45MUAAQ: Owner’s Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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1. Installation (where refrigerant pipes are allowed)
–Any person 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 assessment specification.
–Maintenance and repair requiring the assistance of other skilled
personnel shall be carried out under the supervision of the person
competent in the use of flammable refrigerants.
–That the installation of pipe-work shall be kept to a minimum.
–That pipe-work shall be protected from physical damage.
–Where refrigerant pipes shall be compliance with national gas
regulations.
–That mechanical connections shall be accessible for maintenance
purposes.
–Be more careful that foreign matter (oil, water, etc) does not enter
the piping. Also, when storing the piping, securely seal the
opening by pinching, taping, etc.
–Appliance shall be stored in a well ventilated area where the room
size corresponds to the room area as specific for operation.
–Joints shall be tested with detection equipment with a capability of
1/8 oz (5g)/year of refrigerant or better, with the equipment in
standstill and under operation or under a pressure of at least these
standstill or operation conditions after installation.
–In cases that require mechanical ventilation, ventilation openings
shall be kept clear of obstruction.
LEAK DETECTION SYSTEM installed. Unit must be powered
except for service. For the unit with refrigerant sensor, when the
refrigerant sensor detects refrigerant leakage, the indoor unit will
display a error code and emit a buzzing sound, the compressor of
outdoor unit will immediately stop, and the indoor fan will start
running. The service life of the refrigerant sensor is 15 years. When
the refrigerant sensor malfunctions, the indoor unit will display the
error code FHCC. The refrigerant sensor can not be repaired and can
only be replaced by the manufacture. It shall only be replaced with
the sensor specified by the manufacture.
2. Because a FLAMMABLE REFRIGERANT is used
The requirements for installation space of appliance and/or
ventilation requirements are determined according to:
– the mass charge amount (M) used in the appliance,
–-the installation location,
–-the type of ventilation of the location or of the appliance.
–-piping material, pipe routing, and installation shall include
protection from physical damage in operation and service, and be
in compliance with national and local codes and standards, such as
ASHRAE 15, IAPMO Uniform Mechanical Code, ICC
International Mechanical Code, or CSA B52. All field joints shall
be accessible for inspection prior to being covered or enclosed.
–-that protection devices, piping, and fittings shall be protected as
far as possible against adverse environmental effects, for example,
the danger of water collecting and freezing in relief pipes or the
accumulation of dirt and debris;
–-that piping in refrigeration systems shall be so designed and
installed to minimize the likelihood of hydraulic shock damaging
the system;
–-that steel pipes and components shall be protected against
corrosion with a rustproof coating before applying any insulation;
–-that precautions shall be taken to avoid excessive vibration or
pulsation;
–-the minimum floor area of the room shall be mentioned in the
form of a table or a single figure without reference to a formula;
–-after completion of field piping for split systems, the field
pipework shall be pressure tested with an inert gas and then
vacuum tested prior to refrigerant charging, according to the
following requirements:
a. The minimum test pressure for the low side of the system shall be
the low side design pressure and the minimum test pressure for the
high side of the system shall be the high side design pressure,
unless the high side of the system cannot be isolated from the low
side of the system in which case the entire system shall be
pressure tested to the low side design pressure.
b. The test pressure after removal of pressure source shall be
maintained for at least 1 hour with no decrease of pressure
indicated by the test gauge, with test gauge resolution not
exceeding 5% of the test pressure.
c. During the evacuation test, after achieving a vacuum level
specified in the manual or less, the refrigeration system shall be
isolated from the vacuum pump and the pressure shall not rise
above 1500 microns within 10 minutes. The vacuum pressure
level shall be specified in the manual, and shall be the lessor of
500 microns or the value required for compliance with national
and local codes and standards, which may vary between
residential, commercial, and industrial buildings.
–field-made refrigerant joints indoors shall be tightness tested
according to the following requirements: The test method shall
have a sensitivity of 1/8 oz (5g)/year of refrigerant or better under
a pressure of at least 125% of the maximum allowable pressure.
No leak shall be detected.
3. Qualification of workers
Any maintenance, service and repair operations must be required
qualification of the working personnel. Every working procedure
that effects safety means shall only be carried out by competent
persons that joined the training and achieved competence should be
documented by a certificate. The training of these procedures is
carried out by national training organizations or manufacturers that
are accredited to teach the relevant national competency standards
that may be set in legislation. Examples for such working procedures
are:
• breaking into the refrigerating circuit;
• opening of sealed components;
• opening of ventilated enclosures.
Information 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
Works 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.
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 is suitable for use with flammable refrigerants (no
sparking, adequately sealed, or intrinsically safe).
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