Hitachi YUTAKI S Series Technical Catalogue page 105

8 Refrigerant and water piping
Refrigerant circuit
8.2 Refrigerant circuit
8.2.1 General notes R32 refrigerant
This appliance is filled with R32, an odourless flammable refrigerant gas with low burning velocity (A2L class pursuant to
ISO 817). If the refrigerant is leaked, there is a possibility of ignition if it enters in contact with an external ignition source.
Make sure that unit installation and refrigerant piping installation comply with applicable legislation in each country. Also,
in Europe, EN378 must be complied, as it is the applicable standard.
8.2.2 Refrigerant piping

Refrigerant piping length between indoor unit and outdoor unit (For YUTAKI (S/S COMBI))
The unit installation and refrigerant piping should comply with the relevant local and national regulations for the designed
refrigerant.
Due to R32 refrigerant and depending on final refrigerant charge amount, a minimum floor area for installation must be
considered.
• If total refrigerant charge amount <1.84kg, there are no additional minimum floor area requirements.
• If total refrigerant charge amount ≥1.84kg, there are additional minimum floor area requirements to be checked.
New YUTAKI R32 range (2~3HP) due to low refrigerant charge amount and due to low additional charge needed, unit
installation can achieve up to 30m (*27m for 3HP) without any minimum floor area requirement.
Factory Charge
Charge-less piping length
Additional Charge needed
Maximum piping
Maximum total refrigerant charge
Minimum room area requirement (Amin)
Minimum piping length between outdoor unit and indoor unit (Lmin)
Maximum height difference between indoor and outdoor unit (H)
In case of increasing more than 30m (27m for 3HP) a minimum floor area requirement must be considered.
Factory Charge
Charge-less piping length
Additional Charge needed
Maximum piping
Maximum total refrigerant charge
Minimum room area requirement (Amin)
Minimum piping length between outdoor unit and indoor unit (Lmin)
Maximum height difference between indoor and outdoor unit (H)
?
N O T E
(*) In case of 3HP with piping length >27m, refrigerant piping diameter and additional charge quantity must be considered.
97 TCGB0123 rev.2 - 10/2019
Outdoor unit higher than indoor unit
Indoor unit higher than outdoor unit
Outdoor unit higher than indoor unit
Indoor unit higher than outdoor unit
2HP 2.5HP
kg 1.20 1.30
m 10 10
g/m 15 15
m 30 30
kg 1.50 1.60
m No requirement is needed
2
m 3
30 (2/2.5HP)
m
27 (3HP
m 20
2HP 2.5HP
kg 1.20 1.30
m 10 10
g/m 15 15
m 50 50
kg 1.80 1.90
No
Minimum area is
m requirement
2
is needed
m 3
m 30
m 20
3HP
1.30
10
30
27
1.81
8
3HP (*)
1.30
10
30
40
2.20
required