WH40
WH40 ELECTRIC WATER HEATER TIME SWITCH
DOUBLE POLE, 10,000 WATTS (40 AMP) MAX., 250 VOLT - 60 HZ.
CLOCK
This Time Switch will repeat a preset schedule daily,
except when the EXTERNAL MANUAL LEVER
is used. This manual lever permits the user to
turn the water heater ON and OFF ahead of the
schedule. The Time Switch will resume the preset
program by the next scheduled ON or OFF operation.
NOTE: The manual lever is inoperative for 15 minutes
immediately after the automatic operation.
The diagram on the right shows the mechanism
DIAL
TIME
POINTER
GROUND
SCREW
MOTOR
CHECK
HOLE
TRIPPER
MANUAL
LEVER
LR3730
and wiring of this Time Switch. The TIME POINTER
is used to line up the correct time-of-day on the
CLOCK-DIAL. The ON and OFF TRIPPERS turn
water heater ON and OFF at the times indicated by
their respective position on the CLOCK-DIAL.
TO SET PROGRAM...First, mount silver finished
(ON) trippers at times you wish water heater to start
operating. Place black (OFF) trippers at times you
want to turn water heater OFF. Fasten trippers to dial
GRD
NEUT
LINE 1
LINE 2
120 240V
FROM
FUSE
BOX
NOTE: CLOCK MOTOR LEADS ARE PREWIRED TO TERMINALS 1 & 3
NEUTRAL (WHITE) IF PRESENT
GROUND (GREEN OR BARE)
TO
WATER
HEATER
by pushing them against the edge of the clock dial, then turning screws TIGHT with fingers.
Second, PULL clock dial out (toward you) and turn in either direction until correct time-of-day (the time now,
when switch is being put into operation) is directly under the time pointer. Do not move pointer.
Third, close Time Switch cover. Make sure it is latched and locked, if needed.
AFTER POWER FAILURE (or if water heater was disconnected at the main panel), you must reset clock
dial to the proper time-of-day.
TO SUSPEND AUTOMATIC OPERATION - Remove trippers from dial. Set manual lever as desired.
CAUTION: Always disconnect power at main panel before servicing this Switch or the water
heater.
INTERMATIC INCORPORATED
158WH11272
SPRING GROVE, ILLINOIS 60081-9698
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