Water Quality (Preliminary Information) - Hitachi YUTAKI Series Instruction And Operation Manual

REFRIGERANT AND WATER PIPING
(1")
YUTAKI M
Model
3.0HP
(4.0-6.0)HP

6.1.4 Water quality (Preliminary information)

!
C A U T I O N
• Water quality must be according to EU council directive 98/83 EC.
• Water should be subjected to filtration 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

Recommendations for the DHW circuit
The following is the recommended standard water quality.
Item
Electrical Conductivity (mS/m) (25°C)
{µS/cm} (25 °C)
(2)
Chlorine Ion (mg CI¯/I)
Sulphate (mg/l)
Combination of chloride and sulphate (mg/l)
Total Hardness (mg CaCO /I)
3
?
N O T E
• (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 flow control
YUTAKI pumps can estimate the water flow by electronic calculation. Therefore, there is no need to install a water flow 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 flow control,
as the electronic calculation may be affected.
90 PMML0335A rev.1 - 04/2016
Heating coil pipes for the indoor unit
Item
~500 mm
~400 mm
Heating coil pipes for the DHW tank accessory
Item
360 mm
(1")
(x2)
Inlet connection
G 1" (female)
G 1-1/4" (female)
To connect to the 3-way valve heating coil inlet connection.
To connect to the T-branch heating coil outlet connection.
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.
Space heating pipes connection
Outlet connection
G 1" (female)
G 1-1/4" (female)
DHW space
Water supplied
(3)
100~2000
max 250
max 250
max 300
60~150
Connection
Connection
Shut-off valves
G 1" (male) -
G 1" (male)
G 1-1/4" (male) -
G 1-1/4" (male)
3
Tendency
(1)
Corrosion Deposits of scales
(inches)
.