Hubbell PBX120SL User Manual

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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:

S
Sarah FoxAug 6, 2025
Why is there no hot water from my Hubbell Heat Pump?
- B
  bparkAug 7, 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).
K
Kelly HansenAug 21, 2025
Why does the relief valve on my Hubbell Heat Pump discharge continuously?
- D
  David BrownAug 21, 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 PBX120SL Specifications

General

Brand	Hubbell
Model	PBX120SL
Category	Heat Pump
Language	English

Summary

Safety Information and Precautions

DANGER: Burn Hazards

Warns of severe burns from water over 125°F, risk to children/elderly.

Operating Principle, Specifications, and Performance

Performance

Energy Consumption Chart

Installation

Water Heater Placement

Guidelines for selecting a suitable location, clearances, and environmental considerations.

Piping Installation

Instructions for connecting water lines, installing T&P relief valve, and overflow piping.

Controller Operation

About the Controller

Powering up your Heat Pump Water Heater for the first time

Button Overlay

Describes the basic functionality of each button on the controller interface.

Operating Modes

Introduces the four operating modes and four temporary settings for the water heater.

Economy Mode

Details the 'Economy' mode, which uses only the heat pump for maximum efficiency.

Hybrid Mode

Explains the 'Hybrid' mode, balancing heat pump and electric elements for efficiency and demand.

Electric Mode

Describes the 'Electric' mode, which disables the heat pump and uses only electric heating elements.

Super Mode

Changing the Mode

Activating Vacation Override

Activating Max Heat Override

Activating Fan Overrides

Child Lock Feature

Temperature Setpoint Adjustment

Guides on how to change the desired water temperature and save the new setting.

Controller Options and Settings

Accessing Options Menu

Filter Setting

Fan Speed Setting

Temperature Differentials

Scheduled Maintenance

Cleaning the Hot Water Heat Pump Filter

Annual Inspection

Detailed steps for annual checks including temperature monitoring, relief valve test, flange inspection, and flushing.

Troubleshooting

No Hot Water Issues

Lists probable causes and corrective actions for the 'No hot water' symptom.

Water Temperature Below Settings

Addresses issues where water temperature is consistently below the setpoint.

Relief Valve Discharges Continuously

Explains causes and remedies for a continuously discharging relief valve.

Check Heating Element Operation

Flowchart and steps to diagnose heating element issues based on voltage and amp draw.

Heat Pump Water Heater Maintenance Alerts and Procedures

Explains unit error messages for filter, drain, pressure, and other issues.

Pump Water Temperature Sensor Error

Describes error 'Ph2o' related to the pump's water temperature sensor.

Defroster Temperature Sensor Error

Details error 'tdEF' indicating a problem with the defroster temperature sensor.

Controller Water Temperature Sensor Error

Explains error 'Ch2o' for the controller's water temperature sensor.

Communications Error

Covers error 'conn' indicating a communication issue between controllers.

Checksum Error

Addresses error 'CHS' which may be resolved by power cycling the unit.

Defrost Mode Indicator

Servicing & Replacement of Parts

WARNING / CAUTION

Safety warning to turn off power before any servicing or replacement.

Surface Temperature Hi-Limit Cutout Switch

Step-by-step instructions for replacing the high-limit cutout switch.

Heating Element Replacement

Detailed procedure for removing and replacing the heating element, including gasket.

Relief Valve Replacement

Instructions for disconnecting, removing, and replacing the relief valve.

Wiring Diagram

Heat Pump Compartment Wiring

Upper Compartment Wiring

Lower Compartment Wiring

Main Controller and Junction Box Wiring

Heat Pump Control Connections

Power and Component Connections

Sensor and Data Board Connections

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