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How
to wire GE 15087 indoor-outdoor water heater timer links on this page
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 Timer safe for 1 residential water heater. |
See
GE 15087 manual See large image 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. |
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Step 2: Dip switches GE 15087 timer can be used for 120V or 240V water heaters > simply change dip switches and select different voltage. Water heater voltage is printed on side of water heater. Match dip switches to water heater voltage. Figure Volts Amps Watts for your water heater Review basic 240V water heater circuit |
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Use romex connector 1/2" & 3/4" knockouts |
 Terminals: TIMER NO NC COM NO2 NC2 COM2 |
Step 4: Wiring
features Four basic features inside 15087 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 |
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 15087 timer is housed in plastic box Ground wire is not connected to box Ground wire travels continuously from breaker box to water heater. |
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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 way to show all options. Timer is open to experimentation by user. |
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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 |
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Step 5b: Wiring diagram for 120V water heater. The black wire is hot, the white wire is neutral. GE 15087 timer is housed in plastic box Ground wire is not connected to box Ground wire travels continuously from breaker box to water heater. |
 | 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 | |
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Step 6: How
to set
timer See GE 15087 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  |
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 How to wire EH40 off-peak timer |
 How to wire off-peak water heater |
 How to install gas water heater |
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 9 ways to save with water heater |
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E-mail: info@waterheatertimer.org Site map |
