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MEES18K085

SAF

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NDLIN

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R R32

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5. Regulatory requirements list for safety measures

SAFETY HANDLING FOR R32

<Regulatory requirements for refrigerant leakage detector>

<Regulatory requirements for circulation airflow>

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>

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

/h <IEC/GG.10.2.1>

3)

Minimum air velocity
vmin = (–4.0 × 10

-5

 × M

2

 + 0.0108 × M + 1.42) / sin ø <IEC/GG.10.2.1>

* 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>

0000005090.BOOK  14 ページ  2018年12月27日 木曜日 午前10時3分

Содержание HYBRID CITY MULTI Series

Страница 1: ... 2 Confirm the Critical concentration and take countermeasure 2 2 Installation restrictions 3 2 1 Installing the outdoor unit or the Hydro unit outdoor 3 2 2 Installing the Hydro unit or the HBC indoor 5 3 Installation flow chart 6 4 Installation chart annex 10 5 Regulatory requirements list for safety measures 13 0000005090 BOOK 1 ページ 2018年12月27日 木曜日 午前10時3分 ...

Страница 2: ...ration Rmax is over 0 063kg m3 If no then the HYBRID CITY MULTI is safe against refrigerant leakage If yes following countermeasure is recommended to do at site Countermeasure 1 Smaller total charge making Wmax smaller e g Avoid connecting more than 1 Outdoor unit to one room e g Using smaller model size but more Outdoor units e g Shorten the refrigerant piping as much as possible Note 1 In princi...

Страница 3: ...the base it may reach a flammable concentration in case the room is small To avoid ignition maintain a safe work environment by ensuring appropriate ventilation If the refrigerant leaks in a room or an area that has insufficient ventilation refrain from using flames until the work environment is improved by ensuring appropriate ventilation Do not install the outdoor unit in a basement or machinery...

Страница 4: ... m Height from the ground to an opening 0 125 m Width of an opening 0 9 m Longitudinal direction Example space with a louver A Amin M kg 10 20 30 40 50 60 112 223 334 445 556 667 Amin m2 Install the unit in a space with an installation area of Amin or more corresponding to the refrigerant amount M M factory charged refrigerant refrigerant to be added on site Secure sufficient installation space mi...

Страница 5: ...ed quantity of safety measures height of ceiling space 1 8 m 0 10 20 30 40 50 60 70 80 0 50 100 150 200 250 300 350 400 450 500 550 600 650 SyStem refrigerant amount kg NG ISO 5149 At least two safety measures are required At least one safety measure is required Construction guidance Room volume m3 Do not place an ignition source in a space where Hydro unit HBC is installed or adjacent spaces not ...

Страница 6: ...n equipment is NOT placed in the space where Hydro unit HBC is installed Hydro unit HBC is installed at the height of 1 8m or higher Hydro unit HBC is installed on the ceiling of a space except on the lowest basement floor Alarm required by applicable regulations is installed additionally START START Installation OK Installation OK 1 Machinery room installation Continuous ventilation Machinery roo...

Страница 7: ...ed additionally Small room installation Installation not allowed Installation not allowed Installation not allowed Installation not allowed Installation OK Installation OK 4 Small room installation Alarm Shut off valves NEXT PAGE NO NO NO Refrigerant concentration determination IEC GG 10 4 GG 10 5 ISO part1 A 5 2 2 A 5 2 3 Installation OK Installation OK 5 Installation on ceiling Alarm Ventilation...

Страница 8: ...the refrigerant concentration is less than 0 063 kg m3 when refrigerant leaks Hydro unit HBC is installed in the space where the refrigerant concentration is less than 0 16 kg m3 when refrigerant leaks Hydro unit HBC is installed in the space where the refrigerant concentration is less than 0 16 kg m3 when refrigerant leaks Two safety measures alarm and shut off valves required by applicable regul...

Страница 9: ...ionally 12 Ceiling space installation Circulation Alarm Ventilation NO NO 15 Small room installation Circulation Mechanical ventilation Mechanical ventilation requirement IEC GG 11 3 ISO part3 6 3 3 NO YES YES YES Two safety measures alarm and ventilation required by applicable regulations are installed additionally Two safety measures shut off valves and ventilation required by applicable regulat...

Страница 10: ...m Unoccupied space not designated a machinery room Unoccupied space not designated a machinery room 3 Small room installation Alarm 2 Small room installation No safety measures 4 Small room installation Alarm Shut off valves 5 Installation on ceiling Alarm Ventilation Height 1 8m Height 1 8m Height 1 8m Height 1 8m Height 1 8m Height 1 8m Leak detector alarm Leak detector alarm Alarm Hospital etc ...

Страница 11: ...rculation 10 Small room installation Circulation Alarm 11 Small room installation Circulation Alarm Shut off valves Unoccupied space not designated a machinery room Unoccupied space not designated a machinery room Unoccupied space not designated a machinery room Alarm Hospital etc Alarm Hospital etc Alarm Hospital etc Unoccupied space not designated a machinery room 8 Small room installation Mecha...

Страница 12: ...rm Supervised location Supervised location Supervised location Alarm Hospital etc Alarm Hospital etc Alarm Hospital etc Concentration check Concentration check Concentration check Concentration check Height 1 8m Height 1 8m Height 1 8m Height 1 8m Height 1 8m Height 1 8m 14 Small room installation Circulation Shut off valves 15 Small room installation Circulation Mechanical ventilation 12 Ceiling ...

Страница 13: ... 6 4 1 5 Safety shut off valve shall shut off the refrigerant under the control of refrigerant leakage detector ISO 1 A 5 2 1 ISO 3 6 4 1 6 The air conditioner and safety shut off valve shall use different electrical power supply ISO 3 7 2 1 Mechanical ventilation shall be operated continuously or be switched on by the refrigerant detection system IEC GG 11 3 4 ISO 3 6 3 3 3 2 During the continuou...

Страница 14: ...te 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 replac...

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