Alhafidh WHA-H18000T3S User manual

WHA-C18000T3S
WHA-H18000T3S
WHA-H24000T3S
WHA-C24000T3S
WHA-C18000T3S
WHA-H18000T3S
WHA-H24000T3S
WHA-C24000T3S

When using this unit in the European countries, the follow informations must be followed:
DISPOSAL: Do not dispose this product as unsorted municipal waste. Collection of such waste separ-
ately for special treatment is necessary.
It is prohibited to dispose of this appliance in domestic household waste. For disposal, there are seve-
ral possibilities:
A) The municipality has established collection systems, where electronic waste can be disposed of at
least free of charge to the user.
B) When buying a new product, the retailer will take back the old product at least free of charge.
C) The manufacture will take back the old appliance for disposal at least free of charge to the user.
D) As old products contain valuable resources, they can be sold to scrap metal dealers.
Wild disposal of waste in forests and landscapes endangers your health when hazardous substances
leak into the ground-water and find their way into the food chain.
SOCIABLE REMARK

Inside you will find many helpful hints on how to use and maintain your air conditioner properly. Just a little preventive care on
your part can save you a great deal of time and money over the life of your air conditioner. You'll find many answers to comm-
on problems in the chart of Troubleshooting Tips. If you review our chart of Troubleshooting Tips first, you may not need to
call for service at all.
Contact the authorised service technician for repair or maintenance of this unit.
Contact the installer for installation of this unit.
The air conditioner is not intended for use by young children or infirm persons without supervision.
Young children should be supervised to ensure that they do not play with the air conditioner.
If the power cord is to be replaced, replacement work shall be performed by authorised personnel only.
Installation work must be performed in accordance with the national wiring standards by authorised personnel only.
CAUTION
Read This Manual
SAFETY PRECAUTIONS
Warning ..................................................................................................................................3
Caution ...................................................................................................................................4
Points for using air conditioner ................................................................................................5
Unit identification .....................................................................................................................5
OPERATION INSTRUCTIONS
Control panel ...........................................................................................................................6
Adjust air flow direction ...........................................................................................................8
Vent control ........ ....................................................................................................................8
CARE AND CLEANING
Air filter cleaning ....... .............................................................................................................9
Cabinet cleaning ......................................................................................................................9
Winter storage .........................................................................................................................9
TROUBLESHOOTING TIPS
Troubleshooting tips ...............................................................................................................14
INSTALLATION INSTRUCTIONS
Select the best location .........................................................................................................10
Installation of the housing .....................................................................................................10
Dimensions ............................................................................................................................11
Treatment of condensed water ..............................................................................................12
Installation steps ....................................................................................................................12
CONTENTS

Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be followed. Incorrect opera-
tion due to ignoring instruction will cause harm or damage.
The seriousness is classified by the following indications.
This symbol indicates the possibility of death or serious injury.
Meanings of symbols used in this manual are as shown below.
WARNING
Be sure to follow the instruction.
Be sure not to do.
WARNING
CAUTION
This symbol indicates the possibility of injury of damage to properties only.
Plug in power plug
properly
Otherwise, it will cause electric
shock or fire due to heat
generation.
It will cause electric shock or fire
due to heat generation.
It will cause electric shock or fire
due to heat generation.
It will cause electric shock.
It will cause electric shock or fire.
If the power cord is damaged, it
must be replaced by the manu-
facturer or an authorized service
center or a similarly qualified
person in order to avoid a hazard.
This could damage your health.
Do not modify power cord
length or share the outlet
with other appliances
Do not operate or stop the
unit by inserting or pulling
out the power plug.
Do not operate with wet
hand or in damp
environment.
Do not damage or use an
unspecified power cord.
Do not direct airflow at room
occupants only.

CAUTION
When the air filter is to be
removed, do not touch the
metal parts of the unit.
It may cause an injury.
Since the fan rotates at high
speed during operation, it may
cause an injury.
It may cause an electric shock.
When the unit is to be
cleaned, switch off, and
turn off the breaker.
Do not operate switches
with wet hands.
Do not clean the air
conditioner with water.
Water may enter the unit and
degrade the insulation. It may
cause an electric shock.
This could injure the pets or
plants.
It may cause a fire or deformation
or the cabinet.
Do not put a pet or house
plant where it will be
exposed to direct air flow.
Do not apply an insecticide
or flammable spray.
Ventilate well when used
together with a stove, etc.
An oxygen shortage may occur.
Do not use this air conditioner
to preserve precision devices,
food,pets, plants, and art
objects.It may cause
deterioration of quality, etc.
It may cause imperfect
combustion.
Do not use for special
purposes.
Do not put a heater, etc.
Where it is exposed to
direct air flow.
!!
!!
Be sure the electrical service is adequate for the model you have chosen. This information can be found on the serial plate,
which is located on the side of the cabinet.
Be sure the air conditioner is properly grounded. To minimize shock and fire hazards, proper grounding is important. The
power cord is equipped with a three-prong grounding plug for protection against shock hazards.
Your air conditioner must be used in a properly grounded wall receptacle. If the wall receptacle you intend to use is not ad
equately grounded or protected by a time delay fuse or circuit breaker, have a qualified electrician install the proper recept-
acle.
Ensure the receptacle is accessible after the unit installation.
Do not run air conditioner with outside protective cover in place. This could result in mechanical damage within the air con-
ditioner.
For your safety
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
Avoid fire hazard or electric shock. Do not use an extension cord or an adaptor plug. Do not remove any prong from the
power cord.
Electrical Information
Working temperature range
Cooling Operation
Outdoor temp: O
18-43 C (T1 Environment)
Indoor temp: O
18-32 C (T1 Environment)
O
21-52 C (T3 Environment)
O
18-32 C (T3 Environment)
Heating Operation
Outdoor temp: O
-5-24 C (T1 Environment)
Indoor temp: O
0 -27 C (T1 Environment)
O
-7-24 C (T3 Environment)
O
0-30 C (T3 Environment)
Note: Performance may be reduced outside of these operating temperatures.
Safety Precautions

Safety Precautions
Unit Identification
Accessories
Seal
(Used on
drain joint)
1
1
Screw
2 (For >18000But/h models only:
Used to fasten the front panel)
2 or 4 (For cooling & heating models only:
Used to install the drain tray)
Drain Joint
(Cooling only models)
1 pec
Drain Tray
(Cooling & Heating
models: >18000Btu/h)
Points for using air conditioner
NOTE: If the air conditioner is turned off, wait 3 minutes before restarting. This allows pressure inside the compressor equa-
lize. Failure to follow these instructions may be harmful to your unit.
Power supply voltage
If the power supplied to the unit is not within plus/minus 10% of the specified rating, the unit may not function and the fuse
may blow.
WARNING To reduce the risk of fire, electric shock, or injury to persons, read the Safety Precautions be-
fore operating this appliance.
The capacity of the room air conditioner must fit the room size for efficient and satisfactory operation.
Install the room air conditioner on the shady side of your room.
Do not block air flow inside with blinds, curtains or furniture; or outside with shrubs, enclosures, or other buildings.
Keep blinds and drapes in other windows closed during the sunniest part of the day.
Clean the air filter as recommended in the section Care and Cleaning .
Energy Saving Ideas
Noise level
Noise from the air conditioner will be louder at night than in the daytime. This is because noise in the surroundings is com-
paratively low at night. If you feel that noise of the air conditioner is too loud, switch the thermostat to lower numbers.
1pec
Drain Tray
(Cooling & Heating
models: <18000But/h)
1. Front panel
2. Air filter
3. Panel frame
4. Cabinet
5. Air intake grille(outdoor side)
6. Up/Down air flow
adjustment louvers
7. Control panel
8. Power cord
NOTE: The outline of the machine is
based on typical model, the function
is the same with your air conditioner
while some difference may exist in
appearance.

Operation instructions
The control panel of the unit you purchased may look like one of the following:
Control Panel
Operation instructions
THERMOSTAT
To set the desired room temperature, rotate the thermostat switch to the
desired setting. After the set temperature is achieved the thermostat will
automatically start and stop the compressor in order to maintain the
desired set temperature.
Rotate the thermostat selector clockwise for higher cool settings. Higher
cool settings will provide lower room temperature. Rotate the thermostat
selector counter clockwise for lower cool settings. Lower cool settings will
provide higher room temperature.
The thermostat is used to set the desired room temperature when the
unit is being operated in the COOL MODE.
NOTE: During the cooling operation of the unit, when the thermostat
knob is rotated clockwise, allow at least three minutes before turning
back the knob to the 1 direction. Otherwise the fuse may blow due
to an overload of the unit. DO NOT rotate the THERMOSTAT knob
beyond the range fron 1 to 12 .
Cooling only models
The controls featured in this manual are representative of many
available models. Your model may offer slightly different features.
3
6
9
112
COOLER
Cooling only models Cooling & Heating models
OFF ON
AUTO SWING
COOLER
1
6
39
THERMOSTAT
LOW
COOL
HIGH
FAN
LOW
FAN
HIGH
COOL
MED
COOL
OFF
SELECTOR
COMP.
WAIT THREE MINUTES BEFORE RESTARTING
THERMOSTAT
AUTO SWING SELECTOR
OFF
ON
COMP.
COOLER
HIGH
COOL
MED
COOL
LOW
COOL
HIGH
FAN
MED
FAN
LOW
FAN
WAIT THREE MINUTES
BEFORE RESTARTING
OFF
SELECTORTHERMOSTAT
AUTO SWING
112
9
6
3
WAIT THREE M INUTES BEFORE RESTARTING
HIGH
HEAT
LOW
HEAT
LOW
FAN
HIGH
FAN
LOW
COOL
HIGH
COOL
ON
OFF
COMP.
HEATER COOLER
COMP. indicator: This indicator light shows the
status of the compressor. When the compressor starts up,
it lights on; when the compressor shuts down, it lights off.

Operation instructions
SELECTOR
The controls featured in this manual are representative of many
available models. Your model may offer slightly different features.
Cool Mode
The desired cool setting is selected by rotating the knob to the right to
the appropriate location.
HIGH COOL has maximum cooling effect and airflow.
MED COOL has the intermediate cooling effect and airflow.
LOW COOL has minimum cooling effect and airflow.
HIGH HEAT has maximum heating effect and airflow.
LOW HEAT has minimum heating effect and airflow.
OFF will completely shut off the unit.
Fan Mode
Rotate the knob to the left to select your choice of fan speeds for air
circulation.
HIGH FAN permits high fan speed operation without cooling effect.
MED FAN permits med fan speed operation without cooling effect.
LOW FAN permits low fan speed operation without cooling effect.
Note: When selecting a fan speed, the compressor will not run.
Note
THERMOSTAT
Cooling & Heating models
To set the desired room temperature, rotate the thermostat switch to the
desired setting. The temperature you are setting gets higher from 6
to 1 , lower from 6 to 12 . After the set temperature is achieved,
the thermostat will automatically start and stop the compressor in order to
maintain the desired set temperature.
Thermostat
The thermostat is used to set the desired room temperature when the unit
is being operated in the COOL MODE.
NOTE: During the cooling operation of the unit, when the thermostat knob
is rotated clockwise, allow at least three minutes before turning back the
knob to the COOLER or HEATER direction. Otherwise the fuse may
blow due to an overload of the unit.
For the unit adopts PTC heater, when the SELECTOR is set to HIGH HEAT
or LOW HEAT, the THERMOSTAT is disabled. You cannot use the
THERMOSTAT to adjust the temperature.
112
9
6
3
HEATER COOLER
Cooling only models
HIGH
HEAT
LOW
HEAT
LOW
FAN
HIGH
FAN
LOW
COOL
HIGH
COOL
Cooling & Heating models
Selector
LOW
COOL
HIGH
FAN
LOW
FAN
HIGH
COOL
MED
COOL
OFF
OFF
HIGH
COOL
MED
COOL
LOW
COOL
HIGH
FAN
MED
FAN
LOW
FAN
When turning the SELECTOR knob from "LOW COOL(HEAT)" to
"HIGH COOL(HEAT)", keep your speed slow as far as possible. Do
not change the operation mode from "LOW COOL(HEAT)" to "HIGH
COOL(HEAT) too often."

AUTO SWING
OFF ON
Adjust air flow direction
Horizontal air flow adjustment
Vertical air flow adjustment (manually)
Vent control
The vent control is located above the control knobs. The operation
method is different on different models(see the figures on the left).
For maximum cooling efficiency, CLOSE the vent. This will allow I
nternal air circulation. OPEN the vent to discharge stale air.
To open the vent, pull the lever
toward you; To close it, push it in.
To open the vent, set the lever to the
right position; To close it, set the lever
in the left position.
CLOSE OPEN
NOTE: The VENTILATION LEVER should normally be kept in the
CLOSED position during cooling for maximum cooling effect. The
"OPEN" position is used only for ventilation.
Clean your air conditioner occasionally to keep it looking new.
Be sure to unplug the unit before cleaning to prevent chock
or fire hazards.
CAUTIONCAUTION
CLOSE VENT OPEN
Operation instructions
When the AUTO SWING switch is turned to ON position, the
vertical louvers automatically oscillate right and left sweeping
the cold air alternately to obtain comfortable cooling. The
vertical louvers may be stopped at any position when the AUTO
SWING switch is turned OFF .
To adjust vertical air flow direction, adjust any one of the
horizontal louver blades. When turning up or down the
horizontal louver blades, always keep horizontality the top or
bottom blades. This can effectively prevent water drops
condensed on the front panel of the unit.

Care and cleaning
Air Filter Cleaning
The air filter should be checked at least once a month to see if
cleaning is necessary. Trapped particles in the filter can build up
and cause an accumulation of frost on the cooling coils.
Hold the slot under the front panel, then uplift it onwards, and remove
the front panel.
Pinch the handle under the air filter and make the air filter arched,
remove it from the underside to upside.
Wash the filter using liquid dishwashing detergent and warm water.
Rinse filter thoroughly.
Gently shake excess water from the filter. Be sure the filter is thorou-
ghly dry before replacing.
Or, instead of washing you may vacuum the filter clean.
Note: Never use hot water over 40C (104F )to cleant hea irf ilter.
Never attempt to operate the unit without the air filter.
Care and cleaning
Remove the
air filter
NOTE: Never use water over 50C , alcohol, gasoline, acid, solvent
or brush to clean the front panel as this will damage the
surface of the part.
Winter Storage
If you plan to store the air conditioner during the winter, operating the
fan along for half a day to dry out the inside of the unit. Turn off power
and unplug the unit. Remove it carefully from the window according to
the installation instructions. Cover it with plastic or return it to the
original carton.
Never use harsh cleaners, wax or polish on the cabinet front.
Be sure to wring excess water from the cloth before wiping around
the controls.
Excess water in or around the controls may cause damage to the
air conditioner.
Plug in air conditioner after cleaning.
Cabinet Cleaning
Be sure to unplug the air conditioner to prevent shock or fire hazard.
The cabinet and front may be dusted with an oil-free cloth or
washed with a cloth dampened in a solution of warm water and
mild liquid dishwashing detergent. Rinse thoroughly and wipe dry.
(b)
(a)

Installation instructions
Installation instructions
Suggested tools
1. Screw driver (medium size Phillips)
2. Tape measure or ruler
3. Knife or scissors
4. Level gauge
75~150cm
Over 50cm
About 10mm
AWNING
FENCE
75~150cm
Over 50cm
About 10mm
AWNING
FENCE
Note: Unit may be supported by a solid frame
from below or by a hanger from a solid
overhead support.
Preferred method of installation into a timber
framed wall, partition or window.
Flash or seal around external
wall frame or architrave
Sturdy timber frame
all round unit
Timber framed
wall or partition
External support frame
at balance point of a/c
Alternatively, brackets
as illustrated below
may be used.
Drain pan
Select the best location
1. To avoid vibration and noise, make sure the unit is installed
securely and firmly.
2. Install the unit where the sunlight does not shine directly on
the unit. If the unit receives direct sunlight, build an awning
to shade the cabinet.
3. There should be no obstacle, such as a fence or wall, within
50cm from the back of the cabinet because it will prevent
heat radiation of the condenser.
Restriction of outside air will greatly reduce the cooling
and heating efficiency of the air conditioner.
4. Install the unit a little obliquely outward not to leak the
condensed water into the room (about 10mm or 1/4 bubble
with level).
5. Install the unit with its bottom portion 75~150cm above the
floor level.
6. The power cord must be connected to an independent cir-
cuit. The yellow/green wire must be grounded.
All side louvers of the cabinet must remain exposed to
the outside of the structure.
CAUTION
Step 1
Remove the air conditioner from its packaging, remove fixing screws,
front panels ( for some models) and slide the air conditioner out of
its housing (Refer to Installation Steps).
Step 2
Prepare the hole in the wall so that the bottom of the housing is well
supported, the top has minimum clearance and the air inlet louvers
have clearance as shown below in options A and B (see next page).
Holes from the outside through to the cavity should be sealed. The
housing should slope down towards the rear by about 10mm to allow
water formed during operation to drain.
Step 3
Install the housing into the wall and secure. Ensure the foam seals
are not damaged. Flash, seal or fill gaps around the inside and out-
side to provide satisfactory appearance and protection against the
weather, insects and rodents.
Installation of the Housing

Installation instructions
Installations of the unit into the wall
Alternative method of installation if external
support cannot be provided.
Flash or seal around external
wall frame or architrave
Sturdy timber
frame
Timber framed
wall or partition
Solid timber support
Steadying bracket
(one per side)
Drain pan
Ensure louvres
are entirely
outside the wall
AIR IN
AIR IN
AIR OUT
100mm minimum
OPTION A
AIR IN
LOUVRE
BRICK
WALL
O
45 BRICK CUT AWAY
TO CLEAR LOUVRES
FRONT
AIR OUT
AIR INAIR IN TOP
VIEW
O
45 BRICK CUT AWAY
TO CLEAR LOUVRES
100mm
BRICK
WALL
100mm
OPTION B
MODEL(Btu/h)
BODY DIMENSION(mm)
(W x H x D)
<18000
18000<Model<21000
600x380x527
>21000
Dimensions
661x427x742
Installation of the unit into the Housing
1. Fit the drain pan to the housing and attach a drain tube to a
suitable location if required.
2. Slide the unit into the housing until it is firmly against the rear
of the housing. Care is required to ensure the foam sealing
strips on the housing remain in position.
3. Engage the chassis fixing brackets into the bottom housing
rail and secure to the base with the screw provided.
4. Install the front panel as per the Installation lnstruction.
5. Connect the air conditioner to the power and position excess
cord length beneath the air conditioner base.
6. Switch unit on. Check for operation of the unit and check for
vibration in the installation.
660x427x645
Minimum norminal cross-sectional area of conductors:
Rated current of appliance
(A)
Nominal cross-sectional area
2
(mm )
0.75
1
1.5
2.5
Suggest Minimum Wire Size(AWG: ):American Wire Gage
Appliance Amps
AWG Wire Size
10
13
18
25
18
16
14
12
30 10
>3 and <6
>6 and <10
>10 and <16
>16 and <25

Installation instructions
TREATMENT OF CONDENSED WATER
SEAL
DRAIN
JOINT RUBBER
PLUG
To meet different requirement of different type of air conditioner,
there are two kinds of methods for your choice to treat the conden-
sed water.
For Cooling Only Models:
You can choose back drainage or non-drainage. See the following
procedures to perform back drainage:
1. Fit the seal onto the drain joint (which provided with your air
conditioner accessory).
2. Remove the rubber plug from the back of the unit.
3. Attach the drain joint to the back of the cabinet
where you remove the plug and rotate 90 to securely assemble
them.
4. Connect the drain joint with a extension drain hose (Locally
purchased)
O
For Cooling & Heating Models only:
You can choose bottom drainage . See the following procedures to
perform bottom drainage:
1. Remove the rubber plug from the bottom of the cabinet.
2. Take out the drain tray and screws (which provided with your air
conditioner accessory).
3. Install the drain tray at the bottom of the unit and secure with
screws provided.
4. Connect the drain hose to the outlet located at one side of the
drain tray. You can purchase the drain hose or tubing locally to
satisfy your particular needs (Drain hose is not supplied)
RUBBER
PLUG
SCREW
DRAIN TRAY
DRAIN
OUTLET
Installation Steps
Step 1. Remove the front panel and the air filter
1. Hold the slot under the front panel, then uplift it
outwards, and remove the front panel (See Fig.1).
2. Pinch the handle under the air filter and make the
air filter arched, remove it from the slot from
underside to upside (See Fig.2).
Fig.1
Fig.2

Installation instructions
Step 2. Remove the frame.
1. Remove the two fixing screws from the
frame (See Fig.3).
2. Grasp the left corner of the frame's
underside, then loosen the frame
(See Fig.4).
Step 3. Installation.
1. For <18000Btu/h models, remove the two
fixing screws on the chassis fixing brackets,
then remove the chassis fixing brackets;
For >18000Btu/h models, remove the four
screws located on both sides and the back
of the cabinet (See Fig.5).
2. Grasp the handle on the chassis and
carefully slide the air conditioner out of
the cabinet (See Fig.6).
3. If you hope the condensed water be
drained outside, install the drain tray
at the bottom of the cabinet(for cooling &
heating models); or attach the drain joint
to the back drain hole of the unit(for
cooling only models) (See Fig.7).
4. Push the unit chassis into the cabinet
(See Fig.8).
5. Fix the chassis and cabinet(See Fig.5).
Step 4. Install the frame.
1. Install the frame (See Fig.9).
2. Fix the screws on the frame (See Fig.3).
Step 5. Install the air filter and front panel.
1. Install the air filter into the frame's slot
from upside to underside (See Fig.2).
2. Hang the front panel on the frame's buckle,
then press the front panel into the frame's
slot until you hear a click (See Fig10).
Fig.5 Fig.6
Fig.8
Fig.3 Fig.4
Fig.9 Fig.10
NOTE:For some models, the panel and
frame are packed with the unit without
installation. In this case, only step 3, 4
and 5 may be performed.
Screws
Drain tray
Supporter
Cabinet
Wall
Fig.7

Troubleshooting tips
Before calling for service, review this list. It may save you time and expense. This list includes common occurrences that
are not the result of defective workman-ship or materials in this appliance.
Solution
Air conditioner
does not start
Wall plug disconnected. Push plug firmly into wall outlet.
House fuse blown or circuit breaker tripped. Replace fuse with time delay type or reset circuit breaker.
Selector Control in OFF position. Turn selector to the desired FAN or COOL setting.
Problem
Air from unit does
not feel cold
enough
Thermostat set too warm. Set thermostat to colder temperature.
Turn selector to a higher COOL position.
Room temperature below 18 C(64 F). Cooling may not occur until room temperature
rises above 18 C(64 F).
Temperature sensing tube touching cold coil, located behind air filter. Straighten tube away from coil.
Unit turned off by moving thermostat to a higher number and then immediately turning back to a
colder number. Wait approximately 3 minutes. Listen for compressor to start.
Unit turned off and then on too quickly. Turn unit off and wait 3 minutes before restarting.
Thermostat set too low. Adjust thermostat to higher number for cooling.
OO
O
O
Thermostat set too cold for night-time cooling. To defrost the coil, set selector to a
FAN position. Then, set thermostat to a warmer position.
Air filter may be dirty. Clean filter. Refer to Care and Cleaning section. To defrost, set selector to FAN.
Air conditioner
cooling, but room
is too warm- ice
forming on cooling
coil behind
decorative front.
Outdoor temperature below 18 C(64 F). To defrost the coil, set selector to FAN position. Then,
set thermostat to warmer position.
OO
Air conditioner
turns on and
off rapidly
Noise when unit is
cooling
Water dripping
INSIDE when
unit is cooling.
Improper installation. Tilt air conditioner slightly to the outside to allow water drainage. Refer to
installation instructions - check with installer.
Dirty air filter- air restricted. Clean air filter.
Air movement sound. This is normal . If too loud, turn selector to lower FAN setting.
Outside temperature extremely hot. Set to high cool to bring air past cooling coils more frequently.
Sound of fan hitting water-moisture removal system. This is normal when humidity is high.
Close doors, windows and registers.
Window vibration - poor installation. Refer to installation instructions or check with installer.
Water dripping
OUTSIDE when
unit is cooling.
Unit removing large quantity of moisture from humid room. This is normal during excessively
humid days.
Dirty air filter- air restricted. Clean air filter. Refer to Care and Cleaning section.
Unit recently turned on in hot room. Allow additional time to remove Stored heat from
walls, ceiling, floor and furniture.
Air conditioner
cooling, but room
is too warm- NO
ice forming on
cooling coil behind
decorative front.
Thermostat set too warm. Turn thermostat clockwise to a colder setting.
Air directional louvers positioned improperly. Position louvers for better air distribution.
Front of units is blocked by drapes, blinds, furniture, etc. - restricts air distribution.
Clear blockage in front of unit.
Doors, windows, registers, etc. Open- cold air escapes. Close doors, windows, registers.