4. System Design
4-1. Water Pipe Installation
4. System Design
4-1-1. Schematic Piping Diagram and Piping System Components
Please build the water circuit so that it is a closed system.
Do not use water directly for showers or other applications.
Do not allow other heat source water to mix with the water circuit.
Build a water circuit as inlet water temperature fluctuation is within 5ºC/10 minutes.
Indicates the direction of
Union joints/flange joints
Water pressure gauge
Air vent valve
Required to allow for a replacement of equipment.
Required to check the performance and monitor the operation of the units.
Recommended for checking the operation status.
Required to allow for a replacement or cleaning of the flow adjuster.
Recommended to prevent the noise and vibration from the pump from being transmitted.
Use a pump that is large enough to compensate for the total water pressure loss and supply sufficient
water to the unit.
Install air venting valves to the places where air can accumulate.
Automatic air vent valves (such as
Install an expansion tank to accommodate expanded water and to supply water.
Use pipes that allow for easy air purging, and provide adequate insulation.
Install drain valves so that water can be drained for servicing.
Install a strainer near the unit to keep foreign materials from entering the water-side head exchanger.
Required to protect the unit.
Install the drain pipe with a downward inclination of between 1/100 and 1/200.
To prevent drain water from freezing in winter, install the drain pipe as steep an angle as practically
possible and minimize the straight line.
For cold climate installation, take an appropriate measure (e.g., drain heater) to prevent the drain
water from freezing.
Required to prevent the backward flow.
To drain outlet
gradient of 1/200
) are effective.