4
Power-Flo Pumps & Systems • 877-24PUMPS • www.powerflopumps.com
PFWRC67S1U
Wet Rotor Circulator Pumps
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.
Open Systems:
These series pumps with
s
tainless steel or bronze pump housings are
designed to pump water compatible with
their 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 with the
conduit entry up (See Figure 2). This is so
condensation does not run down the cord.
Pump Mounting
The pump mounts on top of the water heater
on hot water supply side and will connect
directly onto the supply nipple on top of the
heater. Arrows on the pump chamber indicate
direction of flow through the pump. The
pump must be mounted vertically, free of
stresses from piping system with the pump
shaft in the horizontal position.
NEVER install the pump with the shaft
vertical or where the shaft falls below the
horizontal plane.
IMPORTANT! - This pumps MUST be installed
with Power-Flo Pumps “Retro-Fit Valve”
model PFRFV. See Retro-fit Valve’s manual
for installation.
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
