Mitsubishi Electric HYBRID CITY MULTI PURY-M200-300YNW-A Data Book page 69

5. Regulatory requirements list for safety measures
<Regulatory requirements for refrigerant leakage detector>
1) Alarm threshold shall be set to be activated before the refrigerant concentration reaches 25% of the LFL. The LFL shall be
taken at WCF (Worst Case Formulation) as defined in ISO 817. <IEC/LL.1><ISO-3/9.4.2>
2) Refrigerant detection system shall make output signal to activate the safety measures within 30 seconds at the refrigerant
concentration of 25% of LFL or lower. <IEC/LL.2 and 3>
The delay of the detector shall be 30s or less at a concentration of 1.6 times the pre-set value. <ISO-3/9.4.1>
3) The refrigerant detection system, including the sensors, shall comply with the above requirements over the full range of
operating temperature and humidity as specified by the appliance manufacturer. <IEC/LL.3>
The sensitivity tolerance of the detector shall be considered to ensure that the output signal is triggered at or below the
pre-set value. The tolerance of the detector shall take into account the ±10% of power line voltage tolerance.
<ISO-3/9.4.1>
4) The refrigerant detection system shall be pre-set and calibrated (with an accuracy of ±20%) from the factory for the refrigerant
used. <IEC/LL.4>
The pre-set value for the refrigerant detector at 30˚C or 0˚C, whichever is more critical, shall be half or less of the RCL
(Refrigerant Concentration Limit) concentration as given in ISO 817. <ISO-3/9.4.1>
5) Vibration requests <IEC/LL.6>
If vibration operating parameters are not established by the manufacturer, then a sample of the sensor shall be subject to
the requirements defined below.
- frequency 10 Hz-31.5 Hz, total amplitude 1.0 mm, and
- frequency 31.5 Hz-150 Hz, maximum acceleration 2G
The samples shall be vibrated over the specified frequency range, displacement and acceleration for a period of 1 hour in
each of the three mutually perpendicular planes (X-Y-Z). The change rate shall not exceed 10 Hz/min. After the samples are
vibrate, they shall be tested to verify they still sense refrigerant at 25% of LFL or lower.
6) The sensor shall include a means for self-testing, and the test shall be run at least every hour and if a failure is detected, an
alarm shall be activated. <IEC/LL.7>
7) If the sensor has a defined life and requires replacement after a given period, the detection system shall initiate an alarm or
indication that replacement is required. If sensor becomes more sensitive with aging to generate false alarm, the end of life
alarm can be omitted. <IEC/LL.7>
8) The sensors shall be marked with name of manufacturer (or responsible vendor) and model (or type) reference.<IEC/LL.8>
9) The detector shall be located where the refrigerant from the leak will concentrate. <ISO-3/9.2>
10) At least one detector shall be installed in each machinery room and/or at the lowest underground room. <ISO-3/9.2>
11) The detector shall continue to activate the alarm signal if the concentration exceeds the threshold. <ISO-3/9.4.2>
12) The installation of the detector shall allow access for checking, repair, or replacement by an authorized person.
<ISO-3/9.5.1>
13) The detector shall be protected to prevent tampering or unauthorized resetting of the pre-set value. <ISO-3/9.5.2>
14) The air conditioner and refrigerant leakage detector shall use different electrical power supply. <ISO-3/7.2 and 8.2>
<Regulatory requirements for circulation airflow>
1) The circulation shall operate continuously or be turned on by refrigerant detection systems. <IEC/GG.10.2.1>
2) Minimum airflow = 240 m
3) Minimum air velocity
-5
vmin = (–4.0 × 10 × M
* Because of R32 Molecular weight = 52.0 g/mol, vmin ≈ 1.87 m/s
* Reduction of the area due to the outlet grill (= air speed up) is not considered.
4) Where the continuous operation of the fan, the airflow shall be monitored. If the airflow is reduced, the unit operation shall
be stopped, or alarm shall be turned on. <IEC/GG.10.2.2>
5) Where ventilation is activated being interlocked with refrigerant detection system, after the detected value of concentration
reached lower than the pre-set alarm concentration, circulation fan shall continue to run for at least 5 min (at the time of heat-
ing operation) and the unit shall be stopped. <IEC/GG.10.2.3>
MEES18K044
3
/h <IEC/GG.10.2.1>
2
+ 0.0108 × M + 1.42) / sin ø <IEC/GG.10.2.1>
SAFETY HANDLING FOR R32
11