Hitachi DHWT200E-2.5H1E Manual De Instalación Y Funcionamiento página 22

17 1 Safety summary & control device setting
17 SAFETY SUMMARY & CONTROL DEVICE SETTING
Protection:

This switch cut out the operation on the DHWT when the water temperature inside DHWT exceed 90ºC.
Cut-Out
Contactors
Current
Voltage
Coil Voltaje
Electric Power
Voltage
ø
Resistances whole fixing flare nut
Specific heat load
Material
Resistance cord
Sensor
DHWT sensor
18 GENERAL STANDARD FOR HYDRAULIC INSTALLATION
• The safety valve unit will fitted at the sanitary water installa-
tion.
• A pressure reducer must be placed in the DHWT installation.
The nominal pressure of the safety unit will be 8 bar.
• When the main pressure is more than 6 bar a pressure redu-
cer should be installed.
• The water discharge during heating (expansion) is normal.
The volume of this discharge can be up to 3% of the storage
tank's capacity.
• The pressure regulator device must be working regularly, de-
pending on the quality of water, in order to remove the lime's
deposits and verify that it is not blockade.
• A water leakage in the pressure protection device can exist.
The discharge pipe should be always open to the atmosphe-
re, free of frost and in continuous slope to the down side.
• Dielectric bushes must be fitted at the input and output sani-
tary water and at the tank circuit connections.
• Emptying the DHWT: Close the main inlet water valve and
open the relief valve of the security water group.
22
Model
Thermostat
Heating resistances
PMML0198A-rev.1 - 04/2011
Units DHWT
Manual Reset
ºC 90
A 20 (AC1)
V 230V
V 207~253V
kW 2.5
V 230V
mm 8
"G 2 (brass)
W/cm 8
²
iNCOLLOY 825
Ni-Cr 80/20 ø 0.45mm
NTC 20k
Ref.
Main inlet water

DHWT inlet connection

Security valve and manual empty

Emptying connection

Check valve

Close valve

1
6
4
Name
2
5
3