Electrical
1.
Check to
see
that the element marking and nameplate
data correspond with the electric service available. The
junction box where electrical connections are made
is
located near the top of the heater, near the upper access
door.
2.
Install a circuit directly from the main fuse
box.
This cir-
cuit must
be
the right size for the length of
run
and
the
load (see Table 1).
MAX.
MAX.
VOLTS
WATTS
120
V
208
V
240
V
1500
20A
10A
10A
3000
35A
20A 20A
3500
40A
20A
20A
4500
30A
25A
5500
35A
35A
NOTE: Water heater must
be
well grounded to the elec-
trical supply service.
Table 1 Power Requirements
3.
A ground wire must
run
from the green ground screw
provided at the electrical connection point
in
the heater
junction box to the ground connection at the service
panel.
4.
Adequate fusing must
be
provided at the service
entrance
as
required
by
local codes and/or electric utility
having jurisdiction. This can be accomplished with either
a circuit breaker or fuse block
in
the service panel or a
separate disconnect switch, so that electric power
can
be
shut off easily when working
on
the heater.
5.
Final connections are made at the junction box
in
the
heater. Access to the junction box
is
obtained
by
remov-
ing
the cover near the knockouts.
6.
The heater you have received
is
internally wired. A spe-
cific wiring diagram
is
located inside the upper door or for
certain models
on
the rating plate. All wiring
is
colour-
coded and connections must
be
made as shown
in
the
wiring diagram.
Wiring
TWO WIRE CIRCUIT FOR NON-SIMULTANEOUS OPER-
ATION. SINGLE HIGH
LIMIT.
The basic operation of a two-thermostat system (upper
and
lower)
on
an
electric water heater of 240 volts
is
as
follows:
Only one element will come on at
anyone
time. This
is
known
as
a flip/flop system.
On
a 240 volt water heater,
there will always
be
120 volts to both elements. The ther-
mostat will direct the second
leg
of the 120 volts to the ele-
ment to complete the 240 volts required for energizing the
element.
Initial
Start Up: When the tank
is
full of cold water, the
upper thermostat will.take priority
and
the top portion of the
water will heat up to the setting of the thermostat. Once that
temperature has been reached, the thermostat will then flip
down the 120 volts to the lower thermostat. The thermostat
switch closes and the bottom portion of the tank heats
up
until the water reaches the setting on that thermostat. At this
point the tank will
be
full of hot water.
TWO WIRE CIRCUIT FOR SINGLE (1) ELEMENT HEATERS EQUIPPED TH
SINGLE (1) HIGH-LIMIT CONTROL. SPACESAVER'" MODELS
ON
L
Y.
INCOMING
SUPPLY
i~BLACK
JUNCTION
BOX
WATER HEATER MUST
BE GROUNDED TO THE
ELECTRICAL SUPPLY
SERVICE.
~\
ELEMENT )
\
0-,f-----J
Figure 1 Single Element Wiring
HIGH-LIMIT CONTROL:
r,!::-----;!",
BOTH
N/C's
OPEN
AT
180°F
THERMOSTAT:
'-'liif---->..:
.....
N/C
- OPENS WHEN
rIIII---,
TEMPERATURE
REACHES SET POINT
+--+
--J
I
TWO WIRE CIRCUIT FOR DUAL (2) ELEMENT HEATERS EQUIPPED WITH A
SINGLE (1) HIGH-LIMIT CONTROL. NON-SIMULTANEOUS OPERATION.
INCOMING
SUPPLY
JUNCTION
BOX
+---+=:-:--=:-:-_---..J
WATER HEATER MUST
BE GROUNDED TO THE
ELECTRICAL SUPPLY
SERVICE.HIGH-LIMIT CONTROL:
BOTH
N/C's OPEN
AT
r±---'!"","
180°F. RED
BunON
RESETS BOTH CIRCUITS
UPPERTHERMOSTA~'-'liif~~
N/C
- OPENS.
N/O
CLOSESrIIII--:-:-::=::o
WHEN TEMPERATURE
REACHES SET POINT
i~BLACK
I
UPPER
ELEMENT
LOWER THERMOSTAT:
N/C
- OPENS WHEN
TEMPERATURE I
REACHES SET POINT
LOWER
ELEMENT
Figure 2 Double Element Wiring
-5-
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