19
SINGLE PHASE WIRING
WARNING: Poor wiring connections, incorrect wire size/type, or wires with too much tension may
result in loss of conductivity or overheating. Take special care that wire jacket is securely connected with
proper means of strain relief before connecting ground and phase wires. Confirm wire connection tabs
are securely closed, tight, and secure before installing junction box cover or turning on power.
WARNING: Be especially careful about the existing wiring on a retrofit. If it is not appropriate for this
application, be sure to upgrade it accordingly. We recommend “SOOW” or “SJOOW” type cords
which are readily available. The key features are stranded wires (which make better contact than solid-
core wires), a voltage rating of 300V or more, and relative flexibility which does not produce any undue
strain on the connectors.
BRANCH CIRCUIT SIZING AND WIRE SIZE GUIDE (use copper conductors only)
Water Heater Wattage Power Supply Voltage
Recommended Over
Current Protection*
Copper Wire Size
recommended**
4500 W 240 V 25 A 10 AWG
*Fuse or circuit breaker amperage rating
**Branch circuit sizing and wire size based on National Electric Code (N.E.C. Table 310-16 at 167°F)
ELECTRICAL TERMINAL BOX CONNECTION
WARNING: Your wires need to be stripped of ½”, make sure the wire is
fully inserted into the connector.
To avoid any electrical problem, make sure the position of the shunts corresponds to your connection as
shown below. Please remove the unnecessary shunts from the connection box.
A. Typical connection
Standard 2-phase grounded connection.
Ph 1 - 208VAC/240VAC - 19A.
Phase 1 to both heating elements (T02) and
electronic control (T01).
Ph 2 - 208VAC/240VAC - 19A.
Phase 2 to heating elements (T04 and T05) and
electronic control (T03).
Ground connection (T06 and T07).
½''
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