Hydraulic Circuit - Hitachi DHWT-200S-3.0H2E Bedienungsanleitung

HYDRAULIC CIRCUIT

7.3 WATER SUPPLY CONTROL WARRANTY
Well water or river water could, in most cases, contain suspended solid matter, organic matter, and scales in big quantities.
Therefore, the water should be subjected to a filtration process or to a softener treatment by using chemical products before it's
application as a DHWT water.
It is also necessary to analyse the quality of the water by checking pH, electrical conductivity and others.The following is the
recommended standard water quality:
?
N O T E
Water range will be according s/UNE 112076:2004 IN.
8 HYDRAULIC CIRCUIT
When Piping connections are performed:
1 Connect all pipes as close as possible to the unit, so that
disconnection can be easily performed when required.
2 It is recommended to use flexible joints for the piping of
water inlet and outlet, so vibration will not be transmitted.
3 Whenever possible, sluice valves should be installed for
water piping, in order to minimise flow resistance and to
maintain sufficient water flow.
4 It is recommended to apply ball valves in both water pipe
connections to make easier any maintenance work.
5 Proper inspection should be performed to check for leaking
parts inside and outside the system, by completely opening
the hot water inlet and outlet valves to the water condenser.
6 This DHWT must be fully air purged to avoid heating
elements radiating the tank case without water.
7 Apply thermal insulation on the hydraulic system pipes in
order to avoid accidental injure due to excessive heat on
piping surfaces and also to avoid heat losses.
8 When the unit is stopped during shutdown periods and
the ambient temperature is very low, it is possible that the
water in the pipes and in the circulating pump freeze, thus
damaging the pipes and the water pump. In order to prevent
this, during shutdown periods it is useful to empty the water
from the installation.
?
N O T E
Check periodically:
• Water flow and pressure
• Water leakage's
• Fixing points tightening
!
C A U T I O N
• Inlet and outlet connection pipes must be 1G"
• It must be kept the water flow direction indicated in previous drawing.
7 PMML0347B rev.1 - 06/2016
Item
Chlorine Ion (mg C1¯/1)
Electrical Condutivity (µs/cm)
Total Hardness (mg CaCO3/1)
Solphate content (mg/l)
DHWT Supply Water
Less than 150
100~2000
60~150
max 250
3
5
8
1 Sanitary safety valve unit
2 Non-return valve
3 Water outlet 2
4 Recirculation pump
5 Shutoff cock
6 Drain
7 Purge (Air)
8 Heating coil
H.S.W.
5
4
Recirculation
2
5
7
5
Input
1
5
Return
Mains
6
water input