Intermatic WH40 Owner's Manual

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