Series e3-4/e3-6 Instant Hot Water Recirculating Systems

Series e3-4/e3-6 Instant Hot Water Recirculating Systems
Series e3-4/e3-6 Instant Hot Water Recirculating Systems
Fig. 5
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
Caution: Only hand tighten the screw ring. Do not over
tighten! Do not use plumbers putty on the screw ring.
Fig. 6
e3-4 and e3-6 Models - Rotor/Impeller Installation: To remove the rotor unit,
grasp the top of the unit and gently pull straight up. Do not pull up on one side
only or push the rotor sideways. If the rotor sits too tightly, carefully lever it off
with a screwdriver on each side of the rotor. When re-installing the rotor, use
enough force to hear the rotor “click” on to the ceramic bearing and spin the
rotor with your fingers to insure that it turns freely.
Remove the Rotor/Impeller by
using forefinger and thumb and
pulling upward.
Or, if the Rotor/Impeller cannot
be removed using forefinger and
thumb, carefully lever off evenly
with two screwdrivers.
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.
11. Purge air from the supply line.
Correct Installation
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.
Improper Installation Do’s and Do Not’s
Do NOT mount in these orientations
• 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.
Note: Keep The Hot Water
• Be sure the gate valves are open before turning on the pump.
Temperature Below 140ºF
• Install the pump pumping in upward direction only.
(60ºC). Higher temperatures
Do Not
can cause calcium and
• Use grease or oil to lubricate the pump (it is self-lubricating).
magnesium elements to come
• Over tighten the screw ring.
out of solution and create
• Install the pump with the motor above the pump housing.
solids which could not only
• Install the pump pumping away from the water heater nor pumping downward.
cause damage to the pump but
• Start the pump before the system is full of water and purged of air.
also reduce water heater
• Allow the water heater temperature above 140ºF (60ºC). (only in the US)
efficiency and premature
• Install the pump in the supply line to faucet/taps.
failure of the water heater.
• Use any pipe size other than 1/2”(5/8”) for all models.
• Position the pump at the top of the water heater.
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
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.
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 B&G
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.
Xylem Inc.
8200 N. Austin Avenue
Morton Grove, Illinois 60053
Phone: (847) 966-3700
Fax: (847) 965-8379
Bell & Gossett is a trademark of Xylem Inc. or one of its subsidiaries.
© 2012 Xylem, Inc. A-00-091-365A July 2012
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF