Water heater contactors

Waterheatertimer.org
is a self-help site

Oct 2010

Water heater contactors

Each water heater requires separate contactor

Fasco H230B contactor
2-Pole 40A resistive
120V coil
H230B at CSH
Fasco info sheet
Model has cover over points

Seimens Energy Co
Furnas definite purpose controller 45EG20AF

2-Pole 40A resistive
110V coil
At Pex Supply
At Parts Guy

What is a contactor?

Each time a compressor <> well pump <> refrigerator <> washing machine <> clothes dryer <> Heat/AC <> computer turns on, a contactor handles the job. Contactors (also called controllers or relays) are designed for electric switching jobs. Every home has contactors working each day. read wiki

For a water heater timer, a specific contactor is shown.

Choose: Siemens 45EG20AF Definite Purpose -or- Fasco H230B -or Cutler Hammer C25BNB230A > these are interchangeable 2-pole 30A contactors rated 40A resistive with a 110 volt coil. Other models include: Fasco H240B and Cutler Hammer C25BNB240A and economy-priced Honeywell DP2030B1002. Also solid state contactors are available at much higher cost.

Square D 8910DP12V02
Square D at Grainger

Cutler Hammer 30 amp C25BNB230A
Eaton
Model Number pdf
At Allied

Honeywell DP2030B1002:
At Climate Control
At Industrial Controls

Wires connected to 45EG20AF using female terminals

When turned on, coil burden or coil VA is 7.3 Watts <> when activated, inrush is 27 Watts.

Life expectancy <> 0.5 - 2.0 million operations
Life expectancy of Seimens definite purpose controllers

http://www.fixya.com/support/t7225065-am_installing_timer_whole_house_fan

45EG20AF contactor bolted into 6x6x4 enclosure using #8-32 x 3/4" bolts

Contactor at angle leaves room for wire

How to wire contactor for water heater

Larger image
Larger image	PB series and other Intermatic timer modules

Contactor maintenance
	Life expectancy <> 0.5 - 2.0 million operations Contact points stick sometimes Solution: use nail file or emery board or folded sandpaper to clean off points. Handy trick Add indicator light so you can see when water heater is on. If points stick, indicator light remains on. Electrical formulas	<> buy Grainger item 1XWK8 <> buy Grainger item 1CV90 Indicator requires another fuseholder. Instructions for connecting indicator here and on page 3 near bottom

Troubleshoot Household electricity

How to twist wire
How to wire Cooper 277
How to wire combo switch-outlet
How to replace 3-speed fan switch

How to wire 3-way switches
How to wire 4-way switches
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers

How to wire photo eyes
How to wire photo eyes

Troubleshoot Malibu outdoor lights
Terminals
Select and install wire nuts
Select wire size

Replace breaker
Install subpanel

Electrical formulas
Electricians forum

How to wire GFCI
How to wire GFCI combo

Basic water heater circuit
How to wire water heater for 120Volt
Install old work box

How to drop wire from attic
Romex connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets

See inside main breaker box
Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
How to install electric meter on water heater
How to wire water heater thermostat
How to wire water heater with switches and timers

6x6x4 Enclosures

Do it yourself water heater	Electricity from pole to breaker box	Compare all water heater timers	Terminals
How to wire Dayton OFF-delay timer	How to wire off-peak water heater	240 V Intermatic water heater timer	Compare box timers

E-mail: info@waterheatertimer.org
Site map