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How to wire Intermatic T1905  T1975 series timers
T1905 timer
Larger image T1905-6

SPST with NO NC contacts
20 amp
7-day skipper wheel
Power consumption: Max 5 watts

Same wiring applies to both T1906 series timer and T1976 series timer

Only difference between T1905-6 and T1975-6 is day skipper wheel on T1975-6

Buy timer:
T1905 series 120Volt 20 amp 1 Hp timer at Amazon
T1905 480 Volt timer at Amazon
T1906 series 208-240V 20 amp timer at Amazon

Parts/ convert timer to different voltage by changing clock motor
125Volt WG730 motor at Amazon
208-240volt WG733 motor at Amazon
480V WG736 clock motor at Amazon

Manuals/ Resources:
T1905 manual
T1906 manual
T1900 series sell sheet
T1900HD series sell Sheet
How to replace Intermatic clock motor
All Intermatic timers and manuals
Troubleshoot Intermatic timers
Intermatic trippers and parts
Intermatic T1906
Large image T1975-6
Larger image T1975ER

SPST with NO NC contacts
20 amp
7-day skipper wheel
Power consumption: Max 5 watts
T1975   T1976  w/ day skipper wheel
SPST with NO NC contacts
20 amp
7-day skipper wheel
Buy timer:
T1975 series 120Volt 20 amp with day skipper at Amazon
T1975E 480Volt with day skipper at Amazon
T1975ER 480-Volt Time Switch 3R Outdoor Enclosure w/ day skipper at Amazon
T1976 series 208-240Volt 20 amp timer with day skipper at Amazon
Parts:/ convert timer to different voltage by changing clock motor
125Volt WG730 motor at Amazon
208-240volt WG733 motor at Amazon
480V WG736 clock motor at Amazon
156T1954A skipper pins
133T698A replacement snap switch at Beverley Hills

Manuals/ Resources:
T1976 manual
T1975 manual

T1900 series sell sheet
T1900HD series sell Sheet
Troubleshoot Intermatic timers

T1075 skipper wheel
7-day skipper wheel
Larger image
T1900 Heavy duty series
Larger image T1075EHD
Larger image T1905HD

T1905HD 125V heavy duty

T1975EHD 480V heavy duty

With day skipper
24 hour timer
NO NC contacts
20 amp
Motor withstands surge up to 6000 volts

Long life under extreme conditions
96 trippers 15 minute increments
Permanent built-in trippers
Permanent manual override: Full ON or Full OFF
T1905HD

Buy Timer:
1906HD heavy duty 125 volt at Amazon
T1975EDH heavy duty 480Volt with day skipper at Amazon

Resources:
T1900HD series sell Sheet with wiring
T1975EHD sell sheet
Instruction manual
Same wiring as T1905 and 1975 shown above

Buy:
T1975EHD 480Volt heavy duty captive trippers with day skipper at Amazon
T1905 HD 120Volt heavy duty captive trippers with day skipper at Amazon

Same wiring applies to both T1906 series timer and T1976 series timer


Normally Open turns on with timer settings
Normally Closed turns off with timer settings

Larger image

208-240Volt/ or 480 Volt

T1906 and T1976 control 240Volt Load

Same wiring applies to 208 thru 240Volt
NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Use 12 gauge wire for 20 amp timer

SPDT single pole, double throw.
Only one Hot leg is turned off.

Larger image

120 Volt

Same wiring applies to T1905 timer and T1975 timer

Only difference between these two timers is the day skipper wheel on T1975

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

Timer turns off Black hot wire, so 120V water heater has no electricity when timer is off.

Wires at 120V water heater: Connect black-to-black and white-to-white wires at water heater.

T1905 controls 2 loads

120 Volt/ control 2 loads

Same wiring applies to T1905 timer and T1975 timer

Only difference between these two timers is the day skipper wheel on T1975

NO terminal is normally open. NO turns 'on' with timer settings. This terminal used for water heater circuit shown on left.
NC terminal is normally closed. NC turns 'off' with timer settings.

For T1906 and T1975, White wire is Hot
For T1905 and T1975, White wire is Neutral

208-240V / or 480V control Two Loads

T1906 and T1976 control two Loads

Each Load is same voltage ranging from 208Volt to 277Volt
Neither Load is turned ON at same time. Either NO Load or NC Load is active, but not both same time.

Bare ground wires connect to green screw.
When using White wire to carry Hot, then add black tape to tell next electrician that wire carries voltage.

To control different voltages, use timer with dry terminals such as GM40. How to wire GM40
T1906 timer controls 2-speed pump
Larger image

208-240V/ 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.
Always check pump voltage and wiring diagram located on nameplate
Other timers can be used for 2-speed pool pump:
Intermatic GM40, GE 15207 series, T106 timer, Tork DTU40 timer
Pump operates continuously. Install another timer on White Hot-neutral line to turn pump ON-OFF
Buy Trippers 12 pack
156T1950A trippers at Amazon

How to set timer:
Insert trippers into dial. Push tripper fully down. Each tripper represents 15 minutes. Standard package arrives with 12 trippers. Insert 12 trippers in a row represents 3 hours. Insert 4 trippers in a row represents 1 hour.
Trippers push on-off lever. The on-off lever opens and closes electrical contacts that send power alternately to NO terminal or to NC terminal.
Either the NO terminal has power -or- the NC terminal has power. One terminal or the other terminal is ON at all times, and when one terminal is ON the other is OFF.
To set time: Rotate dial until current time lines up with stationary silver pointer or timer arrow.
Use manual override lever to reverse on-off operation. Timing sequence resumes at next tripper.
Remove all trippers to override timer operation.
Intermatic clock motor Clock motors
125Volt WG730 motor at Amazon
208-240volt WG733 motor at Amazon
480V WG736 clock motor at Amazon
Intermatic control centers Intermatic control centers:
+ manuals and parts


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