Installation Guide

whl-647 Rev. 000 Rel. 000 Date 8.11.17
10
When lling the water heater, open a hot water tap to release air
in the tank and piping. The tank must be full of water before the
heater is turned on. Failure to ensure the water heater is full before
turning it on could result in damage to the water heater and other
property damages. Such damages ARE NOT covered by water
heater warranty.
PIPING NOTES:
The following notes are applicable to all of the piping applications
demonstrated on this page.
1. Minimum pipe size should match connection size. Upsize pipe
accordingly if greater ow is required.
2. A thermal expansion tank suitable for potable water must be
sized and installed within this piping system between the backow
preventer and the cold water inlet.
3. All circulators should have an integral ow check.
4. Drains and check valve between unit and storage tank will assist
in purging air from system.
5. These drawings are meant to demonstrate system piping only.
The installer is responsible for all equipment and detailing required
by local codes. In Massachusetts, you must install a vacuum relief
valve per 248 CMR.
6. Mixing valve application is optional, but recommended to help
prevent scalding. See Part 3 for more information.
Figure 4 - Piping Detail - NOTE: Drawing is meant to demonstrate system
piping concept. Heat traps are optional.
H. Applications
Part 4 - Wiring
This unit is equipped with a terminal block for easy connection to el wiring and conversion. These heaters are equipped and wired for the
maximum possible input allowable (see Table 3 for listing of inputs and amperage requirements). The voltage requirement and dedicated
wattage load for the heater is specied on the rating label of the water heater. Consult your local power company to determine if your
electrical service is adequate for the additional load of the heater.
Refer to the wiring diagrams for eld connections. All wiring must conform to local code and the National Electric Code, and should be done
by a qualied licensed electrician or the local electric utility. Grounding can be accomplished by using approved conduit and ttings or other
approved conductive material. A grounding wire is provided on the junction bracket. This grounding wire must be used in the installation.
CAUTION
Tank must be full of water before the power is turned on. Heating elements will be damaged if energized for even a short time while tank is
dry. Failures due to “dry-ring” ARE NOT covered by warranty.
Be sure to ground the water heater. The preferred way to ground is with rigid metal conduit between the main panel and the water heater
junction box with approved end ttings (check codes on the use of exible conduit). If making a separate ground, a green ground wire
is provided in the water heater junction box. Replace the junction box cover and insulation after you have made the wiring connections.
Failure to follow these instructions could result in property damage, severe personal injury, or death.
Alternate Wiring / Operation Congurations
The water heater ships ready for Single Phase, Simultaneous operation. Figure 9 details this conguration. This factory installed wiring and
operation conguration may be converted to meet custom installation conditions. Figure 10 details these optional congurations. These
optional congurations include: 3 Phase Simultaneous, 3 Phase Non-Simultaneous, and Single Phase Non-Simultaneous. Conversions MUST
BE PERFORMED by a Qualied Service Technician.
STEP #1 – Wiring the Water Heater
a. To convert the water heater from Single Phase to 3 Phase:
1. Remove the red and grey wires from terminals L1 and L2 respectively. See Figure 5.
2. Place the red and grey wires in terminal L3.
3. Tighten screws to securely hold wires. Be sure not to place wire insulation under screws.
• Allow sucient time for the heater to completely ll with water.
• Verify elements are installed correctly. Check for leaks at the water heater and throughout the system.