Troubleshooting – Unit

Symptom

Possible Cause

Corrective Action

 

 

 

One or both

 

 

blowers turn off

 

Adjust frost temperature sensor set point as

intermittently and

Exhaust Only frost control sensors are tripping.

needed.

back on after

 

 

 

about 2 minutes

 

 

 

 

 

 

Air seals are too tight.

See Energy Recovery Wheel under Unit Start-Up

 

section.

 

 

 

 

 

 

“Economizer” sensors are operating.

Adjust temperature or enthalpy set points as

 

needed.

 

 

 

 

 

Energy wheel does

No power to wheel motor.

Make sure wheel drive is plugged in. Verify

NOT turn

power is available.

 

 

 

 

 

Wheel drive belt.

Check for loose or broken belts. Replace belts

 

(consult factory).

 

 

 

 

 

 

VFD overload. (OL1 on readout)

Refer to VFD section. Compare motor amp

 

rating to setting in VFD. Adjust accordingly.

 

 

 

 

 

Energy wheel runs

Wheel motor overloads are tripping, due to

Recheck air seals, make sure they are not too

tight. See Energy Recovery Wheel under Unit

intermittently

rubbing between wheel and air seals.

Start-Up Section.

 

 

 

 

 

 

Fan wheel rubbing on inlet.

Adjust wheel and/or inlet cone. Tighten wheel

 

hub or bearing collars on shaft.

 

 

 

 

 

 

Bearings.

Replace defective bearing(s). Lubricate

 

bearings. Tighten collars and fasteners.

 

 

 

 

 

 

Wheel out of balance.

Replace or rebalance.

 

 

 

 

Loose wheel on shaft.

Tighten wheel setscrew.

 

 

 

 

Loose motor or blower sheave.

Tighten sheave setscrew.

 

 

 

 

Belts too loose.

Adjust belt tension after 24 hours of operation.

Excessive noise

 

 

Belts too tight.

Loosen to maintain a 3/8 inch deflection per

or vibration

foot of span between sheaves.

 

 

 

 

 

 

Worn belt.

Replace.

 

 

 

 

Motor base or blower loose.

Tighten mounting bolts.

 

 

 

 

Buildup of material on wheel.

Clean wheel and housing.

 

 

 

 

Bearing and drive misaligned.

Realign.

 

 

 

 

 

Make sure ductwork is supported properly.

 

Noise being transmitted by duct.

Make sure ductwork metal thickness is sized for

 

proper stiffness. Check duct size at discharge to

 

 

 

 

ensure that air velocities are not too high.

 

 

 

Always have a completed Pre Start-Up Checklist, unit Start-Up Checklist, and Optional Accessories Checklist prior to requesting parts or service information.

34 Model ERV Energy Recovery Unit

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Greenheck Fan ERV-251, ERV-581, ERV-522, ERV-582, ERV-521, ERV-361 manual Troubleshooting Unit
Page 33 Page 35

ERV-361, ERV-251, ERV-521, ERV-582, ERV-522 specifications

Greenheck Fan has established itself as a leader in the design and manufacturing of high-performance ventilation systems, including its innovative energy recovery ventilators (ERVs). Among their popular models are the ERV-581, ERV-522, ERV-582, ERV-521, and ERV-251, each designed to enhance indoor air quality while optimizing energy efficiency.

The ERV-581 offers comprehensive ventilation solutions for commercial buildings, equipped with advanced heat recovery technology. This model features a robust, compact design, allowing for easy installation in limited spaces. Its efficient energy recovery capabilities transfer heat and moisture between incoming and outgoing airstreams, leading to significant reductions in heating and cooling costs. The ERV-581 also includes a user-friendly control panel for simplified operation.

Next in line, the ERV-522 is engineered for larger spaces, balancing higher airflow rates with enhanced energy recovery performance. This model is particularly beneficial for schools and office buildings, where maintaining fresh air quality is paramount. The ERV-522 employs a two-stage filtration system, ensuring that airborne pollutants are effectively captured before being circulated back into the environment. Its resilient construction further ensures longevity and durability in demanding applications.

The ERV-582 enhances the lineup with its dual-function capability, serving both as an energy recovery ventilator and a dehumidification system. This flexibility makes it an ideal choice for climates with high humidity levels, where moisture control is essential. The ERV-582 incorporates Greenheck’s patented technology for optimal performance under varying temperature and humidity conditions, making it a versatile solution for diverse environments.

The ERV-521 stands out with its eco-friendly design, featuring recyclable components that align with sustainable building practices. This model is particularly favored in LEED-certified projects, where energy efficiency and minimal environmental impact are essential. The ERV-521 also includes an intelligent control system that adjusts airflow rates based on occupancy levels, ensuring optimal energy usage.

Finally, the ERV-251 is a compact, energy-efficient model suited for residential installations. It is designed to fit seamlessly into homes, providing essential ventilation while reducing energy consumption. The user-friendly interface allows homeowners to monitor and adjust settings easily, making the ERV-251 a popular choice for those looking to improve indoor air quality without compromising on comfort.

Together, these Greenheck ERV models exemplify cutting-edge technologies and engineering, paving the way for healthier indoor environments while promoting energy conservation. Each unit is tailored to meet specific application needs, making them invaluable assets for any ventilation strategy.
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