Greenheck Fan ERV-361, ERV-581, ERV-522 Roof Curb Mounting, Curb Outside Dimensions and Weights

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Roof Curb Mounting

Roof curb details including duct location dimensions, are available on ERV-522 & 582 Roof Curb Assembly Instructions, Part #460988.

Rooftop units require curbs to be mounted first. The duct connections must be located so they will be clear of structural members of the building.

1.Factory Supplied Roof Curbs: Roof curbs are Model GPI or GPNS for the ERV-251, 361, 521, 581. The GPI or GPNS ships assembled and includes a duct adapter.

Roof curbs are Model GKD for the ERV-522 and

582. The GKD ships in a knockdown kit (includes duct adapter) and requires field assembly (by others). Assembly instructions are included with the GKD curbs.

2.Install Curb: Locate curb over roof opening and fasten in place. (Refer to Recommended Roof Openings). Check that the diagonal dimensions are within ±1/8 inch of each other and adjust as necessary. For proper unit operation, it is important that the installation be level. Shim as required to level.

3.Install Ductwork: Installation of all ducts should be done in accordance with SMACNA and AMCA guidelines. Duct adapter provided to support ducts prior to setting the unit.

4.Set the Unit: Lift unit to a point directly above the curb and duct openings. Guide unit while lowering to align with duct openings. Roof curbs fit inside the unit base. Make sure the unit is properly seated on the curb and is level.

Curb Outside Dimensions and Weights

W

 

L

 

L

 

W

ERV-251, 361, 521 and 581

ERV-522 and 582

 

 

 

 

 

 

Unit Size

L

 

W

 

Curb Weight (lbs.)

 

 

 

 

 

 

ERV-251

42.5

 

30.5

 

60

 

 

 

 

 

 

ERV-361

58.5

 

47.5

 

115

 

 

 

 

 

 

ERV-521

63.5

 

63.5

 

160

 

 

 

 

 

 

ERV-581

71.8

 

66

 

185

 

 

 

 

 

 

ERV-522

120.5

 

80.5

 

520

 

 

 

 

 

 

ERV-582

142.25

 

93

 

700

 

 

 

 

 

 

All dimensions are in inches. Weights are for 12-inch high GPI type curbs.

Curb Outside Dimensions - continued

Side of Unit

 

Base

 

 

 

 

A

 

B

 

 

C

 

 

D

 

 

E

1-inch Insulation

 

 

Roof Curb

Curb Cap Details for Factory Supplied Roof Curbs

Unit Size

A

B

C

D

E

 

 

 

 

 

 

ERV-251

1.75

2.00

1.00

1.125

0.750

 

 

 

 

 

 

ERV-361

1.75

2.00

1.00

1.200

0.875

 

 

 

 

 

 

ERV-521

1.75

2.00

1.00

0.813

0.875

 

 

 

 

 

 

ERV-581

1.75

2.00

1.00

0.813

0.750

 

 

 

 

 

 

ERV-522

1.813

4.00

1.75

1.000

0.750

 

 

 

 

 

 

ERV-582

1.938

4.125

1.938

1.125

0.625

 

 

 

 

 

 

All dimensions are in inches.

Ductwork Connections

Examples of poor and good fan-to-duct connections are shown. Airflow out of the fan should

be directed straight or curve the

 

 

same direction as the

 

 

 

 

 

fan wheel rotates. Poor

 

 

 

tion

 

 

 

 

 

 

 

a

 

 

 

 

 

 

t

 

duct installation will

 

R

o

 

 

 

 

 

 

 

 

 

 

 

result in low airflow and

 

 

 

 

other system effects.

 

 

 

 

POOR

 

 

 

 

 

 

 

 

 

 

 

tion

Length of Straight Duct

 

 

a

 

t

 

R

o

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GOOD

Recommended Discharge Duct Size and Length

Model

Blower Size

Duct Size

Straight Duct Length

 

 

 

 

ERV-251

10

9 x 9

36

 

 

 

 

ERV-361

10

14 x 14

36

 

 

 

 

ERV-521

12

20 x 20

36

 

 

 

 

ERV-581

15

28 x 28

60

 

 

 

 

ERV-522S

15

28 x 28

60

 

 

 

 

ERV-522H

18

32 x 32

60

 

 

 

 

ERV-582

20

34 x 34

72

 

 

 

 

All dimensions shown in inches.

Recommended duct sizes are based on velocities across the cfm range of each model at approximately 800 feet per minute (FPM) at minimum airflow and up to 1600 fpm at maximum airflow. Recommended duct sizes are only intended to be a guide and may not satisfy the requirements of the project. Refer to plans for appropriate job specific duct size and/or velocity limitations.

Straight duct lengths were calculated based on 100% effective duct length requirements as prescribed in AMCA Publication 201. Calculated values have been rounded up to nearest foot.

Model ERV Energy Recovery Unit 5

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Contents Models ERV-251 ERV-361 ERV-521 ERV-581 ERV-522 ERV-582 General Safety InformationReceiving Inspection and Maintenance during StorageUnpacking HandlingSupplemental Installation Operation and Maintenance Manuals Table of ContentsInstallation Basic OperationRecommended Roof Opening LiftingCurb Outside Dimensions Curb Outside Dimensions and WeightsRoof Curb Mounting Ductwork ConnectionsRail Mounting / Layout ERV-251, ERV-361, ERV-521, ERV-581 ERV-522, ERV-582 Service ClearancesArrangement a Arrangement B, C or DElectrical Information Field Control Wiring Length/GaugeUnit Accessories ERV-251, ERV-361, ERV-521, ERV-581 ERV-522 Access Panel Description and LocationOutdoor Air Dimensional Data Arrangement C Arrangement D ERV-522 Unit Size Exterior DimensionsFrost Control Application/Operation Optional AccessoriesFrost Threshold Temperatures Indoor RH @ 70F Economizer Application/Operation Testing Temperature Sensor with OverrideModulating the Wheel Enthalpy Sensor with OverrideDrive Operation Variable Frequency Drives for Energy Recovery BlowersFactory Set Points Resetting the drive to factory defaults Variable Frequency Drives for Energy Recovery WheelEconomizer Signal Source 10 VDCTransformer Typical Wiring DiagramRotation Sensor Service OutletDirty Filter Sensor CO2 SensorIndicator Lights powered by the ER Unit Remote Control Panel and Wiring SchematicsDay Timer or On/Off Switch Hand/Off/Auto SwitchSensors Mounted by Factory Temperature Sensors 1K Ohm RTDPressure Sensors analog or digital Amp Current Sensors analog or digitalStart-Up Checklist Pre Start-Up Checklist check as items areStart-Up General Start-Up InformationOptional Accessories section Optional Accessories ChecklistEconomizer Application / Operation section Variable Frequency Drives sectionUnit Start-Up Vibration Energy Recovery WheelDrive Belt Air SealsMaintenance Procedures Lubrication Routine MaintenanceFan Belts Fan MotorsDoor Seal Maintenance External Filter MaintenanceEnergy Recovery Wheel Maintenance Internal Filter MaintenanceWheel segment removed Accessing the Energy Recovery Wheel in Models ERV-522Removing the Energy Recovery Wheel in ERV-251 Energy Recovery Wheel Bearing Cleaning the Energy Recovery WheelEnergy Recovery Wheel Belt Inside layout of ERV-361 Inside layout of ERV-522 Parts ListSequence of Operation Other AccessoriesBasic Unit Summer OperationTroubleshooting Airflow Symptom Possible Cause Corrective Action Troubleshooting UnitTroubleshooting Unit Maintenance Log Warranty

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.