21
6.2. Transformer Wiring
6.2.1. 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.
SUPPLY
SIDE
RETURN
or
NEUTRAL
HEATER
4 WIRES
GROUND
L1
RED
BLACK
HOT
BLACK
GREEN
GREEN
WHITE
WHITE
Figure 27. 120 VAC Wire Connection
6.2.2. 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.
A
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 28. 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.)
NOTE:
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.
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.
