To Next PageTo Next PageHow to fix an ETL Heater when the fan is inoperative?
If the fan in your ETL Heater isn't working, start by checking the amperage, fuse, and circuit breaker. Replace the fuse if necessary. Also, ensure the disconnect switch is in the “ON” position. Inspect the motor wiring, comparing it to the wiring diagram on the fan motor. If the fan belt is broken, replace it. Finally, check and reset the motor starter if it's overloaded.
Why ETL Heater is not producing enough heat?
If your ETL Heater isn't producing enough heat, first, make sure the main gas pressure isn't too low, increase it, but do not exceed 14 inches wc inlet pressure (5 PSI on size 4-5 heater). If possible, decrease the airflow. Check the design conditions of the burner, and inspect the wiring of the gas controls. Also, ensure the heat setpoint isn't too low; increase it if needed. Replace the HMI if it’s faulty and check/replace the discharge sensor. Finally, check the wiring if the unit is locked into low fire.
What to do if ETL Heater motor is overloaded?
If your ETL Heater is experiencing a motor overload, check that the fan is rotating in the correct direction as indicated on the rotation label. Reduce the fan RPM if the fan speed is too high or if the duct static pressure is lower than designed. Inspect the motor wiring, comparing it to the wiring diagram on the fan motor. Ensure the overload in the starter is set to the motor’s FLA value and determine if the motor HP is sufficient for the job.
Why is my ETL Heater producing too much heat?
If your ETL Heater is producing too much heat, you should check or replace the modulating valve if it’s defective. Ensure that the heat setpoint isn't too high, and decrease it if necessary. Check the wiring if the unit is locked into high fire. Replace the HMI if it’s faulty and check/replace the discharge sensor.
How to increase airflow in my ETL Heater?
To address insufficient airflow in your ETL Heater, verify that the fan is rotating in the direction shown on the rotation label. Check the duct and connections for poor outlet conditions, ensuring a straight duct connection to the outlet. Inspect the damper linkage and replace the damper motor if damaged. Check the ductwork and adjust/resize it to reduce duct losses if the duct static pressure is higher than designed. Increase fan RPM if the blower speed is too low, but avoid overloading the motor. Open or adjust any closed supply grills or registers. Clean or replace dirty/clogged filters and adjust the belt tension if there's belt slippage.
How do I stop excessive vibration and noise in my ETL Heater?
To resolve excessive vibration and noise in your ETL Heater: * Replace the wheel if it's damaged or unbalanced. * Align misaligned pulleys. * Refer to the performance curve for the fan if it's operating in an unstable region. * Lubricate bearings or replace them if damaged. * Reduce fan RPM if the fan speed is too high. * Clean dirty or oily belts and adjust or replace loose belts. Replace worn belts.
Why won't the pilot light stay lit on my ETL Heater?
To troubleshoot why the pilot light won't light or stay lit on your ETL Heater, first, ensure the main gas is on by opening the main gas valve. Purge the gas line to remove any air. Clean the pilot orifice with compressed air if it's dirty. Adjust the gas pressure if it's out of range. Turn on the pilot valve if it's off and tighten the pilot orifice if there's a leak. Redirect any excessive drafts away from the unit. Check the limits and airflow sensor if a safety device has cut power. Clean the flame sensor if it's dirty and replace the flame rod if it's defective. Adjust the heat setpoint if there's no call for heat. Finally, check the wiring, sensor, and ignition controller if there's no spark at the igniter and check the spark gap.
What to do if main burner does not light on ETL Heater?
To address a main burner that won't light on your ETL Heater (when the pilot is lit), replace the combination valve if it's defective. Check the wiring to the valve if it's loose. Open the shut-off valve if it's closed. Replace the flame safety controller if it's defective. If the pilot fails as the main gas valve opens and gas flows, plug the first burner port next to the pilot gas tube with burner cement.
How to reduce excessive airflow in ETL Heater?
To fix excessive airflow in your ETL Heater, reduce the fan RPM if the blower speed is too high or if the duct static pressure is lower than designed. Install filters if they are missing.
Describes ETL listing standards for gas unit heaters and safety control boards.
Lists relevant patents for the technology, specifically for make-up air systems.
Covers mechanical considerations and warnings for unit handling and lifting.
Specifies minimum clearances from combustible materials and service areas.
Details requirements for preparing the installation site and unit placement.
Details for mounting the unit on a roof, including curb requirements.
Specific instructions for units installed with an exhaust fan system.
Guidance for installing the unit directly into ductwork systems.
Instructions for installing the unit within an indoor space or duct run.
Installation details for recirculation units, roof and inline.
Details on connecting the unit's wiring to the building's power supply.
Identifies and describes connectors on the Make-up Air (MUA) control board.
Guidance on installing Human-Machine Interface (HMI) and remote sensors.
Explains how the unit controls temperature based on various inputs.
Details on controlling fan speed using ECM motors and external PWM signals.
How to navigate and access the HMI menu for configuration.
Details on configuring HMI settings like communication and advanced options.
How to set and manage operational schedules using the HMI.
Configuration options for unit features like dampers, heaters, and mixing box.
Navigating user settings for temperature, intake, discharge, and option setpoints.
Accessing and configuring job-specific unit parameters with a password.
Accessing diagnostic and testing functions with a certified technician password.
Setting various heating configurations, including type, stages, gas, and limits.
Setting cooling types, condenser staging, and minimum times for cooling operation.
Detailed configuration options for blower control, modes, presets, and interlocks.
Settings for pressure control, purge cycles, dry mode, and mixing box behavior.
Settings for damper presets, intake/discharge adjustment, and CO2 control parameters.
Configuring outdoor reset, dynamic set points, override durations, and sensor offsets.
Monitoring various unit parameters like temperatures, humidity, VFD status, and limits.
Accessing diagnostic tests for components and running specific operational tests.
Procedures for clearing faults, setting clock, factory reset, and calibrating sensors.
Navigating user settings for temperature, intake, discharge, and option setpoints.
List of DDC control points, their types, functions, and descriptions.
Important notes regarding DDC control, settings, and scheduling.
Comprehensive list of DDC fault codes and their descriptions.
List of fault codes specific to the Variable Frequency Drive (VFD).
Identifies causes and corrective actions for airflow-related problems.
Troubleshooting common issues with pilot and main burner ignition and operation.
Lists HMI fault codes, potential causes, and corrective actions.
Procedure for resetting the unit's flame safety control or other faults.
Routine maintenance procedures for ensuring unit cleanliness and proper operation.
Annual maintenance procedures for the burner assembly, including cleaning.
Information on filter quantities and replacement for various unit configurations.
Steps for safely shutting down the unit in an emergency situation.
Procedures for safely shutting down the unit for extended periods and restarting it.
General