Power-Flo Pumps & Systems • 877-24PUMPS • www.powerflopumps.com
4
Installation
Pre-Installation
The following checks should be made before
beginning installation.
A.) Uses:
These pumps are generally
designed to circulate water from 32°F to
230°F and up to a maximum pressure of
145 psi. They are designed to be installed
in residential potable domestic hot water
systems to provide recirculation
(with a
dedicated recirculation pipe loop installed in
the system)
of domestic hot water resulting in
“instant” hot water at fixtures throughout the
house.
Open Systems:
These series pumps with
s
tainless steel or bronze pump housings are
designed to pump water compatible with
thier construction and can be used in both
open and closed systems.
B.) Maximum Water Temperature:
The
maximum allowable water temperature is
determined by the ambient or surrounding
air temperature. (See Figure 1)
C.) Inlet Pressure Requirements
The amount of pressure required at the inlet
of the pump is a function of the temperature
of the water as shown in the chart.
Inlet Pressure Requirements
Water (°F)
190 165 140
Required Inlet Pressure (ft)
5
4.5
3
(psi) 2.2
1.9
1.3
In a pressurized system, the required inlet
pressure is the minimum allowable system
pressure. In a system open to the atmosphere,
the required inlet pressure is the minimum
distance the pump must be located below
the lowest possible water level of the water
source.
Installation
Position of terminal box:
Proper installation
of the pump will have the terminal box
located to one side of the pump or the
other, with the conduit entry up. This is so
condensation does not run down the cord.
If the terminal box posistion needs to be
changed, it is best to do so before installation.
However, if the pump is already installed,
ensure that the electrical supply is turned
off and close any isolation valves before
removing the allen screws.
To change the terminal box posistion:
1. Remove the four (4) Allen screws while
supporting the stator.
2. Carefully separate the stator from the
pump chamber and rotate it to the correct
terminal box orientation.
3. Replace the Allen screws and tighten
diagonally and evenly to 7 ft-lbs.
4. Check that the impeller turns freely, if
not repeat the disassembly and reassembly
process.
t1 °F
35.6
104
140
176
194
212
221
230
t2 °F
32
104
140
176
158
140
131
93
Figure 1
t1 max: + 230°F
t2 min: + 35.6°F
PFWRC66B1S
Wet Rotor Circulator Pumps
