Hitachi YUTAKI S COMBI Serie Manual De Instrucciones página 21

REFRIGERANT AND WATER PIPING
4.3.3 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 (4) will help to correctly recirculate the hot water to the DHW
water inlet.
• 1 Water check valve (ATW-WCV-01 accessory): this Hitachi accessory (3) is connected after the recirculation water pump (4)
in order to ensure the non-return of water.
• 2 Shut-down valves (field supplied) (5): one before the recirculation water pump (4) and other after the water check valve
accessory (3).
4.3.4 Additional hydraulic necessary elements for DHW (only for UK market)
The following accessories are necessary for the compliance of the YUTAKI S Combi for UK market with the UK requirements
referred in the UK Building Regulations 2000.
• 1 temperature and pressure relief valve (factory supplied), fitted at the hottest part of the DHW tank. This device protects
the unit of excessive temperature (>96º C) and excessive pressure (>7 bar) in the DHW tank. Additionally, a Ø15 diameter pipe
(factory supplied)is fitted to the outlet of the relief valve and drives the discharge to the tundish (4).
• 1 tundish(4)(field supplied), installed in a vertical position, with no more than 600 mm of pipe between the valve outlet and the
tundish.
• 1 Tundish outlet pipe (2)(field supplied) with a vetical section at least 300 mm long below the tundish(4), before any elbows or
bends in the pipework. This pipe should be made of metal or other material that has been demonstrated to be capable of safety
withstanding temperatures and pressure of the water discharged, as it is refferred in the UK Building Regulations.
• The discharge pipe from the tundish (2) must terminate in a safe place where is no risk to persons in the vicinity of the discharge.
The discharge will consist of high water temperature and pressure.
11 PMML0338B rev.1 - 03/2016
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Piping connections
Accessories
Field supplied
Nature
Piping connections
Accessories
Field supplied
Nature Nº Part name
1 Water inlet (DHW)
2 Water outlet (DHW)
Water check valve
3
(ATW-WCV-01 accessory)
4 Water pump
5 Shut-down valve
Nº Part name
T&P relief valve outlet pipe Ø15
1
(factory supplied)
2 Tundish outlet pipe (Field supplied)
Pressure and Temperature relief valve
3
(Factory supplied)
4 Tundish (Field supplied)
5 Drain (Field supplied)