Xylem IM 16 User Manual

Installation & Operating Manual

Please read this manual carefully before attempting to install, operate or maintain the product described. Failure to comply with the information provided in this manual could result in personal injury and/or property damage. Retain this manual for future reference.

Laing Thermotech

Instruction Manual

SM(T)-303/353-B SM(T)-909/959-B14(18,21,26) SM(T)-1212/1212B-18(21,26) UC(T)-303/353-B UC(T)-909/959-B-14(18,21,26)

SM-303/353-B

UC-303/353-B

SMT-303/353-B

with 24 hour timer

UCT-303/353-B

SM-909/959-B14

UC-909-BW-14

SMT-909/959-B14

with 24 hour timer

UCT-909-BW-14

with 24 hour timerwith 24 hour timer

Seal-less Centrifugal Canned Motor Pumps For Instant Hot Water Recirculating System

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 is not taken into consideration in sizing the circulating pump. The pump has only 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 5 ft. (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. Laing pumps are sized so that flow velocities are well below these limits.

Pump Selection Guide: The Laing SM and UC 303/353 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 feet (76 M) while the SM-909/959 model pump is designed to handle the circulation requirements of residences and small apartment complexes with pipe loop runs to 700 or 1000 feet (213 - 304 M). The chart below provides a simple rule of thumb to help you match the pump to your system.

Model Volts Cycle Watts Amps SM-303-B 115 60 33 .03 SM-303-B 230 60 33 .15 SM-353-B 230 50 28 .13 SM-909-B-14 115 60 65 .58 SM-909-B-14 230 60 65 .29 SM-959-B-14 230 50 55 .25 SM-909-B-18(21, 26) 115 60 98 .95 SM-909-B-18(21, 26) 230 60 98 .47 SM-959-B-18(21, 26) 230 50 82 .40 SM-1212-B-26 115 60 140 1.22 SM-1212-B26 230 60 140 .61 SM-1252-B-26 230 50 115 .61

UC Prefix denotes UltraCirc Housing The 3rd digit T denotes with timer Maximum Pressure 150 psi (10 BAR) Maximum Temperature 230ºF (110ºC)

Housing Codes Material/Connection Available On BS 1/2 Brass 1/2” (5/8”) Sweat All BT 1/2 Brass 1/2” (5/8”) Threaded Female NPT 303 BS 3/4 Brass 3/4” Sweat 909/1212 ST 3/4 Stainless 3/4” Threaded Female NPT 909/1212 BF Bronze 3/4” Flanged 909/1212 HF Cast Iron 3/4” Flanged 909/1212

Note: Sizes in parentheses are Australian pipe sizes

This pump must be installed in accordance with AS3500.

This pump has been tested using water only. Its suitability for use with liquids other than

water is the end user’s responsibility.

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).

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.

Australia

U.L. Caution

UC/UCT 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

SM/SMT 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

Note: The Air Vent and Hose Bib are not required with UC/UCT-01 models.

These models have a built-in air purge valve.

Above diagrams are for single line returns only. For multiple branched supply line installations, a recirculation line should be installed for each branch.

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. Purchase materials required.

• Laing ReCirc® (SM-303/353/UC-303/353 or SM-909/959) • (1)1/2”(5/8”) or 3/4” swing check valve

• Copper pipe or tubing (not required on UC/UCT models)

• Tee for under sink connect • (1) 1/2”(5/8”) or 3/4” hose bib/

• Tee or “Y” fitting connection to water heater connection (not required on UC/UCT-01

• (2) 1/2” (5/8”) or 3/4” shut-off valves models)

• Misc. nipples and fittings UC/UCT models) • (1) Auto air vent

• Pipe insulation (not required on UC/UCT-01 models)

4. Shut off the water to the house.

5. 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.

6. 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.

7. 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 (also see fig. 3).

For SM(T) and UC(T) 303/353 Models Check pump operation before you begin. Unscrew the pump housing from the motor (fig. 4) and run the pump for a few seconds to make sure it is operational. Remove the rotor (see fig. 5) and add a little water to the bearing ball for lubrication. Do not use grease or oil to lubricate the pump.

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