Hitachi YUTAKI S COMBI Series User Manual

ENGLISH
6 REFRIGERANT AND WATER PIPING
6.1 REFRIGERANT CIRCUIT
6.1.1 Refrigerant piping

Refrigerant piping length between indoor unit and outdoor unit (For YUTAKI (S/S COMBI/S80))
The refrigerant piping length between indoor unit and outdoor unit should be designed using the following chart. Keep the design
point within the area of the chart, which is showing the applicable height difference according to piping length.
When outdoor unit is
installed higher than
indoor unit
When outdoor unit
is installed lower
than indoor unit
Height difference (m)
Total length between outdoor
unit and indoor unit.
+H
OU Model
2-3 HP 4-6 HP 8/10 HP
Maximum piping length between outdoor
unit and indoor unit (Lmax)
Actual piping length (L) 50 m 75 m 70 m
Equivalent piping length (X) 70 m 95 m 90 m
Minimum piping length between outdoor
unit and indoor unit (Lmin)
Actual piping length 5 m (*)
Maximum height difference between indoor
and outdoor unit (H)
Outdoor unit higher than indoor unit 30 m
Indoor unit higher than outdoor unit 20 m
? NOTE
(*): If the actual piping length between outdoor and indoor unit needs to be less than 5m, contact with your dealer.

Refrigerant piping size
Piping connection size of outdoor unit & indoor unit
Indoor unit
Model
Pipe size
Model
Pipe size
Gas pipe Liquid pipe Gas pipe Liquid pipe
2 HP
Ø 12.7 (1/2”) (*)
Ø 6.35 (1/4”) 2.0 HP
Ø 15.88 (5/8”) (*)
Ø 6.35 (1/4”)
2.5 HP Ø 6.35 (1/4”) (*) 2.5 HP Ø 9.52 (3/8”) (*)
(3-6) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”) (3.0-6.0) HP Ø 15.88 (5/8”) Ø 9.52 (3/8”)
8 HP
Ø 25.4 (1”)
Ø 9.52 (3/8”) 8 HP
Ø 25.4 (1”)
Ø 9.52 (3/8”)
10 HP Ø 12.7 (1/2”) 10 HP Ø 12.7 (1/2”)
? NOTE
(*): The refrigerant gas piping size for 2/2.5 HP and the refrigerant liquid piping size of 2.5 HP are different between outdoor and indoor unit. Therefore,
refrigerant pipe adapters are required to connect these units. Pipe size must be installed according to the outdoor units. These pipe adapters are factory
supplied with the outdoor unit.
Model
Pipe adapter
Gas pipe Liquid pipe
2 HP Ø15.88→Ø12.7 -
2.5 HP Ø15.88→Ø12.7 Ø9.52→Ø6.35
REFRIGERANT AND WATER PIPING
PMML0335A rev.1 - 04/2016
85

Hitachi YUTAKI S COMBI Series Specifications

General

Type	Air-to-Water Heat Pump
Energy Efficiency Class (Cooling)	A++
Refrigerant	R32
Operating Temperature Range (Heating)	-20°C to 35°C
Energy Efficiency Class (Heating)	A+++
Integrated DHW Tank	190 liters
Dimensions (Indoor Unit)	Varies by model
Dimensions (Outdoor Unit)	Varies by model
Weight (Indoor Unit)	Varies by model
Weight (Outdoor Unit)	Varies by model
Operating Temperature Range (Cooling)	+10°C to +46°C