Applied Comfort VI20HA09K36E7PA30 Service manual

VERTICAL TERMINAL
AIR CONDITIONER/HEAT PUMP
INSTALLATION INSTRUCTIONS & OWNER'S MANUAL
As a professional installer you have an obligation to know the product better than the customer. This includes all
safety precautions and related items.
Prior to actual installation, thoroughly familiarize yourself with this instruction manual. Pay special attention to all safety
warnings.
Often during installation or repair it is possible to place yourself in a position which is more hazardous than when the unit
is in operation.
Remember it is your responsibility to install the product safely and to know it well enough to be able to instruct a customer
in its safe use.
Safety is a matter of common sense, a matter of thinking before acting. Most dealers have a list of specific good safety
practices, follow them.
The precautions listed in this Installation Manual are intended as supplemental to existing practices. However, if there a is
direct conflict between existing practices and the content of this manual, the precautions listed here take precedence.
ATTENTION INSTALLATION PROFESSIONAL
VI20HA09K36E7PA30
VI20HA12K36E7PA30
VI20HA15K50E8PA30
VI20HA09K25E6PA30
VI20HA12K50E8PA30
VI20HA15K36E7PA30
MODELS SERIES

CONTENTS
OPERATION INSTRUCTIONS 2……………………
CARE AND CLEANING 3… …………………………
INSTALLATION INSTRUCTIONS 4…………………
ERROR CODE AND SOLUTION…………………16
N O R M A L O P E R AT I N G S O U N D S A N D
CONDITION 16 …………………………………………
TROUBLESHOOTING TIPS……………… ………17
-1-
WARNING
1.This unit must be properly installed in
accordance with the Installation Instructions
before it is used.
See the Installation Instructions in the back of
this manual.
2.Replace immediately all electric service cords
that have become frayed or otherwise damaged.
A damaged power supply cord must be replaced
with a new power supply cord obtained from the
manufacturer and not repaired. Do not use a
cord that shows cracks or abrasion damage
along its length or at either the plug or connector
end.
3.Product must be operated with the electrical
plug supplied with the product. Do not replace
the electrical plug supplied with the product.
4.If the receptacle does not match the plug, the
receptacle must be changed out by a qualified
electrician.
5.Unplug or disconnect the unit at the fuse box or
circuit breaker before making any repairs.
NOTE: We strongly recommend that any
servicing be performed by a qualified individual.
6.All air conditioners contain refrigerants which
under federal law must be removed prior to
product disposal. If you are getting rid of an old
product with refrigerants, check with the
company handling disposal about what to do.
7.These R410A Air Conditioner Systems require
contractors and technicians to use tools,
equipment and safety standards approved for
use with this refrigerant. Do not use equipment
certified for R22 refrigerant only.
RECOGNIZE THIS SYMBOL AS
A SAFETY PRECAUTION
WARNING
HIGH VOLTAGE
Disconnect all power before servicing or installing
this unit. Multiple power sources may be present,
failure to do so may cause property damage, personal
injury or death.
The manufacturer will not be responsible for any injury or
property, damage arising from improper service or service
procedures. If you install or perform service on this unit, you
assume responsibility for any personal injury or property
damage which may result. Many jurisdictions
require a license to install or service heating and air
conditioning equipment.
WARNING
WARNING
Risk of electric shock can cause injury or death. For
your safety, the information in this manual must be followed
to minimize the risk of fire, electric shock or personal injury.
The following warnings are very important
for safety. Please read them carefully
before installation!

-2-
OPERATION INSTRUCTION
Controls-terminal connections
side
shipping
screws
side
shipping
screws
R FD GH B Y W GL C
Orange-Low fan speed
Red-24VAC
Front Desk Control
Green-High fan speed
Blue-Reversing valve
Yellow-Compressor
White-Heater
Black-Common ground
ON/OFF switches
ON/OFF
Switch
six
terminals
are still HOT and must not be touched.
servicing.

-3-
Turn off the Unit and disconnect the power supply before cleaning
Remove filter
Filter
Return air grille
with filter holder
Filter
Access-panel with
return air grille and filter holder
outdoor coil
Have the coils been cleaned regularly?
Drain
Clean the drain system regularly to prevent
clogging.
Air Filters
To maintain optimum performance, change the
filter at least every 30 days. The most important
thing you can do to maintain the unit is to change
the filter at least every 30 days. Dirty filters reduce
cooling, heating and air flow.
Changing the filter will:
Decrease cost of operation, save energy, prevent
clogged heat exchanger coils and reduce the risk
of premature component failure.
The coils on the unit should be checked
regularly. If they are clogged with dirt or soot,
they may be professionally cleaned.You will
need to remove the unit from the case to
inspect the coils because the dirt build-up
occurs on the coil face that first contacts the
debris.
Operating without the filter in place or with a
damaged filter will allow dirt and dust to reach
the indoor coil and reduce the cooling,heating
airflow and efficiency of the unit.
Replacement filters should be purchased from
your local retailer where air conditioner and
furnace accessories are sold.
Filter size required is 20"x 20"x1",except for
Access-panel with return air grille and filter
holder which requires a 24″×30″×1″ size.
To remove
and replace
the filter:
Unit-mounted filter

-4-
INSTALLATION INSTRUCTION
BEFORE YOU BEGIN
Read these instructions completely and carefully.
This air conditioner is not meant to provide
unattended cooling or life support for persons
or animals who are unable to react to the
failure of the product.
The failur unattended air conditioner e of an
may result in extreme heat in the conditioned
space causing overheating or death of
persons or animals.
RISK OF ELECTRIC SHOCK.
All electrical connections and w i r i n g MUST
be installed by a qualified electrician.
Follow the National Electrical Code (NEC), the
Canadian Electrical Code (CEC) , a n d / o r
local codes and ordinances, as applicable.
For personal safety, this unit and case must be
properly grounded.
Protective devices (fuses or circuit breakers)
acceptable for unit installations are specified
on the nameplate of each unit.
Do not use an extension cord with this unit.
Aluminum building wiring may
present special problems - consult a qualified
electrician.
When the unit is not running there is still voltage
to the electrical controls.
Disconnect the power to the unit before
servicing by:
1. Removing the power cord from the wall
receptacle if unit has a cord.
OR
2. Removing the branch circuit fuses or turning
the circuit breakers off at the panel.

INSTALLATION INSTRUCTION
Electrical Requirement
WARNING
To avoid the risk of property damage,
personal injury or fire, use only copper
conductors.
To avoid property damage, personal injury
or death due to electrical shock, do not use
an extension cord with this unit.
WARNING
To avoid the risk of property damage,
personal injury or fire do not install with
power cord stretched or under a strain as
this may create loose plug/receptacle
connection.
WARNING
To avoid the risk of personal injury, wiring
to the unit must be properly polarized and
grounded.
WARNING
-5-
WARNING
HIGH VOLTAGE
Disconnect all power before servicing or
installing this unit multiple power sources
be present , failure to do so may cause
property damage , personal injury or death.
Do not service this unit without first
shutting off the power to the unit form the
circuit breaker and/or removing the unit
cord set plug from the wall outlet.
The power cord is located inside the electrical
control box cover for insert mounting.
LCDI Power cord
All wiring , including installation of the receptacle,
must be in accordance with the NEC, CEC and local
codes ordinances and regulations , as applicable.
LCDI power Cord
Unit Voltage
Rating Minimum Maximum
230/208 187 253
265 238 292
Operating Voltage
Voltage Utilization Range
230/208V 15Amp Perpendicular
230/208V 20 Amp Large tandem
230/208V 30Amp
WARNING
To avoid the risk of property damage, personal injury
or death due to fire, ensure that the Case, Unit, and
Front Case Panel are replaced as a complete assembly
in a retrofit/ replacement situation. Do not under any
circumstances insert this Unit into an existing
competitor case. For example, some existing cases
may contain plastics that are incompatible with this
unit from a safety standpoint.
• LCDI Cords(230/208V models only)-
Underwriters Laboratories and the National Electric
Code (NEC) now require power cords that sense
current leakage and can open the electrical circuit to
the unit on units rated at 250 volts or less. In the event
that unit does not operate, check the reset button
located on or near the head of the power cord as part
of the normal troubleshooting procedure.
•Cord connection to a wall socket is not permitted
for 265V units. All 265V units must be hard wired
using the hard wire kit.

-6-
Unit Component
Case
Unit
Front Case Panel
Required Accessories
(Check the"Essential Elements"label on the unit.)
Architectural Louver
Access Panel with
Return Air Grille
with filter holder
Cutout
Dimensions:
30"5/16Wx 48"5/16H
33"
51" Return Air Grille
with filter holder
Cutout
Dimensions:
20"5/16Wx 20"5/16H
22-7/8"
22-7/8"
Cutout Dimensions:
20-5/16" W x 32 -5/16"H
Wall Plenum
6"D x 20"W x 32"H
8"D x 20"W x 32"H
12"D x 20"W x 32"H
15"D x 20"W x 32"H

-7-
~2-1/4" ~1"
11-1/2"
10" 10"
duct
3"min.
3"
min. Electrical connection
4" min.
Door/access panel
Thermostat
Connection
Unit
front
Architectural Louver
UNIT INSTALLED THROUGH
SIDE OF CASE
Top View
~2-1/4" ~1"
11-1/2"
10" 10"
duct
5"min.
3"
min. Electrical connection
5" min.
Architectural Louver
Door/access panel
Thermostat
Connection Unit
front
A
B
A Minimum recommended access door width: 30"
B Minimum recommended access door height : 50"
Option 2
Return air grille
Inside wall
Option 1
Access panel
with return air grille
Rigid
ductwork
metal duct
Air discharge
outlet
Unit
Wall
plenum
Wall plenum
divider
Drain fittings 3/4"
Filter bracket
Secure platform
to the floor
8"min.
for drain
access
Platform: 23-1/4"x 23-1/4"square Min.
load capacity:175 Ibs.
Outside wall
Plenum
cutout
32-5/16"H
x 20-5/16"W
Exterior/Outside
Bottom of case approx.2"
above bottom of plenum
Wall plenum
Bottom of case approx 2”
above bottom of plenum
Platform
Outside wall
Field supplied
outer flashing
•4" min. from front of case - Unit
installed through FRONT of case.
•5" min. from front of case - Unit
installed through SIDE of case.
•3" min. from two sides of case.
(5"for side install).
31"
2" min
10" max
1/4 " BEYOND
FLASHING

Utility Closet Connection Locations
-8-
IMPORTANT: Plan and locate plenum, wall plug, drains and thermostat carefully to avoid
interference Hard-to-reach locations will make installation and service difficult!
Reference Dimensions
A Thermostat cable
B Power cord: 60" long if 230VAC or
conduit entrance if 265VAC.
C Case width and depth: 23-1/8"
D Case height: 31"
E Condensate drains: 3/4"connector
• Primary Drain - Centerline of
cutout is approximately 5-1/4"
from left case wall and 8-1/2" from
back case wall.
• Secondary Drain-centerline of
cutout is approximately 6-1/2"
from left case wall and 5-1/4" from
back case wall.
F Typical wall plug: 6"-12" above case
G 40" min.
Air outlet
Flex duct may be used
for transitions only
Use rigid duct for
90° bends and tees
Outside wall
A
B
CC
D
E
230/208VAC
Wall receptacle for cord and
plug connection as applicable
Platform
F
G
Connecting the
air outlet
Connecting the
air outlet
WARNING
WARNING
Supply duct is intended to distribute
conditioned air throughout a single
unit on one floor only. Unit space may
be partitioned into rooms within the
same unit, but supply air is not to be
delivered to any other unit.
Provide adequate return air paths for
rooms by established means. Do not
attach a return air duct to the chassis
or outer case.

Return Air Grille Installation Options
The room return air grille may be installed toward the front or either side of the unit.
Improper return air arrangements will cause performance problems.
There are three indoor return air grille installation options. Choose the option that best
suits your installation requirements. Follow the Installation Instructions provided with the
return air grille accessory for installation details.
NOTE: Use only one filter in the installation. The filter may be installed on the unit or in
the access panel/door.
Outside wall
Access panel with return air grille
Filter
Option 1
Return air grille
Filter
Option 2
Unit-mounted filter with a field-supplied return
air grille and access door/panel
Filter
Option 3
-9-

-10-
Wall Plenum And Architectural Louver Installation
Since the unit itself does not install in the wall opening, the use of a plenum is necessary to
contain and separate the outdoor air paths. The plenum must be able to hold water in the
bottom without leaking into the wall cavity. It also must have a “splitter” to separate the outdoor
air paths and prevent the discharge air from being drawn back into the unit.
The wall plenum is the first component to be installed. The wall opening location for the
plenum needs to extend 1” below the top of the installation platform. Since the platform must
be a minimum of 8” off the floor, the cutout for the plenum must be a minimum of 7” off the
interior finished floor. Four sizes of plenums are available,
and the choice of the correct plenum is determined by the thickness of the building exterior
wall. Each of the plenums is 20”W x 32”H and requires a 20-5/16”W x 32-5/16”H cutout in the
wall.
The plenum is to be installed square and level in the opening or up to 1/4 bubble tilt to outside;
pitch to outside should be similar to that planned for the sleeve) and secured to the wall
construction with screws or nails in the sides located a minimum of 2” from the bottom of the
plenum. No nails or screws may be used in the bottom or top of the plenum to prevent water
entering the wall cavity.
The plenum is not load bearing, so a proper header needs to be installed above the plenum
the same as over any window opening in the wall. If the building construction is brick, concrete
block or other non self-supporting material, a lintel must be installed over the plenum opening.
The plenum must be caulked to the wall, both to outdoor wall face and to the interior wall, along
all four sides to prevent air and water infiltration. The installation of flashing, with a 45°drip lip, is
recommended under the plenum.
Architectural Louver
Proper header for
structural support
Apply proper caulking
and flashing
Exterior/Outside Wall
Properly square
and level plenum.
Case
Wall Plenum
6"D x 20"W x 32"H
8"D x 20"W x 32"H
12"D x 20"W x 32"H
15"D x 20"W x 32"H

-11-
(2)Install The Drain(s)
An external or an internal drain must be attached
to the primary drain connector. A secondary drain
is supplied if required by state and local codes.
Refer to the local codes for proper installation of
the drains. If the secondary drain is not used, seal
its drain port with a 3/4"MNPT plug.
External Drain
Attach a 90° PVC elbow to the units female 3/4"NPT
drain connector. Use the other end of the elbow to
run a 3/4 " Sch. 40 PVC pipe through the knockout
holes of both the wall plenum and the architectural
louver to the outside Seal the gap between the
plenum hole and PVC tube. See the installation
instructions in the figure 1.
Side View
Inside wall
Female drain
fitting 3/4"
PVC
(Internal drain)
Internal Drain
Attach PVC to the units female 3/4"NPT drain
connector. See the Installation Instructions in the
figure 2 Local codes may apply.
figure 1
figure 2
Left side of platform
23-1/4 "min.
8" min
for
drain
access
NOTE: Specific cutout size
for drain connections needs
to be determined by the installer
for the given installation situation.
23-1/4 "min.
Back of platform
Cutout for drain
Connection(s)
(see NOTE below)
5-1/4"
5-1/4"
6-1/2"
8-1/2"
Side View
Inside wall
Female drain
fitting 3/4” PVC
(External drain)
PVC
90° Elbow

-12-
(3)Ductwork
Prepare the closet ductwork for later connection
to the case.
The total flow rate(CFM) and external static
pressure (ESP) available can be estimated from
the chart below.
The collar on top of the case accepts standard
10"duct.Pull all duct tight. Extra duct slack can
greatly increase Static pressure.
NOTICE: Flex duct can collapse and cause
airflow restrictions. Do not use flex duct for 90°
bends or unsupported runs of 5 ft. or more.
Your airflow should be balanced based on many
factors such as available ESP room CFM. and
ductwork. Consult an HVAC engineer for proper
applications. External static pressure ( ESP )
can be measured with a manometer or pitot
tube. Once this ESP is established you can
calculate the CFM use above char
(4)Install And Connect The Case
1. Remove the front case panel and pull the unit
out of the case. Place the empty case onto the
platform in the closet with the outdoor side facing
the wall plenum opening. Align the case with
plenum opening and attach.
High
CFM
Medium
CFM
Medium
CFM
Low
CFM
0.00 550 425 425 410
0.04 515 395 395 375
0.10 465 350 350 320
0.15 440 300 300 270
0.20 405 240 240 205
0.25 365 180 180 120
0.30 310 - - -
0.00 550 475 475 410
0.04 515 440 440 375
0.10 465 390 390 320
0.15 440 355 355 270
0.20 405 300 300 205
0.25 365 235 235 120
0.30 310 180 180 -
0.00 - - 550 475
0.04 - - 515 440
0.10 - - 465 390
0.15 - - 440 355
0.20 - - 405 300
0.25 - - 365 235
0.30 - - 310 180
OFF
15K
Airflow -CFM
ESP
(in.water)
09K
12K
Indoor Fan CFM
Duct Select Switch
ON
Inside
wall metal duct
Air
discharge
outlet
Leveling legs
3. Using field-supplied screws, bolt the case to the
platform.
4.
2.
Primary female
drain fitting 3/4”
Bolt case
to platform
External
drain
OR
Internal
Drain(s)
NOTE: Piping is not
supplied with the unit.
Obtain locally.

-13-
(5a)Install And Ground The Unit To
The Case Unit Installed Through
Front Of Case
1. Slide the back of the unit into the case. Push the
unit all of the way into the case until it stops.
NOTE: Either of the case sides may be
removed to enable the unit to be
slid into the case.
2. Ground the unit to the case by installing the front
case-to-unit .paint-scraping screws
(5b) Install And Ground The Unit To
The Case Unit Installed Through
Side Of Case
Inside
wall
metal duct
Air
discharge
outlet
(6)Connect The Top Duct
1. Install the duct onto the air discharge outlet.
2. Secure the top duct to the unit by turning the
four case top duct adjusting screws clockwise
until they are tight.
Use a field supplied clamp to lock the top duct
to the case.
(7)Final Check
Review this Checklist before restoring power.
•Correct line voltage?
•Single circuit only?
•Ductwork connected?
•Case and wallplenum leveled to specification?
•Wall plenum caulked? Flashing?
•Drain connected?
•Unit wired correctly?
(8)Connect Power
1. If all the above items are correct, turn the power
on at the main service panel.
2. Turn the unit power switch, on the front of the
unit.
side screws
paint-scraping
screws
side screws
(may be installed
on either side)
paint-scraping
screws
paint-scraping screws
Case top
duct adjusting
screws
metal duct
Clamp

-14-
SERVICING
Control Configuration-For use by qualified service personnel only
The adjustable control switches are located at the PCB.The inputs are only visible and accessible
with the electric control box removed from the unit.
side screws
side screws
PCB in the electric
control case
1 2 3
SW2
1 2
SW3
1 2 3456 7 8
SW1
PCB
1 2 3
SW2
1 2
SW3
1 2 3456 7 8
SW1
off
on
Before servicing, switch power off at the
service panel and lock the area to prevent
power from being switched on accidentally.
When the area cannot be locked securely
fasten a prominent warning device, such
as a tag to the service panel.
WARNING
NOTE: We strongly recommend that any
servicing be performed by a qualified
individual.
For ease of service. the unit can be
removed from the case:
1. Remove the front case panel.
2. Unplug the power cord.
3. Raise the top duct by turning all four
case top duct adjusting screws
counterclockwise.
4. Remove the case-to unit grounding
screws.
5. Slide the unit out of the case.
unit, multiple

Switch Setting
1、Switch 1
1 2 3456 7 8
Cooling fan
Heating fan
Electric memory
Freeze protect
Reserved
Electric heater
Heat pump
Reserved
SW1.1—Reserved.
SW1.2—Heat pump enable/disable.
It must match specific unit-type configuration ,do not change the
default setting.
SW1.3—Electric heater.
It must match specific unit-type configuration,do not change the
default setting.
SW1.4—Reserved.
SW1.5—Freeze protect.
When room temperature is lower than 10℃(50℉) continuously
for 3 minutes, unit (except the cooling only type) will start heating
automatically. Only when room temperature reaches 13℃(55℉)
will heating be stopped. If this switch is put to OFF position, it will
be no freeze protection.
SW1.6—Electric memory.
If the unit is cut out of power during the operation, when it is
powered up again, all last settings will be remembered, and the
operation will follow the last mode. Same result if manually
powering on the unit. If this switch is put to OFF position, it will
be no memory.
SW1.7—Heating fan(No effect for 24VAC Thermostat Operation).
Default setting is OFF(indoor fan cycles on and off). In heating
mode when compressor is OFF, indoor fan will be OFF too.
If this this switch is put to ON position, even compressor is OFF,
indoor fan will continuously running.
SW1.8—Cooling fan(No effect for 24VAC Thermostat Operation).
Default setting is OFF(indoor fan runs continuously). In cooling
mode when compressor is OFF, indoor fan will continuously run.
If this switch is put to ON position, when compressor is OFF,
indoor fan will be OFF .
-15-
2、Switch 3
1 2
Powered vent door
Duct select
SW3.1—Powered vent door
If this switch is put to OFF position , the powered vent
door will be closed, always.
If this switch is put to ON position , the powered vent
door will be normally closed and will open only when
the compressor runs.
SW3.2—Duct select(For 9k/12k)
SW3.1 is set to “OFF”
Powered vent door is close
SW3.1 is set to “ON”
Powered vent door is open
SW3.1—Powered vent door
SW3.2—Duct select(For 9k/12k)
The duct select function allows the indoor fan to be
operated at two variable fan speeds.
When set in the up position(ON), the unit automatically
selects either high or middle fan speed ( for longer
ductwork applications).
When set in the down position(OFF), the unit
automatically selects either middle or low fan speed
(for shorter ductwork applications).
Most installations will have their established means to
ensure adequate fresh air supply to the building.
However, a powered vent door has been provided to
open up an outdoor/indoor air path within the unit, if
desired. There is a mesh screen present for when the
unit is operated with the vent door open. A vent air flow
rate will not be published as it varies based on too many
operational and situational influences. Also be aware
that outdoor noises will travel more easily into the indoor
space when the vent door is open.

Meaning SolutionsError Code
Communication failure between
indoor unit and outdoor unit.
E1 Check the communication cables; make sure they are firmly
connected. If the cables are broken, replace them.
Indoor Temp Sensor Open/short.
E2 Check the plug is firmly connected. If the sensor is broken,
replace it.
Indoor Coil Sensor Open/short
E3 Check the plug is firmly connected. If the sensor is broken,
replace it.
Outdoor Temp Sensor Open/Short
E4 Check the plug is firmly connected. If the sensor is broken,
replace it.
Outdoor Coil Sensor Open/Short
E6 Check the plug is firmly connected. If the sensor is broken,
replace it.
EEPROM Error
E7 Check the EEPROM chip on the main board is firmly plugged.
If still not solved, replace the main board.
Communication failure between
main board and 12V controller
E9 Check the communication plug, make sure the wire
connections are OK.
Compressor Fail
Starting/DC-Inverter Fail
Ed
1. Check the DIP switch SW2 on the main board (3-position,
in red color) is correctly matched with the unit capacity, refer to
the wiring diagram.Make sure the compressor power cord is
firmly and correctly connected.
DC Over/Under Voltage Protection
P1 Make sure the power supply is within the requirement
(AC208/230V -10%+10%)
IPM Over Heat Or Over Current
Protection
P3
1. Ensure that the indoor and outdoor air outlets are not blocked.
2. Check the DIP switch SW2 on the main board (3-position,
in red color) is correctly match with the unit capacity, refer to
the wiring diagram.
3. Make sure the compressor power cord is firmly and correctly
connected.
Compressor Discharge Over Heat
Protection
P4
1. Make sure indoor and outdoor unit vents are not blocked.
2. Check the DIP switch SW2 on the main board (3-position,
in red color)is correctly match with the unit capacity, refer to
the wiring diagram.
Cooling/Heat Pump Over Load,
Outdoor/Indoor Coil Over Heat
P5 Ensure that the indoor and outdoor air outlets are not blocked.
Check if the indoor filter, indoor coil or outdoor coil need cleaning.
IPM(DC-INVERTER) Protection
(Include Heat sink Over Heat)
P6
1. Check the wiring of compressor to the IPM (U/V/W) terminals
is correctly connected. Wrong phase connection is not allowed.
2. Remove obstacles in the air path that resists heat interchange.
Error code and solutions(error codes illuminated in display)
NORMAL OPERATING SOUNDS AND CONDITIONS
Water trickling sounds
Water is picked up and distributed over the coil.
This improves the efficiency and helps with water
removal.
Water dripping
Water will collect in the base pan during high
humidity days . This can cause overflow and drip
from the outside of the unit.
Air sounds
The fan cycle switch sets the operational mode
of the fan . In the ON position the fan will run
continuously whenever power is applied in this
mode . In the AUTO position, the fan will cycle
on and off with the compressor or electric heater.
Starting delay
You may notice a few minutes delay in the
starting if you try to restart the unit too soon after
turning it off or if you adjust the thermostat right
after the compressor has shut off .This is due to
a built– in delay to protect the compressor.
Buzzer Response
The buzzer will chime Di”(0.1 sec)as response
when receiving the effective order from key pad
control and remote control.
-16-

TROUBLESHOOTING
-17-
POSSIBLE CAUSES
UNIT DOES NOT START
●Unit may have become unplugged
●Fuse may have blown
●Circuit breaker may have been tripped
●Unit may be off at wall thermostat.
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Unit may be in a protection or diagnostic failure
mode. See section on diagnostic codes.
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DISPLAY HAS STRANGE NUMBERS/CHARACTERS
ON IT
UNIT MAKING NOISES
UNIT NOT COOLING / HEATING ROOM
Unit air discharge section is blocked
Temperature setting is not high or low enough
Note: Setpoint limits may not allow the unit to heat or
cool the room to the temperature desired. Check section
on temperature limiting in wall thermostat manual.
Unit air filters are dirty.
Room is excessively hot or cold when unit is started
Vent door open
Unit may be in a protection or diagnostic failure mode.
WATER DRIPPING OUTSIDE
WATER DRIPPING INSIDE
Wa not installed levelll plenum is
ICE OR FROST FORMS ON INDOOR COIL
Low outdoor temperature
Dirt rsy air filte
COMPRESSOR PROTECTION
Compressor operation may have been interrupted,
so compressor is in a restart delay.
SOLUTIONS
Check that plug is plugged securely in wall receptacle.
Note :Plug has a test/reset button on it. Make sure that the
plug has not tripped.
Replace the fuse.
Reset circuit breaker.
Turn unit on to heating or cooling mode wallat
The unit may be in a diagnostic condition. Check
--- checking Control section to determine
if unit has had a failure.
The unit may be set for ° C (instead of ° F), see the keypad
configuration section
Clicking, gurgling and whooshing noises are normal during
operation of unit.
Make sure that curtains, blinds or furniture are not restricting or
blocking unit airflow.
Reset to a lower or higher temperature setting.
Remove and clean filters.
Start heating or cooling early before outdoor temperature, cooking
heat or gatherings of people make room uncomfortable.
Close vent door.
Check section on diagnostic codes.
Wait approximately 3 minutes for compressor to start
If d, condensation an internal drain system has not been installe
run off to the outdoors during very hot and humid weather is
normal. The external drain tube will discharge the condensate out
beyond the real louver.
Wall ust be installed for proper drainage ofplenum m
condensation. Check that installation is properly leveled according
to installation instructions and make any necessary adjustments.
Random Compressor restart—Whenever the unit is
plugged in, or power has been restored a random
compressor restart will occur. After a power outage, the
compressor will restart after approximately 3 minutes.
Compressor Protection — To prevent short cycling of the
compressor, there is a random startup delay of 3 minutes.
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diagnostic codes
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Remove then clean or replace air filters as applicable.
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thermostat system switch.
Compressor is in time delay. There is a protective time delay
(approx . 3 minutes) on starting the compressor after a power
outage (or restarting after it has been turned off ), to prevent
tripping of the compress or overload.

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Applied Comfort Products Inc.
1210 Bal moral Road, Cambridge, Ontario, Canada, N 1T 1 AS