RainFlo MHP150A, User Manual

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Installation:

Make sure that the voltage supply corresponds to the rated voltage. Remove the cover (faceplate)

from the electronic board and make the electrical connection according to the instructions shown 

inside. This controller can also be used with a single-phase pump with electrical demand greater than 

16A, or a three-phase pump, using an auxiliary remote control switch (115V coil). In this case the 

electrical connections must be made as shown in the diagram, Fig. 3.

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.2 Electrical Connection (Fig. 2)

START PRESSURE

MAX. OPERATING 

HEIGHT

MAX. PUMP PRESSURE 

GREATER THAN

22 PSI

33 ft

44 PSI

29 PSI

49 ft

51 PSI

36 PSI

66 ft

58 PSI

WARNING: The maximum operating height between the pump and the highest point in the 

system will depend on the pump start pressure setting. The maximum pressure of your pump  

must exceed the value of the start pressure setting. Both these limits are specified in the table 

below. 

WARNING: Power supply voltages other than those specified or improper connections can 

permanently damage the electronic components and will void the warranty.

This device must be assembled and installed by personnel qualified in accordance with local 

laws,

regulations and codes.

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.1 Water Connection (Fig.1)

The PC115A must always be installed with the arrows pointing upward, connecting the 

1” threaded inlet to the pump’s outlet and the 1” threaded outlet to the point of use.

Use flexible pipes for connection to the water network, protecting the appliance form any 

bending

loads and vibrations, a ball valve to isolate the pump system from the network, and a 

foot valve to maintain prime for suction inlets (Fig.1).

Before starting up the unit, fill the suction inlet with water as specified in the pump’s 

manual.

H07RN-F3G1.5 type cables (9 - 12 mm) or equivalent must be used in order to 

ensure IP 65 protection.

The connections must be made by a qualified electrician. Install a GFCI for protection

against lethal electric shock. Be sure the circuit and device are properly grounded.

1.  Check that the pump is primed properly, then partially open a tap in the user circuit.

2.  Turn on power to the controller; the power LED will light up (POWER).

3.  The pump will start up automatically and within 20 to 25 seconds the system should 

reach approximately the maximum pressure delivered by the pump. While the

pump is running, the corresponding LED (ON) willremain illuminated.

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Start Up: