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Recirculation system
Taco recirculation systems  
Taco

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Taco recirculation systems

Resource:
General Taco manual
General manual
Figure flow rates
Basic pump science/ pdf
How to choose circulator pump
Grundfos recirculation systems
Grundfos UP series

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Grundfos recirculation systems
Replacement crossover valve
Clip-on thermostat control
UP circulator timer

Resource:
General product manual
UP Specification sheet
Troubleshoot grundfos pump
watts recirculation systems
Watts

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Watts recirculation systems
Replacement crossover valve
Watts sensor valve kit

Resource:
Watts recirculation manual
Install/ maintenance tips
grundfos super brute
Grundfos UP series
Grundfos circulation pump for baseboard heating or water heater recirculation
Requires flange set
Use for whole house... install on 3/4" pipe or 1"

Buy:
Grundfos UP series super brute at Amazon
UP15 circulator timer
grundfos bushings
Buy:
Grundfos flange set
Taco flange set

Load calculation for pump:
1 horsepower = 756 watts.
1/25 Hp motor = 30.6 watts  
30.6 watts divided by 120 volts = .255 amp
Laing recirculation systems
Laing

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Laing recirculation systems

Resource:
Autocurc manual
ACT 909 manual
E10 autocirc manual
Laing thermotech
Troubleshoot laing pump
 
Grundfos 24-hour analog timers for UP and UP15 models
Analog pin-type with 15 minute on-off intervals. Repeats same each day. Reset after power outage
Choose timer: Saves money, schedules 'instant' hot at faucet. Move slide switch to timer and system runs specific times of day. Timer helps prevent short-cycle, or continual on-off throughout day.

Choose Thermostat operation: Hot water available at all times. Move slide switch to ON.
Pump runs whenever temperature inside pipe drops below 85-90F and run until temperature reaches 95-100. Some pumps have variable thermostats and some have higher setting.
Buy:
UP circulator timer
UP15 circulator timer

Taco 7-day programmable and 24-hour analog
7-day programmable timer with 1 minute intervals. Each day of week can be different.
Analog pin-type with 15 minute on-off intervals. Repeats same each day.
Buy:
Taco timer at Amazon
Resource:
DIGI 240V manual
Crossover valve
Larger image
Crossover valve
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Replacement crossover valve for UP
Watts sensor valve kit
Resource:
Troubleshoot valve page 3-4
Example illustrations
Applies to Taco, Grundfos and Watts. Does not apply to Laing
Install under sink. When pump is ON, crossover valve opens and lets hot water circulate back to water heater through cold water line so immediate hot water is available at faucet. When you turn on cold water at the faucet, the crossover valve closes, allowing cold water to enter the faucet. However you wait longer for full cold water.
When temperature at crossove valve reaches 95F, the valve shuts off hot water entering cold water line.
Air Vent
Purpose of air vent to vent air in line caused by pump. Circulation pumps often create bubbles in the water line. Air bubbles cause noise and cause pump to stop functioning ... the impeller turns but no water moves.
Installing air vent at highest point in recirculation loop will vent air bubbles... pump last longer.
Buy:
Air vent/ Float vent
grundfos thermostat
Use with UP series pump and timer
grundfos thermostat
Grundfos UP sereis
Clip on thermostat control
120 volt thermostat-switch clips onto water line
Lets you control pump or any 120 volt circuit based on temperature of water pipe.
Continuous operation: The electric cost varies .... pump is usually 1/16 Hp, or 47 watts = 138 Kwh per year = $14-18 for 1 year operation.
The pump does not harm anything if left ON ... except shorten lifespan of product so you would need to calculate replacement cost... or use clip on thermostat, ... you would splice the thermostat into the recirculation pump cord on the black Hot wire that goes to pump.
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Aquastats at Amazon
1/2" 595443ON at 85/ OFF at 105
3/4" 595444 ON at 85/ OFF at 105
1/2" 595656 ON at 105/ OFF at 115
3/4" 595657 ON at 105/ OFF at 115

Local YMCA hot tub = temperature 105/ Typical shower-bath = 110F
24 hour programmable timer for UP series pumps
Grundfos recirculation systems at Amazon
UP series pump at Amazon

Resource:
Clip on thermostat manual
UP series specification sheet
System illustrations
Hot water recirculation system
Full image
Laing Pump OFF
Typical installation at faucet.
System with timer turned off. Cold water available immediately, but wait for hot water.
Water- savings estimate: put empty gallon can under tub spout and see how much water is wasted waiting for hot water. Use water for plants.

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Laing recirculation systems
Re-circulation system
Full image
Laing Pump ON

Hot water available, but wait for cold water.

Timer saves energy compared with recirculation system that runs full time.
Autocirc uses timer, but also turns off when temperature reaches 95, and turns on when water temperature drops to 85.
Reset timer after power outage.

Buy:
Laing recirculation systems
Grundfor recirculation system installation Grundfos UP series is installed in upright position on hot pipe
Which pipe is Hot? 1) Usually the cold line has shut off valve. 2) Top of tank also has H and C markings. 3) Turn on Hot faucet for few moments and use hand to check which pipe feels hot.
Pump installed sideways will not work,
Resource:
Typical plumbing diagrams
Installation manual with photog
recirculating system Recirculating system
Pump installed at tank

Buy:
Grundfos
Watts
 
See larger
Direct return/ probably saves money
Does not use cold water line
Requires dedicated return line connecting to water heater drain port
Saves money since water is not wasted waiting for cold to arrive

Direct return connects to water heater drain port.

Resource:
How to remove drain valve
Different type of water heater valves
How to flush water heater
Tankless recirculation
Larger image
Best design
Tankless recirculation with direct return line

Water must circulate through small water heater to ensure enough hot water in recirculation loop. Reason: small pump might not activate tankless burner or element.

Add check valves as shown.

System can have faucets that are not connected to recirculation loop as shown with faucet on right side.

Resource:
More Tankless recirculation illustrations
Compare small water heaters
Keep Water Heater Temperature Below 140F (60C): Can cause early water heater failure and pump failure
High temperatures cause calcium and magnesium to come out of solution and create solids. These solids can damage pump and reduce water heater efficiency.
Resource:
How to adjust temp of water heater
How to maintain water heater
Temperature needed to kill bacterial 140F
Control pump remotely
WeMo Control pump with cell phone using WeMo
Plugs into 120volt outlet
Programming resources are online/ No subscription 
 
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WeMo at Amazon
Belkin WeMo at Amazon

Unlocked smartphone
Unlocked smartphone
Skylink remote control countdown timer
Skylink wireless countdown
Skylink wireless countdown
Skylink estimate 1/3 Hp
Grundfos pump is 1/25 Hp
120V 60 Hz/ 10 watt miminum/ 1500 watt
Operate as ON-OFF or Countdown device/ Up to 500 feet
15 minute - 60 minute countdown
Buy:
Wireless wall mount transmitter TB-318 at Amazon
Wireless countdown receiver PA-318 at Amazon
Transmitter and receiver
Resource:
PA-318 manual
How to install recirculation system
Off delay timer for recirculation system
Off delay timer for recirculation system
Push either button to activate delay timer sequence
Another wiring example using push button -or- ST01 programmable timer to start delay
Operate recirculation system remotely from 1-2-3+ different locations
How it works: Do NOT connect voltage to bell wire going to push buttons. Lighted doorbell button does not work... must be unlighted. The push buttons receive no voltage or power... do not connect to power source.
Connect 120volt Hot and Neutral wires to delay timer base as illustrated.
Plug timer into base. Choose delay time from .05 seconds to 999 seconds
Push doorbell button. Activates timer.
Timer turns ON and begins countdown.
Pump turns ON and turns OFF when countdown stops.
Delay timer rated 1/3 Hp.... recirculation pump rated 1/25 Hp

Buy:
Example 50' thermostat bell wire at Amazon
6A855 Solid State timer at Amazon
11-pin plug-in base at Amazon
Push button plate Amazon
Resource:
Other countdown timers
More off delay and pin timer illustrations
6A855 Manual
AH3-3 wiring Remote control countdown timer
Operate recirculation system remotely from different location
AH3 off-delay timer
Flip switch and load turns on until delay period expires
Buy:
120 volt AH3-3 at Amazon

Resource:
How to wire AH3-3 timer
More countdown timers
remote control countdown timer
Larger image
Remote control countdown timer
Buy:
120 volt AH3-3 with base at Amazon
6A855 Solid State delay timer at Amazon
11-pin plug-in base at Amazon
Woods 32555 at Amazon
GE remote at Amazon
Wireless remote controls at Amazon
Replacement A23 battery at Amazon

Select recirculation pump
Resource:
How to wire AH3-3 timer
See analog plug-in timers
See remote controls
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Professional services
 
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How to install electric water heater
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Troubleshoot electric water heater
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Icon gas valve

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Recirculation system

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Point of use water heater
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