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How to wire GE 15087

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How to wire GE 15207 indoor water heater timer

Quick start guide

Compare 16 electric and 2 gas  water heater timers
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GE 15207 water heater timer
See Close-up
GE 15207 Timer
See large image
Timer safe for 1 residential water heater.
Buy:
15087 at Amazon
GE 15207 at Amazon
56922 at Amazon
15135 24-hour/ metal outdoor box/ Amazon
Resources:
GE-15087-15207-56922-Manual
Quick-start guide to wiring

Max 24 on-off periods per day

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

Manual says that incorrect dip-switch setting will damage timer.
dip switch

Dip switches

Step 2: Dip switches

GE 15207 indoor 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

Cautions:
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.
GM40
DTU40


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.


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

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

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

Terminals: TIMER  NO  NC  COM  NO2  NC2  COM2

Features

Step 4: Wiring features

Four basic features inside 15207

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

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Larger image

More ways to wire for 240Volt

240 Volt

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 15207 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

240 Volt

Different way to do same wiring shown in 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
Element rated for 4500 watts @ 240Volt, will consume 25% or 1125 watts @ 120Volt

240-120 Volt

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

Timer toggle between applainces
Larger image
Buy:
Dishwashers at Amazon

120-240Volts

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

240 volt 3 speed motor

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
GE 15207 3-phase
Larger image

120-208-240 volt 3-phase

Example: High leg delta
Tork DTU 3-phase timer 120 or 208 or 240Volt
See more 3-phase
High leg delta
Change water heater temperature using timer
Larger image
Change water heater temperature using GE 15207 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

240 Volt

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.
FM1D 24V timers AC and DC How to wire thermostats
How electric water heaters work
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GE 15207 timer 277 volt 3-phase GE 15207 3-phase
Larger image

277-480 volt 3-phase

Wire GM40 controls 3-phase
Use 277V
480V contactor or 277V contactor
Fused disconnect required on 3-phase and timer wires
277-480 3-phase
How to wire 3-phase timer
See more 3-phase

120 Volt

Step 5b: 

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

GE 15207 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

120 Volt either-or


Timer wired to control 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
Step 6: How to set timer

See GE 15207 manual


Rotate dial to set time of day.
48 segments around dial divide 24-hour day into half-hour periods.
Photo shows all segments down.
> segments up = timer on
> segment down = timer off




Timer for water heater
See timer circuit

More photos of 15207

How to wire EH40 off-peak timer

How to wire off-peak water heater

Additional links
How to wire Intermatic T100 series and T170 series timers
How to wire Intermatic Sprinkler timers
How to wire WH40, EH40, EH10, WH21 timers
How to wire Intermatic ET series timers
How to wire Intermatic GM40 and WHQ timers
How to wire T1906, T1905, T1975, T1976 timers
How to wire Intermatic ST01C, Ei600, EJ500 timers
How to wire Intermatic/Malibu timers
How to wire Intermatic FM1 timer
How to wire Intermatic PB300 series timer
How to wire Intermatic whole house surge
How to wire remote control timer
How to wire 3 phase timer
How to wire GE 15312 timer
How to wire GE 15207 timer
How to wire GE Box timers

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Resources:
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