RainFlo MHP150A, User Manual

Thank you for your purchase of a RainFlo Pump Control.

Your commitment to saving water through the use of harvested rainwater is 

commendable, and is a very important step towards increasing your personal water 

sustainability.

To match your commitment to saving water we have committed to ensuring that 

the pump controllers we offer are of the highest quality available. This pump 

controller has been tested and certified ROHS compliant for your safet

y

. 

The RainFlo PC115A provides automatic multifunction control for your water 

pump including start and stop control based on user demand (flow), demand-side 

pressure display via built-in pressure

gauge, run-dry protection and a check valve 

(non-return valve) function. It provides direct control of water pumps up to 1.25 

horsepower at 115V. As with most pump controllers, the system high pressure is 

based on the pump output. The pump start pressure (low pressure threshold and 

start trigger), is adjustable through a screw on the back side of the unit. 

Your PC115A pump controller features a built-in pressure gauge located on the 

right side of the unit. As with many hydraulic devices, this gauge displays 

pressure in units called “bar”. One bar is approximately equal to atmospheric 

pressure at sea level. In terms of water pressure, 

1 bar = 14.5037 PSI.

Pressure Gauge (bar)

Pressure (PSIG)

2.0

29.0 PSI

3.0

43.5 PSI

4.0

58.0 PSI

5.0

72.5 PSI

6.0

87.0 PSI

7.0

101.5 PSI

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1

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Overview

 of Pump Controller

:

1

3

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Pressure Gauge:

1

2

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Important Notice:

Read carefully before proceeding with product assembly and commissioning 

operations. For the pump, refer to its manual. 

The PC115A features an internal check valve which requires the unit to be installed 

with the water inlet facing downward and the output above (arrows near the pressure 

gauge facing up).