Watts CEN2000 User manual

•

TAG-0104_A • 4/18/2023

Disclaimer

The information contained in this manual is subject to change without notice

from PVI Industries, LLC. PVI makes no warranty of any kind with respect to this

material, including, but not limited to, implied warranties of merchantability and

fitness for a particular application. PVI is not liable for errors appearing in this

manual, not for incidental or consequential damages occurring in connection

with the furnishing, performance, or use of these materials.

Centurion Pre-Installation Electrical Power Guide

TAG-0104_A •4/18/2023 • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 2 of 6

1. GENERAL

Centurion natural gas fueled modulating and condensing water heaters are fully factory wired

packaged units which require simple external power wiring as part of the installation (Figure 2-

1). This technical guide is intended to help designers provide electrical power wiring (line

voltage) to Centurion units. Control wiring details are provided in other publications, depending

upon unit application. This document is intended only as a guide and therefore cannot include

all possible alternatives or unit applications. To comply with all codes and authorities having

jurisdiction, designers and installers must plan the electrical wiring carefully and execute the

installation completely. Emergency shutoffs, fusible fire switches, break glass stations, and

other electrical requirements should be considered and installed whenever necessary.

2. HEATER ELECTRICAL REQUIREMENTS

Centurion water heaters are available with the following power options:

Model

Voltage

Phase

MOCP

Amperage

CEN2000

208 V

3/ 60 Hz

460 V

3/ 60 Hz

Voltages lower than those specified in the table above will result in increased wear and

premature failure of the blower motor. Wire size and type should be made per the National

Electrical Code based on length and load.

The power box for field wiring connections is located in the upper right corner behind the unit

front panel. All copper wire must be connected to the power box.

Centurion Pre-Installation Electrical Power Guide

TAG-0104_A •4/18/2023 • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 3 of 6

Figure 2-1: Service Disconnect Switch Typical Location

Figure 2-2: Electrical Power Panel Internal Components

Service Disconnect

Switch

24 VDC POWER

SUPPLY

12V POWER

SUPPLY

TRANSFORMER

POWER

BREAKER

FUSE BLOCKS

TERMINAL

BLOCKS

Centurion Pre-Installation Electrical Power Guide

TAG-0104_A •4/18/2023 • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 4 of 6

3. PROVISIONS FOR SERVICE

Designers must provide emergency shutoffs and other devices to satisfy electrical codes. It is

also recommended to provide an electrical shutoff disconnect switch of suitable load carrying

characteristics on or near each Centurion water heater.

•No electrical boxes or field components should be mounted to the surface of the unit or

where they might interfere with the removal of the side or top panels for maintenance.

•The service disconnect switch should be mounted near the unit (Figure 2-1).

•Wiring conduit, EMT, or other wiring paths should be supported externally, not secured

to the unit.

•Electricians should be instructed as to where the wiring conduit should be located, such

as away from the relief valve discharge, drains, etc.

•All electrical conduit and hardware should be installed so that it does not interfere with

the removal of any covers, inhibit service or maintenance, or prevent access between

the unit and walls or another unit.

4. WATER HEATER WIRING

A dedicated protected circuit should be provided from the power source to the water heater. No

other electrical devices should be permanently wired on the same circuit. The protected circuit

and circuit breaker switch must be sized for the amperage values below.

An emergency switch (electrical shutoff) must be wired in series with power to the unit.

Connecting an emergency shutoff switch (E-stop) to the main power terminals of the water

heater is the recommended and safest way to totally disable and un-power the unit. Use of the

remote interlock, located on the I/O board, is not recommended since it does not cutoff power

within the unit, it only disables it. Under no circumstance should the remote interlock of the

WHM Manager unit be used as an emergency switch for the plant.

Figure 4-1 –Water Heater Wiring Diagram

The following table lists the input power requirements for all Centurion water heaters, including

the diagram number of each model’s corresponding schematic diagram:

Diag.

Voltage/Phase/Frequency

MOCP

Wires

208V / 3/ 60 Hz

20 A

460V / 3/ 60 Hz

15 A

Centurion Pre-Installation Electrical Power Guide

TAG-0104_A •4/18/2023 • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 5 of 6

For applicable wiring connections, refer to the schematic diagrams below.

Figure 4-2 –CEN2000: 208 V / 3/ 60 Hz - 5 Wire

Figure 4-3 - CEN2000: 460 V / 3



/ 60 Hz - 4 Wire –DOMESTIC

5. MULTIPLE UNIT WIRING

Whenever multiple units are installed within the same mechanical spaces, electrical code

requirements call for a single electrical shutoff for emergency use. It is the responsibility of the

electrical designer to comply with local codes and regulations affecting an individual installation.

208 V / 3/ 60 Hz

460 V / 3/ 60 Hz

Centurion Pre-Installation Electrical Power Guide

TAG-0104_A •4/18/2023 • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 6 of 6

Change Log

Date

Description

Changed by

4/18/23

Initial Release

DW Barron

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