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Greenheck ERV-20 - User Manual

Greenheck ERV-20
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Only qualified personnel should install this system.
Personnel should have a clear understanding of these
instructions and should be aware of general safety
precautions. Improper installation can result in electric
shock, possible injury due to coming in contact with
moving parts, as well as other potential hazards. Other
considerations may be required if high winds or seismic
activity are present. If more information is needed,
contact a licensed professional engineer before moving
forward.
1. Follow all local electrical and safety codes, as well
as the National Electrical Code (NEC), the National
Fire Protection Agency (NFPA), where applicable.
Follow the Canadian Electrical Code (CEC) in
Canada.
2. All moving parts must be free to rotate without
striking or rubbing any stationary objects.
3. Unit must be securely and adequately grounded.
4. Do not spin fan wheel faster than maximum
cataloged fan RPM. Adjustments to fan speed
significantly effects motor load. If the fan RPM is
changed, the motor current should be checked to
make sure it is not exceeding the motor nameplate
amps.
5. Do not allow the power cable to kink or come in
contact with oil, grease, hot surfaces or chemicals.
Replace cord immediately if damaged.
6. Verify that the power source is compatible with the
equipment.
7. Never open access doors to the unit while it is
running.
General Safety Information
DANGER
Always disconnect power before working on or near
this equipment. Lock and tag the disconnect switch or
breaker to prevent accidental power up.
CAUTION
When servicing the unit, the internal components may
be hot enough to cause pain or injury. Allow time for
cooling before servicing.
CAUTION
Precaution should be taken in explosive atmospheres.
®
Energy Recovery Ventilator 1
®
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. Read carefully before attempting to assemble, install,
operate or maintain the product described. Protect yourself and others by observing all safety information. Failure
to comply with these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.
Document 476412
Model ERV
Energy Recovery Ventilators
Energy Recovery Technical Support
Call 1-800-240-0870

Table of Contents

Questions and Answers

  • R
    rojaschristopherAug 22, 2025
    What to do if Greenheck Fan blower fails to operate?
    • S
      Sharon MayAug 22, 2025
      If the Greenheck Fan blower isn't working, there might be several reasons: * A fuse might be blown, or a circuit breaker open. In this case, replace the fuse or reset the circuit breaker, and then check the amps. * The motor or capacitor could be defective, requiring replacement. * The motor starter might be overloaded; try resetting it and checking the amps. * There might be an electrical issue, so check the on/off switches and the correct supply voltage. * Lastly, examine the drive for broken or loose belts and tighten any loose pulleys.
  • T
    Thomas MurrayAug 25, 2025
    Why Greenheck ERV-20 Fan motor over amps?
    • C
      Corey HensleyAug 26, 2025
      If your Greenheck Fan motor is over amping, it could be due to several reasons: * The CFM might be too high, so check it and adjust the drives if needed. * Static pressures may be higher or lower than designed; improve ductwork if higher or lower the fan RPM if lower. * Incorrect blower rotation; check and reverse if necessary. * Incorrect motor voltage; check the motor nameplate against the supplied voltage. * Insufficient motor horsepower; see the specifications and catalog for fan curves to determine if the horsepower is sufficient. * Shorted windings in the motor; replace the motor.
  • T
    thomasdavidAug 28, 2025
    What to do for low airflow (cfm) in Greenheck ERV-20?
    • J
      Jennifer HowellAug 28, 2025
      If your Greenheck Fan has low airflow (CFM), here's what you can check: * Make sure the unit damper is fully open. If not, adjust the damper linkage or replace the damper motor. * If the system static pressure is too high, improve the ductwork to eliminate losses. * If the blower speed is too low, check for correct drives and RPM using catalog data. * Ensure the fan wheels are operating in the correct direction. * Check for a dirty filter or energy wheel and follow the cleaning procedures. * Repair any leaks in the ductwork. * Correct or improve ductwork if elbows or other obstructions are blocking the fan outlet. * Adjust the belt tension if there's belt slippage.
  • M
    michael68Aug 30, 2025
    How to decrease high airflow (cfm) in Greenheck ERV-20 Fan?
    • R
      Rachel WhiteAug 30, 2025
      If your Greenheck Fan has high airflow (CFM), check the following: * Ensure the blower fan speed is not too high. Check for the correct fan RPM and decrease the fan speed if necessary. * Verify that all filters are in place. Install filters if they are missing. * Address insufficient static pressure (Ps) by inducing Ps into the system ductwork. Ensure grilles and access doors are installed and decrease fan speed if necessary.
  • L
    lopezgarySep 2, 2025
    Why Greenheck ERV-20 motor starters “chatter” or do not pull in?
    • M
      Michele FergusonSep 2, 2025
      If the motor starters in your Greenheck Fan are chattering or not pulling in, it could be due to: * Control power (24 VAC) wiring run being too long. Shorten the wiring run to the mechanical room or install a relay to turn the unit on/off. Consult the factory for relay information, as the resistance should not exceed 0.75 ohms. * Incoming supply power being less than anticipated. Increase the supply power or use a special control transformer sized for the actual supply power.
  • K
    Katie KellySep 5, 2025
    What to do if Greenheck Fan blowers turn off intermittently?
    • K
      Kim WhiteSep 5, 2025
      If one or both blowers in your Greenheck Fan turn off intermittently and then back on after about 2 minutes, it's possible that the exhaust-only frost control sensors are tripping. To resolve this, adjust the frost temperature sensor set point as needed.
  • J
    James NixonSep 7, 2025
    Why Greenheck Fan energy wheel runs intermittently?
    • M
      Mitchell MitchellSep 7, 2025
      If the energy wheel in your Greenheck Fan runs intermittently, it's likely due to wheel motor overloads tripping. This can be caused by rubbing between the wheel and air seals. Recheck the air seals to ensure they are not too tight.
  • C
    Carolyn SandersSep 10, 2025
    How to clear alarm from Greenheck Fan display?
    • S
      Samantha MurraySep 10, 2025
      Once you've identified the alarm and resolved the cause (e.g., replaced a faulty sensor) on your Greenheck Fan, you can clear the alarm from the display by following these steps: 1. Navigate to the alarm you want to clear. 2. Press the (enter) button. 3. When 'ERASE?' is displayed, press (enter) again. 4. 'ALARM ERASED' should appear. Press (escape) to complete the action and return to the previous menu.
  • F
    ffletcherSep 10, 2025
    Why Greenheck ERV-20 energy wheel does NOT turn?
    • A
      Aaron MasseySep 12, 2025
      If the energy wheel in your Greenheck Fan is not turning, consider the following: * The air seals might be too tight. * "Economizer" sensors might be operating. * There may be no power to the wheel motor; ensure the wheel drive is plugged in and verify power is available. * Check the wheel drive belt for looseness or breakage; replace if necessary. * There could be a VFD overload (OL1 on readout); refer to the VFD section and compare the motor amp rating to the setting in the VFD, adjusting accordingly.
  • R
    Rebecca BookerSep 12, 2025
    What to do if alarms signify a faulty sensor in Greenheck ERV-20 Fan?
    • F
      francisgravesSep 13, 2025
      If alarms on your Greenheck Fan signify a faulty sensor, verify that all connections to the sensor and controller are secure. Press enter twice to clear the alarm. If the issue continues, consult the factory.

Summary

General Safety Information

General Safety Precautions and Warnings

General safety instructions, DANGER, and CAUTION notices for safe operation and installation.

Installation - ERV-10, 20, 45 Models

Installation - ERV-90, 120 Models

Indoor Mounting Options

Diagrams and details for indoor installation of ERV-90, 120.

Outdoor Mounting Options

Diagrams and details for outdoor installation of ERV-90, 120.

Service Clearances

Recommended Service Clearances

Table of required clearances for accessing unit components.

ERV-10, 20, 45 Clearance Diagrams

Roof Curb Mounting

Curb Installation and Ductwork

Procedures for installing roof curbs and connecting ductwork.

Electrical Information

System Power and Grounding Requirements

Details on electrical grounding, wiring, and voltage tolerances.

Typical Control Center Components

Control Center Layout and Components

Identification and description of components within the unit's control center.

Optional Component Overview

Economizer Operation Modes

Details on economizer modes: stopping and modulating the wheel.

Frost Control Options

Explanation of timed exhaust, electric preheat, and modulating frost control.

Variable Frequency Drives (VFD) Function

Use of VFDs for fan speed control and economizer/frost control.

CO2 Sensor Application

Start-Up Procedures

General Start-Up Information and Safety

Comprehensive checklist and precautions for unit start-up.

Pre Start-Up Checklist

Steps to perform before initial unit energization.

Start-Up Checklist Execution

Data collection points during operational start-up.

Start-Up Components - Fans

Fan Inspection and Belt Drives

Checking forward curved fans, belt drives, and alignment.

Fan Belt Installation and Tensioning

Procedures for installing and tensioning fan belts.

Fan Wheel Rotation Verification

Fan RPM Adjustment and Motor Load

Adjusting fan speed and checking motor amperage.

Vibration, Wheel, Belt, and Seal Checks

Vibration Sources and Analysis

Energy Recovery Wheel Inspection

Drive Belt and Air Seal Inspection

Economizer Operation and Set Points

Economizer Relevant Set Points

Key set points for controlling economizer operation.

Using the Keypad Interface

Frost Control and Variable Frequency Drives

Timed Exhaust Frost Control

Electric Preheat Frost Control

Variable Frequency Drive (VFD) Wiring

Field wiring options for VFDs for modulating and multi-speed control.

VFD Factory Set Points and Configuration

Modulating Control Factory Settings

CO2 Sensor Control Settings

Multi-Speed Control Factory Settings

CO2 Proportional Control Settings

VFD Settings for CO2 Proportional Control

Variable Frequency Drives for Energy Recovery Wheel

ERV Wheel VFD Parameter Settings

Configuration parameters for VFDs controlling the energy recovery wheel.

Troubleshooting - Economizer Alarms

Addressing and Clearing Alarms

Steps to identify, address, and clear economizer alarms.

Troubleshooting - Airflow

Test and Balance Report Data

Troubleshooting - Unit Operation

Blower and Motor Starter Issues

Corrective actions for blower failure and motor starter problems.

Motor Over Amps and Low Airflow

Troubleshooting motor overloads and low airflow conditions.

Troubleshooting - Unit Intermittent Operation and Noise

Intermittent Blower and Wheel Operation

Diagnosing and resolving intermittent blower and wheel issues.

Excessive Noise and Vibration Troubleshooting

Identifying and correcting excessive noise or vibration problems.

Greenheck ERV-20 Specifications

General IconGeneral
BrandGreenheck
ModelERV-20
CategoryFan
LanguageEnglish

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