Hitachi YUTAKI S80 Serie Manual De Instrucciones página 16

REFRIGERANT AND WATER PIPING
4.1.2 Additional hydraulic optional elements (For DHW)
In case of a recirculation circuit for the DHW circuit:
• 1 Recirculation water pump (field supplied): this water pump (3) will help to correctly recirculate the hot water to the DHW
inlet.
• 1 Water check valve (ATW-WCV-01 accessory): this Hitachi accessory (4) is connected after the recirculation water pump (31)
in order to ensure the non-return of water.
• 2 Shut-down valves (field supplied) (5): one before the recirculation water pump (3) and other after the water check valve
accessory (4).
4.1.3 Requirements and recommendations for
the hydraulic circuit
• The storage capacity of the tank has to meet with the daily
consumption in order to avoid stagnation of water.
• Fresh water must circulate inside the DHW tank water
circuit at least one time per day during the first days after
the installation has been performed. Additionally, flush the
system with fresh water when there is no consumption of
DHW during long periods of time.
• Try to avoid long runs of water piping between the tank
and the DHW installation in order to decrease possible
temperature losses.
• When using the indoor unit in combination with the YUTAKI
S80 DHW tank, the heating coil of the tank is placed in a
higher position than the indoor unit air purger. Then, to totally
purge the space heating circuit, it is very important that the
heating coil of the tank is fully air purged.
• lf the domestic cold water entry pressure is higher than the
equipment's design pressure (6 bar), a pressure reducer
must be fitted with a nominal value of 7 bar.
• Ensure that the installation complies with applicable
legislation in terms of piping connection and materials,
hygienic measures, testing and the possible required use of
some specific components like thermostatic mixing valves,
Differential pressure overflow valve, etc.
• Make sure that all field supplied components installed in the
piping circuit can withstand the water pressure and the water
temperature range in which the unit can operate.
• Do not add any type of glycol to the water circuit.
8 PMML0344B rev.0 - 04/2016
All manuals and user guides at all-guides.com
Type
Piping connections
Accessories
Field supplied
4.1.4 Water filling

Fill the DHW tank heating coil from the space heating circuit
filling in point. Follow the instructions explained in the
Space heating and DHW"
operation.
!
•
•
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1 Open the outlet water taps of the DHW installation one after
2 Open the main DHW inlet valve in order to fill the tank. If
3 When water begins to flow from the outlet water taps of the
4 Finally, close the main DHW inlet valve when the pressure
!
•
•
•
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Nº Part name
1 Water inlet (DHW)
2 Water outlet (DHW)
Water check valve
3
(ATW-WCV-01 accessory)
4 Water pump
5 Shut-off valve
Heating coil circuit
chapter to correctly perform the
C A U T I O N
Check that the heating coil pipes are correctly connected between
indoor unit and tank before filling the tank's heating coil.
Ensure the correct water quality of the indoor unit water circuit.
Domestic hot water tank and DHW circuit
each other, to expel all the air from inside the water circuit.
there is a shut-off valve installed in the DHW outlet, open it
to allow circulation through the DHW installation.
DHW installation, close all these taps.
reaches approximately 6 bars.
C A U T I O N
Check carefully for leaks in the water circuit, connections and circuit
elements.
Check that the water pressure in the circuit is lower than 7 bars.
A pressure and temperature relief valve should be installed at the
DHW inlet connection of the tank. If it is the case, manually operate its
relief valve to ensure that the water flows free through the discharge
pipe.
Fill in the circuit with tap water. The water in the heating installation
must comply with EN directive 98/83 EC. Non-sanitary controlled
water is not recommended (for example, water from wells, rivers,
lakes, etc.).
"4.1