Water Pipe Installation; Schematic Piping Diagram And Piping System Components - Mitsubishi Electric CAHV-R450YA-HPB Installation & Operation Manual

3. Water Pipe Installation

[1] Schematic Piping Diagram and Piping System Components

Indicates the direction of
the flow.
Unit
Water
side heat
exchanger
c
1 Union joints/flange joints
2 Thermometer
3 Water pressure gauge
4 Valve
5 Flexible joint
Pump
6
7 Automatic air vent valve
Closed expansion tank
8
Water pipe
9
0 Drain valve
a Strainer
b Flow switch
Drain pipe
c
d Check valve
e Safety 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 automatic air vent valves where air accumulates.
Even in the case of a failure of the water-side heat exchanger in the unit, the refrigerant
may leak from the automatic air vent valve.
To prevent accidents resulted from refrigerant leakage, install the unit where leaked
refrigerant will not accumulate, such as outdoors.
Install a closed 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.
Install a safety valve near the closed expansion tank.
Even in the case of a failure of the water-side heat exchanger in the unit, the refrigerant
may leak from the safety valve.
To prevent accidents resulted from refrigerant leakage, install the unit where leaked
refrigerant will not accumulate, such as outdoors.
12
Air conditioning
floor heating
etc