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How to wire T101 timer\

40 amp for timer lights, motor, water heater, pump etc
water heater timer
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Indoor metal box
Buy:
T101 series at Amazon

Resources
Sell sheet with model numbers
Replacement clock motor
T100 series repair parts
How to operate and set T101 timer

T175 timer
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Indoor metal box/ day skipper
Lets you skip one or more days per week
Buy:
T171 at Amazon
T 104R
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Outdoor metal box
Buy:
T101R at Amazon
T 104R
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Outdoor metal box/ day skipper
Buy:
T171R at Amazon
T171RCR carry-over
T101M
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Mechanism only
Use thumb spring located top inside timer to remove old mechanism from enclosure
Buy:
T101M at Amazon
T101P timer
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Outdoor plastic box
Buy:
T101P at Amazon
Outdoor plastic box/ see thru door
Buy:
T101PCD82

T101R3
T101R3 Outdoor metal box
Buy:
T101R3 at Amazon
T101R210
T101R201 Outdoor metal box/ With fireman switch
Buy:
T101R201 at Amazon

T101P201 Outdoor plastic box/ With fireman switch
Buy:
T101P201 at Amazon


Resource:
T101R201 manual
Pool timers

T101 wiring
T-101 timer 120Volts
Illustration from product manual
Clock motor connects to Terminals A and 1

Resources:
T101 series
T171 skip-a-day series


How to find Hot wire

T-101 timer 120Volts

T-101 timer for 120 Volt water heaters

T-101 SPST [single-pole single-throw]
Black Hot wire must connect to pole 1.
Neutral must go to pole A
Black to Load goes to pole 2
White to Load goes to pole A



T101 timer for 3 phase
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T-101 timer controls 3-phase
Use T101 120Volt timer to control 3 phase loads.
Same wiring diagram as above can control 3-pole contactor.
Neutrals connect to terminal A
Hot from breaker connects to terminal 1
Hot to contactor connects to terminal 2
No fuse required on incoming line.
Fused disconnect required on 3-phase line and timer in most commercial applications

Resource:
3-pole contactors
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T-101 timer controls any voltage/ single-phase or 3-phase

The 2 and 3-pole contactors with 120 volt coil can be used to switch any voltage and amperage load on-off.
This gives switching control for 208-240-277-347-480 volt,50-60-90 amp 3 phase or single phase loads.
Buy contactor with 120 volt coil, and match the amp rating of contactor with the amp rating of load.
Fused disconnect required on 3-phase line and timer in most commercial applications

Resource:
More 3-phase timers
Method 1: change clock motor
to 240Volt
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T-101 timer  240 Volts
Convert T101 into T102 timer to control 240Volt load:
Replace 120volt WG1570 clock motor with WG1573 clock motor. Connect new clock to same terminals A and 1.
240V: L1 Hot from breaker connects to terminal A; L2 Hot from breaker connects to terminal 1
240Volt wires going to Load connect to terminals A and 2.

T-101 changed to 240 V (207-277)
Buy:
WG1573 for 60 Hz 208-277V Amazon
Method 2: Wire timer for 240Volt
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Override with switch
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Override T100 series timer with 40 amp switch
T100 series timers are rated 40 amp, 5 HP max

Using a 40 amp motor control switch allows you to override any load that the timer successfully controls. Install switch inside any switch box.

Watt or power consumption should appear on rating plate for each Load (motor, fan, lights, appliance etc)
Divide watts by the voltage ... in this case, the voltage for T101 is 120
... so if load consumes 3500 watts divided by 120 volt = 29 amps.
This is within the 32 watt safe maximum of any 40 watt switch (safe maximum = 40 amps x 80% = 32 amps)

Buy: 40 amp switch with 32 amp safe max
Motor switch
MS302 30 amp 2-pole switch

Buy 30 amp switch with 24 amp safe max:
30 amp motor switch
30 amp 2-pole switch
30 amp industrial grade
Leviton 3033 switch
30 amp 3-way switch
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Override T101 using 40 amp contactor and freeze thermostat
--A freeze thermostat or freeze switch will turn Load ON when temperature drops below 40°F, and then turn off when temperature rises again.
-Low cost way to turn on pool or irrrigation pump or heater etc when freezing temperatures are expected.
Note the contactor coil should be 120 volt, or same voltage as timer.
-When temperatur drops, then the freeze thermostat completes circuit to the contactor coil. Contactor coil pulls the switching terminals together, and overrides the timer, turning on the Load.
-Contactor is approx 2" wide, 2.3" long, and 2.6" tall.
-There is generally NOT enough space in the wiring compartment of T101 to add a contactor. The contactor must be installed inside an electrically rated enclosure.

Buy:
2T2485GA enclosureFreeze thermostat
Contactor 40 amp 120 Volt coil
Packard contactor
Mars 2-pole and 3-pole contactors
Terminal kit
Blue terminals for 16-14 wire
Separate enclosure

Resources:
Enclosures
Contactors and contactor wiring

T101B Wiring begins here
Applies to T101B with separate wiring terminals
T101B wiring T101B timer / SPST / 40 amp/ 120V clock/ independent switch terminals control any voltage
120Volt clock motor
Buy:
T101B       120V SPST separate load terminals/ at Amazon
Resources:
T100 series sell sheet
T101B manual/ pdf
T101B timer
Note:
You can accomplish same wiring using T104 timer & change clock motor
You can accomplish same wiring using T103 timer

Other timers and options
Intermatic P1353 timer
See P1353 manual and wiring

Alternative timer

Buy:
P1353 timer at Amazon
PE153 at Amazon

Resources:
P1353 manuals and wiring
For 1 and 2-speed pumps that do not run continuously, install P1353 timer.
Snaps into any Intermatic enclosure
2T2485GA enclosure

Convert indoor timer into outdoor timer:

Buy different enclosure

Buy:
2T2502GA beige plastic Outdoor box at Amazon

Resource
Enclosures
2 speed motor wiring
2-speed motor wiring larger
Resources:
Other 40 Amp timers can control 2-speed pump:

Intermatic GM40
GE 15207
Tork DTU40
Intermatic T1906 20 amp timer

Wiring Tips
Keep wires straight
Use solid copper wire
If wiring terminal  or end of wire are covered with green, use emery board to clean terminal and sandpaper to clean wire.

Insdulation under screw plate
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Both wires MUST be same gauge
Straighten each wire
If wire is corroded or overheated, clean the end with sandpaper and wipe with cloth.
If wire has been melted, cut back and reattach, or replace wire.
Tighten screw very tight against copper wire


Use wire connector  
Push on wire connectors
Use push-on wire connectors
3 wires/ or different gauge wires
Join wires with wire connector or push-on connector
Run jumper to screw terminal.
Buy:

Red 3P connector (shown) for 10-14 gauge wire
Lever connectors for stranded wire
Fire safety/ Do not put stranded wire under screw plate
Do not install stranded wire under screw.
Problem1: picture shows 2 different gauge wires under screw plate
Problem2: Stranded wire will expand and contract and come loose under screw plate, even if it is the only wire under the screw plate
Attach stranded wire and solid wire with wire connector, and run solid copper jumper wire to screw terminal
Take photo of wires before starting.

Resources:
Timer caught fire
Load ratings for Intermatic timers/ pdf


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Installation tips
-Secure wire or conduit to enclosure. All wires, enclosures and conduit must be secured to structure.
-Always use solid copper wire under timer screw terminals ... stranded wire can come loose and cause fires.
-Keep enclosure door closed to prevent possible fire hazard from spreading.
-Keep insulator over screw terminals to prevent accidental electrocution hazard.
-Install enclosures away from hazards such as lawn mower or machinery.
-Install outdoor boxes in sheltered area if possible and 12" above anticipated snowfall.
-For safety, make sure Load is grounded correctly. People often forget to securely join the ground wires inside timer because wire sometimes gets a bit short. Buy extra length of wire from box store. Load must be grounded. Why you need ground wire
10-3-wire
10-3-wire  12 Ga
10 gauge or 12 gauge?
Compare your wire with short pieces of 10 and 12 gauge wire from local box store

10 gauge for 30 amp breaker.
10 gauge wire can have black-white and sometimes black-red

12 gauge for 20 amp breaker
12 gauge will have black and white wires

Buy:
Southwire romex cable
Resources:
Match color code and amp rating for wire
Basic house wiring
Add black tape when White wire carries voltage (applies to 208 and 240V circuits)
With 120 and 277 Volt circuits, White wire is Neutral, and Black is Hot
With 208 and 240 circuits, both wires are Hot, and both wires carry voltage
Black tape on White wire identifies wire is Hot and not Neutral
Use correct wire and breaker
Oversized is OK, undersized is hazard
Look at label on load to determind correct size wire and breaker
Watts divided by volts = amps
If Load is 120 volt, and watts is 1500 = 12.5 amps.
Next calculate 80% safe maximum. 20 amp breaker x .80 = 16 amps safe maximum
15 amp breaker x .80 = 12 amps safe maximum
The calculation shows that 4500 watt load requires 20 amp breaker and 12 gauge wire up to 150 feet.
Longer distance, use larger wire and breaker.
Buy from my affiliate links:
Southwire cable and tools
Resource:
Figure volts amps watts

Parts/ change voltage by changing clock motor

Repairs etc
Resources:
Close up photos/ maintenance/ repairs
Troubleshoot T100 series timer
Intermatic clock motor
240 volt replacement Clock motors
Buy:
WG1573 208-277V
WG1570 120V
WG1576 480V
CW190-10 for 24 volt 60 Hz 24V at Intermatic
156T1961A tripper
Trippers
Up to 12 sets trippers can be put on dial
Minimum 1 hour on-off
Buy:

156T1978A T100 series trippers
124T1952 Insulator
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124T2411A insulator pk 25
Insulators
Translucent
>124T1948 single pole T101, T102, T105
124T1948 single pole T171, T172, T175
>Buy:
124T1948 at Amazon

Black rigid
124T2411A  rigid
Buy:
At Amazon
T-104 timer wired for 480 Volts
Buy:
WG1576 for 60 Hz 480V
Change T104 timer 
by changing clock motor
Intermatic clock motor >>>>> Intermatic clock motor
Buy WG1573 replacement 240 volt for ordinary T104
240 volt clock motor






T-104 timer changed into T104-50
50 Hz timer for use in UK, India etc
WG1574-10D motor 50Hz 208-277V Amazon
T104-50
T-104 timer for 120 Volts
Change T104 timer into 120 volt timer
Buy:
WG1570 for 60 Hz 120V
Move clock motor wires to terminals A and 1
How to wire T103
How to replace Intermatic clock motor
T-104 timer for 24 Volts
CW190-10 for 24 volt 60 Hz 24V at Intermatic
Move clock motor wires to terminals A and 1
Buy T104 240 volt clock motor:
WG1573 208-277V Amazon
T101 Wiring: How to wire T101 and T171 series timers
Applies to T101, T101R, T101P, T101PCD82, T171, T171R, T171CR, T101R3, T101P3, T101R201, T101P201, T101M, T171M  see all models
T101B Wiring: How to wire T101B timer
Applies to T101B with separate wiring terminals
T103 Wiring: How to wire T103 timer
Applies to T103, T103R, T103P, T103M, T103PCD82, T173, T173R T173M  see all models
How to wire Intermatic T102: How to wire T102 and T172 series timers
How to wire Intermatic T105: How to wire T105 timer
Nema 1 indoor enclosure/
To convert to 208-277V operation, replace WG1570 clock motor with WG1573 clock motor
How to wire Intermatic T106 timer: How to wire T106 timer
Nema 3R indoor-outdoor enclosure
To convert to 120V operation, replace WG1573 clock motor with WG1570 clock motor
How to wire Intermatic pool timer: How to wire pool timers

More Intermatic timers

Control centers:

Control centers: + manuals and parts

All control centers and parts
Intermatic enclosures
Intermatic/ Grasslin enclosures
Metal and plastic enclosures
Intermatic sprinkler timers and wiring
Intermatic sprinkler timers
How to wire Sprinkler timers + rain sensor + manuals + buying options
How to connect rain sensor when timer does not have rain terminals
How to Set & Troubleshoot Intermatic sprinkler timer/ pdf

GM40 timer  Intermatic GM40AVE    Woods 59402 timer  Tork DTU water heater timer  \
Multi-function timers and wiring 40 amp
Multi function timers and manuals

Intermatic T1906 timers

T1906-5  T1975-6 heavy duty timers 20 amp
Multi function timers and manuals

           Intermatic ET279 timer    Et70215 timer
ET series digital timers/ 20-30 amp/ 120-277 volt/ multi-channel (same timer controls two circuits with different programming)
ET series timers

MIL72E timer     FM1-timer   MIL72A timer   CN101A timer wiring   Intermatic PB300      
Timer modules/ 16 amp/ 12-240 volt
Timer modules/ 16 amp/ 12 to 240 volt



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