GM40 timer
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How to wire GM40    GM40AV    GM40AVE   WHQ series

Also applies to GE15000 series timers, Tork timers, Woods box timers
GM40 timer
Larger image
Permanent ON-OFF override

GM40 120V-208V-240V-277V

Dip switches to select voltage

Buy
Buy GM40 24 hour at Amazon
Buy GM40 7-day at Amazon
GM40 at 1000 Bulbs
Resources
GM40 instruction manual
Sell sheet with model numbers
How to set analog timers
Intermatic timers and manuals
Intermatic WQ timer
Larger image
Permanent ON-OFF override

GMQ 10,000 watt 120V-208V-240V-277V

Dip switches to select voltage

Buy:
WHQ4     120-208-240-277Volt 24-hour at Amazon
WHQ7     120-208-240-277Volt 7-day at Amazon

Manuals/ Resource:
WHQ series sell sheet
WHQ4 sell sheet
WHQ7 sell sheet
WHQ timer instruction manual

GM40 timer
Permanent ON-OFF override

GM40AV 120V-208V-240V-277V

Auto detects voltages

Buy:
GM40AV       120-208-240-277V at Amazon
GM40AVQ       w/ back-up battery at Amazon

Manuals/ Resource:
GM40AV Manual
GM40AV sell sheet

Intermatic GM40AVE
Larger image
Permanent ON-OFF override

GM40AVE digital 120V-208V-240V-277V

Auto detects voltages

Buy:
GM40AVE  120-208-240-277Volt at Amazon
GM40AVE at Intermatic

Manuals/Resources:
GM40AVE manual
GM40AVE sell sheet
FM1D 20 setpoint programming
FM2D 50 setpoint programming

Intermatic timers and manuals
woods wion contactor

Woods 50054 WiFi contactor

WiOn contactor

Buy
WiOn contactor from Amazon

Resource:
How to wire WiOn for 120 volt and 240 volt
Woods 59402 timer
Larger image
Permanent ON-OFF override

Woods 59402 /120V-208V-240V-277V

Select voltage using jumpers

Buy:
Woods 59402 timer at Amazon

Manuals/ resources
Woods 59401 and 59402 manual
Woods timers and manuals
Tork DTU water heater timer
Larger image
Permanent ON-OFF override

Tork DTU digital 120V-208V-240V-277V

Auto detects voltages

Replaces Intermatic GM40E
Buy:

DTU40 At Amazon

Manuals/ resources
DTU40 instruction manual
GE 15136 timer
GE timers and manuals

GE 15135 40 watt 120V-208V-240V-277V

Dip switches to select voltage

Buy:
GE 15135 24-hour/ 40 amp/ outdoor metal box at Amazon
56922 at Amazon

Manuals/ Resources:
GE 15207 manual

How to wire GE indoor 15207

GE 15136 40 watt 120V-208V-240V-277V

Dip switches to select voltage

Buy:
GE 15136/ 7 day/ 7 programs /40 amp/ outdoor metal box

Resources:
GE 15132 manual
How to wire GE 15136

Tork TU universal timer
Larger image
Permanent ON-OFF override

Tork TU series timer

Buy:
Tork TU series DPDT/ 120-277V universal timer at Amazon
Tork P1104-M 240Volt SPDT at Amazon
Tork P1104FM 240V SPDT with fireman switch at Amazon
Buy Tork DTU digital timer at Amazon

Manuals/ Resources:
TU sell sheet
Sell Sheet
TU wiring manual
TU instruction manual
GM40 timer

240 Volt and 208 volt

Wire GM40 for 240Volt water heater

Basic 240Volt wiring
Turns OFF both hot wires going to load

Resource
More ways to wire for 240Volt
Figure volts amps watts for water heater
Wire size charts


When using black-and-white wires for 240Volt, add black tape to white wire.

This action will tell next electrician that white wire carries power
GM 40 timer controls 2 water heaters

240 volt and 208 volt

GM40 controls two 4500 watt 240Volt water heaters
Turns off 1 hot wire to each water heater

Use 50 amp breaker and 6 gauge wire to timer.
10 gauge ire to each water heater
Timer not rated for controlling two 5500 watt water heaters

Resource
How water heaters work
How to wire water heaters
Figure volts amps watts for water heater
Two water heaters
Wire sizes

240 volt and 208 volt

GM40 controls two 4500 watt 240Volt water heaters using dry terminals
Set dip switches for 240Volt
Timer can control two different voltages, and two separate circuits.
Both circuits turn ON-OFF at same time.
Control any voltage with dry terminals that are separate from clock terminals
Two separate wires from breaker box.
Turns off 1 hot wire to each water heater

Use two 30 amp breakers and 10 gauge wires when wiring two 240Volt water heaters with element wattage over 3800 watts.

GM 40 timer controls two water heater


240 volt and 208 volt

GM40 controls two 240Volt water heaters

One or other water heater is ON.
Both heaters not ON at same time
Use 10 gauge wire


Resource
Two water heaters


GM40 208-240 controls 3-phase
Larger image

120-208-240 volt 3-phase

Example: High leg delta
GM40 3-phase timer 120 or 208 or 240Volt
3-phase line and timer must have fused disconnect
Resource
See more 3-phase
What is 3-phase

High leg delta
Timer toggle between applainces
Larger image
Buy:
Dishwashers at Amazon

120-240Volts appliances

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.

Resource
Same wiring applies to many timers including Intermatic GE15000 series, Tork DTU40
Other timers can perform same operation such as Intermatic T1905 & T1975

How to wire 240Volt outlets


GM timer controls 2-speed pump
Always check pump voltage and wiring diagram located on nameplate
Pump operates continuously. Install another timer on L2 Hot line to turn pump ON-OFF

240 volt or 208 volt

GM40 controls 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:
Resource
Tork DTU40, GE 15207 series, T106 timer, T1906 timer
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 GM40 timer

Applies to Intermatic WHQ timer and  Tork DTU40 timer and GE 15207 series timers and Intermatic T106 timer

240 Volt  or 208

Intermatic GM series

Use timer for two different temperatures on electric water heater.
This plan allows normal temperate to remain at 120 for saving energy, and then increase temperature to 140F for wash day to kill bacteria. This can also be accomplished with DPDT 340 amp switch.

Either upper thermostat and element have power or lower thermostat 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 thermostat 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.

Resource
How to wire thermostats

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.
How to wire thermostats
How electric water heaters work
How to wire off Peak water heater
GM40 timer wired for 277 volts

277 volt


Wire GM 40 for 277 volt

Set dip switches for 277Volt.
Dip switches must be set before power is applied to timer


Wiring is identical to 120Volt

Resource
How to wire 3-phase timer
Wire GM40 for two 277Volt loads

277 volt


Wire GM40 for two 277Volt loads
Both loads turn ON-OFF at same time
Do not exceed timer 40 amp rating
Volts x Amps = Watts.
Each electrical device has rating plate

Resource
Wire and breaker size charts
GM40 277Volt 3-phase
Larger image

277 volt 3-phase


Wire GM40 controls 3-phase
Use 277V
Or 480V contactor

Fused disconnect required on 3-phase line and timer in most commercial applications

277-480 3-phase
Resource
How to wire 3-phase timer
See more 3-phase
GM40 timer

120 volt


Wire GM 40 for 120Volt water heater

Set dip switches for 120Volt.
Dip switches must be set before power is applied to timer

GM40 120 volt

120 volt 2 loads

Both loads turn ON-OFF at same time
Do not exceed timer 40 amp rating
Volts x Amps = Watts.
Each electrical device has rating plate
3 phase timer
Larger image

120 volt 3-phase

Use GM40 to control 3-phase circuit

Most buildings with 3-phase also have 120Volt outlets.
Use 120volt to power timer. Wire timer as shown in illustration directly above.
Timer opens-closes circuit to 3-pole contactor with 120Volt coil.

Resource
See more 3-phase
Connect power to terminals L1 L2
Other terminals are 'dry'/ receive no power when L1 and L2 are energized
Connect power to COM terminals
NO normally open have no power when timer is OFF
NC normally closed have power when timer is OFF

DC voltage

Wire GM40 timer to control DC motor:

Use same diagram to control any single-phase voltage.

Do not mix different gauge wires under same screws. Smaller wire comes loose, causing sparking and high heat and fire.
Do not mix solid wire and stranded wire under same screw.
Intermatic terminal wires

120 volt or 240 Volt

Off PeakWire GM40 timer to toggle water heater between 120Volt and 240Volt.

Use this technique for peak electric prices.
When prices are peak, set water heater to operate at 120 volts for slower heating. Tank stays hot, but hot water does not recover quickly.
When peak price ends, resume 240Volt operation for faster heat recovery inside tank.

Wiring inside water heater is not changed
Elements and thermostats will work with 120 or 240
This will not work for Whirlpool energy smart water heater

Resource
Off-peak water heater options
cycle timer

Turn Load ON once every 10 minutes for 8 hours per day


Set 120Volt cycle timer for chosen time duration. For example once per each 10 minutes. Or once each 5 seconds. The cycle timer dial rotates continually, and turns load ON-OFF for each cycle.

To operate the cycle timer at different hours, install GM40 timer.
GM40 timer can be installed on the Hot line before or after the cycle timer.

Resource
Read more
CT2000 cycle timer

Intermatic IG1240RC3
Whole house surge
Larger image

Surge

Resource
Whole house surge protector
How to wire whole house surge protector

Digital timers should be protected from surge.
Same with any water heater that is plugged into outlet.
All new appliances and water heaters with digital controls are vulnerable to surge
Control 2 water heaters
Larger image

Control 2 water heaters using 2 EH40 timers


Each water heater can have different 7-day schedule

10 gauge wire and 30 amp breaker run cooler.
30 amp circuit breaker and 10 gauge wire for water heater runs cooler with less energy loss. Breaker box lasts longer.

Different wiring:

For two 4500 watt water heaters, you can use one 40 amp breaker and 8 gauge wire to bring power from breaker box to the first timer.

For two 5500 watt water heaters, you can use 50 amp breaker and 6 gauge wire

Resource
Water heater timers
EH40 water heater timer
Things you can do to increase amount of hot water

9 ways to save with water heater

Basic household wiring
Basic water heater circuit

Figure volts amps watts for electric water heater
Test elements
Replace elements
How to wire tankless electric
How to change water heater temperature using timer
Change water heater from 240Volt to 120Volt
Replace thermostats
How to wire thermostats
How to wire water heater for off peak operation

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

How to wire dimmer
How to wire 3-way dimmer
How to wire occupancy switch
How to wire motion detector
How to wire TM811 and TM8111 switches
How to wire wall timers
How to wire box timers
How to wire off-delay timer
Wire off-delay timer
How to wire pin timers

How to wire and troubleshoot photo eyes
Reverse photoeye so it turns on in day
24 Volt photoeye
24 volt programmable timer

How to wire switches
How to add switch
How to add 3-way switch


Timer for 3-way switch
Timer for 4-way switch

How to add outlet 
How to wire 3-way switches
How to wire 4-way switches


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

Electrical formulas
Electricians forum
 

Electrical pages


How to wire arc fault breaker
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
Wire connector

How to wire 240volt outlets
How to install 3-phase timer
How to wire 3-phase outlets
How to wire 3-phase surge protector
What is 3-phase

How to wire whole house surge protector
How to wire under-counter water heater
 

See inside main breaker box
Replace breaker
Install subpanel

Fuseholder
Contactors
How to solder wires
Whole house surge protector
3-phase surge protection
Circuit breakers

Difference between 120 volt and 240 Volt
Difference between 50Hz and 60Hz
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
Intermatic timer enclosures

Convert AC water heater to DC
How to wire DC solar water heater
DC relays for solar water heater
How to add another thermostat to water heater

How many Kwh to heat water
Chart for figuring heating time for electric heater

Gas and electric water heaters Buy
Industrial electric


Industrial supplies

Tools and home improvement

Lab and scientific
Intermatic control centers Resource:
Intermatic control centers:
+ manuals and parts


Including Z-wave
box timers Resource:
Compare box timers

Compare ways to control Gas and Electric heaters
programmable timer Resource:
Compare programmable timers
Compare countdown timers

Control water heater with programmable wall timer

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