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.
• 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.
• 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 5 g/
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. Detachable joints shall NOT be used in the
indoor side of the unit (brazed, welded joint could be used).
• In cases that require mechanical ventilation, ventilation openings shall
be kept clear of obstruction.
2. When 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 can not 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 h 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 5 grams per year of refrigerant or better
under a pressure of at least 0,25 times the maximum allowable
pressure. No leak shall be detected.
-- Any servicing shall be performed only as recommended by
the manufacturer.
3. Qualification of workers
Any maintenance, service and repair operations must be required
qualification of the working 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. All
training shall follow the ANNEX HH requirements of UL 60335-2-40 4th
Edition.
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 being used is suitable for use
with flammable refrigerants, i.e. no sparking, adequately sealed or
intrinsically safe.
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