Hitachi YUTAKI S COMBI Series User Manual

Heating coil pipes for the indoor unit
Item Connection
~500 mm To connect to the 3-way valve heating coil inlet connection.
~400 mm To connect to the T-branch heating coil outlet connection.
Heating coil pipes for the DHW tank accessory
Item Connection
(1")
(x2)
360 mm
(1")
One pipe to connect to the heating coil inlet connection of the tank
accessory.
The other one to connect to the heating coil outlet connection of the tank
accessory.
YUTAKI M
(inches)
Model
Space heating pipes connection
Inlet connection Outlet connection Shut-off valves
3.0HP G 1” (female) G 1” (female)
G 1” (male) -
G 1” (male)
(4.0-6.0)HP G 1-1/4” (female) G 1-1/4” (female)
G 1-1/4” (male) -
G 1-1/4” (male)
6.1.4 Water quality (Preliminary information)
! CAUTION
• Water quality must be according to EU council directive 98/83 EC.
• Water should be subjected to ltration or to a softening treatment with chemicals before application as treated water.
• It is also necessary to analyse the quality of water by checking pH, electrical conductivity, ammonia ion content, sulphur content, and others. Should
the results of the analysis be not good, the use of industrial water would be recommended.
• No antifreeze agent shall be added to the water circuit.
• To avoid deposits of scale on the heat exchangers surface it is mandatory to ensure a high water quality with low levels of CaCO
3
.

Recommendations for the DHW circuit
The following is the recommended standard water quality.
Item
DHW space Tendency
(1)
Water supplied
(3)
Corrosion Deposits of scales
Electrical Conductivity (mS/m) (25°C)
{µS/cm} (25 °C)
(2)
100~2000
Chlorine Ion (mg CI¯/I) max 250
Sulphate (mg/l) max 250
Combination of chloride and sulphate (mg/l) max 300
Total Hardness (mg CaCO
3
/I) 60~150
? NOTE
• (1): The mark “ ” in the table means the factor concerned with the tendency of corrosion or deposits of scales.
• (2): The value shown in “{}” are for reference only according to the former unit.
• (3): Water range will be according s/UNE 112076:2004 IN.
6.1.5 Water ow control
YUTAKI pumps can estimate the water ow by electronic calculation. Therefore, there is no need to install a water ow switch with
the new YUTAKI pumps.
However, if a secondary pump is installed or glycol is used (in the case of YUTAKI M), it is necessary to install a water ow control,
as the electronic calculation may be affected.
REFRIGERANT AND WATER PIPING
PMML0335A rev.1 - 04/2016
90

Hitachi YUTAKI S COMBI Series Specifications

General

Brand	Hitachi
Model	YUTAKI S COMBI Series
Category	Heat Pump
Language	English