3-2
3.2
Names and functions of each part
3.2.1
Names and functions of the components of the water supply unit
䐟
Control panel
The control panel controls the pump and supplies the power to the motor.
It enables to start/stop the pump, detects the operating status of the pump and automatically switch the No.
of the pump to run.
Also it enables pump variable speed control by a pressure transmitter signal and thereby estimated
terminal pressure constant control is conducted.
䐠
Pump
Its motor rotates an impeller to generate pressure for delivering water.
䐡
Pressure transmitter
The pressure transmitter converts pressure into an electric signal so as to use it for control.
䐢
Pressure tank
The pressure tank maintains the pressure in the piping and reduces the number of start/stop and pressure
fluctuations of the pump.
䐣
Junction pipe
The junction pipe joins the discharge pipes of the two pumps into one pipe.
䐤
Discharge elbow
The discharge elbow has a built-in cushion check valve and is equipped with the flow switch
㻌 䐦
. Inside the
elbow, a bypass is provided so as to make the water reverse-flow during maintenance by opening.
䐥
Gate valve
The gate valve is used for maintenance and is provided for each pump.
䐦
Flow switch
The flow switch outputs a signal to stop the pump when the water flow rate is not higher than the setup
(stop) flow rate.
䐧
High temperature sensor
If the water temperature is not lower than the setup temperature due to zero-discharge operation, the high
temperature sensor outputs a signal to stop the pump.
䐨
Priming plug
This plug is used to prime the pump.
䐩
TJ valve
This is a three-way valve used to discharge water from the pressure tank when you carry out the
maintenance of the pressure tank and the pressure transmitter.
䐪
Air vent plug of pump
This plug is used to release air from the pump.
䐫
Pump drain
This drain is used to discharge water from the pump.
1
2
3
4
5
6
7
9
10
8
11
13
12
Fig.3-2-1 NX-VFC-e Multiple pump control water supply unit
(This figure shows for 3 pumps unit)
