Tosot WAT Series User manual

WINDOW AIR CONDITIONER
WAT Series
OWNER’S MANUAL
OPERATOR’S MANUAL
TECHNICAL MANUAL
For model:
GJC10BL-A6NRNC5H
Please read this owner’s manual carefully
before operating the unit and keep it for future reference.
V2021-11
IMPORTANT : The remote control and hardware necessary to use your new product
is included inside the box. You will find them inserted in the Styrofoam included
in the box.

2
TABLE OF CONTENTS
Operation Notices.....................................................................................................................3
Symbols meanings....................................................................................................................................................3
Exception Clauses .....................................................................................................................................................4
The Refrigerant...........................................................................................................................................................5
Refrigerant Safety Precautions............................................................................................................................. 6
General Safety Precautions....................................................................................................................................7
General Instructions for Use................................................................................................................................10
Installation .............................................................................................................................12
Parts Name.................................................................................................................................................................12
Preparation for Installation..................................................................................................................................13
Installation Procedure............................................................................................................................................14
Control.....................................................................................................................................19
Remote Control........................................................................................................................................................19
Electronic Thermostat............................................................................................................................................22
Air Conditioner Use ................................................................................................................23
Instructions for fan direction adjusting...........................................................................................................23
Normal sounds.........................................................................................................................................................24
Maintenance ...........................................................................................................................24
Cleaning and Maintenance..................................................................................................................................24
Maintenance Security Precautions ...................................................................................................................26
Additional Information for Maintenance........................................................................................................27
Malfunction Analysis..............................................................................................................32
Assistance................................................................................................................................35

3
OPERATION NOTICES
READ THIS MANUAL: 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 common 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.
Note: Graphics in this manual are only for reference. Please refer to actual products for specific
details.
This appliance is not intended for use by people (including children) with reduced physical,
sensory or mental capabilities, or lack of experience and knowledge, unless they have been given
supervision or instruction concerning use of the appliance by a person responsible for their safety.
Children should be supervised to ensure that they do not play with the appliance.
CAUTION:
• Contact the authorized service technician for repair or maintenance of this unit.
• Contact the installer for installation of this unit.
• If the SUPPLY CORD is damaged, it must be replaced by the manufacturer, its service agent or
similarly qualified people to avoid a hazard.
• Installation work must be performed in accordance with the national wiring standards and by
authorized personnel only.
Symbols Meanings
Indicates a risk of fire, caution.
Indicates that before using the appliance, you must read the owner’s manual.
Indicates that before installing the appliance, you must read the installation manual.
Indicates that before repairing the appliance, you must read the service manual.
General Warnings:
Indicates NEVER DO THIS.
Indicates ALWAYS DO THIS.

4
Indicated harzardeous situation that, if not avoided,
will result in death or serious injury.
Indicated harzardeous situation that, if not avoided,
could result in death or serious injury.
Indicated harzardeous situation that, if not avoided, may result
in minor or moderate injury.
Indicates important but not hazard-related information,
used to indicate risk of property damage.
Indicates a hazard that would be assigned the mention of
WARNING or CAUTION.
DANGER
WARNING
CAUTION
NOTICE
Exception Clauses
Manufacturer will bear no responsibilities when personal injury or property loss is caused by the
following reasons.
1. Damage to the product due to improper use or misuse of the product;
2. Alter, change, maintain or use of the product with other equipment without abiding to the
instruction manual of manufacturer;
3. After verification, the defect of product is directly caused by corrosive gas;
4. After verification, defects are due to improper operation during transportation of product;
5. Operate, repair, maintain the unit without abiding to instruction manual or related regulations;
6. After verification, the problem or defect is caused by the quality specification or performance
of parts and components that are produced by other manufacturers;
7. The damage is caused by natural calamities or used in a bad environment.
Safety Warnings:

5
The Refrigerant
To have a functional air conditioning unit, a special refrigerant circulates in the system. The
used refrigerant is the fluoride R32, which is specially cleaned. The refrigerant is flammable and
inodorous. Furthermore, it can lead to explosion under certain conditions. But the flammability
of the refrigerant is very low. It can be ignited only by fire.
Compared to common refrigerants, R32 is a nonpolluting refrigerant with no harm to the
ozonosphere. The greenhouse emissions are also lower. R32 has very good thermodynamic
features which leads to a high energy efficiency. The unit therefore needs less filling.
DANGER
WARNING
CAUTION
NOTICE
• Keep ventilation openings clear of obstruction.
• Do not use means to accelerate the defrosting process or to clean, other than those recom-
mended by the manufacturer.
• Should repair be necessary, contact a qualified technician. Any repairs carried out by unquali-
fied personnel may be dangerous.
• For repairs, strictly follow manufacturer’s instructions only.
• Appliance shall be installed, operated and stored in a room with a floor area larger than the
recommended area (Please refer to table“1” in section of “Refrigerant Safety Precautions”).
• The appliance shall be stored in a room without continuously operating ignition sources (for
example: open flames, an operating gas appliance or an operating electric heater).
• Do not pierce or burn the unit.
• Appliance is filled with flammable gas R32.
• Be aware that refrigerants do not contain odor.
• When maintaining or disposing the unit, the refrigerant inside the system must be eliminated.
Refrigerant should be recovered. It can’t be discharged freely.
• No open fire (fired equipment such as electrical heater and gas stove etc.) or any equipment
(e.g. switch) that might generate arc should be around the appliance.
NOTE: Anyone who is involved with working on or breaking into a refrigerant circuit should hold
a current valid certificate from an industry-accredited assessment authority, which authorizes
their competence to handle refrigerants safely in accordance with an industry recognized assess-
ment specification. Servicing shall only be performed as recommended by the equipment manu-
facturer. Maintenance and repair requiring the assistance of skilled personnel shall be carried out
under the supervision of the person competent to use flammable refrigerants.

6
Refrigerant Safety Precaution
Qualification requirement for installation and maintenance
Everyone who is working with a refrigeration system should bear the valid certification awarded
by the authorized organization and the qualification for dealing with the refrigeration system
recognized by this industry.
Installation reminders
• The air conditioner cannot be installed in a room that has running fire or such fire source.
• The air conditioner must be installed in a room that is larger than the minimum room area.
(See Table 1 below).
• Leak test is a must after installation.
Table 1: Minimum room area (m2)
Charge amount
(kg) ≤1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5
Floor location / 14.5 16.8 19.3 22.0 24.8 27.8 31.0 34.3 37.8 41.5 45.4 49.4 53.6
Window
mounted / 5.2 6.1 7.0 7.9 8.9 10.0 11.2 12.4 13.6 15.0 16.3 17.8 19.3
Wall mounted / 1.6 1.9 2.1 2.4 2.8 3.1 3.4 3.8 4.2 4.6 5.0 5.5 6.0
Ceiling
mounted / 1.1 1.3 1.4 1.6 1.8 2.1 2.3 2.6 2.8 3.1 3.4 3.7 4.0
Welding Instructions - Must be done by a qualified technician
If you should cut or weld the refrigerant system pipes during maintenance, please follow the
steps below:
1. Shut down the unit and cut power supply.
2. Eliminate the refrigerant.
3. Vacuum.
4. Clean it with N2 gas.
5. Cut or weld.
6. Carry back to the service spot for welding.
NOTE: The refrigerant should be recycled into a specialized storage tank.
WARNING: Make sure there isn’t any naked flame near the outlet of the vacuum pump
and that is well-ventilated.

7
Instructions to fill the Refrigerant- Must be done by a qualified technician
1. Use the refrigerant filling appliances specialized for R32. Make sure that different kinds
of refrigerant won’t contaminate with each other.
2. The refrigerant tank should be kept upright at the time of filing refrigerant.
3. Stick the label on the system after filling is finished.
4. Don’t overfill.
5. After filling is finished, please do the leakage detection test before using the unit.
General Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions
must be followed. Incorrect operation may cause harm or damage.
Plug in power plug properly. Otherwise, it may cause electric shock or fire due to excess heat
generation.
Always ensure effective grounding. Incorrect grounding may cause electric shock.
Unplug the unit if strange sounds, smell or smoke comes from it.
Keep firearms away. It may cause fire.
Ventilate room before operating air conditioner if there is a gas leakage from another appli-
ance. It may cause explosion, fire and burns.
Always install circuit breaker and a dedicated power circuit. Incorrect installation may cause
fire and electric shock.
Ensure that the installation bracket of the outdoor appliance is not damaged due to prolonged
exposure.
Ventilate the room well when used together with a stove, as an oxygen shortage may occur.
When the unit is to be cleaned, switch off and turn off the circuit breaker.
Stop operation and close the window in a storm or hurricane.
Turn off the main power switch when not using the unit for a long time. It may cause failure of
product or fire.
Always insert the filters securely. Clean the filter once every two weeks. Operation without
filters may cause failure.
Use a soft cloth to clean the unit.
If water enters the unit, turn the unit off at the power outlet and switch off the circuit breaker.
Isolate supply by taking the power plug out and contact a QUALIFIED SERVICE TECHNICIAN.
Use caution when unpacking and installing. Sharp edges could cause injury.
Maintenance must be performed by qualified professionals. Otherwise, it may cause personal
injury or damage.

8
Do not place obstacles around air-inlets or inside of air-outlets. It may cause failure of appli-
ance or an accident.
Do not operate or stop the unit by inserting or pulling out the power plug. It may cause electric
shock or fire due to heat generation.
Do not damage or use an unspecified power cord.
If the power supply wire is damaged, it must be replaced by a qualified person in order to avoid
a hazard.
Do not modify power cord length or share the outlet with other appliances. It may cause
electric shock or fire due to heat generation.
Do not hold the plug by the head when taking it out. It may cause electric shock and damage.
Do not use strong detergent such as wax or thinner to clean the unit. The appearance may be
deteriorated due to change of product color or scratching of the surface.
Do not operate with wet hands or in damp environment. It may cause electric shock.
Do not direct airflow at room occupants directly. It could damage your health.
Do not allow water to run into electric parts. It may cause failure of machine or electric shock.
Do not use the socket if it is loose or damaged. It may cause fire or electric shock.
Do not use the power cord close to heating appliances. It may cause fire or electric shock.
Do not use the power cord near flammable gas or combustibles, such as gasoline, benzene,
thinner, etc. it may cause an explosion or fire.
Do not disassemble or modify unit. It may cause failure or electric shock.
Do not open the unit during operation. It may cause electric shock.
When the air filter is to be removed, do not touch the metal parts of the unit. It may cause
injury.
Do not clean the air conditioner with water. Water may enter the unit and degrade the insula-
tion. It may cause electric shock.
Do not place heavy objects on the power cord and ensure that the power cord is not com-
pressed. There is danger of fire or electric shock.
Do not drink water drained from air conditioner. It contains contaminants and could make you
sick.
Do not put a pet or house plant where it will be exposed to direct air flow. This could cause
injury.
Do not use for special purposes (i.e. preserve precisions devices, food, pets, plants and art
objects). It may cause deterioration of quality, etc.
Do not clean unit when power is on as it may cause fire and electric shock. It may cause an
injury.
Do not connect air conditioner to multipurpose socket. Otherwise, it may cause fire hazard.
Do install the air switch ((thermal-magnetic breaker). If not, it may cause malfunction.
Do not spill water on the remote controller, otherwise the remote controller may be broken.
Do not spray water on air conditioner. It may cause electric shock or malfunction.
Do not extend fingers or objects into air inlet or air outlet. It may cause personal injury or
damage.
Do not step on or put heavy objects on air conditioner. It may cause damage or personal injury.

9
The power supply cord with this air conditioner contains a current detection device designed to
reduce the risk of fire. Please refer to the section “Instructions for use” for details.
If the power supply cord is damaged, it cannot be repaired. It must be replaced with a cord from
the product manufacturer.
For your safety
• Do not store or use gasoline or other flammable vapors and liquids near 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
• 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 and behind the grill.
• Be sure the air conditioner is properly grounded. To minimize shock and hazards, proper
grounding is important. The power cord is equipped with a three-pong grounding plug for
protection against shock hazards.
• Your air conditioner must be used in a properly grounded wall receptible. If the wall recep-
tible you intend to use is not adequately grounded or protected by a time delay fuse or circuit
breaker, have a qualified electrician install the proper receptible.
• Ensure the receptible is accessible after the unit installation.
• Do not run air conditioner without side protective cover in place. This could result in mecha-
nical damage within the air conditioner.
• Do not, under any circumstances, cut, remove or bypass the grounding prong.
• Do not use an extension cord or an adapter plug.

10
General Instructions for Use
Power supply
The power supply cord contains a current device that senses damage to the power cord. To test
your power supply cord, do the following:
1. Plug in the Air Conditioner.
2. The power supply cord will haveTWO buttons on the plug head. Press theTEST button, you will
notice a click as the RESET button pops up.
3. Press the RESET button, again you will notice a click as the button engages.
4. The power supply cord is now supplying electricity to the unit. (On some products this is also
indicated by a light on the plug head.)
NOTICE:
• Do not use this device to turn the unit on or off.
• Always make sure the RESET button is pushed in for correct operation.
• The power supply must be replaced if it fails reset when either the TEST button is pushed, or it
cannot be reset. Please contact customer service.
• If power supply cord is damaged, it cannot be repaired. It MUST be replaced with a new cord.
Please contact customer service.
NOTE: The power cord of window type unit has creepage
protection device.
There is a test button and a reset button on the plug. You
are suggested to check the power cord periodically.
Check method: After putting through the power, the in-
dicator is ON. After pressing the TEST button, the indicator
is OFF and you can hear a sound. Then press the RESET
button, the indicator will be ON, which indicates the pro-
tection device is normal.
NOTE: Plug may be different with the actual product.
Please refer to actual product.
Operating temperature range
Indoor side DB/WB (°C/°F) Outdoor side DB/WB (°C/°F)
Maximum Cooling 40°C (104°F) / 26.7°C (80°F) 40°C (104°F) / 26.7°C (80°F)
The operating temperature range (outdoor temperature) for cooling unit only is 18°C to 40°C
(64.4°F to 104°F).
LCDI
POWER
RESET
TEST
RESET
TEST
Indicator
Indicator

11
Wiring
Security precautions
1. You must follow the electric safety regulations when installing the unit.
2. According to the local safety regulations, use a qualified power supply circuit and air switch
(thermal-magnetic breaker).
3. Make sure the power supply matches with the requirement of air conditioner. Unstable power
supply or incorrect wiring may result in electric shock, fire hazard or malfunction.
4. Properly connect the live wire, neutral wire and grounding wire of power socket.
5. Be sure to cut off the power supply before proceeding any work related to electricity and
safety.
6. Do not put the power on before finishing installation.
7. The air conditioner is a first-class electric appliance. It must be properly grounded. Please
make sure it is always grounded effectively, otherwise it may cause electric shock.
8. Do not use for other purposes the yellow-green wire or green wire in air conditioner other
than for grounding.
9. The grounding resistance should comply with national electric safety regulations.
10. Make sure the power supply complies with the requirement of air conditioner. Unstable power
supply or wrong wiring may lead to electric shock.
Electric wiring
• Must connect with ground reliably.
• The exclusive circuit must be used. But removable socket can’t be used because poor contact
of it can cause overheat or cause fire.
• Don’t pull the power cord strongly.
• Connecting method between air conditioners and power cord and interconnecting method of
each individual element with one another should be done according to the wiring diagram on
the unit.
• The air conditioner should be installed in accordance with national wiring regulation.
• An all-pole disconnection switch having a contact separation of at least 3 mm (1/8'') in all poles
should relate to fixed wiring.
• Air switch (thermal-magnetic breaker) should be installed in the circuit.

12
INSTALLATION
Parts Name
NOTE: Panel outlook picture, just for reference, please take the real unit as standard.
Control panel
Power cord
Air outlet
frame
Air-in panel
Fan direction
adjusting rod

13
Preparation for Installation
Tools for installation
Phillips
screwdriver Scissors
Screwdriver Pensil
Level bar Measuring
tape
Components included in the box - may vary from model to model
Window type
unit Brackets
Flexible screen Screws
Sealing strip
(with adhesive)
Sealing strip
(without
adhesive)
Remote
controller Batteries
User Manual

14
Installation Procedure
Location
How to install:
• Choose a location where the are no obstacles surrounding the unit, and where the plug is easily
accessible.
• Choose the installation space according to Figure A. The distance of obstructions from the
inside window unit should respect the dimensions indicated on Figure A.
Figure A
Basic requirements of location:
• Should not be near a place with strong heat sources, vapors, flammable or explosive gas, or
volatile objects spread in the air.
• Should not be near a place with high-frequency devices (such as welding machine, medical
equipment).
• Should not be near a place with oil or fumes in the air.
• Should not be near a place with sulfurated gas.
• There should be no obstruction near air inlet and air outlet.
• Select a location where the condensation water can be dispersed easily and won't affect other
people.
• The location should be able to withstand the weight of the unit and won't increase noise and
vibration.
• Try to keep far away from fluorescent lamp.
Top View
Front View Ceiling Side View
Wall Wall
Fence or
likewise
>500
mm
>500
mm
>300
mm
>300
mm
>500
mm
>1500
mm
<200 mm
>500
mm

15
NOTE: The upper guide rail and the side panels are offset to provide the proper pitch to the rear of
(5/16” or 7.9375 mm). This is necessary for proper condensed water utilization and drainage. Even
if you are not using the side panels, the rear pitch must be maintained!
Step 1:
Place unit on floor, a bench or a table. There is a Left-side and Right-side Filler Panel. Be sure to use
the proper panel for each side. When installed, the flange for securing the panel in place in the
windowsill will be facing into the room.
a. Hold the side Panel in one hand and gently pull back the center
to free the open end. See Figure 1.
b. Slide the free end “T” section of the panel directly into
the cabinet as shown in Figure 2. Slide the panel down.
Be sure to leave enough space to slip the top and bottom
of the frame into the rails on the cabinet.
c. Once the panel has been installed on the
side of the cabinet, make sure it sits se-
curely inside the frame channel by mak-
ing slight adjustments. Slide the top and
bottom ends of the frame into the top
and bottom rails of the cabinet. See Fig-
ure 3.
d. Slide the panel all the way in and repeat on the other side.
Figure 1
Figure 2
Upper guide rail Flexible screen
Lower guide
rail
Figure 3

16
NOTE: Your air conditioner is designed to install in standard double hung windows with opening
widths of 22” to 36” (55.88 to 91.44 cm) (Figure 4).
Lower sash must open sufficiently to allow a clear vertical opening of minimum 15 1/2”(39.37 cm).
Side louvers and the rear of the air conditioner must have clear air space to allow enough airflow
through the condenser, for heat removal. The rear of the unit must be outdoors, not inside a build-
ing or garage.
22” to 36”(55.88 cm to 91.44 cm)
15 1/2” (39.37 cm)
Figure 4
Step 2:
If your window is a weather-proof type window, the frame will not allow the air conditioner to
tilt properly (see step 4), which will prevent the unit from draining properly. In this case, before
installing the air conditioner, add wooden strap on the windowsill, and fix the wooden strap to the
windowsill.
Specification of wooden strap (see Figure 5):
• Width: about 2” (5.08 cm).
• Length: same to the inner frame size of
window.
• Height: Put the wooden strap on the
windowsill, top part of wooden strap
and window frame should be at the
same horizontal level, or higher than
the top part of window frame for about
1/4" - 1/2" (6.35 mm - 12.7 mm).
Step 3:
Cut the sealing strip into proper length. Stick the sealing
strip to the lower part of the window frame (see Figure 6).
Inner
wall
Exterior
wall
Windowssill
Weather-proof
window frame
1/4” - 1/2” (6.35 mm - 12.7 mm)
Figure 5
Wooden strap
Sealing strip with
adhesive
Figure 6

17
Step 4:
2 persons should work together to put the air conditioner into the window opening so the bottom
of the air conditioner frame is against the windowsill.
Upper guide rail stays at the middle lower side of window and then window can stick to the upper
guide rail when closing it.
Please note that the air conditioner should be placed at horizontal place or inclined outwards
slightly. Carefully close the window behind the top rail of the unit.
Check that air conditioner is tilted back about 1/4” to 1/2” (6.35 mm - 12.7 mm) (tilted about 3°
downward to the outside, see Figure 7A and Figure 7B). After proper installation, condensate
should not drain from the overflow drain hole during normal use, correct the slope otherwise.
Front Side Upper guide
rail
Lower guide
rail
Window frame
Horizontal or inclined
about 3
°
Figure 7A Figure 7B
Step 5:
Extend the side panels out against the window frame and use 5 type B screws to fix the panels on
the windowsill.
Window
frame
Windowsill
Figure 8

18
Step 6:
To secure lower sash in place, attach right angle sash lock with screw as shown.
NOTE: It is difficult to lock the windows with the sash lock for Vinyl-Clad windows, so you can use
window itself to lock.
Figure 9A Figure 9B
Plastic
window
Wooden
window
Step 7:
Cut the sealing strip the length of window. Plug the
sealing strip between glasses and window to prevent
rain and insects getting into the room (Figure 10).
NOTE: If the sealing strip is not suitable for your
window, it can be replaced.
Removing the air conditioner from window
1. Turn the air conditioner off and disconnect power cord.
2. Remove sash seal from between windows and unscrew sash lock.
3. Remove screws installed through frame and frame lock.
4. Close (slide) side panels into frame.
5. Keeping a firm grip on air conditioner, raise sash and carefully remove.
6. Be careful not to spill any condensate water while lifting unit from window.
7. Store parts WITH air conditioner.
Sealing strip
(without
adhesive)
Figure 10

19
CONTROL
Operating your air conditioner properly helps you obtain the best possible results. This section
explains proper air conditioner operation.
IMPORTANT:
• If you turn off the air conditioner, wait at least 3 minutes before turning it back on. This prevents
the air conditioner from blowing a fuse or tripping a circuit breaker.
• Do not try to operate your air conditioner in the cooling mode when outside temperature is
below 65 °F (18°C). The inside evaporator coil will freeze up, and the air conditioner will not
operate properly.
NOTE: In the event of a power failure, your air conditioner will operate as the previous settings
when the power is restored.
Remote Control
Mode
_+
AUTO
1 2
3 4
5 6
7 8
NOTE: This is a general purpose remote control
it could be used for air conditioners with multi-
function.
Instructions for remote control use:
• The distance between signal sender and
receiving window should be no more than
6 m (16.69 ft.), and there should be no
obstacles between them.
• Replace new batteries of the same model
when replacement is required.
• When you don’t use the remote control for
a long time, please take out the batteries.

20
1. POWER BUTTON
Press On/Off button to turn on or turn off the unit.
NOTE: Press this button to turn on air conditioner, the unit will operate in Energy Saver mode. If
the unit is energized after power failure, the unit will still operate according to the status before
power failure.
2. MODE BUTTON
Each time you press the button, a mode is selected in a sequence that goes from AUTO, COOL,
SAVE (Energy Saver), FAN and DRY as the following:
AUTO4COOL4SAVE4FAN4DRY
3. (-) BUTTON
Press the (-) button once to decrease the set temperature.
Press this button to decrease the set temperature. Pressing this button for 2 continuously
seconds will decrease the temperature quickly.
In AUTO mode, the setpoint temperature cannot be adjusted.
4. (+) BUTTON
Press the (+) button once to increase the set temperature.
Press this button to increase the set temperature. Pressing this button for 2 continuously
seconds will increase the temperature quickly.
In AUTO mode, the setpoint temperature cannot be adjusted.
5. FAN
This button is used to adjust the fan speed in a sequence from AUTO, speed 1, speed 2, speed 3
then back to AUTO.
Auto
Speed 1 Speed 2 Speed 3
6. I FEEL
Once this function is settled, remote control sends the information about room temperature to
the control panel and will adjust automatically. Press again this button to cancel I FEEL function
and the icon disappears.
Please put remote control near the user when this function is chosen. Do not put remote control
near something at high or low temperature in order to prevent false results.
Make sure to keep the minimum distance recommended between the remote control and the
appliance.
After 11 minutes, if the air conditioner does not receive this value from the remote control, the
unit will operate with the room temperature according to the air conditioner; this data will not
be as precise as the one send by the remote control.
NOTE: The remote control must point at the indoor unit receiving window at all time so that the
control signal is received by the unit.