Panasonic Aquarea WH-UD09JE5-1 - Page 104

104 Aquarea air-to-water heat pumps - Planning and installation manual - 02/2022
Planning
5
Indoor oor area requirement for R32 models
Due to the classication of R32 with regard to safety, toxicity and ammability, limitations regarding
the refrigerant quantity in relation to the oor area must be observed based on the applicable
standards:
● If the total refrigerant charge in the system is <1.84 kg, no additional minimum oor
area is required.
● If the total refrigerant charge in the system is ≥1.84 kg, perform the following steps
to determine, if the room is large enough to install the indoor unit or if any additional
safety measures need to be taken.
Symbol Description Unit
m
c
Total refrigerant charge in system
where:
Total refrigerant charge in system, m
c
(kg) = Pre-charged refrigerant amount in unit (kg)
+ Additional refrigerant amount after installation (kg)
kg
m
max
Maximum allowed refrigerant charge kg
m
excess
Excess refrigerant charge quantity (m
c
– m
max
) kg
A
room
Floor area of the installation room m²
B
room
Floor area of the room adjacent to the installation room m²
H Installation height m
VA
min
Minimum ventilation opening area cm²
A
min total
Minimum required total oor area (A
room
+ B
room
) m²
Step A: Determine the maximum allowed refrigerant charge (m
max
):
1. Calculate the oor area of the installation room (A
room
).
2. Based on Table I (see below), select the maximum allowed refrigerant charge (m
max
), which
corresponds to the calculated A
room
value.
3. If the maximum allowed refrigerant charge is larger than the total refrigerant charge in
the system (m
max
> m
c
), the unit can be installed in the installation room at the installation
height of H = 600 mm, which is specied in Table I, and without additional oor area or any
additional ventilation.
4. If not (m
max
< m
c
), proceed to Step B and Step C, to determine how the oor area of the
installation room (A
room
) can be “enlarged” by the oor area of an adjacent room (B
room
) by
providing su󰀩ciently large ventilation openings between the two rooms.
30.11.2021, cH
Can we name the relevant European standards?