Hubbell PBX Series User Manual

Hubbell PBX Series

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INSTALLATION, OPERATION, AND

MAINTENANCE MANUAL FOR

HYBRID ELECTRIC HEAT PUMP

WATER HEATER

ELECTRIC HEATER COMPANY

BASE MODEL “ PBX ”

2015

Table of Contents

Questions and Answers:

M
Miss Jennifer BartonAug 2, 2025
Why is there no hot water from my Hubbell Heat Pump?
- J
  Jason JonesAug 2, 2025
  Several factors can cause a lack of hot water. It could be due to a tripped circuit breaker (reset it), a tripped high limit switch (reset it), or loose wires (tighten them). If you're not in 'Econ' mode, the heating elements might be inoperable and need checking. Low line voltage could also be the culprit, requiring an electrician's check. A faulty controller or temperature sensor might also be the cause; check the wire connections, and if the controller display isn't lit with available power, or if the temperature doesn't match the actual water temperature (within ±5°F), consider replacing the controller and/or sensors. It could also be due to a heat pump error (refer to the heat pump error codes) or an incorrectly low setpoint (increase it).
V
Vanessa RobertsAug 16, 2025
Why does the relief valve on my Hubbell PBX Heat Pump discharge continuously?
- K
  Kyle BlakeAug 16, 2025
  Continuous discharge from the relief valve indicates excessive temperature or pressure in the tank. These valves are designed to activate if the water temperature exceeds 210°F or the tank pressure exceeds the valve's rating. If the issue is excessive temperature, the controller isn't shutting off at the setpoint and needs replacement. If it's a pressure issue, thermal expansion is likely the cause. Consider installing a thermal expansion tank.

Hubbell PBX Series Specifications

General

Brand	Hubbell
Model	PBX Series
Category	Heat Pump
Language	English

Summary

Safety Information and Precautions

DANGER and WARNING Statements

Critical safety warnings regarding water temperature and potential burns.

OPERATING PRINCIPLE, SPECIFICATIONS, AND PERFORMANCE

How the Hubbell Heat Pump Water Heater Works

Explains the working principle of the heat pump water heater.

Heat Pump Functions with Diagram

Detailed breakdown of heat pump functions with a visual diagram.

Specifications and Performance Metrics

Unit Specifications

Detailed technical specifications of the unit.

Performance Charts

INSTALLATION GUIDELINES

Installation Warnings

Critical warnings before commencing installation.

Water Heater Placement

Piping Installation Instructions

CONTROLLER OPERATION AND MODES

Button Functions and Operating Modes

Advanced Controller Settings

Child Lock and Temperature Setpoint

SCHEDULED MAINTENANCE

Maintenance Warnings and Freezing

Safety precautions before maintenance and draining for freezing danger.

Filter Cleaning and Annual Inspection

Procedures for cleaning the filter and performing annual checks.

TROUBLESHOOTING AND ERROR CODES

Troubleshooting Common Issues

Common problems and their corrective actions.

Heat Pump Error Alerts

Explains specific error codes and maintenance alerts for the unit.

Heating Element Operation Check

SERVICING AND REPLACEMENT OF PARTS

Component Replacement Procedures

Step-by-step guides for replacing key components.

Replacing Hi-Limit, Element, Relief Valve

Related product manuals

Hubbell PBX120SL