Greenheck Model erch –– Packaged Air-to-Air Energy Recovery Units with Optional Heating and/or Cooling

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Product Specification Guide

Greenheck Model ERCH –– Packaged Air-to-Air Energy Recovery Units with Optional Heating and/or Cooling

For Outdoor or Indoor Installation

CSI MasterFormat Category 23 XX XX

(Greenheck suggests the use of category # 23 72 23)


Note to User: This document is subject to copyright protection and is proprietary to Greenheck Fan Corporation. However, Greenheck Fan Corporation authorizes the user a limited non-exclusive license to use this document or portions of it for the purpose of preparing written product specifications for the above CSI MasterFormat category. All information in this document as provided by Greenheck Fan Corporation is informational in nature and is provided without representation or warranty of any kind as to the user or any other party, including, without limitation, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE, OR NON-INFRINGEMENT. To the greatest extent permitted by applicable law, Greenheck Fan Corporation assumes no liability, and User assumes all liability and risk, for the use or results from the use of this document or the information contained herein, whether as modified by the user or not. Users should consult to verify that this document represents the most current version.

Illustrations of many features and components are provided in Addendum A. Supplementary information on the optional Digital Scroll™ compressor is included in Addendum B.

Note that within the Model ERCH product line, one model has integral Packaged DX. That model is labeled the ERCH-PDX and is illustrated on the addendum. It has different clearance requirements because of the attached condenser coils and fans. Addendum B contains supplementary information on the Digital Scroll™ compressor option available for the ERCH-PDX.

If a water source heat pump is desired as a primary means of cooling and heating, use the Specification Guide for Greenheck Model ERCH-HP.

Specifier Notes: This product specification guide is written in accordance to the Construction Specifications Institute (CSI) Format - 2004 Edition.

This section must be carefully reviewed and edited by the Engineer to meet the requirements of the project and local building code. Coordinate with other specification sections and the drawings.

Delete all unnecessary “Specifier Notes” when editing this section.



    1. SUMMARY

  1. This section includes units with integral Choose One [heating] [cooling] [heating and cooling] for [rooftop] [indoor] [outdoor] installation. Integral Energy Recovery device shall be a rotary air-to-air total enthalpy wheel. [Integral heat source shall be [Indirect Gas-Fired furnace] [hot water] [electric heat]]. [Integral cooling source shall be [chilled water] [split system DX] [packaged DX]]. Airflow arrangement shall be [Outdoor Air only] [Outdoor Air with Unoccupied Recirculation]. Each unit shall be constructed in a horizontal configuration and shall incorporate additional product requirements as listed in Section 2 of this specification. Specify that Supply Air may be either end or top discharge. The unit, when equipped with a gas furnace, has downblast discharge only as a standard configuration. If unit is intended for installation on a concrete slab, verify design requirements and construction responsibility for the slab.

  2. Related sections include the following:

  1. Section 22 00 00: Scope of Work

  2. Section 22 01 00: General Provisions

  3. Section 22 07 00: Insulation

  4. Section 22 10 00: Plumbing

  5. Section 23 09 00: Controls & Instrumentation

  6. Section 23 00 00: Electrical

Include any other applicable specification divisions.

    1. SUBMITTALS (This section should include all data needed by A/E to verify suitability of product for each application. As a minimum, it should include CAPS data and IOM).

  1. Product Data: For each type or model include the following:

  1. Complete fan performance curves for Supply and Exhaust Air with system operating conditions indicated, as tested on an AMCA Certified Chamber.

  2. Sound performance data for Supply and Exhaust Air, as tested on an AMCA Certified chamber.

  3. Motor ratings, electrical characteristics and motor and fan accessories.

  4. [Performance ratings for all chilled water or DX coils].

  5. Dimensioned drawings for each type of installation, showing isometric and plan views, to include location of attached ductwork and service clearance requirements.

  6. Estimated gross weight of each installed unit.

  7. Installation, Operating and Maintenance manual (IOM) for each model.

  8. [Microprocessor Controller (DDC) specifications to include available options and operating protocols. Include complete data on all factory-supplied input devices]. If unit is to be controlled by a BMS, verify compatibility of operating protocol. See also: “Operating Protocol” in this document.

  9. [Remote Panel description to include all functions] Note: You may specify a Remote Panel in lieu of a Microprocessor Controller.

  10. [AHRI Certified coil performance ratings with system operating conditions indicated. Ratings shall be in accordance with Standard 410].

  11. [Color chart including a palette of available standard paint finishes].

  12. Energy wheel performance data for both summer and winter operation.

  13. [Furnace ducting requirements for indoor installations].

  14. [Electrical consumption data and construction specification for electric heater, to include heat output, warranty and safety certifications].


  1. Source Limitations: Obtain unit with all appurtenant components or accessories from a single manufacturer.

  2. For the actual fabrication, installation, and testing of work under this section, use only thoroughly trained and experienced workers completely familiar with the items required and with the manufacturer's current recommended methods of installation.

  3. Product Options: Drawings must indicate size, profiles and dimensional requirements of Energy Recovery Unit and are to be based on the specific system indicated. Refer to Division 1 Section “Product Requirements”.

  4. Certifications

    1. Entire unit shall be AMCA Certified for air flow. AMCA certification of individual components is not acceptable. Certification of individual components does not demonstrate AMCA compliance of components when used in aggregate.

    2. Entire unit shall be ETL Certified per U.L. 1995 and bear an ETL sticker.

    3. Energy Wheel shall be AHRI Certified, per Standard 1060.

    4. [Coils shall be Recognized Components for ANSI/UL 1995, CAN / CSA C22.2 No 236.05. DX and water coils shall be AHRI Certified per standard 410-2001].

    5. [Indirect gas-fired furnace shall be ETL certified as a component of the unit].


  1. Coordinate size and location of all building penetrations required for installation of each unit and associated plumbing and electrical systems.

  2. [Coordinate location of water system fittings to ensure correct positioning for connection to the water coil and condensate drain pipe].

  3. Coordinate sequencing of construction of associated plumbing, HVAC, electrical supply. [roofing contractor]


  1. Furnish extra materials described below that match products installed and that are packaged with protective covering for storage and identified with labels describing contents.

  1. Filters: [(Insert quantity) set(s) of MERV 8 or MERV 8 and MERV 13] disposable filters for each unit. When MERV 13 filters are specified, they are used in tandem with MERV 8 pre-filters for Supply Air only.

  2. One set of [fan] [energy wheel] belts


  1. Available Manufacturers: Subject to compliance with specifications contained within this document, manufacturers offering products that may be incorporated into the work include, but are not limited to:

    1. Greenheck Fan Corporation

2.2 MANUFACTURED UNITS Indicate major components that must be included as part of the unit.

  1. Unit shall be fully assembled at the factory and consist of an insulated metal cabinet, [louvered outdoor air intake with metal mesh filter assembly], [condensate drain pan], [P trap], Energy wheel, [chilled water] [hot water] [chilled water and hot water] coils, [compressed refrigerant coils], [electric preheater], [hot gas reheat coil], [electric post-heater], [indirect gas furnace], [packaged DX system], [motorized dampers], [motorized recirculating damper], [sensors], [curb assembly], [service receptacle], [vapor-tight light fixtures], [return air grate], filter assembly for intake air and exhaust air, supply air blower assembly, exhaust air blower and an electrical control center. All specified components and internal accessories factory installed and tested and prepared for single-point high voltage connection.


  1. Materials: Formed double wall insulated metal cabinet, fabricated to permit access to internal components for maintenance.

    1. Outside casing: 18 gauge, galvanized (G90) steel meeting ASTM A653 for components that do not receive a painted finish. [Pre-painted components as supplied by the factory shall have polyester urethane paint on 18 gauge G60 galvanized steel]. Note: pre-painted polyester on G60 galvanized steel provides highest corrosion resistance. [Components that receive a painted finish per A/E specification shall be of 18 gauge type A60 galvanneal steel and shall be painted with a baked industrial enamel finish]. [Components that receive a painted finish per A/E specification shall be painted with a polyester urethane powder coat]. Note: higher corrosion-resistant finishes such as “Hi-Pro Polyester” are available for use in coastal areas or installation in corrosive atmospheres such as wastewater treatment plants. An excellent reference on protective coatings can be found at:

    2. Internal assemblies: [18 gauge, galvanized (G90) steel] except for motor supports which shall be minimum14 gauge galvanized (G90) steel. Inner wall of double wall construction shall be minimum 24 gauge G90 steel.

  1. Cabinet Insulation: Comply with NFPA 90A and NFPA 90B and erosion requirements of UL 181.

    1. Materials: Fiberglass insulation. If insulation other than fiberglass is used, it must also meet the Fire Hazard Classification shown below.

    1. Thickness: 1 inch (25 mm)

    2. Fire Hazard Classification: Maximum flame spread of 25 and smoke developed of 50, when tested in accordance with ASTM C 411.

    3. Location and application: Full coverage of entire cabinet exterior to include walls, roof and floor of unit. Insulation shall be of semi-rigid type and installed between inner and outer shells of all cabinet exterior components.

  1. Access panels / doors: Unit shall be equipped with insulated, hinged doors or removable access panels to provide easy access to all major components. Doors and access panels shall be fabricated of 18 gauge galvanized G90 steel.

  2. [Condensate drain pan: Pan shall be formed of welded austenitic stainless steel sheet material and provided with a welded drain connection at the front for connection to a P trap. Drain pan shall be sloped in two directions to provide positive draining].

  3. [P trap: An engineered P trap (condensate drain) assembly shall be provided for each unit, to include cleanout ports, cleanout tool, vacuum break device and see-through reservoir to permit visual verification of water or glycol solution levels].

  4. Energy wheel: Energy wheel shall be of total enthalpy, rotary air-to-air type and shall be an element of a removable energy wheel cassette. The cassette shall consist of a galvanized steel framework (designed to produce laminar air flow through the wheel), an energy wheel as specified and a motor and drive assembly. The cassette shall incorporate a pre-tensioned urethane drive belt with a five year warranty. Note to A/E: Various energy wheel manufacturers are known to build non-segmented wheels. Segmented wheels are known to provide substantial time and labor saving benefits over the entire life of the energy wheel. The wheel media shall be a polymer film matrix in a stainless steel framework and be comprised of individual segments that are removable for servicing. Non-segmented energy wheels are not acceptable. Silica gel desiccant shall be permanently bonded to the polymer film and is designed and constructed to permit cleaning and servicing. The energy wheel is to have a five year warranty. Performance criteria are to be as specified in AHRI Standard 1060, complying with the Combined Efficiency data in the submittal.

  5. [[Chilled water] [Hot water] [Chilled water and hot water] coil(s) shall be factory installed and meet the design requirements as above.]

  6. [Compressed refrigerant coils shall be AHRI Certified and shall be (silver) soldered or brazed into the compressed refrigerant system. Coil shall be constructed of copper tubing, permanently bonded to aluminum fins and enclosed in a galvanized steel frame. If two compressors are used as components of a packaged DX system in the unit, then the evaporator coil shall be of “interlaced” configuration, permitting independent operation of either compressor without conflict with the other compressor].

  7. Supply Air and Exhaust Air blower assemblies: Blower assemblies consist of an electric motor as specified by A/E and a belt driven blower. Assembly shall be mounted on heavy gauge galvanized rails and further mounted on 1.125 inch thick neoprene vibration isolators.

  8. Control panel / connections: unit shall have an electrical control center where all high and low voltage connections are made. Control center shall be constructed to permit single-point high voltage power supply connections. Optional electric post heater shall have a separate electrical control center and separate high voltage power circuit as shown on the plans.

  9. [Electric preheater shall be provided for frost control of the energy wheel. Preheater assembly shall include a thermostat and pressure sensor on the wheel assembly to initiate frost control sequence. Preheater shall comply with UL 1995 and be constructed on a galvanized steel frame]. [Timed exhaust shall be provided for frost control of the energy wheel. Control system shall include an outdoor air thermostat and pressure sensor on the wheel assembly to initiate frost control sequence]. [Modulating frost control. Control system shall include an outdoor air thermostat and pressure sensor on the wheel assembly to initiate frost control sequence].

  10. [Reheat Coil with factory installed modulating hot gas reheat valve] The reheat coil is for humidity control.

  11. [Electric Post-heater: Post-heater shall be SCR control and shall include a temperature sensor with field adjustable set point, located in the outdoor air stream. Heat output of the post-heater shall be infinitely variable]. Electric post-heater size / capacity shall be as specified by A/E.

  12. [Indirect gas furnace]:

        1. Shall be ETL Certified as a component of the unit.

        2. Shall have an integral combustion gas blower.

        3. Shall be ETL Certified for installation downstream of a cooling coil.

        4. Shall have fault sensors to provide fault conditions to optional digital controller or building controls.

        5. Shall have 4-pass tubular heat exchangers, constructed of [aluminized steel] [type 409 stainless steel]. Heat exchanger tubes shall be installed on the vest plate by means of swaged assembly, welded connections are not acceptable. Heat exchanger tubes shall be supported by a minimum of two fabricated assemblies that support the tubes and also permit expansion and contraction of the tubes. Welded connections between heat exchanger tubes and the vest plate are known to be a source of failure due to expansion and contraction. 409 stainless steel is considered the most suitable material for high temperature gases, such as automotive exhausts. Manufacturer recommends the use of stainless steel heat exchangers for applications with a temperature rise of 60° F or more. Tubular heat exchangers are considered the industry standard, but some manufacturers are known to construct “clamshell” or other type exchangers. The same requirements for material types and assembly methods and supports should apply to all.

        6. Heat exchanger shall have a [one year warranty] [5 year extended warranty] [10 year extended warranty]. 5 year and ten year extended warranties are only for stainless steel heat exchangers

        7. Furnace control shall be [2 stage] [2:1 Modulating] [4:1 Modulating]

        8. Shall be encased in a weather-tight metal housing with intake air vents. Large, metal lift-off door shall provide easy access to the enclosed vest plate, control circuitry, gas train, burner assembly and exhaust blower. Indicate any other requirements such as furnace output, controls, etc.

        9. [Shall have solid state controls permitting stand-alone operation or control by building controllers].

        10. [Shall include kit for indoor mounting [separated 2 pipe] [concentric venting] [basic indoor venting]].

  13. [Packaged DX System: unit shall have an integral compressor(s) and evaporator coil located within the weather-tight unit housing. Condenser coils and appurtenant condenser fan assemblies shall be factory installed as integral subassemblies of the unit and mounted on the exterior of the unit. Condenser fan motors shall be three phase, type 56 frame, Open Air Over and Shaft Up. Each condenser fan motor shall have a vented frame, rated for continuous duty and be equipped with an automatic reset thermal protector. Motors shall be UL Recognized and CSA Certified. The refrigerant compressor(s) shall be [digital] See Spec Guide Addendum B for supplementary information. hermetic scroll-type and shall be equipped with liquid line filter drier, thermostatic expansion valves (TXV)(s), manual reset high pressure and low pressure cutouts and all appurtenant sensors, service ports and safety devices. Compressed refrigerant system shall be fully charged with R-410A refrigerant. Each compressor shall be factory-equipped with an electric crankcase heater to boil off liquid refrigerant from the oil. The use of an electric crankcase heater is an essential unit-protective device in most climates. See IOM, Subassembly Description. [Hot gas bypass shall be provided on the lead circuit to prevent icing of the evaporator coil under low load conditions]. Hot gas bypass is not used with digital scroll compressors.

  14. [Packaged DX Control and Diagnostics: The Packaged DX system shall be controlled by an onboard digital controller (DDC) that indicates both owner-supplied settings and fault conditions that may occur. The DDC shall be programmed to indicate the following faults:

      1. Global alarm condition (active when there is at least one alarm)

      2. Supply Air Proving alarm

      3. Dirty Filter Alarm

      4. Compressor Trip alarm

      5. Compressor Locked Out alarm

      6. Supply Air Temperature Low Limit alarm

          1. Sensor #1 Out of Range (outside air temperature)

          2. Sensor #2 Out of Range (supply air temperature)

          3. Sensor #3 Out of Range (cold coil leaving air temperature)]

  1. [Motorized dampers: [Exhaust Air] [Intake Air] [Exhaust Air and Intake Air] Motorized dampers of [low leakage] [insulated low leakage] type shall be factory installed].

  2. [Motorized Recirculating Air Damper designed to permit 100% recirculation of exhaust air shall be factory installed. Damper shall be controlled by [2-position switch] [time clock] [building pressure control]]. Controls are supplied by Greenheck as part of a Remote Control Panel. Assign responsibility for installation of panel and indicate location of panel. It is also possible to control the recirculating air function by means of a BMS, without using factory-supplied controls. Recirculating Air option is only used during unoccupied periods.

  3. [Sensors are considered to be part of various optional operational modes or device controllers and are to be factory supplied and installed as specified by the A/E]. See IOM / Sensors Installed by Factory

  4. [Curb Assembly: Greenheck recommends the use of an engineered curb assembly in lieu of an owner-supplied rail system. The curb assembly provides full perimeter support of the unit and ensures proper flashing and insulation of all roof penetrations and provides adequate clearance for a P trap assembly. A curb assembly made of 14 gauge galvanized steel shall be provided by the factory for assembly and installation as part of this division. The curb assembly shall provide perimeter support of the entire unit and shall have duct adapter(s) for [supply air] [and return air]. Curb assembly shall enclose the underside of the unit and shall be sized to fit into a recess in the bottom of the unit. Contractor shall be responsible for coordinating with roofing contractor to ensure curb unit is properly flashed to provide protection against weather/moisture penetration. Contractor shall provide and install appropriate insulation for the curb assembly].

  5. [Service receptacle: 120 VAC GFCI service outlet shall be factory-provided and installed by this contractor in a location designated by the A/E]. Service outlet requires a dedicated single phase electric circuit.

  6. [Vapor-tight light fixtures shall be factory installed in each compartment of the unit and wired to a junction box mounted on the outside of the unit]. Vapor-tight lights require dedicated single phase electric service.

  7. [Return Air Grate]


        1. Blower section construction, Supply Air and Exhaust Air: Belt drive motor and blower shall be assembled onto a 14 gauge galvanized steel platform and must have neoprene vibration isolation devices.

        2. Blower assemblies: Shall be statically and dynamically balanced and designed for continuous operation at maximum rated fan speed and horsepower.

        3. Centrifugal blower housing: Formed and reinforced steel panels to make curved scroll housing with shaped cutoff.

        4. Forward curved blower (fan) wheels: Galvanized or aluminum construction with inlet flange and shallow blades curved forward in direction of airflow. Mechanically attached to shaft with set screws.

        5. Blower performance shall be factory tested for flow rate, pressure, power, air density, rotation speed and efficiency. Ratings are to be established in accordance with AMCA 210, “Laboratory Methods of Testing Fans for Rating”.


  1. General: Blower motors greater than ¾ horsepower shall be “NEMA Premium™” unless otherwise indicated. Compliance with EPAct minimum energy-efficiency standards for single speed ODP and TE enclosures is not acceptable. Motors shall be heavy-duty, permanently lubricated type to match the fan load and furnished at the specified voltage, phase and enclosure. Drives shall be sized for a minimum of 150% of driven horsepower and pulleys shall be fully machined cast-type, keyed and fully secured to the fan wheel and motor shafts. Electric motors of ten horsepower or less shall be supplied with an adjustable drive pulley. Comply with requirements in Division 23 05 13, matched with fan load.

  2. Motors shall be Select one [60 cycle, 1 phase 208 volts] [60 cycle, 1 phase 230 volts] [60 cycle, 3 phase 208 volts] [60 cycle, 3 phase 230 volts] [60 cycles, 3 phase 460 volt] [60 cycle, 3 phase 575 volts]. The designation “NEMA Premium™” applies to electric motors with efficiencies that are “better than EPAct.” The terms “high efficiency” or “premium efficiency” have no industry definitions. An excellent explanation of motor efficiencies and designations can be found at:


  1. The unit shall be constructed so that it can function as a stand-alone heating and cooling system controlled by factory-supplied controllers, thermostats and sensors or it can be operated as a heating and cooling system controlled by a Building Management System (BMS). [This unit shall be controlled by a factory-installed microprocessor programmable controller (DDC) that is connected to various optional sensors]. Note: if unit is to be connected to a BMS, a factory-installed DDC controller is required. If there is no BMS, either a DDC controller, a remote panel or controls by others must be specified. If a remote panel is specified, make certain that any needed control switches are included in the remote panel.

  2. [Unit shall incorporate a DDC controller with integral LCD screen that provides text readouts of status, operating settings and alarm conditions. DDC controller shall have a built-in keypad to permit operator to access read-out screens and change settings without the use of ancillary equipment, devices or software. DDC controllers that require the use of equipment or software that is not factory-installed in the unit are not acceptable. Alarm readouts consisting of flashing light codes are not acceptable]. Note: some manufacturers are known to incorporate DDC controllers that require the use of separately-purchased handheld hardware or a PC and/or software to view or change settings. Owner-specified ventilating conditions can be input by means of pushbuttons.

  3. Operating protocol: The DDC shall be factory-programmed for [LonWorks] [BACnet MSTP] [BACnet IP] [Modbus RTU] [Modbus IP]. Specify protocol.

  4. [Variable Frequency Drive (VFD): Unit shall have factory installed variable frequency drives for modulation of the blower motors The VFDs shall be factory-programmed for unit-specific requirements and shall not require additional field programming to operate].

  5. [Remote Interface: Contractor shall provide and install a Remote Interface that functions as a remote indicator of owner-selected operating parameters and also permits remote inputting of new operating parameters. Each remote panel shall have a large LCD user interface screen similar in form and function to the screen on the DDC. Installed location of room display shall be as indicated on the plans]. Note: only one remote interface per unit is available. See illustration on Addendum A.

  6. [Dehumidistat: Factory shall provide and contractor shall install a dehumidistat as indicated on the plans].

  7. Sensors

      1. [Room / Space Temperature Sensors]

      2. [Dirty Filter Sensor]

      3. [CO2 Sensor]

      4. [Temperature Sensors- [OAI], [EAW], [RAI], [OAAW], [OAD], [ACC]]

      5. [Pressure Sensor- [OAW-P], [OAF-P], [EW-P], [EW-F]]

      6. [Current Sensor- [OAF-A], [EF-A]]

      7. [Rotation Sensor]


  1. [Unit shall have permanent metal filters located in the outdoor air intake and shall be accessible from the exterior of the unit]. [MERV 8] [Combination of MERV 8 and MERV 13] disposable pleated filters shall be provided in the intake air stream and MERV 8 filters in the exhaust air stream]. Note: 2” thick MERV 8 filters are standard.



        1. Prior to start of installation, examine area and conditions to verify correct location for compliance with installation tolerances and other conditions affecting unit performance. See unit IOM.

        2. Examine roughing-in of plumbing, electrical and HVAC services to verify actual location and compliance with unit requirements. See unit IOM.

        3. Proceed with installation only after all unsatisfactory conditions have been corrected.


  1. Installation shall be accomplished in accordance with these written specifications, project drawings, manufacturer’s installation instructions as documented in manufacturer’s IOM, Best Practices and all applicable building codes.


  1. In all cases, industry Best Practices shall be incorporated. Connections are to be made subject to the installation requirements shown above.

  1. Piping installation requirements are specified in Division 22 (Plumbing). Drawings indicate general arrangement of piping, fittings and specialties.

  2. Duct installation and connection requirements are specified in Division 23 of this document.

  3. Electrical installation requirements are specified in Division 26 of this document.


  1. Manufacturer’s Field Service: Engage a factory authorized service representative to inspect field assembled components and equipment installation, to include electrical and piping connections. Report results to A/E in writing. Inspection must include a complete startup checklist to include (as a minimum) the following: Completed Start-Up Checklists as found in manufacturer’s IOM. Insert any other requirements here.


  1. Engage a factory authorized service representative to perform startup service. Clean entire unit, comb coil fins as necessary, and install clean filters. [Verify water source for compliance with manufacturer’s requirements for flow and temperature]. Measure and record electrical values for voltage and amperage. Refer to Division 23 “Testing, Adjusting and Balancing” and comply with provisions therein.


  1. Engage a factory authorized service representative to train owner’s maintenance personnel to adjust, operate and maintain the entire unit. Refer to Division 01 Section Closeout Procedures and Demonstration and Training.


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