37MARAQ: Installation Instructions
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.
The installation of pipe-work shall be kept to a minimum.
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. When storing the piping, securely seal the opening by
pinching, taping, etc. All working procedure that affects safety
means shall only be carried by competent persons.
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
displays a error code and emit a buzzing sound, the compressor of
outdoor unit immediately stops, and the indoor fan starts running.
The service life of the refrigerant sensor is 15 years. When the
refrigerant sensor malfunctions, the indoor unit displays the error
code FHCC. Refer to the error code table in the unit’s service
manual for details. 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 refrigerant charge 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 is 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 pipe-
work shall be pressure tested with an inert gas and then vacuum
tested prior to refrigerant charging, according to the following
requirements:
a. The required nitrogen test pressure is 500 PSI.
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 min. 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 (5 g) per 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 performed
by skilled and authorized personnel. Every working procedure that
affects 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.
4. 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.
5. Cabling
Check that cabling is not subjected 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.
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