21
Transformer Wiring
120 VAC Wiring
For 120 VAC input power to the unit, connect the black
wire to the L1 or hot leg of the power supply. Connect the
white wire to the “Ret” or neutral leg of the power supply.
There should be no connection to the red wire for 120
VAC operation.
Attach a wire nut to the red wire.
SUPPLY
SIDE
RETURN
or
NEUTRAL
HEATER
4 WIRES
GROUND
L1
RED
BLACK
HOT
BLACK
GREEN
GREEN
WHITE
WHITE
Figure 25. 120 VAC Wire Connection
240 VAC Wiring
For 240 VAC input power to the unit, connect the black
wire to the “L1” or hot leg of the power supply. Connect the
red wire to the L2 or second hot leg of the power supply.
There should be no connection to the white wire for
240 VAC operation.
Attach a wire nut to the white wire.
A
WARNING:
DO NOT attempt to operate the heater
at 208 VAC.
HEATER
4 WIRES
L1
L2
RED
RED
BLACK
HOT
HOT
BLACK
GREEN
GREEN
WHITE
SUPPLY
SIDE
Figure 26. 240 VAC Wire Connection
Heater must be electrically grounded and bonded in
accordance with local codes, or, in the absence of local
codes, with the latest edition of the National Electrical
Code, ANSI/NFPA 70. (Canada - Canadian Electrical
Code, CSA C22.1, Part 1 and Part 2.)
A
CAUTION:
If the transformer’s primary side is wired
for 120 VAC and 240 VAC is applied, damage to the
transformer and PC board may result. Such damages
are not covered under manufacturer’s limited warranty.
NOTE:
Input power to the heater (120 or 240 VAC) can
be supplied from the load (pump) side of time clock or
directly from the GFCI power source.
It is preferred
that full-time power be supplied to the heater from
the GFCI power source, and that the heater be
controlled by the fireman’s switch connection or
using a two or three-wire remote.
If using a switched
GFCI power source, the heater could display false
service indicators on the display panel if the pump is
turned off.
