Greenheck ASSURE120 Energy Recovery Ventilator User Manual

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Greenheck ASSURE120 Energy Recovery Ventilator Manual

Introduction to the Greenheck ASSURE120 Energy Recovery Ventilator

The greenheck ASSURE120 Energy Recovery Ventilator is a compact residential energy recovery ventilator designed to provide balanced mechanical ventilation in homes and multifamily installations. It replaces stale indoor air with filtered outdoor air while transferring heat and moisture between the two airstreams. This helps improve indoor air quality while reducing the energy penalty typically associated with continuous ventilation.

Its low-profile housing is suitable for installations where mechanical space is limited, including bulkheads, dropped ceilings, and compact utility areas. The unit uses a cross-flow energy recovery core, factory-balanced airflow, removable filters, and a removable power pack to simplify service. Sensor-controlled fan defrost helps support operation in colder conditions.

The ASSURE120 is intended for homeowners, builders, HVAC contractors, and property managers who need dependable whole-home ventilation without installing a large air handler. Typical applications include tightly constructed residences, apartments, bedrooms, living areas, and homes where humidity, odors, or insufficient fresh air are concerns.

Control options include low- and high-speed operation, an integral dehumidistat, optional timers, intermittent ventilation controls, and compatibility with an optional PrecisionSYNC control. The system can be connected using plug-in or hardwired configurations, depending on the installation requirements. Proper duct sealing, airflow balancing, filter maintenance, and electrical installation are essential for safe and efficient operation.

Greenheck ASSURE120 Specifications and Features

Product type: Residential energy recovery ventilator with a cross-flow energy recovery core.
Ventilation range: Approximately 50 to 130 CFM, depending on configuration, duct system resistance, and fan-speed selection.
Electrical rating: 120 volts, 60 Hz, with a listed current rating of 1.4 amps.
Motor: PSC motor with multiple operating-speed selections.
Housing: Low-profile 20-gauge coated galvanized steel cabinet.
Dimensions: Approximately 20.75 inches wide, 19.375 inches deep, and 9.75 inches high.
Duct connections: Four 5-inch round duct collars.
Filters: Standard MERV 6 filters; a MERV 13 upgrade is available for enhanced particulate filtration.
Weight: Approximately 34 pounds.
Mounting: Ceiling mounting is supported for ASSURE120 models; follow the model-specific installation manual for approved arrangements.
Controls: Low/high-speed inputs, normally open or normally closed control options, integral dehumidistat, and optional timers and wall controls.
Construction compliance: UL 1812 compliant.
Service access: Allow approximately 25 inches of door clearance for filter and component servicing.
Warranty: The product submittal identifies a five-year warranty for the core and parts; confirm current terms for the exact model and installation.

How to Install and Set Up the Greenheck ASSURE120

Verify the installation: Confirm the model, voltage, accessories, duct collars, filters, mounting hardware, and control components before beginning work.
Select the location: Choose a serviceable ceiling location with adequate structural support. Maintain the recommended front clearance for removing the door and servicing filters.
Install the brackets: Attach the supplied mounting brackets to the unit and isolate them from the mounting surface where necessary to reduce vibration.
Secure the ventilator: Fasten the unit to the ceiling structure. Do not suspend it from unsupported ceiling material or ductwork.
Connect the ducts: Attach the four 5-inch ducts to the correct outdoor-air, exhaust-air, supply-air, and return-air connections. Seal every joint to prevent leakage.
Connect controls: Wire the low/high-speed controls, dehumidistat, timer, or optional wall control according to the model-specific wiring diagram.
Complete electrical work: Use a qualified electrician for hardwired connections and disconnect power before opening the cabinet.
Start and balance: Inspect the ductwork, open balancing dampers, confirm component operation, and balance supply and exhaust airflow with all unrelated exhaust fans turned off.

Never operate the ventilator with blocked ducts or missing filters. If the fan does not start, check the disconnect, circuit protection, control wiring, and selected operating mode before requesting service.

Greenheck ASSURE120 Troubleshooting Guide

Unit does not operate

Confirm that the electrical disconnect is on and that the circuit breaker has not tripped. Check the control wiring, wall-control setting, and any interlock connected to the system. Do not bypass safety devices or work inside the cabinet while power is connected.

Low or uneven airflow

Inspect both filters for loading, verify that all dampers are open, and check for crushed, disconnected, or excessively long duct runs. Airflow should be measured and balanced after installation rather than estimated from fan sound.

Excessive noise or vibration

Verify that the mounting brackets are secure and isolated from the structure. Check for loose panels, obstructed blowers, damaged duct connections, or objects contacting the cabinet. Flexible duct sections can help reduce transferred vibration when installed correctly.

Condensation or frost

Confirm that the outdoor and exhaust ducts are correctly connected, insulated where required, and protected against water entry. Ensure the defrost function and controls are operating. Persistent condensation may indicate incorrect airflow balance, high indoor humidity, or an installation problem.

Error codes and service support

The available product documentation does not identify a universal ASSURE120 numeric error-code list. Record the model and serial number, describe the symptoms, and contact Greenheck before replacing components. Greenheck support can be reached at 1-800-355-5354 or shop@greenheck.com. Keep installation records and follow the applicable warranty procedure; installation and removal costs may not be covered.

Greenheck ASSURE120 Pros and Cons

Advantages

Compact design: The low-profile cabinet fits locations that cannot accommodate a full-size ventilation air handler.
Energy recovery: Heat and moisture transfer helps reduce the heating and cooling impact of introducing outdoor air.
Flexible control: Multiple speed selections, dehumidistat operation, timers, and optional wall controls support different ventilation schedules.
Service-friendly construction: The removable door, filters, and power pack simplify routine maintenance.
Balanced ventilation: Separate supply and exhaust airstreams provide more controlled fresh-air exchange than relying only on intermittent exhaust fans.
Filtration options: Standard MERV 6 filters cover basic filtration, while the optional MERV 13 configuration can provide greater particle capture.

Limitations

Professional installation required: Correct duct routing, electrical work, airflow balancing, and control wiring are important for performance and safety.
Limited duct size: The 5-inch collars may require careful duct design to avoid excessive static pressure and noise.
Regular maintenance: Dirty filters and obstructed ducts can reduce airflow and increase operating strain.
Not a substitute for heating or cooling: The ASSURE120 ventilates and recovers energy but does not replace a furnace, air conditioner, or dedicated dehumidifier.
Best suited to compact residential applications: Larger homes or systems requiring substantially higher airflow may need a different ERV model.

Maintenance Tips for the ASSURE120 ERV

Inspect the filters regularly and replace or clean them according to their condition and the filter instructions.
Keep outdoor intake and exhaust hoods clear of leaves, snow, lint, and other obstructions.
Check duct connections for air leakage, damage, and insulation problems.
Schedule professional airflow verification if rooms feel stuffy or ventilation performance changes.
Disconnect electrical power before opening the cabinet or servicing internal components.

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Faqs

How do I set up the greenheck ASSURE120 Energy Recovery Ventilator for the first time?

Have a qualified HVAC professional install the greenheck ASSURE120 Energy Recovery Ventilator indoors using the supplied mounting brackets. The ASSURE120 is designed for ceiling mounting, uses 5-inch round duct connections, and requires a 120-volt electrical supply. Seal and support the ductwork, connect outdoor-air intake and exhaust-air ducts correctly, and leave approximately 25 inches of front clearance for servicing. Complete airflow balancing only after all components operate correctly.

What ductwork and appliances are compatible with the greenheck ASSURE120 Energy Recovery Ventilator?

The greenheck ASSURE120 Energy Recovery Ventilator uses 5-inch round duct collars and should be connected to dedicated outdoor-air intake, indoor supply-air, stale-air exhaust, and indoor return-air ductwork as shown in the installation manual. Do not connect a clothes dryer, range or stovetop exhaust fan, or central vacuum system to the ERV. These appliances can introduce excessive heat, grease, lint, or pressure that may damage the unit or disrupt ventilation.

Why is the greenheck ASSURE120 Energy Recovery Ventilator not providing enough airflow?

If the greenheck ASSURE120 has weak airflow, first check that filters are clean, balancing dampers are open, duct connections are sealed, and supply and exhaust grilles are unobstructed. Inspect flexible ductwork for kinks or crushing and verify that the unit is operating at the intended speed. Turn off competing exhaust fans while checking performance. If airflow remains low, have a qualified technician measure static pressure and rebalance the system.

How do I balance the greenheck ASSURE120 Energy Recovery Ventilator after installation?

Before balancing the greenheck ASSURE120 Energy Recovery Ventilator, seal the ductwork and confirm that the ERV, controls, grilles, and dampers operate properly. Fully open the balancing dampers and turn off household exhaust devices such as bathroom fans, range hoods, and clothes dryers. Measure supply and exhaust airflow with calibrated equipment, adjust dampers gradually, and verify that the final airflow remains balanced at the selected operating speed.

How do the controls and humidity features work on the greenheck ASSURE120 Energy Recovery Ventilator?

The greenheck ASSURE120 can be controlled with low- and high-speed inputs, an air-handler interlock, and compatible accessories such as timers or humidity-sensing controls, depending on the installed configuration. A timer can temporarily increase ventilation after activities such as bathing or cooking. A dehumidistat or humidity switch can call for higher airflow when indoor moisture rises. Follow the wiring diagram for the exact control package and disconnect power before changing connections.

What should I do if the greenheck ASSURE120 Energy Recovery Ventilator is noisy or vibrating?

Unusual noise from the greenheck ASSURE120 Energy Recovery Ventilator often results from loose mounting hardware, unsupported ductwork, restricted grilles, or a dirty filter. Turn off power, then inspect the cabinet, brackets, duct connections, and access door for looseness. Ensure mounting brackets are isolated from the mounting surface to reduce vibration. Do not drill additional cabinet holes. If a blower or motor continues to make abnormal noise, arrange professional service.

How often should I clean and maintain the greenheck ASSURE120 Energy Recovery Ventilator?

Inspect the greenheck ASSURE120 filters regularly and clean or replace them when loaded with dust; homes with pets, construction activity, or high occupancy may require more frequent attention. Keep outdoor hoods and indoor grilles clear, and inspect duct connections for leaks. Periodically clean the recovery core and cabinet according to the manual without damaging the media. Disconnect electrical power before opening the unit, and have airflow checked after major maintenance.

Can the greenheck ASSURE120 Energy Recovery Ventilator help control indoor humidity and reduce ventilation energy loss?

The greenheck ASSURE120 Energy Recovery Ventilator uses a total recovery core to transfer heat and moisture between incoming and outgoing airstreams while keeping the airstreams separate. This can reduce the heating or cooling penalty associated with outdoor-air ventilation and help moderate indoor humidity. Performance depends on climate, duct design, airflow balance, filter condition, and control settings. It is not a substitute for correcting plumbing leaks, infiltration, or excessive moisture sources.