Hitachi YUTAKI S COMBI Series Instruction Manual page 24

REFRIGERANT AND WATER PIPING
4.3 R32 REFRIGERANT CIRCUIT
4.3.1 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.
4.3.2 Refrigerant piping

Refrigerant piping length between indoor unit
and outdoor unit
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 (2/2.5HP) / 27m (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)
Outdoor unit higher than
indoor unit
Indoor unit higher than
outdoor unit
6 PMML0573 rev.1 - 07/2021
2HP 2.5HP 3HP
kg 1.20 1.30 1.30
m 10 10 10
g/m 15 15 30
m 30 30 27
kg 1.50 1.60 1.81
No requirement is
m
2
needed
m 3
30 (2/2.5 HP)
m
27 (3 HP)
m 20
In case of increasing more than 30m (2/2.5HP) / 27m (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)
Outdoor unit higher
than indoor unit
Indoor unit higher
than outdoor unit
?
N O T E
(*) In case of 3HP with piping length >27m, refrigerant piping diameter
and additional charge quantity must be considered.

Minimum area requirements
In case of total refrigerant amount ≥1.84 kg, the unit should be
installed, operated and stored in a room with a floor area larger
than the minimum criteria. Use following graphic and table to
determine these minimum criteria:
Refrigerant Amount (kg)
1.84
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2HP 2.5HP 3HP (*)
kg 1.20 1.30
m 10 10
g/m 15 15
m 50 50
kg 1.80 1.90
No
Minimum area
m requirement
2
is required
is needed
m 3
m 30
m 20
Minimum Area (m ) (H:2.2m)
2
28.81
30.72
34.09
37.50
41.36
45.00
49.09
53.18
57.73
61.82
66.82
71.36
1.30
10
30
40
2.20