Hitachi RWH-4.0VNFE Instruction Manual page 20

REFRIGERANT AND WATER PIPING
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TYPE 2: Version for operation with HITACHI DHW tank
DHW tank integrated
above the indoor unit
DHW tank beside
the indoor unit
The YUTAKI S80 version for combination with DHW tank (RWH-(4.0-6.0)(V)NFWE) needs the following elements to provide DHW
operation:
• The YUTAKI S80 domestic hot water tank (DHWS(200/260)S-2.7H2E accessory) (10) is required in combination with YUTAKI
S80 indoor unit. This tank accessory is factory-supplied with two flexible water pipes (11). Respect the following instructions
depending on the DHW tank location (integrated above the indoor unit or beside it).
- For DHW tank integrated above the indoor unit, use one of the factory-supplied pipes (11) for the connection between 3-way
valve and the heating coil inlet coil of the DHW tank, and the other one for the connection between the T-branch and the
heating coil outlet coil of the DHW tank accessory.
- For DHW tank beside the indoor unit (both right or left side), the pipes factory-supplied with the DHW tank accessory (11) are
not required. In this case, the dedicated HITACHI flexible water pipe kit (ATW-FWP-02 accessory) (12) is needed. This kit is
provided with the following items:
Š 4 flexible water pipes (Two pipes (12a) to connect to the indoor unit (3-way (8) valve and T-branch (9)) and other two
pipes (12b) to connect to the heating coil inlet/outlet connections of the DHW tank (5-6). To connect the indoor unit with
the DHW tank, two additional field-supplied pipes are required (13).
Š 9 gaskets (2 gaskets for each flexible water pipe end and 1 spare gasket).
Š 3 extension cables (1 for the tank's electric heater, 1 for the tank's thermistor and 1 for the unit controller).
10 PMML0340B rev.1 - 03/2016
Nature Nº
1 Water inlet (Space heating)
2 Water outlet (Space heating)
3 Heating coil inlet
Piping
connections
4 Heating coil outlet
5 Water inlet (DHW)
6 Water outlet (DHW)
7 Shut-off valve (factory-supplied)
Factory supplied 8 3-way valve
9 T-branch
Domestic hot water tank
10 (DHWS(200/260)S-2.7H2E
accessory)
11 Heating coil pipes
Accessories
Flexible water pipe kit
(ATW-FWP-02 accessory)
12
12a Indoor unit pipes
12b DHW tank pipes
Water pipes between indoor unit
Field supplied 13
and DHW tank
Part name