Hubbell EMV User Manual

OPERATING AND MAINTENANCE MANUAL
FOR PACKAGED ELECTRIC TEPID
WATER HEATING SYSTEM
ELECTRIC HEATER COMPANY
BASE MODEL “ EMV ”

Hubbell EMV Specifications

General

Category	Water Heater
Brand	Hubbell
Model	EMV
Element Type	Screw-in
Terminal Type	Screw
Thread Size	1 inch NPT

Summary

General Description and Construction

General Description of Tepid Water Heater

Describes the packaged electric water heater system for tepid water delivery, including its components.

Construction Details of Water Heater

Details tank construction, connections, heating elements, thermostat, and high limit switch.

Mixing Valve and System Components

Details mixing valve, air vent, pressure gauge, and insulation.

Optional Features for Water Heater

Lists optional features like alarms, weather package, and explosion proof construction.

Installation and Start-Up Procedures

Water Heater Placement Guidelines

Provides guidelines for selecting a clean, dry location, protecting from freezing, and ensuring clearance.

Piping Installation Instructions

Details connecting water inlet/outlet, relief valve, overflow pipe, and expansion tank.

Heater Filling Procedure

Steps to fill the heater, including opening outlets and air vent, and closing drain valve.

Electrical Installation Steps

Instructions for entering junction box and connecting feeder leads with wire nuts.

Final Installation Checks

Check connections, ensure steps are complete, and monitor temperature after first heating.

Recirculation Package Description

Details how a recirculation loop provides tepid water at fixtures for distant applications.

Scheduled Maintenance and Operation

Freezing Prevention Measures

Instructions to drain the tank if electricity is off or freezing is a risk.

Monthly Mixing Valve Inspection

Monthly checks of the mixing valve, including temperature monitoring and flow rate testing.

Quarterly Inspection Procedures

Quarterly checks for thermostat, relief valve, element flange leaks, and electrical connections.

Annual Tank Flushing Procedure

Annual procedure to flush the tank, involving draining and refilling with power on/off.

Troubleshooting Common Issues

No Hot Water Troubleshooting

Troubleshooting steps for when there is no hot water in the tank.

Low Water Temperature Troubleshooting

Troubleshooting steps for when water temperature is below settings.

Relief Valve Discharge Troubleshooting

Troubleshooting steps for a continuously discharging relief valve.

Tepid Water Too Hot Troubleshooting

Troubleshooting steps for when tepid water is too hot.

Tepid Water Too Cold Troubleshooting

Troubleshooting steps for when tepid water is too cold.

Servicing and Replacement of Parts

Surface High Limit Cut-Off Replacement

Steps to replace the surface-mounted high limit cut-off switch.

Immersion High Limit Cut-Off Replacement

Steps to replace the immersion high limit cut-off switch.

Single Phase Heating Element Replacement

Procedure to replace a single-phase heating element.

Three Phase Heating Element Replacement

Procedure to replace a three-phase heating element.

Element Jumper Configuration Guide

Diagrams for 1-phase and 3-phase element jumper configurations at various voltages.

Immersion Thermostat Replacement

Steps to replace the immersion thermostat.

Magnetic Contactor Replacement (3-Phase)

Procedure to replace the magnetic contactor for 3-phase units.

Relief Valve Replacement Procedure

Steps to replace the relief valve assembly.

Mixing Valve Replacement

Procedure to replace the mixing valve.

Mixing Valve Recalibration Steps

Steps to recalibrate the mixing valve for correct temperature output.

Element Specifications Charts

Single Phase Element Chart

Chart listing single-phase element part numbers, power, length, and resistance.

Three Phase Element Chart

Chart listing three-phase element part numbers, length, and resistance.