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Installation of Outdoor Unit
5. Water Piping System
5.1 Water piping and water circuit connection
■ General Considerations
Followings should be considered before beginning water circuit connection
• Service space should be secured.
• Water pipes and connections should be cleaned using water.
• Space for installing external water pump should be provided if internal water pump capacity is not enough for installation
field.
• Never connect electric power while proceeding water charging.
■ Water Piping and Water Circuit Connection
1. Definition of terms are as follow :
• Water piping : Installing pipes where water is flowing inside the pipe.
• Water circuit connecting : Making connection between the unit and water pipes or between pipes and pipes.
Connecting valves or elbows are, for example, in this category.
• A buffer tank should be installed to reduce sudden load fluctuations.(Please refer to the product installation manual guide)
2. While installing water pipes, followings should be considered :
• While inserting or putting water pipes, close the end of the pipe with pipe cap to avoid dust entering.
• When cutting or welding the pipe, always be careful that inner section of the pipe should not be defective.
For example, no weldments or no burrs are found inside the pipe.
• Drain piping should be provided in case of water discharge by the operation of the safety valve.
This situation can be happened when the internal pressure is over 3.0 bar and water inside the unit will be discharged
to drain hose.
3. While connecting water pipes, followings should be considered :
• Pipe fittings (e.g. L-shape elbow, T-shape tee, diameter reducer, etc) should be tightened strongly to be free from water
leakage.
• Connected sections should be leakage-proof treatment by applying teflon tape, rubber bushing, sealant solution, etc.
• Appropriate tools and tooling methods should be applied to prevent mechanical breakage of the connections.
• Operation time of flow control valve(e.g. 3way valve or 2way valve) should be less than 90 seconds.
• Drain hose should be connected with drain piping.
■ Water condensation on the floor
If underfloor cooling is performed, it is very important to keep leaving water temperature higher than 16 ℃.
Otherwise, dew condensation can occur on the floor.If floor is in humid environment, do not set leaving water temperature
below 18 °C.
■ Water condensation on the radiator
While cooling operation, cold water may not flow to the radiator. If cold water enters to the radiator, dew generation on the
surface of the radiator can be occurred. Use 2way-valve to block circuits from cooling operation.
■ Water condensation on the floor
While cooling operation, condensed dew can drop down to the bottom of the unit. The condensing water must be sufficiently
drained from the unit and dissipated frost-free.
9
Installation
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