Greenheck ERH-20 User Manual

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Page 1

Energy Recovery Ventilator with Heating

Model ERH

• Commercial • Institutional

• 10,000 cfm

• 1.5 in. wg external static pressure

April

2005

Page 2

Product Features

Model ERH

Energy Recovery Ventilator With Heating

With the ERH, you save money with the total energy wheel and get the convenience of supplemental heating. The ERH provides preconditioned air in the summer and space neutral air in the winter which is ideal if your climate has prominent summer and winter seasons. For applications requiring cooling, refer to Model ERCH.

Model ERH shown with optional indirect gas heater, supply filters, and exhaust filters.

Total Energy Wheel recovers

energy from the exhaust air stream and transfers it to the supply air stream. The wheel is constructed of a light-weight polymer and a permanently bonded silica gel desiccant. Eight wheel segments are easily removable for cleaning.

Optional Tempering Section provides supplemental

heating of the outdoor air after pre-conditioning by the energy wheel. Tempering options include indirect gas, hot water, and electric.

Standard Construction

With every ERH, you automatically receive:

✓ Forward Curved Blowers & Motor Assemblies

mounted on isolation bases with neoprene vibration isolators for smooth, quiet operation.

✓ A Control Box furnished with motor starters for

the supply blower, exhaust blower, and energy wheel motors.

✓ Double Wall Housing which provides a

galvanized steel-lined interior to prevent exposure of the insulation to the airstream.

✓ Access Doors to blowers, filters, energy wheel,

and heater section to simplify inspection and routine service.

✓ Single Point Wiring with a disconnect switch and

low voltage terminal strip.

❏

Hot Water

Indirect Gas

Electric

You Get a Product that is Simple to Operate:

• Fresh outdoor air is pre-conditioned by the total

enthalpy wheel, recovering a majority of the energy from the exhaust air.

- Saves 3-4 tons of cooling per 1000 cfm

- Saves 50-60 MBH of heating per 1000 cfm

• The heating section further tempers cold outdoor

air to desired conditions.

You Get a Product that is Flexible:

• Four housing sizes

• Airflow capacities up to 10,000 cfm

• External static pressures up to 1.5 in. wg

Greenheck certifies that the ERH models shown herein are licensed to bear the AMCA seal. The ratings shown are based on tests and procedures performed in accordance with AMCA publication 211 and comply with the requirements of the AMCA Certified Ratings Program.

Energy recovery wheels certified by the ARI Airto-Air Energy Recovery Ventilation Equipment Certification Program in accordance with ARI Standard 1060. Actual performance in packaged equipment may vary. Certified Ratings are available in the Certified Product Directory at http://www.ari.org/directories/erv

Page 3

1. Outdoor air enters ERH unit.

2. The energy recovery wheel cools and dehumidifies outdoor air using energy from the exhaust air stream. Load is reduced by 3 to 4 tons per 1,000 cfm for many climates.

20 30 40 50 60 70 80 90 100

180

160

140

120

100

Specific Humidity

Dry Bulb Temp.

Wet Bulb Temp.

70%

50%

30%

10%

Supply Air

Room Air

Outdoor Air

The ERH preconditions outdoor air for summer operation. For winter operation, a variety of heating options are available to expand the tempering capabilities of the energy recovery wheel.

See below for a description of the summer and winter processes along with a psychrometric illustration. The numbers on the drawing at the right correspond to the numbers on the psychrometric charts.

Whether a design day or part load day, the ERH lowers the temperature and moisture levels of summer outdoor air prior to entering the ventilation system. This means you can downsize the cooling equipment

and provide better humidity control to the space.

The ERH preconditions winter outdoor air typically to 45-65°F. If your design requires additional heating, three heating options are available:

• Electric

• Hot Water

• Indirect Gas

1. Outdoor air enters ERH unit.

2. The energy recovery wheel heats and humidifies winter outdoor air using energy from the exhaust air stream. Heating bills are significantly reduced and overly dry indoor conditions are eliminated.

3. The heating coil or furnace provides supplemental heating to further treat the outdoor air to desired supply conditions.

180

160

140

120

100

Specific Humidity

Dry Bulb Temp.

Wet Bulb T

emp.

90%

70%

50%

30%

10%

Supply Air

Room Air

Outdoor Air

Wheel

Heating

Coil

10 20 30 40 50 60 70 80 90 100

110

Tempering Capabilities

Winter

Typical Winter operation.

Fresh Outdoor Air

Exhaust Air from Space

Summer

Page 4

Air Performance

RPM 1141 1344 1498

1000 1142

BHP 0.36 0.51 0.53

RPM 1265 1426 1578 1857

1300 1485

BHP 0.55 0.72 0.90 1.05 RPM 1418 1553 1684 1934 2189

1600 1828

BHP 0.87 1.03 1.21 1.67 2.17

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-20M

RPM 1308 1446 1575 1816

1600 1828

BHP 0.74 0.89 1.04 1.37

RPM 1453 1574 1691 1907 2108 2306

1900 2171

BHP 1.10 1.27 1.45 1.80 2.19 2.65

RPM 1608 1717 1820 2020 2205 2375

2200 2514

BHP 1.57 1.77 1.96 2.39 2.79 3.20

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-20H

RPM 797 892 986 1166 1329

2200 2109

BHP 0.68 0.81 0.96 1.29 1.65

RPM 900 977 1053 1209 1359 1494 1628

2700 2588

BHP 1.10 1.25 1.40 1.77 2.18 2.58 3.03

RPM 1010 1079 1143 1274 1406 1533 1655 1768

3200 3068

BHP 1.67 1.87 2.04 2.41 2.86 3.33 3.82 4.29

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-45L

RPM 900 989 1071 1220 1360 1495

3200 2184

BHP 1.17 1.34 1.53 1.92 2.35 2.83

RPM 1004 1083 1157 1297 1422 1542 1654 1769

3800 2593

BHP 1.79 1.99 2.20 2.64 3.11 3.61 4.12 4.70

RPM 1114 1185 1252 1380 1499 1609 1713 1815

4400 3003

BHP 2.60 2.85 3.08 3.57 4.09 4.64 5.18 5.78

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-45H

RPM 749 832 906 1038 1155

4200 1989

BHP 1.54 1.82 2.10 2.65 3.21

RPM 839 913 982 1107 1216 1318 1412 1520

5100 2415

BHP 2.43 2.77 3.11 3.80 4.45 5.15 5.81 6.73

RPM 940 1003 1065 1181 1287 1382 1472 1558

6000 2842

BHP 3.67 4.05 4.45 5.26 6.06 6.84 7.64 8.44

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-55H

RPM 612 682 746 862 962 1058

6000 2066

BHP 1.99 2.37 2.75 3.52 4.33 5.21

RPM 723 783 841 941 1036 1122 1202 1275

8000 2755

BHP 3.91 4.41 4.95 5.94 6.97 7.98 9.08 10.14

RPM 845 897 946 1040 1124 1201 1277 1348

10,000 3444

BHP 7.00 7.56 8.18 9.50 10.78 12.00 13.29 14.52

CFM

EXTERNAL STATIC PRESSURE in inches of WG

0.50 0.75 1.00 1.50 2.00 2.50 3.00 3.50

ERH-90H

Gross supply air performance ratings (airflow, pressure, and power) are at port 2 with port 1, port 3 and port 4 at 0.0 in. wg. Gross exhaust air performance ratings (airflow, pressure, and power) are to port 3 with port 1, port 2 and port 4 at 0.0 in. wg. Power rating (BHP) does not include drive losses. Performance ratings do not include the effects of appurtenances in the airstream.

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Intake & Discharge Options

With the ERH, you have many air intake and discharge options available to simplify duct layout for rooftop and equipment room installations. Refer to the table below for the intake and discharge locations available for outdoor air (OA) and exhaust air (EA).

Bottom Top Side End OA Intake X X OA Discharge X X X

EA Intake X X X EA Discharge X X X

Exhaust

Intake

Exhaust

Discharge

Outdoor Air

Intake

Outdoor Air

Discharge

Bottom

End

To p

End

Side

Filter Pressure Drop (30%eff.)

The air performance data on page 4 accounts for the pressure drop across the energy recovery wheel and the internal housing losses, but does not include pressure drop for filters or tempering options. Add filter and/or tempering option pressure drop (from tables below) to external static pressure to determine correct rpm and horsepower.

NOTE: Coil data assumes 1 row heating coils.

Pressure Drop

Model CFM

(in. wg)

1000 0.04

ERH-20

2200 0.22

2200 0.06

ERH-45

4400 0.24

4200 0.09

ERH-55

6000 0.18

6000 0.10

ERH-90

10,000 0.27

Tempering Options Pressure Drop

Heating Coil Indirect Gas

Model CFM

(in. wg) (in. wg)

1000 0.02 0.03

ERH-20

2200 0.08 0.13

2200 0.04 0.09

ERH-45

4400 0.08 0.34

4200 0.04 0.10

ERH-55

6000 0.08 0.26

6000 0.03 0.24

ERH-90

10,000 0.08 0.55

End

Air Performance

Side

Side OA Discharge is ONLY available with the Indirect Gas (IG) heater.

End OA Discharge is NOT available with the Indirect Gas (IG) heater.

Page 6

Accessories

Weatherhoods

A louvered intake hood with 2-inch aluminum mesh filters, and an exhaust hood with an integral backdraft damper are available.

Dampers - Internally Mounted

A variety of motorized control dampers are available. Intake and exhaust dampers are internally mounted at the outdoor and exhaust air inlets. Dampers are factory wired to a single point power disconnect.

Filters

Standard size 2-inch, pleated, medium efficiency filters and filter racks are available for outdoor air and/or exhaust air streams.

Frost Control

In cold climates, the recovery wheel may develop frost, which will decrease airflow. Three factory mounted options are available to address frosting:

• Timed Exhaust Frost Control

The timed exhaust frost control turns the supply blower off and on intermittently. Control is triggered by an outdoor air temperature set point in conjunction with an increased pressure drop across the energy wheel.

• Modulating Wheel Frost Control

The modulating wheel frost control enables continuous unit operation. A variable frequency drive (VFD) reduces wheel speed when the outdoor air temperature falls below the frost threshold set point and upon an increase in the differential pressure across the energy wheel. The temperature and pressure differential set points are set at the factory, but are field-adjustable. The VFD will be fully programmed and wired at the factory.

• Preheat Frost Control

The preheat frost control enables continuous unit operation. An electric heater warms the outdoor air above the frost threshold before it enters the energy recovery wheel. Control is triggered by the outdoor air temperature set point in conjunction with increased pressure drop across the energy wheel.

Rotation Sensor

Senses when a wheel rotation failure occurs and sends a signal to an indicator light. The light is available on a remote control panel from the factory.

Discharge Temperature Control

Manual control is available allowing the user to adjust the discharge temperature off the heater as required.

Dirty Filter Sensors

Pressure taps sense excessive pressure drop across the filter and send a signal to a dirty filter indicator

light. Light and control box available from the factory.

Economizer Control (Free Cooling)

When cool outdoor air is available, the energy wheel may be controlled to provide free cooling. Economizer operation can be initiated by the unit sensors alone or in conjuction with a call for cooling (field wired) Two factory installed options are available.

• Wheel Off: De-energizes the wheel when the

outdoor temperature is below the field adjustable set point (enthalpy sensor also available). An automatic economizer override is included to engage the wheel for winter heating operation.

• Wheel Modulation: Modulates the energy

recovery wheel to maintain a 55°F discharge temperature during economizer operation.

Note: Control centers in Greenheck energy recovery ventilators enable the control of the energy wheel and fans via 24-volt control signals (by others). Controls by others may be preferred when air handling units are equipped with an economizer section.

Variable Air Volume

Model ERH utilizes belt driven blowers that are available with optional variable frequency drives.

Additional Accessories:

• Remote Panels

• GFCI Service Outlet (control power by others)

• Service Lights (control power by others)

• Spare Wheel Segments

• Roof Curbs

• Painted Exteriors

• Duct Flanges

• Sensible Wheel Only

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General: Energy Recovery Ventilator shall be as

manufactured by “Greenheck” or approved equal provided all specifications are met. Greenheck Model ERH is used as the basis of design. Units shall be Listed per ANSI/UL 1995, Heating and Cooling Equipment. Ventilators shall bear the AMCA Certified Ratings Seal for air performance. Energy transfer ratings of the energy recovery wheel shall be ARI Certified. Performance shall be as scheduled on plans. Exhaust discharge and outside air intake shall not be located on the same side on roof top units.

Unit Casing and Frames: Unit shall be of internal frame

type construction of galvanized steel. Frame and panels shall be G90 galvanized steel. All panels exposed to the weather shall be a minimum of 18 gauge galvanized steel. Unit shall be internally lined with galvanized sheet metal creating a double wall. Where top panels are joined there shall be an overlapping, standing seam to insure positive weather protection. All metal-to-metal seams shall be factory sealed, requiring no caulking at job site. Permatector exterior finish is available for outdoor units. Unit base to be designed for curb mounting. Unit base shall overhang the curb for a positive seal against water run-off.

Weatherhoods: Weatherhoods shall be the same finish as

the unit. Outdoor air weatherhood shall incorporate a louvered design and moisture eliminator. Weatherhoods shall be tested in accordance with AMCA Standard 500-L to prevent water penetration up to 3 in/hr at 29 mph.

Insulation: Unit casing to be insulated with 1 inch fiberglass.

Insulation shall meet requirements of NFPA 90A and tested to meet UL 181 erosion requirements. Insulation to be enclosed in double wall construction.

Energy Recovery Wheel: Wheel shall be of the enthalpy

type for both sensible and latent heat recovery and be designed to insure laminar flow. Energy transfer ratings must be ARI Certified to Standard 1060 and bear the ARI Certification symbol for ARI Air-to-Air Energy Recovery Ventilation Equipment Certification Program based on ARI

1060. Ratings “in accordance with 1060” without certification are not acceptable. Desiccant shall be silica gel for maximum latent energy transfer. Wheel shall be constructed of lightweight polymer media to minimize shaft and bearing loads. Polymer media shall be mounted in a stainless steel rotor for corrosion resistance.

Wheel design shall consist of removable segments for ease of service and/or cleaning. Silica gel desiccant shall be permanently bonded to wheel media to retain latent heat capability after cleaning. Wheels with sprayed on desiccant coatings are not acceptable. Wheels with desiccant applied after wheel formation are not acceptable. Energy recovery device shall transfer moisture entirely in the vapor phase.

Energy recovery drive belt material shall be high strength urethane and shall be factory installed in a pre-stretched state, eliminating the need for field belt tension adjustment. Link style belts are not acceptable.

Access Doors: All components shall be easily accessible

through removable doors for exhaust, supply, filter, and damper compartments. Energy recovery wheels (smaller than 58 inches) shall be mounted in a slide-out track for ease of inspection, removal, and cleaning.

Roof Curbs: Roof curb to be supplied by unit manufacturer

for field assembly. Curb shall consist of die formed

galvanized steel sections. Curb shall be full perimeter type with gasketing provided for field installation between curb and unit base.

Fan Sections: Centrifugal fans to be double width, double

inlet, forward curved type. All blower wheels shall be statically and dynamically balanced. Ground and polished steel fan shafts shall be mounted in permanently lubricated, sealed ball bearing pillow blocks. Bearings shall be selected for a minimum (L10) life in excess of 100,000 hours at maximum cataloged operating speeds. Separate motors for exhaust and supply blowers shall be provided. Adjustable sheaves on belt-driven fans with motors less than 10 hp shall allow independent balancing of exhaust and supply airflow. Fan and motor assemblies are mounted to unit base with neoprene isolators as standard. Fans shall be located in draw-through position in reference to the energy recovery wheel.

Motors and Drives: Motors shall be energy efficient,

complying with EPACT standards, for single speed ODP and TE enclosures. Motors shall be permanently lubricated, heavy-duty type, matched to the fan load and furnished at the specified voltage, phase, and enclosure. Drives shall be sized for a minimum of 150% of driven horsepower. Pulleys shall be of the fully machined cast type, keyed and securely attached to the fan wheel and motor shafts; 10 horsepower and less shall be supplied with an adjustable drive pulley. Energy wheel motors shall have integral overload protection.

Filters: Supply and exhaust air filters shall be 2-inch thick

pleated fiberglass, 30% efficient and tested to meet UL Class

2. Filter racks shall be die-formed galvanized steel.

Electrical: All internal electrical components shall be factory

wired for single point power connection. Units with electric reheat will be wired with independent power supply. All electrical components shall be UL Listed, Approved, or Classified where applicable and wired in compliance with the National Electrical Code.

Weatherproof, integral door interlocking disconnect switch, motor starters, control circuit fusing, control transformer for 24 VAC circuit, and terminal strip shall be supplied as standard components in the control center. Motor starters consist of a contactor and Class 20 electronic adjustable overload protection and shall be provided for all fan motors in the unit.

Indirect Gas: Indirect fired gas furnace shall be 80%

efficient, UL Certified and Listed per ANSI Z83.8 - 2002, C.G.A. approved per 2.6 - 2002 and have a blow through fan design. Furnace shall be capable of operation with natural or LP gas and have a power venting system. The burner and heat exchanger shall be constructed of aluminized steel. Standard furnace features shall include main gas pressure regulator, main gas valve, electronic staged or electronic modulating controls, direct spark ignition system, high limit and a 24 volt control transformer.

Hot Water Coil: Hot water coil shall be factory tested and

rated in accordance with ARI 410. Coils shall have copper tubes with permanently expanded aluminum fins, 12 fpi or less.

Electric Heat: Electric heat shall be UL listed and circuit

fused per NEC over 48 amps. Heater shall be SCR control, factory wired and installed. Control will be 24 volt with class 2 transformer. Standard air flow switch to shut down heater if air ceases to flow across heater.

Typical Specifications

Page 8

Unit Size A B C D E F

Approximate Weight

(lbs.)

ERH-20

78 50 56 18 18 9 1000

ERH-45

86 69 66 16 20 11

1800

ERH-55

99 70 76 16 25 11

2500

ERH-90

111 85 96 16 27 11 4500

All dimensions shown are in inches. Actual weight is dependent upon unit configuration

Dimensional Data

Our Warranty

Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year from the purchase date. The energy recovery wheel is warranted to be free from defects in material and workmanship for a period of five years from the purchase date. Any units or parts which prove defective during the warranty period will be replaced at our option when returned to our factory, transportation prepaid. Motors are warranted by the motor manufacturer for a period of one year. Should motors furnished by Greenheck prove defective during this period, they should be returned to the nearest authorized motor service station. Greenheck will not be responsible for any removal or installation costs.

As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice.

Greenheck P.O. Box 410 • Schofield, WI 54476-0410 • Phone (715) 359-6171 • greenheck.com

Side View

To p

View

Dimensions and Weight

Hood

Outdoor Air

2 in. filters

Wheel Cassette

FAD

Optional

IG Heater

Exhaust

Hood

Outdoor Air Hood

Electrical Box

2 in. filters

Wheel Cassette

2 in. filters

Optional

IG Heater