Johnson Controls (H,Y)VAHP072B31CW, Installation And Maintenance Manual

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1. Maximum Permissible Concentration of HFC GAS R410A
The refrigerant R410A is an incombustible and non-toxic gas.
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concentration of HFC gas, R410A in air is 0.019 lbs/ft
3
(0.3 kg/m
3
), according to the refrigeration and air
conditioning facility standard (KHK S 0010) by the KHK (High Pressure Gas Protection Association) Japan.
Therefore, some effective measure must be taken to lower the R410A concentration in air below
0.019 lbs/ft
3
(0.3 kg/m
3
), in case of leakage.
As for R410A, this consideration is applied similarly.
2. Calculation of Refrigerant Concentration
(1) Calculate the total quantity of refrigerant R (lbs) charged into the system connecting all the indoor units,
rooms.
(2) Calculate the room space where this unit is to be installed V (ft
3
) of each room.
(3) Calculate the refrigerant concentration C (lbs/ft
3
) of the room according to the following equation.
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R: Total Quantity of Charged Refrigerant (lbs)
V: Room Space Where This Unit Is to Be Installed (ft
3
)
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3
(0.3 kg/m
3
) *
Ɣ Special Attention Regarding Refrigerant Gas Leakage
Pay attention to the critical gas concentration to avoid accidental refrigerant gas leakage before
installing air conditioning systems.
< Critical Concentration (lbs/ft
3
)
Totally Charged Refrigerant Quantity in System (lbs)
Room Space for each Indoor Unit (ft
3
)
0.019 lbs/ft
3
(0.3 kg/)m
3
)
If the calculated critical concentration is higher than 0.019 lbs/ft
3
(0.3kg/m
3
), take the following actions:
1) Provide a gas leakage detector and exhaust fan(s) controlled by its gas leakage detector.
2) Provide each effective opening at the wall or door for ventilation to next door so that the critical gas
concentration can be maintained lower than the above value.
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*
* In case of KHK S 0010, this value should be decided according to each country’s regulation.
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Wait for at least three minutes after turning OFF the No.4 pin of DSW5 OFF and then the outdoor unit
is ready to run.
NOTE:
During the check of refrigerant quantity operation, the 7-segment display may change over to display
the protection control code by the activation of protection control. However, this is normal. As for the
protection control code, refer to the spec sheet attached to the inside of the outdoor unit service cover.