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. Attach the wire nut to the red wire.
There should
be no connection to the red wire for 120 VAC operation.
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. Attach the wire nut to the white wire.
There should
be no connection to the white wire for 240 VAC operation.
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.)
120V ATMOSPHERIC HEATER
SUPPLY
SIDE
RETURN
or
NEUTRAL
HEATER
4 WIRES
GROUND
L1
RED
BLACK
HOT
BLACK
GREEN
GREEN
WHITE
WHITE
240V ATMOSPHERIC HEATER
HEATER
4 WIRES
L1
L2
RED
RED
BLACK
HOT
HOT
BLACK
GREEN
GREEN
WHITE
SUPPLY
SIDE
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. See pages 30-32.
If using a switched GFCI power source, the heater could display false
service indicators on the display panel if the pump is turned off.
NOTE:
If the transformer’s primary side is wired for 120 VAC and 240 VAC is applied, damage to the trans-
former and PC board may result. Such damages are not covered under manufacturer’s limited warranty.
WARNING:
DO NOT attempt to operate the heater at 208 VAC.
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