Mitsubishi Heavy Industries FDE100VNPWVH, Data Book

'19 • PAC-DB-333

R32 REFRIGERANT USED

 CAUTION

1. General

•  That the installation of pipe-work shall be kept to a 

minimum.

•  That pipe-work shall be protected from physical 

damage.

•  That compliance with national gas regulations shall 

be observed.

•  That mechanical connections shall be accessible 

for maintenance purposes.

•  Keep any required ventilation openings clear of 

obstruction.

•  Servicing shall be performed only as recommended

by the manufacturer.

2. Unventilated areas

•  The appliance shall be stored in a well-ventilated 

area where the room size corresponds to the room 

3.

• 

4. Information on servicing

4.1  Checks to the area

•  Prior to beginning work on systems containing 

necessary to ensure that the risk of ignition is 

minimised.

•  For repair to the refrigerating system, 4.3 to 4.7 

shall be completed prior to conducting work on the 

system.

4.2  Work procedure

•  Work shall be undertaken under a controlled 

gas or vapour being present while the work is being 

performed.

4.3  General work area

• 

local area shall be instructed on the nature of work 

being carried out.

•  W

• 

•  Ensure that the conditions within the area have 

4.4  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 toxic or 

•  Ensure that the leak detection equipment being 

used is suitable for use with all applicable 

refrigerants, i.e. 

non-sparking, adequately sealed or intrinsically 

safe.

4.5 

•  If any hot work is to be conducted on the 

refrigeration equipment or any associated parts, 

available to hand. Have a dry powder or CO

2

extinguisher adjacent to the charging area.

4.6  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 

•  All possible ignition sources, including cigarette 

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 

•  “No Smoking” signs shall be displayed.
4.7  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.

4.8  Checks to the refrigeration equipment

•  Where electrical components are being changed, 

•  At all times the manufacturer’s maintenance and 

service guidelines shall be followed.

•  If in doubt consult the manufacturer’s technical 

department for assistance.

•  The following checks shall be applied to 

– 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.

4.9  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 no live electrical components and wiring are 

exposed while charging, recovering or purging 

the system;

–  that there is continuity of earth bonding.

5.  Repairs to sealed components

•  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.

•  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 

This shall include damage to cables, excessive 

number of connections, terminals not made to 

•  Ensure that the apparatus is mounted securely.

•  Ensure that seals or sealing materials have not 

degraded to the point that they no longer serve the 

atmospheres.

•  Replacement parts shall be in accordance with the 

manufacturer

NOTE

of some types of leak detection equipment.

Intrinsically safe components do not have to be 

isolated prior to working on them.

 WARNING

is leaked, together with an external ignition source, there is a 

possibility of ignition.

There is information included in the user’s manual and/or 

installation manual.

The user’s manual should be read carefully.

A service personnel should be handing this equipment with 

reference to the installation manual.

•  This safety precaution sheet is for R32 refrigerant. If you want to know the type of refrigerant in the unit, check the label attached to the outdoor unit.

•  The precautionary items mentioned below are distinguished into two levels,

 WARNING

 and 

 CAUTION

.

 WARNING

 : Wrong installation would cause serious consequences such as injuries or death.

 CAUTION

 : Wrong installation might cause serious consequences depending on circumstances.

•  Strict compliance of the domestic laws must be 

observed when disposing the appliance.

•  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: 

operating electric heater. 

•  Do not pierce or burn.

•  Be aware that refrigerants may not contain an 

odour.

 CAUTION

6. 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 

•  The test apparatus shall be at the correct rating.

• 

the manufacturer.

•  Other parts may result in the ignition of refrigerant 

in the atmosphere from a leak.

7. Cabling

•  Check that cabling will not be subject to wear, 

corrosion, excessive pressure, vibration, sharp 

of aging or continual vibration from sources such as 

compressors or fans.

8.

•  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 

9. Leak detection methods

•  Electronic leak detectors may be used to detect 

refrigerants, 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 

• 

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.

• 

removed/extinguished.

•  If a leakage of refrigerant is found which requires 

brazing, all of the refrigerant shall be recovered 

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.

10. Removal and evacuation

•  When breaking into the refrigerant circuit to make 

repairs – or for any other purpose – conventional 

procedures shall be used. However

refrigerants it is important that best practice is 

•  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 unit safe. 

This process may need to be repeated several 

times.

•  Compressed air or oxygen shall not be used for 

purging refrigerant systems.

• 

the working pressure is achieved, then venting to 

This process shall be repeated until no refrigerant 

is within 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 that ventilation is 

available.

11. Charging procedures

•  In addition to conventional charging procedures, the 

following requirements shall be followed.

does not occur when using charging equipment. 

Hoses or lines shall be as short as possible to 

minimise the amount of refrigerant contained in 

them.

– Cylinders shall be kept upright.

– Ensure that the refrigeration system is earthed 

prior to charging the system with refrigerant.

– Label the system when charging is complete (if 

not already).

refrigeration system.

•  Prior to recharging the system, it shall be pressure-

tested with the appropriate purging gas.

•  The system shall be leak-tested on completion of 

charging but prior to commissioning.

•  A follow up leak test shall be carried out prior to 

leaving the site.

12. 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.

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)  

volume liquid charge).

i)  Do not exceed the maximum working pressure of 

the cylinder, even temporarily.

j)  

and the process completed, make sure that the 

cylinders and the equipment are removed from site 

promptly and all isolation valves on the equipment 

k) Recovered refrigerant shall not be charged into 

another refrigeration system unless it has been 

cleaned and checked.

13. Labelling

•  Equipment shall be labelled 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 

refrigerant.

14. 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 labelled for that 

refrigerant (i.e. special cylinders for the recovery of 

refrigerant).

•  Cylinders shall be complete with pressure relief 

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 

•  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 recovery 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 

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.

15. Other safety precautions

•  A brazed, welded, or mechanical connection shall 

be made before opening the valves to permit 

parts.

•  Flammable refrigerant used, refrigerant tubing 

protected or enclosed to avoid mechanical damage 

(IEC/EN 60335-2-40/A1).

•  Tubing protected to extent that it will not be handled 

or used for carrying during moving of product (IEC/

EN 60335-2-40/A1).

•  Flammable refrigerant used, low temperature solder 

alloys, such as lead/tin alloys, not acceptable for 

pipe connections (IEC/EN 60335-2-40/A1).

• 

procured.

PSA012B839A

B

- 98 -