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How to wire GE 15132 timer

GE 15136 timer
Buy 24 hour:
GE 15135 24-hour/ 40 amp/ outdoor metal box

56922 plastic box at Amazon

15207 Manual
Quick-start guide to wiring

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GE 15136 timer
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GE 15136/ 7 day/ 7 programs /40 amp/ outdoor metal box

GE 15132 manual
How to wire GE 15136
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Tork DTU water heater timer
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Permanent ON-OFF override

Buy 24 hour/ or 7-day
DTU40 At Amazon

DTU40 instruction manual
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GM40 timer
GM40 series
7-day and 24 hour
GM 40 series timers with same wiring

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water heater timer
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See large image                                                            See Close-up
Timer safe for 1 residential water heater.

Step 1:
Remove screws on face to access wiring.
Set dip switch before connecting power.

Manual says that incorrect dip-switch setting will damage timer.
dip switch Step 2: Dip switches

GE 15132 timer can be used for 120V or 240V water heaters > simply change dip switches to select different voltage.

Water heater voltage is printed on side of water heater. Match dip switches and water heater voltage.

Figure Volts Amps Watts for your water heater

Review basic 240V water heater circuit
Turn off power. Test wires with non-contact tester to make sure power is off.
Never stand on bare ground, always stand on dry boards with working with live electricity.
Do not touch water heater that is wet unless power is OFF.
Set dip switches correctly before applying voltage, otherwise you cannot harm the timer.
Make sure screws are very tight against copper wire.
Use only copper wire.
Do not mix two different gauge wires under same screw terminal.
Do not use solid wire and stranded wire under same screw terminal.
Make sure only copper wire, and no insulation is under screw terminal.
GE 15000 series timers are versatile and can be wired many different ways.

Other residential timers wire exactly same way.

Never assume power is OFF

Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.

Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon

Shop Amazon - Industrial and scientific
Shop Amazon - Industrial Electric Products

Use Wire connector
1/2" & 3/4" knockouts

Terminals: TIMER  NO  NC  COM  NO2  NC2  COM2
Step 4: Wiring features

Four basic features inside 15132

1. Dip switches
2. Screw terminals for clock
3. Screw terminals to contactors
4. Contactors/relays that handle on-off switching to water heater

Larger image
More ways to wire for 240Volt
Step 5a: 

Wiring diagram for 240V water heater. Both white and black wires are hot.
Power connects to clock, and to COM terminals

Use 10 gauge wire for 240V water heater

GE 15132 timer is housed in plastic box
Ground wire is not connected to box
Ground wire travels continuously from breaker box to water heater.
When using black-and-white wires for 240Volt, add tape to white wire.
This action will tell next electrician that white wire carries power

Larger image
More ways to wire for 240Volt
Different way to do same wiring shown in first image above using NO and COM terminals in reverse.

Why show this variation when manual does not?
SPDT timer with dip switches, and dry NO NC contacts can be wired many different ways.
There is no ez way to show all options.
More ways to wire for 240Volt
Timer is open to experimentation by user.

Set dip switches BEFORE applying voltage to terminals.
Do not spark-test wires across terminals.
Wire GE timer for 120-240 volts Timer toggles water heater between 120Volt and 240Volt

Use SPDT timer to change water heater between 120Volt and 240Volt

Use 120Volt at peak-electric price.
Water heater recovers slowly with 120Volt, and uses 1/4 power.

Use 240Volt when electric prices are lower, and faster recovery is needed.

How to change water heater to 120Volts

Off-peak water heater options

9 ways to save with water heater

Install electric meter on water heater
Compare 16 ways to control water heaterTimer toggle between applainces
Larger image
Dishwashers at Amazon


Use Timer to toggle between appliances

240Volt circuit can be cut off by turning off one hot wire.
Put water heater on NC normally open terminal, so water heater is ON all the time, except when timer turns ON, and then circuit to dryer is activated.

Same wiring applies to many timers including Intermatic GM40 & WHQ, Tork DTU40
Other timers can perform same operation such as Intermatic T1905 & T1975

How to wire 240Volt outlets

GE 15207 timer controls 2-speed pool pump
Always check pump voltage and wiring diagram located on nameplate


GE 15000 series timers control 2-speed pump

Low speed is connected to NC terminal, and then pump operates continuously in low speed until timer turns ON.
When timer turns ON, High speed turns ON.
Diagram applies for both 120V and 240V 2-speed pool pumps.
Other timers can be used for 2-speed pool pump:
Tork DTU40, GM40 timer, T106 timer, T1906 timer
Pump operates continuously. Install another timer on L2 Hot line to turn pump ON-OFF

Change water heater temperature using timer
Larger image
Element rated for 4500 watts @ 240Volt, will consume 25% or 1125 watts @ 120Volt
Change water heater temperature using GE 15132 timer
Same wiring applies to GE 15087- 15132 etc series timers
Applies to Tork DTU timer and Intermatic GM40 timer
and Intermatic WHQ series and Intermatic T106 timer


Use timer for two different temperatures on electric water heater.

Either upper thermostat and element have power or lower themostat and element have power. But not both at same time.

Install ECO-protected thermostat for lower thermostat.
Both upper and lower parts of tank are ECO-protected from overheating
Rewire tank so upper and lower parts are separate.
Use GM40 timer to switch power between lower and upper parts of tank.

Normal operation, the lower thermost and element receive power and keep tank at temperature set point. Upper thermostat and element have no power.
This is called 'redundant' water heater operation. This technique for heating tank more rapidly after cold water first enters tank.

When timer activates, power to lower part of tank turns OFF. Power to upper part of tank begins. Upper thermostat is set for higher temperature.
Since tank is at regular temperature, the higher setting means upper element will turn ON and begin heating tank to higher set point.

Use this technique to heat water very hot for laundry cycle.
Disadvantage: The lower part of tank will cool rapidly as new cold water enters tank, so this technique is good for making short-term batches of hot water.
Step 5b: 

Wiring diagram for 120V water heater. The black wire is hot, the white wire is neutral.

GE 15132 timer is housed in plastic box
Ground wire is not connected to box
Ground wire travels continuously from breaker box to water heater.
Wire GE15207 for under counter water heater Timer wired to control 120Volt under-counter water heater
Avoids having to run additional wire to power 1500 watt under-counter water heater.
Circuit uses same wire that powers dishwasher.
Either dishwasher or water heater can be used, but not both at same time.
Set dip switches for 120Volt
How to install under-counter water heater
See Larger image of instructions

GE 15132 instructions
See Larger
Step 6: How to set timer

See 15132 manual

GE 15132

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