Search 
sitemap button
Search using google with ads
  
 Tweet button  
Follow newest ideas on Pinterest
How to wire Intermatic T104 / 208-240-277 volt
40 amp/ 240 volt/ 7680 watts safe maximum for continuously operating/ max 9600 watts/ up to 5 HP

Links for wiring 110-125 volt T101 & T171,  T103 & T103BT105
Links for wiring 208-240-277 volt T102 & T172T106 timers
2023
water heater timer
Large image
Indoor metal box
Buy:
T104 series

Resource:
T104 manual
How to operate and set T104 timer
Sell sheet with model numbers
close photos of WH40 (same as T104)
How to maintain T100 series timer
Troubleshoot T100 series timer

T176 timer
Larger image

Indoor metal box/ day skipper
Buy:
T174
T101M
Larger image

Mechanism only
Buy:
T104M
T 104R
Larger image

Outdoor metal box
Buy:
T104R

T 104R
Larger image

Outdoor metal box/ day skipper
Buy:
T174R
T174CR with carryover
T104P timer
Larger image

Outdoor plastic box
Buy:
T104P
Buy:
T104PCD82

T104R3
Large image

T104R3 / T104P3
Outdoor metal OR plastic Beige-colored box
Buy:
T104R3 metal box
T104P3 plastic box
Resource:
Intermatic pool timers and manuals
T104P201
Large image

T104R201 / T104P201
Outdoor metal OR plastic Beige-colored box
with fireman switch
Buy:
T104R201 metal box
T104P201 plastic boxat Amazon
T104M201
T104M201 mechanism with fireman switch
Buy:
T104M201 mechanism with fireman

Use only 600 volt wire.
Lamp cord, extension cords are not rated 600 volt.
Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional.

30 amp breaker use 10 gauge /
120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.

Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps.
Buy:
10-2 gauge/ 30 amp
10-3/ 30 amp
Southwire electric tools
Yellow 12 gauge 20 amp
120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire.
... cannot be connected to 30-40 amp breaker. 1

Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps.
Buy:
12-2 gauge/ 20 amp
12-3/ 20 amp

NMB is house wiring
UF is underground
Rolls of stranded wire
HOOK UP Wires
50-60 amp breaker use 6 gauge /
240 volt 50 outlet can be installed on 50 amp breaker only
6-2 wire
Buy:
6-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
40-50 amp breaker use 8 gauge /
240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only
6-2 wire
Buy:
8-2 wire
Southwire electric tools
NMB is house wiring
UF is underground
multimeter
Multimeters
Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire.
Buy:
Analog multimeter
Multimeters
Klein multimeter
Electric testers
Clampmeter for testing amp flow on line
Southwire armored cable cutter
Electrical tools must be insulated.
Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off.

Buy:
1000 volt Tool kit
Electrician tools kits
KLEIN TOOLS
Tools kits
IRWIN tools
KNIPEX

Telephone cable knife
Low Voltage Mounting Bracket for Telephone

T104 Wiring begins here
Applies to T104, T104R/P, T104-50, T104M, WH40, T174, T174R, T17P, T174M, T104R3, T104P201, T104R201, etc
Resource: See all models

How do you know if you have T104: Look at door label on inside of timer door. No label? Then read more
Is power connected to double pole circuit breaker?
Are there 5 screw terminals on timer?
Are white clock wires on terminals 1 and 3?
Is clock motor WG1573?
If yes for all, then you have T104
Intermatic T104
Larger image
Full image
T-104 timer 240Volts or 208 Volts
Check label on side of water heater for Volts & Watts

T104 has two sets of switch terminals: 1-2 and 3-4
When timer turns ON, then terminal 1 sends power to to terminal 2 ... and terminal 3 sends power to terminal 4.
Buy:
T104 uses WG1573 clock motor

Resources:
T104 manual
T100 series sell sheet
Repair part list
Replacement clock motors
How to find Hot wire
Solid copper wire only
Note the insulation is cut back away from screw terminals.
Do not score or cut into copper when stripping wire.
Use wire stripper and not knife.
Do not install with insulation under screw terminal.
Tighten screws very tight against solid copper wire.
Use screwdriver that fits screw head.
Undersized screwdriver will cause loose wire, fire, and melted terminal.
Buy tools:
Wire strippers
Linesman pliers
Utility knife 
Larger image
T-104 same wiring as shown above
Wiring applies to 208-240 volt applications

Clock motor is connected to terminals 1 and 3.
Wires from breaker are also connected to terminals 1 and 3 so clock motor runs continuously.
Clock motor wires can be moved to achieve other wiring objectives.

Same wiring applies to T174, WH40
Resource
What is 208 volt
T104 controls two loads

Larger image
T-104/ Two 240 Volt loads
or Two 208 Volt Loads
Move motor leads to terminals A and 1
Turning off 1 Hot wire will turn off 240Volt circuit.
Safety
Note the T100 series timers are rated max 40 amp per pole ... a pole could be interpreted to mean a switching terminal or a screw terminal.
If you are trying to control two 40 amp loads, then two timers are required.
40 amp + 40 amp = 80 amp .... 80 amp breaker would need size #2 wire ... see chart
The maximum wire size that T100 series terminals will fit is #8 wire supplied from 40 amp breaker.
The evidence and rating tell us that maximum for the timer ... no matter how many loads are controlled ... is 40 amps.
Yes, the loads can be spit into 10 amp and 30 amp ... but be careful with wiring ... so only two wires are under each screw terminal, and both wires are solid copper and same gauge.

If you want both Loads to turn on-off at different times, then you need two timers, or digital timer with two-channel capability such as GM40AVE, GMX2FM2, ET1100, ET1700, P1353
Resources
40 amp GM40 AVE
30 amp ET series timers
20 amp P1353

 Add tape to white wire, when using black-and-white wires for 240Volt,
This will notify next electrician that white wire carries power

240Volt wires can be
Black-White
Black-Red
1) Control 120Volt Load using T-104
2) Control 2 - 120 Volt Loads
3) Rewire timer

4) Rewire timer + change clock motor to WG1570 120V

Use this diagram to control 3-phase using T104 timer
T-104 timer controls 120 Volts
Each single phase household circuit takes 2 wires to complete the circuit.

120V takes one 120V hot wire and one neutral wire to complete circuit.

240V takes two 120V hot wires: One 120V hot wire from each busbar to complete circuit.
Read difference between 120 volt and 240 volt

Change clock from 240V WG1573 to 120V WG1570
Buy: 120Volt clock motor:
WG1570 for 60 Hz 120V
T104 controls any voltage
Larger image
T-104 controls any voltage/ 120 volt, 480 volt, 12-24 volt, 277 volt using dry terminals

Move motor leads to terminals A and 1
Connect 240 Volt to A and 1 so clock motor runs.
Connect any voltage to terminals 3 and 4/ and timer will switch terminals on-off 1-12 times per day depending on how many trippers are installed on the yellow clock face.

Dry terminals 1-3 means no voltage is on terminals 1 and 3 unless a wire carrying power is connected.
This means you can bring in 120 volt Hot wire and connect it to terminal 3, and it will remain insulated (separate) from the 240 volt on terminals A-1
When the T104 is wired like this,, the switching terminals 3-4 are dry.
This means you can use the timer to switch any voltage ...
T104 is rated for 24 volt AC or DC, and AC voltages 120-208-240-277-480 volt.

Safety note: Low voltage (12-24 volt etc) wires must be insulated away from high voltage (120-240) wires. Technically, both sets of wires must be separated by electrically rated partition so that insulation failure, loose wire, short circuit etc cannot energize the low voltage lines.

Larger image
T-104 controls any voltage/ 2 loads
Move motor leads to terminals A and 1
Connect 240 Volt or 277 Volt to A and 1

Resources:
Motor wire and amp charts

Wire T104 timer for 277 volts
Larger image
Intermatic T102 wiring
T-102 timer is pre-wired for this installation
See more T102 wiring
T-104 277 Volts
Move motor leads to terminals A and 1

Terminals 3 and 4 are dry (have no voltage) in this configuration, and can be wired to control any voltage, or jumper hot wire between terminals 1 and 3

277 Volt timer can be used to control 3-phase 3-pole contactor

Commercial 277-480 volt power is extremely dangerous and should only be wired by professional electrician with experience in commercial voltages
Resources
How to install 3-phase timer
What is 277 volt

T104 controls two 277 volt loads
Larger image
T-104/ Two 277 Volt loads
Move motor leads to terminals A and 1
Add jumper from terminal 1 to terminal 3

Commercial 277-480 volt power is extremely dangerous and should only be wired by professional electrician with experience in commercial voltages

Resources
Difference between single-phase and 3-phase
What is 277 volt
Intermatic timers and manuals

T104 timer wiring
Larger image
T-104/ 480 Volt load
Install new clock motor rated for 480 volt
Volts x amps = watts (or power output).
480 volt power x 40 amp timer = 19,200 watt capacity
80% safe maximum  x 19,200 = 15,360 watt capacity

Commercial 277-480 volt power is extremely dangerous and should only be wired by professional electrician with experience in commercial voltages

Buy:
480 volt clock motor

Resource:
How to wire 3-phase
T104 480 volt
Larger image
T-104/ 480 Volt load
Install new clock motor rated for 480 volt
Move motor leads to terminals A and 1

Use dry switching terminals to control another load.
Local electrical codes for commercial wiring will determine which voltages can be used.
480 volts carries twice the power of 240 volt, and can deliver more power per amp than lower voltages. Since volts are the force that push amperage (electrons) through the wire, the added power make 480 volt extremely dangerous, and therefore must be installed correctly to meet safety standards.

Commercial 277-480 volt power is extremely dangerous and should only be wired by professional electrician with experience in commercial voltages

Buy:
480 volt clock motor

Resource:
How to wire 3-phase

T104 timer 3-phase
277V
Larger image T104 controls 277 Volt
T-104 timer controls 3-phase

Control 480-277Volt 3-phase : use 277 Volt wiring shown above and use diagram on left
Control 208 Volt 3-phase : Use 240-208 Volt wiring above or diagram on left
Control 240Volt 3-phase : use 240 Volt wiring above or diagram on left

Fused disconnect required on 3-phase line for commercial applications

Buy:
3-pole contactors
Fused disconnect
Fusable Safety switch

Resources:
How to wire 3-phase timer
Difference single-phase and 3 phase
How to wire fused disconnect / safety switch
T104 208-240 3-phase
208-240V
Larger image 208-240 volt 3-phase
480 Volt timer
Larger image
T-104 timer controls 3-phase 480Volt
480Volt timer
Control 480 V 3-phase using T104 timer
Change 240V WG1573 clock motor to WG1576 clock motor
Fused safety switch or disconnect required
Timer turns on and completes circuit to contactor. Contactor closes points and completes circuit to 3-phase load.
Fused disconnect required on 3-phase line for commercial applications

Intermatic clock motorBuy: 480 volt clock motor for T100 series:
WG1576 480V
3-pole contactors
Fused disconnect
Fusable Safety switch

Resources:
3-phase contactors
How to wire 3-phase timers
What is 3 phase

Intermatic RC939 controls timer  
Larger image            
 RC939 transmitter      RC613 receiver      WH40 or T104 timer
Override timer with remote control
Control 240Volt 3500 watt water heater using Intermatic RC 939 remote control and RC615 120Volt receiver
240Volt circuit can be turned off by turning off 1 hot wire
Do not exceed amp rating of RC615, otherwise install RC613RC relay or PT1203M

Buy:
RC939 3-channel radio transmitter
RC613 receiver

Resources:
Up to 100 feet away
Full product line
RC939 transmitter manual
Remote receiver manual
RC939 3-channel radio transmitter
Fuseholders

Connect T104 to 240 volt GFCI breaker
GFCI 2-pole breaker. Only 1 GFCI per circuit.
Multiple GFCI will cause tripping.
Illustration shows 2-pole 208-240Volt GFCI.
Wires leave GFCI and travel to T104 timer, before going to pool pump.
National electric code requires 2-pole breaker for 240Volt circuit ... cannot use 2 separate breakers to supply 240 volt.
Cannot use 2 separate GFCI breakers to supply 240 volt.
Ground wire not shown. Circuit MUST be grounded
Buy:
240 volt GFCI breaker
GFCI circuit breakers

Resource: How to wire GFCI breakers

Control panel
T10000R series

Ground wire not shown.
All ground wires connect to Neutral-ground busbar
Larger image
T-104 timer 240Volt: Pool control center
Control Centers with busbars for installing BR-type push down circuit breakers.

Breakers are installed and wired exactly like main breaker panel

Control centers have T104, T101, T106 mechanisms to control multiple pool functions such as pool pump, pool filter, pool light, outlets, and pool cleaner. Install extra circuit breaker for outdoor lights etc.

Resources
How to wire Intermatic control center breaker busbar
Control center is a subpanel: How to install a subpanel
See inside main breaker panel
Which circuit breaker for Intermatic

T104 timer and T106 timer together

Problem: The T106 timer is either high or low speed, but never OFF. The pump runs full time.
To solve problem, a T104 is added to circuit.
This means the T106 will toggle the pump between high and low speed.
And the T104 timer turns off the pump.
Note the T104 does not turn off the T106 timer ... instead it overrides the T106 and turns off the pump.

When T104 timer turns off, the pump resumes high-low operation based on when the T106 timer is in high or low.
Normally to accomplish this, the T10604R control center is used ... or you can buy the T106 and T104 separately
Buy:
T10604R with T106 and T104 together  /208-240V for 2-speed pumps
T10004R with T104    /208-240V
T10404R with two T104  / 208-240V
T104 series / buy T104R or T104P with outdoor box
T104R metal outdoor box
T104P plastic outdoor box
T106R outdoor timer

Resources:
T10604 Door label
Intermatic control centers plus manuals and parts
Wiring for two T104 timers
Larger image
Image for two independent breakers
T10404R:   Two T104 timers for filter and cleaner

Filter pump must be ON so cleaner does not burn up
Both clock motors connect to terminals 1 and 3 on filter timer.
Power only reaches cleaner timer when filter timer is ON
Buy:
T10004R with T104    /208-240V
T10404R with two T104  / 208-240V

Resources:
Intermatic control centers
How to wire T10404
How to wire Intermatic control centers
T104 freeze wiring
Larger image SPDT
Larger image SPST
Timer/ freeze control/ and 30 amp switch

178T24 freeze thermostat
T-104 timer 240Volts SPDT: Freeze thermostat
Prevent freezing
The 15 amp 178T24 Thermostat overrides timer using a 40 amp contactor.
Also use illustration above for SPDT, or illustration below for SPST.
When temperatures drop toward freezing, the freeze thermostat override timer operation.

You can substitute a 15 amp freeze switch (shown in illustration below) in place of the more expensive 178T24. Advantage of 178T24 is temperature range adjustment.

Buy:
178T24 thermostat
40 amp contactor with 240Volt coil
Separate enclosure

Resources:
Intermatic freeze controls
178T24 wiring
Terminals
Contactors

Larger image



Override T104 using 40 amp contactor and freeze thermostat
Move clock motor wires to terminals A and 1 for SPST operation.
--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 irrigation pump or heater etc when freezing temperatures are expected.
Note the contactor coil should be 240 volt, or same voltage as timer.
-When temperature drops, then 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 T104 to add a contactor. The contactor must be installed inside an electrically rated enclosure.
-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:
Freeze thermostat
178T24 thermostat
Contactor 40 amp 240 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

T104 timer with freeze control
Larger image

                         
PF1100 series:   T-104 timer 240Volts with Freeze thermostat
PF1112T T104 with freeze thermostat
Prevent pool pump and pipes from freezing
Also use illustrations below for SPDT and SPST
Buy control center:
PF1112T panel/  no breaker slots, 1 timer
PF1222TB1 panel with 4 breaker slots, 2 timers 

Resources:
How to wire PF1100 series timers
Intermatic freeze controls
PF1112T manual
PF1202T manual
PF1102M freeze control pdf
More control centers and wiring
Parts manual
 
240V
Larger image
PF1102/ 240Volt/ freeze thermostat/ with contactor/ in metal outdoor box / 3Hp
Outdoor steel box
Freeze thermostat with contactor + box
Buy
PF1102/ 240Volt/ freeze
Resource
PF1102M manual/ pdf
PF1100 series sell sheet
Sell Sheet
Parts manual
PF1102M
Larger image
240V
PF1102M/ replacement/ with contactor
Mechanism only
Freeze thermostat and contactor/ no box
Buy
PF1102M
Resource
PF1102M manual/ pdf
   
120V
Larger image
PF1103/ 120Volt/ freeze thermostat/ with contactor/ in metal outdoor box/ 1.5 Hp
Outdoor steel box
Thermostat with contactor ... no box
Buy
PF1103

Resource
PF1103 manual/ pdf
PF1102M
120V
PF1103M/ replacement/ with contactor
Thermostat and contactor/ no box
Buy
PF1103M

Resource
PF1103M manual/ pdf


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
Larger image

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


Larger image
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

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
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




Buy
Tools
Milwaulkee
DEWALT
Black and Decker
Stanley
SKIL
Makita
Porter-Cable
Bosch

Irwin Hand tools
Klein hand tools
Fluke electrical testing
Dremel hobby tools

Campbell Hausfeld air powered
Tekton automotive

Powerbuilt automotive
Saws and saw blades

Buy from my affiliate links every time/ thanks:
Amazon
''As an Amazon Associate I earn from qualifying purchases''
Enter Amazon from any link on my site, fill cart with any item ... purchases pay small commission

E-mail: geno03245w@gmail.com
My response might end up in spam folder, check email folders
Waterheatertimer on Twitter
Message thru facebook