Hydraulic Circuit; General Notes - Hitachi YUTAKI Series Installatie- En Bedieningshandleiding
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HYDRAULIC CIRCUIT
8.2 PLACE PROVISION
Drill 2 holes Ø 8mm on the wall for fixing WEH according to the dimensions of the Wall Support attached.
Fixed supplied support to the wall by using previous drill holes.
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Use attached screws for fixing WEH to the supplied support.
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Check that WEH are installed horizontally.
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For cleaning, use non flammable and non toxic cleaning liquid. The use of flammable agents should cause explosion or fire.
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Cleaning liquid shall be collected after cleaning.
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Pay attention do not trapp cables when closing the electrical box cover. It could cause a electric shock.
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9 HYDRAULIC CIRCUIT
9.1 GENERAL NOTES
When Piping connections are performed:
1 Connect all pipes as close as possible to the unit, so that
disconnection can be easily performed when required.
2 It is recommended to use flexible joints for the piping of water
inlet and outlet, so vibration will not be transmitted.
3 Whenever possible, sluice valves should be installed for
water piping, in order to minimise flow resistance and to
maintain sufficient water flow.
4 It is recommended to apply ball valves in both water pipe
connections to make easier any maintenance work.
5 Proper inspection should be performed to check for leaking
parts inside and outside the system, by completely opening
the hot water inlet and outlet valves to the water condenser.
6 This WEH must be fully air purged to avoid heating elements
radiating the tank case without water.
Install WEH as shows on the following drawing in order to
allow a natural purge on the WEH (inlet pipe in the bottom
side, and outlet pipe in the upper side, both vertically
oriented).
It is recommended to install an air purge after outlet piping in
5
PMML0199A rev.4 - 12/2016
the highest position of the hydraulic installation.
Previous recommendation is a must when there are other
parts of hydraulic system that could be installed in a higher
position than WEH.
7 Apply thermal insulation on the hydraulic system pipes in
order to avoid accidental injure due to excessive heat on
piping surfaces and also to avoid heat losses.
8 When the unit is stopped during shutdown periods and
the ambient temperature is very low, it is possible that the
water in the pipes and in the circulating pump freeze, thus
damaging the pipes and the water pump.
In order to prevent this, during shutdown periods it is useful to
empty the water from the installation.
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N O T E
In cases where water drainage is difficult, an antifreeze mixture of gly-
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col (ethylene or propylene) should be used (content between 10 % and
40 %).(Only for YUTAKI M).
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The performance of the unit working with glycol may decrease in pro-
portion to the percentage of glycol used, since the density of glycol is
higher than that of water.
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