be on.
2. ALIGN WATER TANK
If the water tank is not positioned correctly, the LED
“Align Drain Tank”light will be on.
3. HIGH PRESSURE
‘E1’is displayed and the ‘Error’LED will be on
when the pressure of the compressor is too high and
the high pressure switch is open.
4. LOW PRESSURE
‘E2’is displayed and the ‘Error’LED will be on
when the pressure of the compressor is too low.
5. SENSOR PROBLEM
If the thermistor is short circuited or cut, ‘E3’is
displayed and the ‘Error’LED will be on.
6. ANTI FREEZING
When the temperature of the evaporator is below
25℉, ‘AF’is displayed and the ‘Error’LED will be on.
7. FIRE ALARM SIGNAL
When Fire alarm signal is received from Fire alarm system,
‘AL’is displayed and the‘Error’LED will be on.

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Output Terminal ER1 and ER2
The air conditioner will output an Error signal (normal
open dry contact) when an "Error" has occurred, to show
what the failure is on the air conditioner.
Input Terminal FA1 and FA2
When the signal from the fire alarm system is received,
the air conditioner turns off and does not operate until
the unit has been RESET.
* Connecting Error Signal with warning device
1. Remove 'Cap' and the 'Fire Alarm cover'.
2. Use recommended error signal wire size from 16 AWG
to 26 AWG for a solid wire, or 16 AWG to 22 AWG for
a stranded wire with ring terminal for #5 stud size.
3.
Connect the end of the error signal wire to ER1 and ER2,
and the other end to the compatible with various warning
devices such as alarm speaker, light indicators, and etc.
* Connecting the fire alarm wire from fire alarm system
1. Remove 'Cap' and the 'Fire Alarm cover'.
2. Use recommended fire alarm wire size from 16 AWG
to 26 AWG for a solid wire, or 16 AWG to 22 AWG for
a stranded wire with ring terminal for #5 stud size.
3. Connect fire alarm to terminal FA1 and FA2.
FIRE ALARM SIGNAL CONNECTION
ERROR SIGNAL CONNECTION
AIRREX Heat Pump
AIRREX Heat Pump
AIRREX Heat Pump
AIRREX Heat Pump

13
FIRE ALARM SIGNAL RESET
To reset the fire alarm, push "OFF TIMER" key for 5 seconds.
ERROR DISPLAY CONDITIONS
NO Error Display Error condition Error LAMP Error Signal Output
1 E1 High pressure Error ON
2 E2 Low pressure Error ON
3 E3 Sensor Problem Error ON
4 FU Water Full Water Full ON
5 AF Anti Freezing Error ON
6 TP Align Water Tank Align Drain Tank ON
7 AL Fire Alarm Error ON

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CLEANING AND MAINTENANCE
CLEANING THE AIR FILTERS
1. To remove filters, slide up a little ① and pull
towards you ②.
2. Clean the filters with water or compressed air.
3. Clean evaporator and condenser units with a
vacuum cleaner or compressed air.
MAINTENANCE
1. After cleaning, completely dry the inside of the
unit by operating on ‘Fan Mode’only for
3 to 4 hours.
2. Turn “OFF”at control panel, remove plug from
socket. Coil and store cable neatly.
3. Keep machine suitably covered to prevent
damage by damp, humidity and dust.

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TROUBLE SHOOTING
ACCESSORIES
NOT
WORKING
POOR
COOLING
TROUBLE CHECK REMEDY
● Power plug correctly connected ●Connect plug correctly
● POWER button “OFF” ● Press POWER button to “ON”
● Blown fuse in electric panel ● Replace fuse
● Fuse (supply) blown ● Exchange fuse in board
● Breaker on switch board ● Check load capacity and reset
tripped
● Ambient temp. too high ● Use only below Cooling 113℉ & Heating 81℉
(Cooling : over 113℉, Heating : over 81℉)
● Filter blocked with dust ● Clean Filter
● Dust in heat exchanger ● Clean heat exchanger
● Obstacle against inlet side ● Remove and allow 20inch.clearance
●Ambient temp. too high ●Use only below Cooling 113℉& Heating 81℉
(Cooling : over 113℉, Heating : over 81℉)
MODEL
ITEM
COLD AIR
&
HOT AIR
EXHAUST
DRAWING
AHSC-18
ALUMINIUM FILTER
CASSETTE for COND
ALUMINIUM FILTER
CASSETTE for Eva

16
SPECIFICATIONS
Power Cable
Max. Duct Length
Fuse in power box
in Machine body
Cooling
Heating
Operating Range
▶ High Pressure Switch ▶ Fan motor protection
▶ Low Pressure Switch ▶ Tank position indicator.
▶ Auto ‘Full Tank’shut off. ▶ 3 min. delay timer.
▶ Thermostat and relief valve for compressor
BTU/h
kW
Dimensions
(WxDxH)
16,800 (4.92)
18,500 (5.42)
Cooling current &
Power consumtion
Heating current &
Power consumtion
Cooling Capacity
Heating Capacity
AHSC-18
P o w e r S u p p l y 115V~, 60Hz, 1Ph.
inch. 19.5 X 26.6 X 52.2
Weight lb 210
Evaporator Air Flow ft3/m 423.6
kW/Amp. 1.83/15.9 (95℉ 40%)
kW/Amp. 1.84/16.0 (68℉ 60%)
Nema Plug 5-20
Refrigerant lb R-410A, 2.43
Air Filter Aluminium Mesh Cartridge
Safety Devices
DEVICE
Plug
Length 9.8 ft.
77℉ DB 60% RH ~ 113℉ DB 40%
50℉ DB 70% RH ~ 80.6℉ DB 50%
High Pressure
kgf/cm2/psig 31/440
Low Pressure
kgf/cm2 /psig 13/185
Exhaust Duct 32.8 ft.
250Va.c. 10amp.

17
PRODUCT
SERIAL NO:
DESCRIPTION AIRREX Heat Pump
MODEL AHSC-18
DATE OF PURCHASE
WARRANTY
AIRREX Heat Pump gives more reliable performance, comfort and durability
the more they are used. They are built under a strict quality assurance regime
which includes inspection both during and after production and exhaustive
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 undertaken free of charge during the period of warranty subject to the
following warranty conditions:
1. The warranty period is 12 months from the date of first purchase.
2. If the problem has been caused by customer error or misuse, abuse or
damage, then all repairs will be charged for.
3. This warranty applies to your country.
4. Proof and date of purchase must be supplied.
5. Please complete the details below and keep this warranty in a safe place.
6. 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.
DISTRIBUTOR
Name :
Address :
Telephone :
CUSTOMER
DETAILS
(Applicable to first retail purchaser only)
Warranty Period
( 12 ) Months

18
MEMO.

19
MEMO.

HEPHZIBAH CO.,LTD.
1385-15 JUAN-DONG, NAM-GU
INCHEON, KOREA
TEL : [phone]
FAX : [phone]
E-mail : [email protected]
Website : www.airrex.co.kr
●Designs and specifications of products are subject to change without prior notice for the improvement of products.
USA DISTRIBUTOR
AIRREX USA
P.O BOX 340
HEWITT, TEXAS 76643
TEL : [phone]
FAX : [phone]
[email protected]