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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 certi cate from an industry-accredited
assessment authority, which authorizes their competence to handle refrigerants
safely in accordance with an industry recognised assessment speci cation.
- 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
ammable 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.
competent persons.
- Appliance shall be stored in a well-ventilated area where the room size
corresponds to the room area as speci c for operation.
- Joints shall be tested with detection equipment with a capability of 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. 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.
- 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 an 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 cannot be repaired and can only be replaced by the
manufacture. It shall only be replaced with the sensor speci ed by the
manufacture. (Applicable to the units with refrigerant sensors only)
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 eld
joints shall be accessible for inspection prior to being covered or enclosed.
- that protection devices, piping, and ttings shall be protected as far as
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 oor area of the room shall be mentioned in the form of a table
or a single gure without reference to a formula;
- after completion of eld piping for split systems, the eld 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
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