Greenheck HRE-20 Installation, operationand Maintenance Manual
  1. Manuals
  2. Brands
  3. Greenheck Manuals
  4. Air Conditioner
  5. HRE-20
  6. Maintenance manual
Greenheck HRE-20 Installation, operationand Maintenance Manual

Greenheck HRE-20 Installation, operationand Maintenance Manual

Heat recovery unit with evaporative cooling
Hide thumbs Also See for HRE-20 Installation, operationand:
Table of Contents

Advertisement

Quick Links

Download this manual See also: Installation, Operation & Maintenance Manual
®
INSTALLATION, OPERATION AND MAINTENANCE
The HRE is thoroughly inspected and test run at the factory. However, damage may occur during
shipping and handling. Upon delivery, inspect the unit for both obvious and hidden damage.
If damage is found, record all necessary information on the bill of lading and file a claim with
the final carrier. In addition, ensure all accessory items are present. Some accessory items are
Improper installation, adjustment, alteration, service or maintenance can cause property
damage, injury or death. Read this installation, operation, and maintenance manual thoroughly
before installing or servicing this equipment. Installation and service must be performed by a
INSTALLATION SUPPLEMENT
Refer to the following
installation supplement for
HRE units when supplied with
Indirect Gas (IG) heating:
Model PVF, Indirect Gas
Fired Furnaces for Energy
Recovery Units, Part #461006
SAVE THIS MANUAL
This manual is the property
of the owner, and is required
for future maintenance. This
manual should remain with
each HRE unit when the job
is complete.
READ AND SAVE THESE INSTRUCTIONS
MANUAL
RECEIVING AND HANDLING
stored inside the unit during shipping.
SAFETY WARNING
qualified installer, service agency, or the gas supplier.
HEAT RECOVERY UNIT
WITH EVAPORATIVE COOLING
Models:
Indirect Evaporative Cooler
(Exhaust/Scavenger Airstream)
Direct Evaporative Cooler
PART #461248
HRE-20, 45, 55, & 90
(Outdoor/Supply Airstream)

Advertisement

Table of Contents
loading

Related Manuals for Greenheck HRE-20 Installation, operationand

Summary of Contents for Greenheck HRE-20 Installation, operationand

  • Page 1 READ AND SAVE THESE INSTRUCTIONS PART #461248 HEAT RECOVERY UNIT WITH EVAPORATIVE COOLING ® Models: HRE-20, 45, 55, & 90 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RECEIVING AND HANDLING The HRE is thoroughly inspected and test run at the factory. However, damage may occur during shipping and handling.

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Storage and Basic Operation . . . . . . . . . . . . . . 2 Typical Wiring Diagram . . . . . . . . . . . . . . . . . . 22 Installation .

  • Page 3: Installation

    INSTALLATION The system design and installation should follow accepted industry practice, such as described in the SAFETY WARNING ASHRAE Handbook . All factory provided lifting lugs must Adequate space should be left around the unit for piping be used when lifting the units . Failure coils and drains, filter replacement, and maintenance .

  • Page 4: Roof Curb Mounting

    ROOF CURB MOUNTING 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 . Roof curb details, including duct location 1. Factory Supplied Roof Curbs dimensions, are available on HRE roof curb Roof curbs are Model GKD, which are shipped in a assembly instructions.

  • Page 5: Rail Mounting

    RAIL MOUNTING Rail Layout • Rails designed to handle the weight of the HRE should be positioned as shown on the diagram (rails by others) . • Make sure that rail positioning does not interfere with the supply air discharge opening or the exhaust air intake opening on the HRE unit . Avoid area dimensioned “B” below • Rails should run the width of the unit and extend beyond the unit a minimum of 12 inches on each side . T u rning Vanes • Set unit on rails.

  • Page 6: Electrical Information

    ELECTRICAL INFORMATION The unit must be electrically grounded in accordance with the current National Electrical Code, ANSI/NFPA No. 70. In Canada, use current C.S.A. Standard C22.1, Canadian Electrical Code, Part 1. In addition, the installer should be aware of any local ordinances or electrical company requirements that might apply . System power wiring must be properly fused and conform to the local and national electrical codes . System power wiring is to the unit main disconnect (door interlocking disconnect switch standard on most units) or distribution block and must be compatible with the ratings on the nameplate: supply power voltage, phase, and amperage (Minimum Circuit Amps - MCA, Maximum Overcurrent Protection - MOP) .
  • Page 7 TYPICAL CONTROL CENTER COMPONENTS 1 . Main Disconnect (non-fusible, lockable) 2 . Motor Starter - Exhaust Air Fan 3 . Motor Starter - Outdoor Air Fan 4 . Motor Contactor - Energy Wheel 5 . 24 VAC Control Transformer 6 . 24 VAC Terminal strip 7 .

  • Page 8: Service Clearances

    SERVICE CLEARANCES / ACCESS PANEL LOCATIONS HRE-20, 45, 55, and 90 units require minimum clearances for access on all sides for routine maintenance . Filter replacement, drain pan inspection and cleaning, energy wheel cassette inspection, fan bearing lubrication and belt adjustment, are examples of routine maintenance that must be performed . Blower and motor assemblies, energy recovery wheel cassette, coil and filter sections are always provided with a service door or panel for proper component access .

  • Page 9: Dimensional Data/Access Door Description

    DIMENSIONAL DATA / ACCESS DOOR DESCRIPTIONS Exterior Dimensions Model HRE-20 28 .5 14 .25 HRE-45 23 .375 10 .5 13 .375 HRE-55 59 .5 5 .875 7 .125 21 .25 HRE-90 2 .875 24 .5 All dimensions shown are in inches . Overall Exterior Dimensions Model Width...

  • Page 10: Evaporative Cooling Modules

    EVAPORATIVE COOLING MODULES Indirect Evaporative Cooler Mount the heat recovery unit level to ensure proper (Exhaust/Scavenger Airstream) operation and water drainage . Piping should be of adequate size to provide sufficient supply of water to meet the maximum demand of the evaporative coolers . EVAP MODULE INSTALLATION 1 .

  • Page 11: Water Supply Connection Location

    7 . Verify that both airflow and system static pressure are in agreement with the specifications . If these conditions are met, check for water carry over from the discharge side of the media . If carry over is observed, check the distribution header for holes or tears and the water standoff tube for blockage . 8 .

  • Page 12: Water Control Options

    WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING AUTO DRAIN AND FILL WITH FREEZE PROTECTION THE SYSTEM WILL AUTOMATICALLY DRAIN THE SUMP TANK AND FILL IT WITH FRESH WATER AT THE FIELD ADJUSTABLE INTERVALS, TYPICAL SETTINGS ARE t1 = 24HRS t2 = 10 MIN. WITH THE DIP SWITCH IN THE DOWN POSITION. THIS FLUSHES MINERAL BUILD-UP AND DEBRIS FROM THE TANK TO PROMOTE LOW MAINTENANCE AND AUTO DRAIN AND FILL WITH FREEZE PROTECTION INCREASE MEDIA PAD LIFE.
  • Page 13 INCREASE MEDIA PAD LIFE. IN ADDITION, THE SYSTEM WILL PROTECT THE EVAPORATIVE COOLER FROM FREEZING BY DRAINING THE SUMP TANK AND SUPPLY LINE WHEN THE OUTSIDE TEMPERATURES FALL BELOW THE SET POINT OF THE OUTDOOR AIR SENSOR. TYPICALLY, THIS IS SET AT 45° TO 50° F. THE AUTO DRAIN AND FILL OUTDOOR AIR SENSOR SHOULD BE INSTALLED IN AN AREA THAT IS SHADED FROM DIRECT SUNLIGHT SO THE SENSOR PROBE WILL DETECT AN ACCURATE AIR TEMPERATURE.

  • Page 14: Drain & Overflow Connection Locations

    DRAIN AND OVERFLOW CONNECTION LOCATIONS Connection Locations - in inches Model Outdoor Air Side Exhaust Side HRE-20 4 .00 2 .875 40 .75 42 .25 4 .00 2 .875 52 .25 53 .75 HRE-45 6 .25 5 .125 42 .625 44 .125 6 .25 5 .125...

  • Page 15: Troubleshooting

    TROUBLESHOOTING FOR EVAPORATIVE MODULE Symptom Solution Insufficient water A . Check water level in base pan . The volume or recirculation level should be at 1 inch . pump not operating B . Check the pump filter at the inlet . Clean the filter if clogged or dirty .

  • Page 16: Maintenance

    EVAPORATIVE COOLING MAINTENANCE Regularly scheduled maintenance is the key to peak c) Open evaporative cooling section door performance, minimized cost, and extended life of d) Flush distribution headers and media for 20 the evaporative cooler . The following is a checklist of minutes items that need to be looked at on a regular basis .

  • Page 17: Optional Accessories

    OPTIONAL ACCESSORIES Electric Heater Application/Operation Factory installed electric heaters can be provided for preheat and/or post-heat . An electric preheater warms the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel . An electric post-heater warms the air leaving the energy recovery wheel to a user specified discharge temperature .

  • Page 18: Frost Control Application/Operation

    OPTIONAL ACCESSORIES Frost Control Application/Operation Extremely cold outdoor air temperatures can cause moisture condensation and frosting on the energy recovery wheel. Frost control is an optional feature that will prevent/control wheel frosting. Three options are available: 1) Timed Exhaust frost control Indoor RH @ 70º F Frost Threshold Temp 2) Electric preheat frost control 2º F 3) Modulating wheel frost control 7º...

  • Page 19: Economizer Application/Operation

    OPTIONAL ACCESSORIES Economizer Application/Operation The energy recovery wheel operation can be altered to take advantage of economizer operation (free cooling) . Two modes are available: 1) De-energizing the wheel or 2) Modulating the wheel. A field supplied call for cool (Y1) is required . De-energizing the wheel is accomplished with a signal from a Temperature or Enthalpy sensor mounted in the supply air inlet compartment .
  • Page 20 OPTIONAL ACCESSORIES Variable Frequency Drives for Blowers Optional factory installed, wired, and programmed variable frequency drives (VFD) may have been provided for modulating or multi-speed control of the blowers . One VFD is provided for each blower (outdoor air and exhaust) .

  • Page 21: Variable Frequency Drives

    OPTIONAL ACCESSORIES Factory Setpoints - MODULATING CONTROL (0-10 VDC) FOR FAN SPEED Variable frequency drives (VFD) for the blowers are factory setup to receive a 0-10 VDC signal wired in the field (refer to previous page for terminal locations) . Most of the setpoints in the VFDs are factory defaults . There are a few, though, that are changed at Greenheck and are shown in the tables below .

  • Page 22: Typical Wiring Diagram

    OPTIONAL ACCESSORIES Wiring Diagram Following is an example of a typical wiring diagram located in the unit control center . This wiring diagram includes a legend highlighting which accessories were provided with the unit . Factory wiring and field wiring are also indicated .

  • Page 23: Sensors And Lights

    OPTIONAL ACCESSORIES Rotation Sensor The rotation sensor monitors energy recovery wheel rotation . If the wheel should stop rotating, the sensor will close a set of contacts in the unit control center . Field wiring of a light (or other alarm) between terminals R &...

  • Page 24: Service Outlet

    OPTIONAL ACCESSORIES CO2 Sensor This accessory is often used to provide a modulating control signal to a variable frequency drive to raise and lower airflow in relationship to the CO2 levels in the space . This strategy is often referred to as Demand Control Ventilation and provides further energy savings to the system .

  • Page 25: Remote Control Panel & Wiring

    OPTIONAL ACCESSORIES Remote Control Panel and Wiring Schematics The remote panel is a series of junction boxes ganged together and includes a stainless steel face plate . The remote panel is available with a number of different alarm lights and switches to control the unit . The remote panel ships loose and requires mounting and wiring in the field .
  • Page 26 OPTIONAL ACCESSORIES Remote Panel Wiring Schematics Indicator Lights powered by the ER Unit Unit On/Off Frost Control Economizer Rotation Sensor Supply Dirty Filter Exhaust Dirty Filter Dirty Filter Indicator (Power by Others) Supply Dirty Filter Exhaust Dirty Filter Refer to Pressure Switch for voltage and load ratings .
  • Page 27 OPTIONAL ACCESSORIES Remote Panel Wiring Schematics Heating/Cooling Switches and Night Setback Switch/Timer Unit On/Off Econ/First Stage Cooling Second Stage Cooling Heat Terminal Block in Unit Control Center Night Setback Timer Night Setback Switch...

  • Page 28: Sensors Mounted By Factory

    OPTIONAL ACCESSORIES Sensors Mounted by Factory Factory mounted temperature, pressure, and current sensors are available in the locations indicated on the unit diagram below . A list of available sensors is shown below . The specific sensors provided on a given unit are labeled in the unit control center on the terminal strip .

  • Page 29: Unit

    START-UP CHECKLIST FOR UNIT SAFETY DANGER! SAFETY CAUTION! Electric shock hazard . Can cause injury or death . Use caution when removing access panels or other Before attempting to perform any service or unit components, especially while standing on a maintenance, turn the electrical power to unit to OFF ladder or other potentially unsteady base .

  • Page 30: Start-Up Checklist

    START-UP CHECKLIST FOR UNIT Special Tools Required Voltage Meter (with wire probes) Amperage Meter Incline manometer or equivalent Tachometer Thermometer Start-Up Checklist The unit will be in operational mode during start-up . Use necessary precautions to avoid injury . All data must be collected while the unit is running .

  • Page 31: Optional Accessories

    OPTIONAL ACCESSORIES CHECKLIST Refer to the respective sections in this Installation, Operation and Maintenance Manual for detailed information . Refer to wiring diagram in unit control center to determine what electrical accessories were provided . Provided with Unit? Frost Control Application / Operation section: Setting Factory Default Frost Control Setpoint...

  • Page 32: Fan

    UNIT START-UP Refer to Parts List section for component locations. Fans (Forward Curved Type) The HRE Models contain a forward curved supply fan and a forward curved exhaust fan . These forward curved fans should be checked for free rotation . If any binding occurs, check for concealed damage and foreign objects in the fan housing .
  • Page 33 UNIT START-UP Backward Inclined Direction of Fan Wheel Rotation Blower access is labeled on unit . Check for proper wheel rotation by momentarily energizing the fan . Rotation is determined by viewing the wheel from the drive Airflow Airflow side and should match the rotation decal affixed to the fan housing (see Rotation Direction figures) .

  • Page 34: Energy Recovery Wheel

    UNIT START-UP Energy Recovery Wheel The HRE models contain a sensible energy recovery wheel . The wheels are inspected for proper mechanical operation at the factory . However, during shipping and handling, shifting can occur that may affect wheel operation . The wheel is accessible through the access door marked “Energy Wheel Cassette Access”...

  • Page 35: Routine Maintenance Checklist

    ROUTINE MAINTENANCE SAFETY CAUTION! SAFETY DANGER! Electric shock hazard . Can cause injury or death . Use caution when removing access panels or other unit components, especially while standing on a Before attempting to perform any service or ladder or other potentially unsteady base . Access maintenance, turn the electrical power to unit to OFF panels and unit components can be heavy and at disconnect switch(es) .

  • Page 36: Belts And Motors

    ROUTINE MAINTENANCE Lubrication Check all moving components for proper lubrication . Apply lubrication where required . Any components showing excessive wear should be replaced to maintain the integrity of the unit and ensure proper operation . Dampers Check all dampers to ensure they open and close properly and without binding . Backdraft dampers can be checked by hand to determine if blades open and close freely .

  • Page 37: Bearings, Filters And Door Seal

    ROUTINE MAINTENANCE Bearings Most bearings are permanently lubricated and require not further lubrication under normal use. Normal use being considered -20ºF to 120ºF and in a relatively clean environment . Some bearings are re-lubricatable and will need to be regreased depending on fan use . Check your bearings for grease zert to find out what type of bearing you have .

  • Page 38: Energy Recovery Wheel Maintenance

    ROUTINE MAINTENANCE Energy Recovery Wheel Maintenance Annual inspection of the energy recovery wheel is recommended . Units ventilating smoking lounges and other non-clean air spaces should have energy recovery wheel inspections more often based upon need . Inspections for smoke ventilation applications are recommended bimonthly to quarterly until a regular schedule can be established .

  • Page 39: Cleaning Wheel Segments

    ROUTINE MAINTENANCE CLEANING THE ENERGY RECOVERY WHEEL If the wheel appears excessively dirty, it should be cleaned to ensure maximum operating efficiency . Only excessive buildup of foreign material needs to be removed . DISCOLORATION AND STAINING OF ENERGY RECOVERY WHEEL DOES NOT AFFECT ITS PERFORMANCE. Thoroughly spray wheel matrix with household cleaner such as Fantastic ®...

  • Page 40: Parts List

    PARTS LIST Model HRE (shown with indirect evaporative cooler, optional direct evaporative cooler, and indirect gas heater) 1 . Supply blower 8 . Electrical control box (standard features) - Forward curved fan - Single point power - Adjustable motor mount for belt tensioning - Disconnect interlocked with access door - Adjustable sheaves for speed control - Motor starters for the supply blower, exhaust...

  • Page 41: Sequence Of Operation

    SEQUENCE OF OPERATION Basic Unit The HRE units are pre-wired such that when a call for outside air is made (via field supplied 24 VAC control signal wired to unit control center), the supply fan, exhaust fan and energy wheel are energized and the motorized dampers open .

  • Page 42: Troubleshooting Airflow

    Troubleshooting Airflow Test and Balance Report The test and balance report (TAB) is utilized to determine whether the appropriate amount of outdoor air and exhaust air is being supplied and removed from a building, respectively . There are no set rules on what information must be included in a TAB report .

  • Page 43: Troubleshooting

    Troubleshooting Symptom Possible Cause Corrective Action Blown fuse or open circuit Replace fuse or reset circuit breaker and check amps . breaker . Defective motor or capacitor . Replace . Blower Fails to Motor starter overloaded . Reset starter and check amps . Operate Electrical .

  • Page 44: Warranty

    . As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications without notice . #461248 IOM HRE FS Rev . 4, April 2012 Copyright © 2012 Greenheck Fan Corp .

This manual is also suitable for:

Hre-45Hre-55Hre-90

Table of Contents