Hose Bib
Recirc
Pump
Hot
Water
Heater
Air
Vent
Return Line
Hose Bib
Recirc
Pump
Air Vent
Hot
Water
Heater
BU Models
A. Return into Cold Water Line at Top of Water
Heater fig. 1
B. Return to Drain Valve at Bottom of Water
Heater fig. 2
Pump Selection Guide
The Laing e
3
- 4 Series models are designed to handle the recirculation requirements of residences with a pipe loop
(the total length of hot water supply line plus the recirculation line) up to 250 ft (76 M). The e
3
- 6 Series model pump is
designed to handle the circulation requirements of residences and small apartment complexes with pipe loop runs to
700 or 1000 ft. (213-304 M). The figures below provide a simple rule of thumb to help you match the pump to your
system.
Installation and Start Up
1. Select the sink under which to connect the recirculation line (the sink where the hot water takes longest to
arrive which is usually the sink farthest from the water heater).
Adjustable Thermostat Option
For models with the adjustable thermostat, there is an adjustable
Set Point range from 68
º
F to 158
º
F (20
º
C to 70
º
C). This built-in
temperature sensor will turn the circulator off when it reaches the
set point and turn the circulator on when the temperature is more
than 10
º
F (6
º
C) below the Set Point. The adjustable thermostat is
only available on fixed-speed motors.
2. Plan your installation.
Decide on the course of the recirculation pipe (also determining the length of the pipe required) and whether the
return line should be connected to the water heater cold water inlet line (tee fitting required) or to the bottom water
heater drain valve (“Y” type fitting required to fit to existing drain valve outlet). See figure 1 and 2 for the installation
schematic.
CAUTION:
The use of Teflon
®
impregnated pipe compound and Teflon
®
tape on pipe threads provides lubricity
which can lead to overtightening and breakage. Do not overtighten. Failure to follow this instruction can result
in moderate personal injury from hot water and/or property damage.
CAUTION:
Make sure the power is turned off before placing anything inside the discharge opening to move
the impeller. Failure to follow these instructions could result in serious personal injury, death and/or property
damage.
WARNING: - Electrical Shock Hazard -
Disconnect and lock out the power before making electrical
connections. Failure to follow these instructions could result in serious personal injury or death.
WARNING: - Hot Water Leakage Hazard -
Pressurize the body slowly while checking for leaks at all joints with
gaskets or solder connections. Failure to follow these instructions could result in serious personal injury and/or
property damage.
