ITT Laing Thermotech E1 Series Manual

Series E1 and E3 Instant Hot Water Recirculating Systems
Installation, Operation and Service Instructions
INSTALLER: PLEASE LEAVE THIS MANUAL FOR THE OWNER’S USE.
About Recirculation Systems
Air in the System
A properly installed system should include a method of automatically venting the air that enters the water supply line
during use. Air enters the system each time fresh, cold water is introduced into the hot water heater. Air may also enter
the system any time a plumbing line is opened, for instance during a faucet/taps change or adding a sprinkler system.
Water Pressure
A recirculating system is a pressurized system operating at the city water pressure, as determined by the pressure
regulator on your line, or by a well pump, if you are on a well system. In most residential plumbing systems, water
pressure is set at 35 psi (241 kpa) and above. Below 35 psi (241 kpa), water pressure may not be sufficient to fill the
pipe diameter, leaving space for air to accumulate in the lines. If your system pressure is less than 35 psi (241 kpa), use
the next larger pump on the Pump Selection Guide.
Multiple Floors
Because the system is pressurized the number of floors in a home does not need to be taken into consideration in sizing
the circulating pump. The pump only has to produce continuous flow at a pressure sufficient to overcome the friction
losses created by the piping in the house water supply line and the return line.
Oversized Pumps
Pumps should not be so large as to produce flow rates that may eventually erode holes in the pipes. According to the
Copper Development Association, excessive erosion occurs at a velocity of about 5ft. (1.5m) per second and higher; or
about 4 GPM (15 LPM) in 1/2” (5/8”) Type M copper pipe; and 8 GPM (30 LPM) in 3/4” pipe. Use the recommended
recirculation line size shown in the Pump Selection Guide. Bell & Gossett pumps are sized so that flow velocities are well
below these limits.
NOTE: Bell & Gossett recommends Bronze or Stainless Steel Booster Pumps be used for pumping potable
water.
WARNING: Before Installing, using or servicing this product, read the instructions. To reduce risk of electrical
shock see instructions for proper installation.
CAUTION: For supply connections use wire suitable for at least 221ºF (105ºC). Use copper conductors only.
WARNING: California Proposition 65 Warning! This product contains chemicals known to the state of
California to cause cancer and birth defects or other reproductive harm.
WARNING: Risk of electric shock; this pump has not been investigated for use in swimming pool and marine
areas. - Non submersible Pump -
Installation & Instructions for Instant Hot Water Recirculating Systems
Laing Thermotech
Instruction Manual A-00-091-376

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 e3- 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 e3- 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 68ºF to 158ºF (20ºC to 70ºC). 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 10ºF (6ºC) 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.

shut-off
valve
Recirc Pump
shut-off valve
Air Vent
HOT WATER HEATER
hot
supply
line
cold
supply
line
check valve
hose bib
cold
supply
line
BS Models
A. Return into Cold Water Line at Top of Water
Heater fig. 3
B. Return to Drain Valve at Bottom of Water
Heater fig. 4
Figures 1,2,3,and 4 are for single line returns only. For multiple branched supply line installations, a recirculation line
should be installed for each branch.
Note: The Air Vent and Hose Bib are optional with BU models. These models have a built-in air purge valve.
Note: The pump must always be installed below the water level of water heater so that the pump flow is
always upward or directly horizontal and not downward. Do not mount the pump above the water heater.
3. Wiring Instructions
A. Remove the screw at the rear of the motor housing. Remove the wiring compartment cover.
B. Attach the appropriate size electrical connector to the hole in the side of the motor housing.
C. Using a minimum size of 14 AWG copper electrical wire (refer to your local code for wiring restrictions),
wire the motor to a single phase power source that matches the electrical rating on the pump nameplate.
See fig. 5. Use the size of electrical wire as dictated by code.
D. Connect a green ground wire at least the size of the power conductors to the ground terminal.
E. Electrical supply and ground wires must be suitable for at least 221ºF (105ºC).
F. Laing circulators are thermally protected and do not require external overload protection.
G. If a remote device such as a thermostat/aquastat is connected to the pump it must be wired in series with
the power conductor.
4. Purchase materials required
• Laing e3 ReCirc • (1)1/2”(5/8”) or 3/4” swing check valve
• Copper pipe or tubing (not required on BU models)
• Tee for under sink connect • (1)1/2”(5/8”) or 3/4” hose bib/connection
• Tee or “Y” fitting connection to water heater (not required on BU models)
• (2) 1/2” (5/8”) or 3/4” shut-off valves • (1)Auto air vent (not required on BU models)
(not required on BU models) • Misc. nipples and fittings
• Pipe insulation
5. Shut off the water to the house.
6. Drain the plumbing lines by opening the faucet/tap in the house.
Drain the water heater if you plan to make the connection at the bottom of the water heater, which requires removal
of the drain valve.
7. Connect the return line at the last faucet/taps riser and run to the water heater.
Tee the return line as close to the end of the hot water supply line as possible and run the return line back to the water
heater.
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: - Electrical Shock Hazard - Be
certain that all connections are secure and the
conduit box cover is closed before electrical
power is connected. Failure to follow these
instructions could result in serious personal
injury, death and/or property damage.
fig. 5

UltraCirc Models
The BU models incorporate a shut off valve, check valve, and bleed valve into the brass pump housing eliminating the
need to install these components. These models are supplied with 1/2” (5/8”) union fittings. These fittings should be
removed from the pump housing before soldering to avoid damaging the internal valves.
8. Close the shut-off valve on the inlet side of the pump and turn the water supply to the house back on.
9. Flush system of debris.
Before reattaching the pump motor, open the shut-off valve on the inlet side of the pump housing and let water flow
through the housing. Use a bucket to catch the water. Let the water run long enough to clear all sand, solder pellets,
plumbers tape flakes, etc. from the lines. Close the inlet shut-off valve when finished.
10. Connect the pump motor to the housing.
Make sure the rubber o-ring is in place in the housing and the screw ring is securely hand tightened. Reopen the shut-
off valve or valves and let the water flood the pump housing.
Do’s and Do Not’s
Do:
• Install an air vent mounted in a vertical position (if provided).
• Use 1/2”(5/8”) recirculation line tubing.
• Check to be sure there are no crimps or sharp bends in the recirculation line that would restrict the flow.
• Be sure the check valve is installed in the proper direction of the flow.
• Be sure all air is purged from the system prior to starting the pump.
• Use a water conditioner if you have hard water.
• Be sure the gate valves are open before turning on the pump.
• Install the pump pumping in upward direction only.
Do Not
• Use grease or oil to lubricate the pump (it is self-lubricating).
• Over tighten the screw ring.
• Install the pump with the motor above the pump housing.
• Install the pump pumping away from the water heater nor pumping downward.
• Start the pump before the system is full of water and purged of air.
• Allow the water heater temperature above 140ºF (60ºC). (only in the US)
• Install the pump in the supply line to faucet/taps.
• Use any pipe size other than 1/2”(5/8”) for all models.
• Position the pump at the top of the water heater.
Correct Installation
Improper Installation -
Do NOT mount in these orientations
Note: Keep The Hot Water
Temperature Below 140ºF
(60ºC). Higher temperatures
can cause calcium and
magnesium elements to come
out of solution and create
solids which could not only
cause damage to the pump but
also reduce water heater
efficiency and premature
failure of the water heater.
fig. 6
Remove the motor unit and
o-ring from the pump housing into the plumbing
line. Do not sweat the housing into the plumbing
line with the motor or o-ring attached. Arrows on
the pump housing indicate the direction of water
flow.
Caution: Only hand tighten the screw ring.
Do not over tighten! Do not use plumbers
putty on the screw ring.
11. Purge air from the supply line.
Turn on the faucet/taps or shower farthest from the water heater. Open the line until you get a good, steady stream of
water without sputter or evidence of air.
12. Purge air from the return line.
Connect the pump to the electrical supply. With the pump running, open the hose bib/connection and let water run
until the pump is running quietly and there is no sputtering or other evidence of air coming from the hose bib. Close
the hose bib. Your system is now in operation. Allow a few minutes for instant hot water to recirculate to all of your
faucet/taps.
8. Install the pump and other components required in accordance with the diagrams provided in fig. 1 or 2 and
connect the return line to the water heater. Unscrew the pump housing from the motor (fig. 6) and run the pump
for a few seconds to make sure it is operational.

Hard Water Conditions
Use a water conditioner. Hard water can cause scale build-up and eventually reduce the life of the pump and other
system components. Protected by one or more of the following Patents: 4580335, 4615662, 4822256, 4834628, 5094593, 5143049,
5749715, 6149407, 6227235
System Maintenance
• Do not attempt to lubricate the pump. The pump is self-lubricating.
• Prevent the pump from running dry.
• Flush the system of any debris and re-purge all air from the system in the event of any water supply interruptions in
plumbing line.
• Prevent heavy scale build-up by keeping the hot water temperature 140ºF (60ºC) or less. (only in US)
• Don’t over salt your water conditioner.
U.L. Caution
This pump has been tested using water only.
Its suitability for use with liquids other than water is the end user’s responsibility.
Australia
This pump must be installed in accordance with AS3500
Trouble Shooting
Noise in the System
The pump should be virtually noiseless during operation. The rotor may make a brief but hardly perceptible fluttering
noise immediately after the pump is turned off. During normal operation, an occasional air bubble may pass through
the pump housing causing a momentary gurgling noise. However, if noise at the pump persists for any prolonged
period, correct the problem.
• The check valve/non-return valve is mistakenly installed on the inlet side of pump or in the wrong direction.
• The inlet side shut-off valve is closed or clogged.
• There is air trapped in the pump housing (turn the pump on and off several times to see if the air pocket can be
“bumped” out of the pump and if not, then open the hose bib for manual venting).
• There is debris blocking the rotor.
• The rotor bearing has worn due to dry running causing the rotor to wobble during operation.
• If the return line connects to the cold water supply at the top of water heater, the warm water may be creating back
pressure in the cold supply line. If so, add a check valve/non-return valve on the cold supply line above the return line
tee connector.
Pump Operating Intermittently or Not at All
• No power to the pump.
• There is debris or foreign matter in the pump.
• The thermostat is not functioning properly. If wanted, the thermostat may be easily disconnected. Contact the Laing
factory or local representative for details.
Water Taking Too Long to Get to Faucet/Tap
• The hot water supply from the water heater is exhausted.
• The faucet/tap involved may be on a branch line off the main hot water supply line in which case there may be a
slightly longer wait for hot water to arrive than at faucet/tap directly off the main supply line.
• The check valve/non-return valve is installed backwards.
• The pump is not operating.
• The timer is not operating properly.
Signs of Dry Run
Dry run results from inadequate water supply to the pump, which prevents lubrication of the bearing ball. It may be
caused by operating the pump without water in the plumbing lines, which may occur with frozen pipes, or by failing to
turn the pump off when the system is drained for servicing. It can also occur as the result of large air bubbles
collecting in the pump housing and preventing the flow of water over the bearing ball. If the problem is air in the
system, check that the air vent is functioning, that the system is properly purged of air and that the pump and various
system components are installed.
Safety Requirements
Mechanical Safety
WARNING: - Excessive System Pressure Hazard - The maximum working pressure of the pump is listed on
the nameplate - Do Not Exceed This Pressure. Failure to follow these instructions could result in serious
personal injury, death and/or property damage.

ITT
3878 S. Willow, Suite 104
Fresno, CA 93725
Tel: [phone] [phone]
Fax: [phone] [phone]
www.lainginc.com
Copyright © 2009 ITT Corporation,
Printed in Hungary 3-10
THE ITT ENGINEERED BLOCKS
SYMBOL AND ENGINEERED FOR LIFE
ARE REGISTERED TRADEMARKS OF ITT
MANUFACTURING ENTERPRISES, INC.
WARNING: - Electrical Grounding Hazard - Adequate electrical grounding is required for the safe operation
of Laing Pumps. Connect the ground wire to the ground terminal in the wiring compartment. Failure to follow
these instructions could result in serious personal injury, death and/or property damage.
WARNING: - Risk of Electric Shock - Do not install this pump in swimming pool or marine areas. Failure to
follow these instructions could result in serious personal injury, death and/or property damage.
WARNING: - Electrical Shock Hazard - Disconnect and lockout the power before servicing. Failure to follow
these instructions could result in serious personal injury, death and/or property damage.
Removal of Pump From Existing System For Replacement
WARNING: - Hot Water Hazard - Before draining the system, allow water to cool to at least 100ºF (38ºC),
open the drain valve (take precautions against water damage) and leave the drain valve open until servicing
is complete. Failure to follow these instructions could result in serious personal injury, death and/or property
damage.
WARNING: - Electrical Shock Hazard - Be certain the electrical power is not present at the motor leads before
continuing. Failure to follow these instructions could result in serious personal injury, death and/or property
damage.
WARNING: - High Pressure Hazard - Pressure may be present in the pump body. This pressure can be
relieved by loosening the flange bolts and shifting the pump assembly slightly to allow the pressurized water
to escape. Failure to follow these instructions could result in serious personal injury and death.
1. Close the valves on the suction and discharge sides of the pump. (if no valves have been installed, it may be
necessary to drain the system.)
2. Disconnect the electrical supply lines to the pump.
WARNING: - Excessive Pressure Hazard Volumetric Expansion - The heating of water and other fluids causes
volumetric expansion. The associated forces may cause failure of system components and the release of high
temperature fluids. This can be prevented by installing property sized and located compression tanks and
pressure relief valves. Failure to follow these instructions could result in serious personal injury, death and/or
property damage.
WARNING: - Extreme Temperature Hazard - If the pump, motor or piping are operating at extremely high or
low temperature, guarding or insulation is required. Failure to follow these instructions could result in serious
personal injury, death and/or property damage.
Thermal Safety
Electrical Safety
WARNING: - Electrical Shock Hazard - Electrical connections are to be made by a qualified electrician in
accordance with all applicable codes, ordinances and good practices. Failure to follow these instructions could
result in serious personal injury, death and/or property damage.