Hitachi YUTAKI M RASM-2VRE Instruction Manual page 22

DRAIN PIPING
?
N O T E
• Do not use this drain boss set in a cold area, because the drain water
may freeze.
• This drain boss is not sufficient to collect all the drain water. If
collecting drain water is completely required, provide a drain-pan that
is bigger than the unit base and install it under the unit with drainage.
Drain hole
100mm
Plastic cap
Plastic cap
Push
Push
≥ O.D. ∅ 15mm
9.2 SPACE HEATING AND DHW
!
D A N G E R
Do not connect the power supply to the unit prior to filling the space
heating circuit (and DHW circuit if it were the case) with water and
checking water pressure and the total absence of any water leakage.
9.2.1 Additional hydraulic necessary elements
for space heating
Nature Nº
1
Piping connections
2
Field supplied 3
Accessories 4
Field supplied 5
The following hydraulic elements are necessary to correctly
perform the space heating water circuit:
• Two shut-off valves (field supplied accessory) (3) must
be installed in the unit. One at the water inlet connection (1)
and the other at the water outlet connection (2) in order to
make easier any maintenance work.
• A water check valve (ATW-WCV-01 accessory) (5) with 1
shut-off valve (field supplied) (4) must be connected to the
water filling point when filling the unit. The check valve acts
as a safety device to protect the installation against back
pressure, back flow and back syphon of non-potable water
into drinking water supply net.
10 PMML0506 rev.1 - 09/2019
Drain hole
Plastic cap
Drain pipe
Part name
Water inlet (Space heating)
Water outlet (Space heating)
Shut-off valve (field supplied)
Water check valve
(ATW-WCV-01 accessory)
Shut-off valve
9.2.2 Additional hydraulic necessary elements
for DHW
Nature Nº
1
2
3
Piping connections
4
5
6
Field supplied 7
8
Accessories
9
10
Field supplied
11
YUTAKI M is not factory-supplied ready for DHW operation,
but it can be used for the production of DHW if the following
elements are installed:
• A domestic hot water tank (DHWT-(200/260)S-3.0H2E
accessory) (8) has to be installed in combination with the
unit.
• A 3-way valve (ATW-3WV-01 accessory) (9) must be
connected at one point of the water outlet pipe of the
installation.
• A T-branch (field supplied) (10) must be connected at one
point of the water inlet pipe of the installation.
• Two water pipes (field supplied) (11). One pipe between
3-way valve and the heating coil inlet (3) of the DHW tank,
the other one between the T-branch and the heating coil
outlet (4) of the DHW tank.
Part name
Water inlet (Space heating)
Water outlet (Space heating)
Heating coil inlet
Heating coil outlet
Water inlet (DHW)
Water outlet (DHW)
Shut-off valve (field supplied)
Domestic hot water tank
(DHWT-(200/300)S-3.0H2E
accessory)
3-way valve
(ATW-3WV-01 accessory)
T-branch
Heating coil pipes