35
Piping work connection considerations
SMGB0066 rev.0 - 12/2009
Water pipe
installation
Service Manual
2
5
1
1
3
4
4
2
3
Pressure gauge
Strainer
Flexible joint
Valve
Check valve
caution
Malfunction. Damage by clogging.
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This product is equipped with plate heat exchanger type. In the heat exchanger, water flows through a narrow
-
space between the plates. Therefore, there is a possibility that freezing may occur if foreign particles or dust
are clogged. In order to avoid this clogging, mesh water strainer shall be installed in the water inlet pipe and
as close as possible to the plate heat exchanger. In case of punching metal type strainer, mesh hole size shall
be Ø 1.5mm or less.
Never use the salt type antifreeze mixture, since it possesses strong corrosion characteristics, and water
-
equipment might be damaged.
When connecting several units to a common pipe, its design should ensure that the water flow on each unit is
-
the same (see below figure). Imbalance of water distribution may cause a serious damage like water freezing
in the plate heat exchanger.
Yutaki unit
Indoor
installation
(heating
elements)
Working condition
Pressure range
0 MPa ~ 1.0 MPa
Water temp. range
- 20ºC ~ 90ºC
Pressure range of
water main
0.17~ 0.2 MPa
2.2. PIPInG WorK ConnECTIon ConSIdErATIonS
2.2.1. Minimum water volume description
necessity of water in system and summary of its calculation
•
The following problems may occur when the quantity of water in the forced circulation system
(1)
on water side is insufficient.
Compressor in operation repeats numerous "start/stop" when light-loaded, which may result in shorter life or failure.
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Low temperature in water circulation during defrost operation, which may cause an alarm (freeze protection) at the stop
-
of the unit.
