Atmor ThermoPro Series User Manual

www.atmorusa.com
Electric Tankless Water Heaters
ThermoPro Series
Models:
AT-910-18TP, AT-910-24TP, AT-910-27TP,
Hot Water on Demand

Atmor ThermoPro Series Specifications

General

Power Source	Electric
Activation Flow	0.4 GPM
Type	Tankless
Voltage	220-240V
Weight	Varies by model
Material	Plastic
Safety Features	Overheat protection, dry-heating protection

Summary

Important Safety Guidelines and Contact Information

Safety Alert Symbols and Words

Explains safety alert symbols and words used in the manual for hazard communication.

General Usage and Safety Warning

Emphasizes reading the manual before use to avoid injury, death, and warranty voidance.

Contact Service Information

Provides contact details for service inquiries regarding the water heater unit.

California Proposition 65 Warning

Alerts about cancer and reproductive harm as per California regulations, with a website link.

Safety Guidelines and Product Overview

Severe Injury or Death Warning

Warns that violating safety guidelines can lead to severe injury or death.

Intended Use and Immersion Prohibition

Specifies the product is for indoor household use only and prohibits immersion in water.

Electrical Grounding Requirement

Mandates grounding of each breaker powering the unit via the electrical panel.

Installation Location Restrictions

Advises against installing the heater in locations exposed to direct sunlight, rain, moisture, or freezing temperatures.

Heating Water Only Limitation

States the unit is exclusively for heating water, not other liquids.

Temperature Setting Safety Advice

Advises considering safety and energy conservation when setting water temperature to prevent burns.

Installation Location Selection

Vulnerable User Temperature Recommendation

Recommends a lower temperature setting (120°F/49°C) for households with children, disabled, or elderly persons.

Indoor Installation Requirement

Specifies that the water heater is designed exclusively for indoor installation.

Freezing Temperature Installation Prohibition

Warns against installing in freezing temperature locations due to potential irreversible damage.

Accessible Location Recommendation

Advises placing the water heater in an easily accessible location.

Child Safety and Tampering Prevention

Recommends keeping the heater and connections out of children's reach to prevent tampering.

Environmental Restrictions for Installation

Prohibits installation in areas with excessive humidity, moisture, dust, or potential splashing.

Plumbing and AC Line Clearance

Advises against installing the unit below water pipes or AC lines to prevent damage from leaks.

Electrical Box Clearance

States that the unit should not be installed above electrical boxes or junctions.

Leakage Damage Prevention

Suggests avoiding locations prone to leakage damage and recommends drip pans or leak detectors.

Flammability Hazard Warning

Warns about flammability hazards and the need to keep materials away from the heater.

Mounting the Water Heater

Secure Mounting Surface Requirement

Details the requirement for securing the heater to a solid surface with four screws.

Leveling Before Fastening

Emphasizes ensuring the unit is level before final screw fastening.

Upright Installation Orientation

Specifies the unit must be installed upright with inlet/outlet at the bottom.

Electrical Box Mounting Prohibition

Prohibits installing the unit above electrical boxes or junctions.

Flammable Material Clearance for Mounting

Instructs to prevent contact with flammable materials by keeping them at least two feet away.

Upper Floor/Attic Installation Codes

Advises compliance with local codes for installations on upper floors or attics.

Initial Unit Cover Removal

Details the first step of removing the unit cover by unscrewing four screws.

PCB Cable Disconnection

Describes disconnecting cables from the PCB as part of the installation process.

Mounting Screw Specification

Explains using four screws of at least 1 inch to mount the unit onto the wall.

Horizontal Leveling and Inlet/Outlet Positioning

Ensures the unit is horizontally leveled with specific inlet/outlet positioning.

Prohibition of Upside Down or Sideways Installation

Explicitly prohibits installing the unit upside down or on its side.

Plumbing Requirements and Precautions

Adherence to Plumbing Codes

Stresses careful adherence to plumbing instructions and all applicable codes for installation.

Installation Sequence: Plumbing Before Electrical

Mandates that the plumbing installation must precede the electrical installation.

Soldering Prohibition for Sensor Protection

Warns against soldering pipes while connected to the unit to prevent sensor damage and warranty voidance.

Temperature Pressure Relief Valve (T&P) Information

Clarifies that T&P valves are generally not required for tankless heaters due to the absence of a storage tank.

T&P Valve Safety Recommendation

Recommends a T&P valve for enhanced safety with specific piping types.

State-Specific Pressure Relief Valve Requirements

Notes specific state requirements for pressure relief valves.

Piping Pressure Withstanding Capacity

Specifies that plumbing must withstand pressures up to 8 bar.

Maximum Operating Water Pressure

States the unit's maximum operating water pressure is 10 bar (150 psi).

Minimum Water Flow Rate Requirement

Requires a minimum water supply flow rate of 0.5 gpm for proper operation.

Flexible Water Hose Recommendation

Suggests using flexible water hoses for connecting the water heater.

Water Inlet Connection Technique

Provides instructions on proper connection techniques for water inlet pipes to prevent damage.

Plumbing Installation Steps

Manual Shut-off Valve Recommendation

Recommends installing shut-off valves for easier maintenance and servicing.

Line Flushing Before Pipe Connection

Advises flushing lines before connecting pipes to remove debris from welding or soldering.

High-Temperature Pipe Rating

Recommends using high-temperature rated pipes within 3 feet of connections.

Air Purge Before Electrical Installation

Instructs to run water through the unit to purge air before electrical installation.

Step 1: Flush Cold Water Supply Line

Details the first step of flushing the cold water supply line of all debris.

Step 2: Connect Hot and Cold Water Lines

Explains connecting hot water outlet and cold water inlet lines to the correct sides of the unit.

Booster Functionality with Pre-heated Water

Notes the possibility of connecting pre-heated water to the cold water inlet for booster functionality.

Step 3: Run Water to Purge Air

Instructs to run water through the unit for 2-3 minutes after fitting to purge air.

Heating Element Damage Warning

Warns of permanent damage to heating elements if step 3 is not performed.

Step 4: Inspect for Leaks

Describes inspecting all connections for leaks after completing plumbing installation.

Leak Detection and Service Contact

Advises turning off water supply and contacting service if a leak is detected.

Electrical Requirements and Precautions

Compliance with Electrical Codes

Mandates installation in compliance with all national, state, provincial, and local electrical codes.

Electrical Work Safety: Power Off Warning

Emphasizes shutting off power at the breaker before any electrical work to prevent injury or death.

Wiring and Circuit Protection Standards

Requires all wiring and circuit protection to comply with NEC or CEC standards.

Canadian Electrical Code Wire Sizing

Details the Canadian Electrical Code requirement for sizing wires and circuit protection at 125% of heater's current rating.

Sufficient Home Electrical Power Check

Advises ensuring sufficient home electrical power for the heater's maximum amperage load.

Wire and Grounding Requirements for High kW Models

Notes that 18kW, 24kW, and 27kW heaters require three sets of wire and ground.

Electrical Installation Steps

Step 1: Breaker and Wire Connection

Details connecting wire pairs to the breaker, specifying black and red wires.

Step 2: Power Cable Routing and Connection

Instructs on running power cables from the breaker to the heater using appropriate wire gauge.

Ground Conductor Requirement per Circuit

States that each incoming circuit must have a separate ground conductor.

Step 4: Double Check Electrical Connections

Emphasizes double-checking electrical connections for correctness, tightness, and security.

Step 5: Purge Air Before Power On

Requires purging water lines of air before powering on the unit, referencing the plumbing section.

Importance of Correct Wiring for Operation

Highlights the importance of correct wiring for proper unit operation and warns against mixing wire sets.

Flow Rate Information and Operation Guide

Temperature Rise vs. Flow Rate Chart

Refers to a chart showing maximum temperature rise for a given flow rate.

Introduction to Tankless Water Heater Operation

Introduces operation by comparing it to traditional water heating systems.

On-Demand Heating Mechanism

Explains the unit's design for on-demand hot water heating using internal elements.

Instantaneous Hot Water Delivery

Highlights the instantaneous hot water delivery feature of tankless systems.

Demand Detection and Heating Activation

Describes how demand is detected via a flow sensor, activating heating elements.

Maximum Flow Rate Limitation

Warns about the maximum flow rate limitation of tankless water heaters.

Temperature Mixing Comparison

Compares tankless heating to conventional systems regarding temperature and mixing cold water.

Seasonal Incoming Water Temperature Impact

Explains how incoming water temperature variations affect hot water supply based on seasons.

Water Quality and Maintenance Procedures

Importance of Water Quality for Heater Performance

Stresses the importance of water quality for installation and maintenance of the water heater.

Hard Water Scale Prevention

Advises water treatment and regular flushing for hard water areas to prevent scale build-up and damage.

Maintenance Overview for Performance and Leak Reduction

Introduces recommended maintenance for optimal performance and leak reduction.

Periodic Inspection for Damage or Failure

States minimal maintenance is required, involving periodic inspection for damage or failure.

Scale Buildup and Temperature Relation

Explains that higher temperatures accelerate scale buildup compared to lower temperatures.

Water Inlet Filter Cleaning Schedule

Instructs to clean the water inlet filter every six months to remove debris.

Post-Maintenance Air Purge Requirement

Emphasizes powering off and purging air before powering up after maintenance to prevent element damage.

Warranty Voidance Due to Improper Maintenance

Warns of permanent heating element damage and warranty voidance if air is not purged after maintenance.

User Interface, Controls, and Resuming Operation

Procedure for Resuming Operation After Air Introduction

Details steps to safely resume operation after air is introduced into the plumbing system.

Step 1: Shut Off Unit Power

Step 1: Shut off power to the unit at the main electrical panel breaker.

Step 2: Perform Maintenance Tasks

Step 2: Perform the necessary maintenance or servicing tasks.

Step 3: Purge Air from Lines and Heater

Step 3: Run water through the unit to purge air from lines and heater.

Critical Warning: Permanent Element Damage

Crucial warning that this step prevents permanent damage to heating elements.

Step 4: Reconnect Unit Power

Step 4: Reconnect power to the unit at the main electrical panel breaker.

Step 5: Check and Adjust Temperature

Step 5: Check and adjust temperature while water is running.

Recommended Temperature Setting

States the recommended temperature setting for the unit is 118°F (48°C).

Power Control Operation

Describes the power controls for activating and deactivating the heater.

Setting the Output Water Temperature

Explains how to set and adjust the desired output water temperature.

Adjustable Temperature Range

Specifies the adjustable temperature range for the output water.

Comfortable Bathing/Showering Temperature

Suggests a comfortable temperature range for bathing and showering.

Optimal Setting for Household Needs

Recommends 118°F (48°C) for all household needs at maximum flow rate.

High Temperature Setting Caution

Warns that higher temperature settings can cause scalding injuries, especially to vulnerable individuals.

System Start-up and Freezing Protection

First-Time System Start-up

Details turning the knob clockwise with water running to activate the heater for the first time.

Adjust Temperature to Recommended Setting

Explains adjusting the temperature knob and reiterates the recommended setting.

Preventing Damage from Freezing Conditions

Advises protecting the heater from damage if ambient temperatures drop below 32°F (0°C).

Warranty Voidance Due to Freezing

Warns that freezing water inside the heater can cause non-warrantied damage.

Component Identification: Temperature Knob

Identifies component 'A' as the temperature setting knob.

Component Identification: Temperature Display

Identifies component 'B' as the digital temperature display.

Component Identification: Hot Water Outlet

Identifies component 'C' as the hot water outlet connection.

Component Identification: Cold Water Inlet

Identifies component 'D' as the cold water inlet connection.

Troubleshooting Common Issues

Pre-Service Troubleshooting Check

Advises checking the troubleshooting list before contacting service for common issues.

Contacting Authorized Distributor for Unresolved Issues

Recommends contacting a local distributor if problems cannot be resolved.

Issue: No Hot Water, Display Off

Lists the issue of no hot water and the display not lighting up.

Issue: No Hot Water, Display On

Lists the issue of no hot water when the display is lit.

Issue: Water Heated But Not Hot Enough

Describes the problem of water being heated but not hot enough.

Cause: Temperature Setting Too Low

Identifies low temperature setting as a cause for insufficient heating.

Cause: Low Water Pressure

Notes low water pressure (below 0.5 bar) as a potential issue.

Cause: Excessive Cold Water Mixing

Points to mixing excessive cold water as a reason for insufficient hot water.

Cause: Thermal Loss in Piping

Identifies thermal loss in long pipe runs as a cause for less hot water.

Troubleshooting Continued and Specific Issues

Issue: Water Heated But Not Hot Enough (Voltage Issue)

States that voltage below 240V can affect heating power and display readings.

Issue: Water Too Hot

Lists the issue of water being too hot.

Cause: Slow Water Flow Rate

Identifies slow water flow rate through the heater as a cause for excessive heat.

Cause: Temperature Setting Too High

Points to a high temperature setting as a reason for water being too hot.

Issue: Heater Shuts Off During Use

Describes the problem of the heater shutting off during operation.

Cause: Power Outage or Faulty Wiring

Suggests power outage or faulty wiring as causes for the heater shutting off.

Issue: Water Stops Flowing

Lists the issue of water stopping flow.

Cause: Blockage in Water Pipes/Hoses

Identifies blockages in water pipes or hoses as a cause for flow stoppage.

Issue: Variable Water Temperature During Use

Describes the issue of water temperature fluctuating between hot and cold.

Cause: Minimum Water Pressure Drop

Notes that water pressure dropping below minimum can cause temperature variations.

Reset Unit Procedure

Pre-Reset Power Shut-off Warning

Emphasizes shutting off power before attempting to reset the unit.

Serious Injury or Death Reset Warning

Warns of severe injury or death if the reset procedure is ignored.

Locate and Press Reset Buttons

Instructs to locate and press the three reset buttons.

Contact Service for Frequent Resets

Advises contacting customer service if frequent resets are needed.

Limited Warranty Information

Service and Repair Contact Instructions

Provides instructions for obtaining service or repair for the water heater.

Return Policy Without Authorization

Details the policy against returning, mailing, or bringing the product to service centers without authorization.

Warranty Non-Transferability

States the warranty is non-transferable and applies only to the original owner.

Warranty Coverage Period

Outlines the two-year warranty for defects and seven-year warranty for leakage from the purchase date.

Exclusions: Labor and Consequential Expenses

Clarifies the manufacturer's exclusion of labor charges and consequential expenses.

Conditions for Warranty Voidance

Lists conditions under which the warranty becomes void, such as improper installation or servicing.