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Installation of Indoor Unit
1. Information for Refrigerant
※ In case one refrigerant facility is divided into 2 or more refrigerant systems and each system is independent, amount of
replenished refrigerant of each system shall be adopted.
(2) Calculate the volume of the room where indoor unit is installed as single room or the smallest room. (D, m³)
In case of room with partition and without opening which serve as passage of air to adjoining room, calculate the room
space only.
- In case of room with partition but opened which serve passage of air to adjoining room, calculate the room space include
space of adjoining room. (In the case of opening without door, or openings both above and below door which is more than
space 0.15 % to floor space)
(3) Calculate refrigerant concentration.
Refrigerant concentration
= Total amount of refrigerant system (A, kg) ÷ Volume of smallest room where indoor unit is installed (D, m³)
[ Refrigerant concentration ≤ Maximum concentration (kg/m³, R410A is 0.44) ]
In case the result of calculation exceeds the concentration limit, perform the same calculations by shifting to the second
smallest, and the third smallest rooms until at last the result is below the concentration limit.
■ In case the concentration exceeds the limit
When the concentration exceeds the limit, change original plan or take one of the counter measure shown below:
- Counter measure 1
Provide opening 0.15% or more size of opening to floor space both above and below door for ventilation,
or provide opening without door.
- Counter measure 2
Provide gas leak alarm linked with mechanical ventilator.
- Counter measure 3
Reducing the system's refrigerant quantity by deviding into smaller separate system.
< ! > CAUTIONS
Pay a special attention to the place, such as a basement, etc. where refrigerant can stay, since refrigerant is heavier
than air.
3
Installation
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