TECO Platinum 3D Inverter Series User manual

SPLIT-TYPE ROOM AIR CONDITIONER
TECO
The Comfoable Choice
Platinum 3D Inverter Series
Operation &
Installation Manual
Heat Pump Model:
7:6TSO26H3DVJT
TWS-TSO35H3DVJT
TWS-TSO72H3DVJT
TWS-TSO88H3DVJT
TWS-TSO52H3DVJT
IMPORTANT NOTE:
Thank you for selecting a TECO quality Air Conditioner.
Read this manual carefully before installing or operating
your new air conditioning unit. Make sure to save this
manual for future reference.
The design and specifications are subject to change
without prior notice for product improvement. Consult
with the sales agency or manufacturer for details.
w

CONTENTS
SAFETY PRECAUTIONS .......................................................................... 1
OPERATION
NAME OF PARTS ....................................................................................... 3
REMOTE CONTROL & FUNCTIONS ............................................................. 5
REPLACE OF BATTERIES .......................................................................... 11
OPERATION INSTRUCTIONS .......................................................................... 12
MAINTENANCE ....................................................................................... 13
INSTALLATION
INSTALLATION SERVICE PRECAUTIONS (R32) ................................... 14
INDOOR UNIT INSTALLATION .......................................................................... 21
OUTDOOR UNIT INSTALLATION ............................................................. 27
REFRIGERANT PIPING CONNECTION ............................................................. 30
EVACUATION INSTRUCTIONS .......................................................................... 31
INSTALLATION FINAL CONFIRMATION ................................................ 32
REPAIRS, SERVICE & WARRANTY ............................................................. 35
TROUBLESHOOTING ....................................................................................... 34

SAFETY PRECAUTIONS
Read Safety Precautions Before Operation and Installation.
Incorrect Installation due to ignoring instructions can cause serious damage or injury.
The seriousness of potential damage or injuries in classified as either WARNING or CAUTION.

WARNING
This symbol indicates the possibility of
personnel injury or loss of life.
0 CAUTION
This symbol indicates the possibility of
property damage or serious consequences.



! 
!

!
A WARNING
• This appliance is not intended for use by persons (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.
• If an abnormal situation arises (like a burning smell), immediately turn off the unit and
disconnect the power. Call your dealer for instructions to avoid electric shock, fire or
injury.
• Do not use flammable sprays such as hair spray, lacquer or paint near the unit. This
may cause fire or combustion.
• Do not operate the air conditioner in places near or around combustible gases. Emitted
gas may collect around the unit and cause explosion.
• Do not operate your air conditioner in a wet room such as a bathroom or laundry room.
Too much exposure to water can cause electrical components to short circuit.
• Do not operate the air conditioner with wet hands. This may cause electric shock.
• If the air conditioner is used together with burners or other heating devices, thoroughly
ventilate the room to avoid oxygen deficiency.
1

SAFETY PRECAUTIONS
• Do not insert fingers, rods or other objects into the air inlet or outlet. This may cause
injury, since the fan may be rotating at high speeds.
• Do not expose your body directly to cool air for a prolonged period of time.
• In certain functional environments, such as kitchens, server rooms, etc., the use of
specially designed air-conditioning units is highly recommended.
• Make sure that water condensation can drain unhindered from the unit.
• Do not use device for any other purpose than its intended use.
• Do not climb onto or place objects on top of the outdoor unit.
• Turn off the air conditioner and disconnect the power if you are not going to use it for a
long time.
• Turn off the unit during storms.
0 CAUTION
DISPOSAL GUIDELINES
This marking shown on the product or its literature, indicates that waste
electrical and electrical equipment should not be mixed with general
household waste.
• Young children should be supervised to ensure that they do not play
with the appliance and packaging.
• Packing (e.g. wraps, polystyrene etc.) can be dangerous for children.
There is a risk of suffocation . Keep packaging materials away from
children.
• Contact your local authorities for correct method of disposal. Dispose of
all packaging in a responsible manner in accordance with local
regulations.
CLEANING AND MAINTENANCE WARNINGS
• Turn off the device and disconnect the power before cleaning. Failure to do so can
cause electrical shock.
• Do not clean the air conditioner with excessive amounts of water.
• Do not clean the air conditioner with combustible cleaning agents. Combustible
cleaning agents can cause fire or deformation.
2

NAME OF PARTS
Emergency button
Front panel
Mounting plate
Air inlet
Drainage pipe
Wiring cover
Connection wiring
Valve protective cover
With the protective cover removed
Liquid valve
(High pressure valve)
Gas valve
(Low pressure valve)
Refrigerant
connecting pipe
Air deflector and flap
Air outlet
Air outlet
Air filter
INDOOR UNIT
OUTDOOR UNIT
3

NAME OF PARTS
1
2
3
1
2
3
Indicator for Timer, Temperature or Error codes.
Lights up during Timer operation.
SLEEP mode
INDOOR DISPLAY
NOTE: Illustrations in this manual are for explanatory purposes. The actual shape
of your unit may be slightly different. The actual shape shall prevail.
4

REMOTE CONTROL & FUNCTIONS
REMOTE CONTROL DISPLAY
Symbols
Cooling Mode
Dry Mode
Fan only Mode
Heating Mode
Fan speed:
Auto/ low/ low-mid/ mid/ mid-high/ high
TURBO function
Mute function
Up-down auto swing
Temperature indicator
Meaning
Left-right auto swing
SLEEP function
Timer
Battery indicator
Auto Mode
Health function
I FEEL function
ECO Mode
8 heating function
oC
Signal indicator
Gentle wind
Child-Lock
Display ON/OFF
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Anti-Mildew
Self-Clean function
GEN function
NOTE: The display and some functions of the remote control may vary according to
the model.
5

REMOTE CONTROL & FUNCTIONS
No.
Button Function
To select the mode of operation (AUTO, COOL, DRY, FAN, HEAT).
To activate/deactivate the TURBO function.
To decrease temperature, or Timer setting hours.
To increase temperature, or Timer setting hours.
To turn on/off the air conditioner .
To select the fan speed of auto/mute/low/low-mid/mid/mid-high/high/turbo.
8
11
6
7
9
MODE
TURBO
1
2
3
4
FAN
5
To activate/deactivate the ECO function.
ECO
To set the time for timer on/off.
TIMER
To switch-on/off the function SLEEP.
SLEEP
10
To switch-on/off the LED display.
DISPLAY
12
13
To switch-on/off the I FEEL function.
I FEEL
14
To switch-on/off the MUTE function.
MUTE
Long press to activate/deactivate the GEN function (depending on models).
15
16
To activate/deactivate the CHILD-LOCK function.
MODE + TIMER
17
To activate/deactivate the SELF-CLEAN function (depending on models).
18
To activate/deactivate the GENTLE WIND function (depending on models).
FAN + MUTE
19
To activate/deactivate the HEALTH function (depending on models).
HEALTH
CLEAN
Long press to activate/deactivate the 8oC heating function (Not avail).
To activate/deactivate the ANTI-MILDEW function.
ANTI-MILDEW
or
GENTLE WIND
To stop or start horizontal flaps louver movement or set the desired up/down air flow direction.
To stop or start vertical deflectors louver movement or set the desired left/right air flow direction.
NOTE:
•The display and some functions of the remote control may vary according to the
model.
•The shape and position of buttons and indicators may vary according to the
model, but their function is the same.
•The unit confirms the correct reception of each button with the beep.
6

REMOTE CONTROL & FUNCTIONS
COOLING MODE HEATING MODE
The cooling function allows the air
conditioner to cool the room and
reduce Air humidity at the same
time.
HEAT
The heating function allows the air
conditioner to heat the room.
To activate the cooling function (COOL), press the
MODE button until the symbol appears on
the display.
With the button or set a temperature lower
than that of the room.
To activate the heating function (HEAT), press the
MODE button until the symbol appears on the
display.
With the button or set a temperature higher
than that of the room.
In HEATING operation, the appliance can
automatically activate a defrost cycle, which
is essential to clean the frost on the condenser
so as to recover its heat exchange function.
This procedure usually lasts for 2-10 minutes.
During defrosting, indoor unit fan stop
operation. After defrosting, it resumes to
HEATING mode automatically.
COOL
(For North American market)
If necessary, you can press ECO button 10
times within 8 seconds under heating mode
to start the forced defrosting. It will defrost
the outdoor ice much more fast.
DRY MODE
This function reduces the humidity
of the air to make the room more
comfortable.
DRY
To set the DRY mode, Press MODE until
appears in the display. An automatic function of
pre-setting is activated.
FAN MODE (Not FAN button)
FAN Fan mode, air ventilation only.
To set the FAN mode, press MODE until
appears on the display.
AUTO MODE
Automatic mode.
AUTO
To set the AUTO mode, press MODE until
appears on the display.
In AUTO mode the run mode will be set
automatically according to the room temperature.
FAN SPEED function (FAN button)
FAN Change the operating fan speed.
Press FAN button to set the running fan speed,
it can be set to AUTO/ MUTE/ LOW/ LOW-MID
/ MID/ MID-HIGH/ HIGH/ TURBO speed circularly.
Child-Lock function
1. Long press MODE and TIMER button together
to active this function, and do it again to
deactivate this function.
2. Under this function, no single button will active.
(Flash)
7

REMOTE CONTROL & FUNCTIONS
To automatic switch on the
appliance.
TIMER function ---- TIMER OFF
To automatic switch off the
appliance.
When the unit is switch-off, you can set the
TIMER ON.
To set the time of automatic switch-on as below:
When the unit is switch-on, you can set the
TIMER OFF.
To set the time of automatic switch-off, as below:
1. Confirm the appliance is ON.
2. Press the TIMER button at first time to set the
switch-off.
Press or to set the needed timer.
3. Press TIMER button at the second time to
confirm.
CANCEL it by press TIMER button.
Note: All programming should be operated within
5 seconds, otherwise the setting will be
cancelled.
TIMER
TIMER
TURBO function
TURBO
To activate turbo function, press the TURBO
button, and will appear on the display.
Press again to cancel this function.
In COOL/ HEAT mode, when you select TURBO
feature, the appliance will turn to quick COOL or
quick HEAT mode, and operate the highest fan
speed to blow strong airflow.
TIMER function ---- TIMER ON SWING function
1. Press TIMER button first time to set
the switch-on, and will appear on the
remote display and flashes.
2. Press or to button to set desired Timer-on
time. Each time you press the button, the time
increases/decreases by half an hour between 0
and 10 hours and by one between 10 and 24
hours.
3. Press TIMER button second time to confirm.
4. After Timer-on setting, set the needed mode
(Cool/ Heat/ Auto/ Fan/ Dry), by press the
MODE button. And set the needed fan speed,
by press FAN button. And press or to set
the needed operation temperature.
CANCEL it by press TIMER button.
Never position Flaps manually, the delicate
mechanism might seriously damaged!
Never put fingers, sticks or other objects into
the air inlet or outlet vents. Such accidental
contact with live parts might cause
unforeseeable damage or injury.
1. Press the button SWING to activate the louver,
1.1 Press to activate the horizontal flaps
to swing from up to down, the will appear
on the remote display.
1.2 Press to active the vertical deflectors
to swing from left to right, the will appear
on the remote display.
1.3 Do it again to stop the swing movement at
the current angle.
2. If the vertical deflectors are positioned manually
which placed under the flaps, they allow to move
the air flow direct to rightward or leftward.
3.Long press or over 3 seconds to select
more angles of the airflow direction.
8

REMOTE CONTROL & FUNCTIONS
MUTE function ECO function
MUTE
1. Press MUTE button to active this function,
and will appears on the remote display.
Do it again to deactivate this function.
2. When the MUTE function runs, the remote
controller will display the auto fan speed, and
the indoor unit will operate at lowest fan
speed to be quiet feeling.
3. When press FAN/ TURBO button, the
MUTE function will be cancel. MUTE function
can not be activated under dry mode.
I FEEL function
Press I FEEL button to active the function, the
will appear on the remote display.
Do it again to deactivate this function.
This function enables the remote control to
measure the temperature at its current location,
and send this signal to the air conditioner to
optimize the temperature around you and ensure
the comfort.
It will automatically deactivate 2 hours later.
I FEEL
DISPLAY function (Indoor display)
DISPLAY
Switch ON/OFF the LED display on
panel.
Press DISPLAY button to switch off the LED
display on the panel. Press again to switch on the
LED display.
ECO In this mode the appliance
automatically sets the operation to
save energy.
Press the ECO button, the appears on the
display, and the appliance will run in ECO mode.
Press again to cancel it.
Note: The ECO function is available in both
COOLING and HEATING modes.
SLEEP function
SLEEP Pre-setting automatic operating
program.
After 10 hours running in sleep mode, the air
conditioner will change to the previous setting
mode.
Press SLEEP button to activate the SLEEP
function, and appears on the display.
Press again to cancel this function.
9

REMOTE CONTROL & FUNCTIONS
SELF-CLEAN function
1. This function helps carry away the accumulated
dirt, bacteria, etc from the indoor evaporator.
2. This function will run about 30 minutes, and it
will return to the pre-setting mode. You can
press button to cancel this function during
the process.
You will hear 2 beeps when it's finished or
cancelled.
It's normal if there is some noise during this
function process, as plastic materials expand
with heat and contract with cold.
Indoor unit
Outdoor unit
oo
Temp < 86 F (30 C)
oo o o
41 F (5 C) < Temp < 86 F (30 C)
We suggest operating this function at the
following ambient conditions to avoid certain
safety protection features.
It's suggested to utilize this function every
3 months.
Only optional for some heating pump inverter
appliance.
To active this function, turn off the indoor unit
at first, then press CLEAN button
then you will hear a beep, AC will
appear on the indoor LED, and will
appear on the remote display .
ANTI-MILDEW function
Press button to activate the ANTI-MILDEW
function, will appear on the display. Do it again
to deactivate this function. After running COOL/
DRY for more than 30 minutes, you can operate
this function, the unit will blow airflow for about
15 minutes to dry the inner parts to avoid mildew,
then shuts off the unit.
Note: ANTI-MILDEW function only available in
DRY/COOLING mode.
ANTI-
MILDEW
ANTI-
MILDEW
10

REPLACE OF BATTERIES
Replacement of Batteries
Remove the battery cover plate from the rear of the remote control, by sliding it in direction as
the arrow.
Install the batteries according the direction (+ and -)shown on the Remote Control.
Reinstall the battery cover by sliding it into place.
Use 2 pieces LRO3 AAA (1.5V) batteries.
Do not use rechargeable batteries.
Replace the old batteries with new ones of the same
type when the display is no longer legible.
Do not dispose batteries as unsorted municipal waste.
Collection of such waste separately for special
treatment is necessary.
Note:
1. Direct the remote control toward the Air conditioner.
2. Check that there are no objects between the remote control and the Signal receptor in the
indoor unit.
3. Never leave the remote control exposed to the rays of the sun.
4. Keep the remote control at a distance of at least 1m from the television or other electrical
appliances.
For some model, each time when insert the batteries in the remote controller for the first time,
you can set the Cooling only or Heating pump control type. As soon as you insert the batteries,
turn off the remote controller, and operate as below.
1. Long press the MODE button, until the ( ) icon flash, to set the Cooling only type.
2. Long press the MODE button, until the ( ) icon flash, to set the Heating pump type.
Note: If you set the remote control in cooling mode, it will not be possible to activate the
heating function in units with a heating pump. If you need to reset, take out the
batteries and install again.
For some model of remote controller, you can program the temperature display between
oo
C and F.
1. Press and hold the TURBO button over 5 seconds to get into the change mode;
oo
2. Press and hold the TURBO button, until it switch to C and F;
3. Then release the pressing and wait for 5 seconds, the function will be selected.
11

OPERATION INSTRUCTIONS
It beeps briefly once.
It keeps beeping for a while
It beeps briefly twice.
Attempt to use the air conditioner under the temperature beyond the specified range may
cause the air conditioner protection device to start and the air conditioner may fail to operate.
Therefore, try to use the air conditioner in the following temperature conditions.
With the power supply connected, restart the air conditioner after shutdown, or switch it to
other mode during operation, and the air conditioner protection device will start. The
compressor will resume operation after 3 minutes.
Characteristics of heating operation (applicable to Heating pump)
Preheating:
When the heating function is enabled, the indoor unit will take 2~5 minutes for preheating, after
that the air conditioner will start heating and blows warm air.
Defrosting:
During heating, when the outdoor unit frosted, the air conditioner will enable the automatic
defrosting function to improve the heating effect. During defrosting, the indoor and outdoor fans
stop running. The air conditioner will resume heating automatically after defrosting finish.
Emergency button:
Open the panel and find the emergency button on the electronic control box when the remote
controller fails . (Always press the emergency button with insulation material.)
Current status Enter mode
Respond
Operation
Standby
Running
Standby
(Only for heating pump)
Press the emergency button
twice in 3 seconds
Cooling mode
Off mode
Heating mode
Press the emergency button
once
Press the emergency button
once
(open the panel of indoor unit)
control-box cover
Inverter air conditioner:
Dry
Heating Cooling
Room temperature
Outdoor temperature
Temperature
MODE
-15°C~24°C (5°F~75°F)
0°C~27°C (32°F~80°F) 17°C~32°C (63°F~90°F)
T1 climate: 15°C~50°C (59°F~122°F)
12

MAINTENANCE
Clean
the unit
When cleaning, you must shut down the machine and cut off the power supply for more
than 5 minutes.
Under no circumstances should the air conditioner be flushed with water.
Volatile liquid (e.g. thinner or gasoline) will damage the air conditioner, so only use soft
dry cloth or wet cloth dipped with neutral detergent to clean the air conditioner.
Pay attention to cleaning the filter screen regularly to avoid dust covering which will
affect the filter screen effect. When the operating environment is dusty, the cleaning
frequency should be increased appropriately.
After removing the filter screen, do not touch the fins of the indoor unit to avoid scratching.
Tip: Wipe frequently to keep air conditioner clean and good appearance .
Wring it dry Gentle wipe the unit surface
Warning
Opposite to the
direction of taking
out the filter
Take out the filter
from the unit
Clean the filter with
soapy water and air dry it
Replace the filter
Tip: When you find accumulated dust in the filter, please clean the filter in time to
ensure the clean, healthy and efficient operation inside the air conditioner.
Clean
the filter
When the air conditioner is not in use for a long time, do the following work:
Take out the batteries of the remote controller and disconnect the power supply of
the air conditioner.
When starting to use after long-term shutdown:
1. Clean the unit and filter screen;
2. Check whether there are obstacles at the air inlet and outlet of indoor and outdoor
units;
3. Check whether the drain pipe is unobstructed;
Install the batteries of the remote controller and check whether the power is on.
Service and
maintenance
<40
(104 )
<40
(104 )
13

INSTALLATION SERVICE PRECAUTIONS (R32)
Operating instructions Read technical manual
Caution: Risk of fire
1. Check the information in this manual to find out the dimensions of space needed for prop
installation of the device, including the minimum distances allowed compared to adjacent
structures.
2. Appliance shall be installed, operated and stored in a room with a floor area larger than 4m2.
3. The installation of pipe-work shall be kept to a minimum.
4. The pipe-work shall be protected from physical damage, and shall not be installed in an
unventilated space if the space is smaller than 4m2.
5. The compliance with national gas regulations shall be observe
6. The mechanical connections shall be accessible for maintenance purpose
7. Follow the instructions given in this manual for handling, installing, cleaning, maintaining a
disposing of the refrigerant.
8. Make sure ventilation openings clear of obstruction.
9. Notice: The servicing shall be performed only as recommended by the manufacturer.
10.Warning: The appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as specified for operation.
11.Warning: The appliance shall be stored in a room without continuously operating open flames
(for example an operating gas appliance) and ignition sources (for example an operating
electric heater).
12.The appliance shall be stored so as to prevent mechanical damage from occurring.
13.It is appropriate that anyone who is called upon to work on a refrigerant circuit should hold a
valid and up-to-date certificate from an assessment authority accredited by the industry and
recognizing their competence to handle refrigerants, in accordance with the assessment
specification recognized in the industrial sector concerned. Service operations should only be
carried out in accordance with the recommendations of the equipment manufacturer.
Maintenance and repair operations that require the assistance of other qualified persons must
be conducted under the supervision of the person competent for the use of flammable
refrigerants.
14.Every working procedure that affects safety means shall only be carried out by competent
persons.
15.Warning:
•Do not use means to accelerate the defrosting process or to clean, other than those
recommended by the manufacturer.
•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.
•Be aware that refrigerants may not contain an odor.
14

16. Information on servicing:
1) Checks to the area
Prior to beginning work on systems containing flammable refrigerants, safety checks are
necessary to ensure that the risk of ignition is minimized. For repair to the refrigerating system,
the following precautions shall be complied with prior to conducting work on the system.
2) Work procedure
Work shall be undertaken under a controlled procedure so as to minimize the risk of a
flammable gas or vapor being present while the work is being performed.
3) General work area
All maintenance staff and others working in the local area shall be instructed on the nature of
work being carried out. Work in confined spaces shall be avoided. The area around the
workspace shall be sectioned off. Ensure that the conditions within the area have been made
safe by control of flammable material
4) Checking for presence of refrigerant
The area shall be checked with an appropriate refrigerant detector prior to and during work, to
ensure the technician is aware of potentially flammable atmospheres. Ensure that the leak
detection equipment being used is suitable for use with flammable refrigerants, i.e.
non-sparking, adequately sealed or intrinsically safe.
5) Presence of fire extinguisher
If any hot work is to be conducted on the refrigeration equipment or any associated parts,
appropriate fire extinguishing equipment shall be available to hand. Have a dry powder or CO 2
fire extinguisher adjacent to the charging area.
6) No ignition sources
No person carrying out work in relation to a refrigeration system which involves exposing any
pipe work shall use any sources of ignition in such a manner that it may lead to the risk of fire
or explosion. All possible ignition sources, including cigarette smoking, should be kept
sufficiently far away from the site of installation, repairing, removing and disposal, during
which refrigerant can possibly be released to the surrounding space. Prior to work taking
place, the area around the equipment is to be surveyed to make sure that there are no
flammable hazards or ignition risks. No Smoking signs shall be displayed.
7) Ventilated area
Ensure that the area is in the open or that it is adequately ventilated before breaking into the
system or conducting any hot work. A degree of ventilation shall continue during the period
that the work is carried out.
The ventilation should safely disperse any released refrigerant and preferably expel it
externally into the atmosphere.
8) Checks to the refrigeration equipment
Where electrical components are being changed, they shall be fit for the purpose and to the
correct specification. At all times the manufacturer's maintenance and service guidelines shall
be followed.
If in doubt consult the manufacturer's technical department for assistance.
INSTALLATION SERVICE PRECAUTIONS (R32)
15

The following checks shall be applied to installations using flammable refrigerants:
-- The charge size is in accordance with the room size within which the refrigerant containing
parts are installed;
-- The ventilation machinery and outlets are operating adequately and are not obstructed;
-- If an indirect refrigerating circuit is being used, the secondary circuit shall be checked for the
presence of refrigerant;
-- Marking to the equipment continues to be visible and legible. Markings and signs that are
illegible shall be corrected;
-- Refrigeration pipe or components are installed in a position where they are unlikely to be
exposed to any substance which may corrode refrigerant containing components, unless the
components are constructed of materials which are inherently resistant to being corroded or
are suitably protected against being so corroded.
9) Checks to electrical devices
Repair and maintenance to electrical components shall include initial safety checks and
component inspection procedures. If a fault exists that could compromise safety, then no
electrical supply shall be connected to the circuit until it is satisfactorily dealt with. If the fault
cannot be corrected immediately but it is necessary to continue operation, an adequate
temporary solution shall be used. This shall be reported to the owner of the equipment so all
parties are advised.
Initial safety checks shall include:
-- That capacitors are discharged: this shall be done in a safe manner to avoid possibility of
sparking;
-- That there no live electrical components and wiring are exposed while charging, recovering
or purging the system;
-- That there is continuity of earth bonding.
17. Repairs to sealed components
1) During repairs to sealed components, all electrical supplies shall be disconnected from the
equipment being worked upon prior to any removal of sealed covers, etc. If it is absolutely
necessary to have an electrical supply to equipment during servicing, then a permanently
operating form of leak detection shall be located at the most critical point to warn of a
potentially hazardous situation.
2) Particular attention shall be paid to the following to ensure that by working on electrical
components, the casing is not altered in such a way that the level of protection is affected. This
shall include damage to cables, excessive number of connections, terminals not made to original
specification, damage to seals, incorrect fitting of glands, etc. Ensure that apparatus is mounted
securely. Ensure that seals or sealing materials have not degraded such that they no longer serve
the purpose of preventing the ingress of flammable atmospheres. Replacement parts shall be in
accordance with the manufacturer's specifications.
NOTE: The use of silicon sealant may inhibit the effectiveness of some types of leak detection
equipment. Intrinsically safe components do not have to be isolated prior to working on them.
18. Repair to intrinsically safe components
Do not apply any permanent inductive or capacitance loads to the circuit without ensuring that
this will not exceed the permissible voltage and current permitted for the equipment in use.
Intrinsically safe components are the only types that can be worked on while live in the presence
of a flammable atmosphere. The test apparatus shall be at the correct rating. Replace components
only with parts specified by the manufacturer. Other parts may result in the ignition of refrigerant
in the atmosphere from a leak.
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19. Cabling
Check that cabling will not be subject to wear, corrosion, excessive pressure, vibration, sharp
edges or any other adverse environmental effects. The check shall also take into account the
effects of aging or continual vibration from sources such as compressors or fans.
20. Detection of flammable refrigerants
Under no circumstances shall potential sources of ignition be used in the searching for or
detection of refrigerant leaks. A halide torch (or any other detector using a naked flame) shall
not be used.
21. Leak detection methods
The following leak detection methods are deemed acceptable for systems containing flammable
refrigerants.
Electronic leak detectors shall be used to detect flammable refrigerants, but the sensitivity may
not be adequate, or may need re-calibration. (Detection equipment shall be calibrated in a
refrigerant-free area.) Ensure that the detector is not a potential source of ignition and is suitable
for the refrigerant used. Leak detection equipment shall be set at a percentage of the LFL of the
refrigerant and shall be calibrated to the refrigerant employed and the appropriate percentage of
gas (25 % maximum) is confirmed. Leak detection fluids are suitable for use with most refrigerants
but the use of detergents containing chlorine shall be avoided as the chlorine may react with the
refrigerant and corrode the copper pipe-work. If a leak is suspected, all naked flames shall be
removed/ extinguished. If a leakage of refrigerant is found which requires brazing, all of the
refrigerant shall be recovered from the system, or isolated (by means of shut off valves) in a part
of the system remote from the leak. Oxygen free nitrogen (OFN) shall then be purged through the
system both before and during the brazing process.
22. Removal and evacuation
When breaking into the refrigerant circuit to make repairs or for any other purpose conventional
procedures shall be used. However, it is important that best practice is followed since
inflammability is a consideration. The following procedure shall be adhered to:
-- Remove refrigerant;
-- Purge the circuit with inert gas;
-- Evacuate;
-- Purge again with inert gas;
-- Open the circuit by cutting or brazing.
The refrigerant charge shall be recovered into the correct recovery cylinders. The system shall be
flushed with OFN to render the unit safe. This process may need to be repeated several times.
Compressed air or oxygen shall not be used for this task.
Flushing shall be achieved by breaking the vacuum in the system with OFN and continuing to fill
until the working pressure is achieved, then venting to atmosphere, and finally pulling down to a
vacuum. This process shall be repeated until no refrigerant is within the system. When the final
OFN charge is used, the system shall be vented down to atmospheric pressure to enable work to
take place. This operation is absolutely vital if brazing operations on the pipe-work are to take
place.
Ensure that the outlet for the vacuum pump is not close to any ignition sources and there is
ventilation available.
23. Decommissioning
Before carrying out this procedure, it is essential that the technician is completely familiar with
the equipment and all its detail. It is recommended good practice that all refrigerants are
recovered safely. Prior to the task being carried out, an oil and refrigerant sample shall be taken
in case analysis is required prior to re-use of reclaimed refrigerant. It is essential that electrical
power is available before the task is commenced.
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a) Become familiar with the equipment and its operation.
b) Isolate system electrically.
c) Before attempting the procedure, ensure that:
. mechanical handling equipment is available, if required, for handling refrigerant cylinders;
. all personal protective equipment is available and being used correctly;
. the recovery process is supervised at all times by a competent person;
. recovery equipment and cylinders conform to the appropriate standards.
d) Pump down refrigerant system, if possible.
e) If a vacuum is not possible, make a manifold so that refrigerant can be removed from various
parts of the system.
F) Make sure that cylinder is situated on the scales before recovery takes place.
g) Start the recovery machine and operate in accordance with manufacturer's instructions.
h) Do not overfill cylinders. (No more than 80 % volume liquid charge).
i) Do not exceed the maximum working pressure of the cylinder, even temporarily.
J) When the cylinders have been filled correctly and the process completed, make sure that the
cylinders and the equipment are removed from site promptly and all isolation valves on the
equipment are closed off.
K) Recovered refrigerant shall not be charged into another refrigeration system unless it has been
cleaned and checked.
24. Labeling
Equipment shall be labeled stating that it has been de-commissioned and emptied of refrigerant.
The label shall be dated and signed. Ensure that there are labels on the equipment stating the
equipment contains flammable refrigerant.
25. Recovery
When removing refrigerant from a system, either for servicing or decommissioning, it is
recommended good practice that all refrigerants are removed safely.
When transferring refrigerant into cylinders, ensure that only appropriate refrigerant recovery
cylinders are employed. Ensure that the correct number of cylinders for holding the total system
charge are available. All cylinders to be used are designated for the recovered refrigerant and
labeled for that refrigerant (i.e. Special cylinders for the recovery of refrigerant). Cylinders shall
be complete with pressure-relief valve and associated shut-off valves in good working order.
Empty recovery cylinders are evacuated and, if possible, cooled before recovery occurs.
The recovery equipment shall be in good working order with a set of instructions concerning the
equipment that is at hand and shall be suitable for the recovery of all appropriate refrigerants
including, when applicable, flammable refrigerants. In addition, a set of calibrated weighing scales
shall be available and in good working order. Hoses shall be complete with leak-free disconnect
couplings and in good condition. Before using the recovery machine, check that it is in satisfactory
working order, has been properly maintained and that any associated electrical components are
sealed to prevent ignition in the event of a refrigerant release. Consult manufacturer if in doubt.
The recovered refrigerant shall be returned to the refrigerant supplier in the correct recover
cylinder, and the relevant waste transfer note arranged. Do not mix refrigerants in recovery units
and especially not in cylinders.
If compressors or compressor oils are to be removed, ensure that they have been evacuated to an
acceptable level to make certain that flammable refrigerant does not remain within the lubricant.
The evacuation process shall be carried out prior to returning the compressor to the suppliers.
Only electric heating to the compressor body shall be employed to accelerate this process. When
oil is drained from a system, it shall be carried out safely.
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