Page 2 - • Energize fan motor once every three months; BASIC OPERATION; Outdoor Air
2 TABLE OF CONTENTS Storage and Basic Operation . . . . . . . . . . . . . . 2 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Lifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Unit Weights & Recommended Roof Openings . . . . . . . . . . . . . ...
Page 3 - INSTALLATION; LIFTING; Unit Size; SAFETY WARNING; All factory provided lifting lugs must
3 INSTALLATION The system design and installation should follow accepted industry practice, such as described in the ASHRAE Handbook . Adequate space should be left around the unit for piping coils and drains, filter replacement, and maintenance . Sufficient space should be provided on the side of t...
Page 4 - Curb Outside Dimensions; All dimensions shown are in inches .; ROOF CURB MOUNTING
4 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 GKD, which are shipped in a knockdown kit (includes duct adapter) and require field assembly (by ...
Page 5 - DUCTWORK CONNECTIONS; Rail Layout; Isometric view of HRE on rails; Dimensions shown are in inches .; Supply weatherhood will be factory mounted .
5 1 Fan Wheel Dia. 1 Fan Wheel Dia. Rot atio n Rot atio n R o tati on R o tati on Length of Straight Duct GOOD POOR GOOD POOR GOOD POOR Tu rning Vanes Tu rning Vanes SYSTEM EFFECT FACTOR CURVES FPM X 100 OUTLET VELOCITY 0 5 10 15 20 25 30 35 40 45 1.2 1.0 0.8 0.6 0.4 0.2 0.0 S TA TIC PRESSURE LOSS C...
Page 6 - To prevent injury or death due to electrocution or; WARNING; For units with a gas furnace, if you turn off the; Field Control Wiring Length/Gauge; Total Wire Length
6 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 ...
Page 7 - TYPICAL CONTROL CENTER COMPONENTS
7 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 . Fuses for blower motors 8 . Motor Contactor - Indirect Evap Pump 9 . Motor Contactor -...
Page 8 - SERVICE CLEARANCES / ACCESS PANEL LOCATIONS; refer to drawings below for these dimensions.; TOP VIEW
8 Wheel Cassett e 2 in. filters 2 in. filters Direct Evap Section Exhaust Air Intake Electrical Box Access Panel Access Panel Access Panel Access Panel Access Panel Cassette Slides Ou t 52 in. Clearance with IG Heater 0 in. Clearance without IG Heater Exhaust Hood Outdoor Air Hood IG Heater *48 in. ...
Page 9 - DIMENSIONAL DATA / ACCESS DOOR DESCRIPTIONS; Outdoor air filters
9 DIMENSIONAL DATA / ACCESS DOOR DESCRIPTIONS Following is a list of items accessible through the access doors shown on the diagram at the right . Some items are optional and may not have been provided . 1) Exhaust blower, motor, and drives2) Aluminum mesh filters (intake hood)3) Energy recovery whe...
Page 10 - Note: Evaporative media may foam for a short period; EVAP MODULE INSTALLATION; EVAPORATIVE COOLING MODULES; Indirect Evaporative Cooler
10 1 . After the energy recovery unit is set in place, run the overflow and drain lines to the exterior fittings on the evaporative cooler (drain & overflow connections at unit are 1-inch male pipe thread) . The supply line can be attached at the downstream side of the evaporative cooler . A man...
Page 11 - HRE WATER SUPPLY CONNECTION LOCATION; OA INLET; Model; Top View
11 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...
Page 12 - AUTO DRAIN AND FILL WITH FREEZE PROTECTION; WATER CONTROL OPTIONS FOR EVAPORATIVE COOLING
12 Evaporative Timer Evaporative Freeze Protection t2 settings t1 settings Temperature Setting AUTO DRAIN AND FILL WITH FREEZE PROTECTION This system will automatically drain the sump tank and fill it with fresh water at the field adjustable intervals, typically once every 24 hours . This flushes mi...
Page 13 - DRAIN TRAP
13 Cooling coils are provided with a stainless steel drain pan with 3/4-in. female NPT drain connection. A drain trap must be connected to the drain connection to allow excess water to flow out of the drain pan . More importantly, though, due to the negative internal static of the cooling coil compa...
Page 14 - DRAIN AND OVERFLOW CONNECTION LOCATIONS; Exhaust
14 DRAIN AND OVERFLOW CONNECTION LOCATIONS Model Connection Locations - in inches Outdoor Air Side Exhaust Side A B C D A B C D 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 56 .50 58 .00 HRE-55 6 .375 5 .125 53 .00 54 .50 6 .375 5 .125...
Page 15 - Symptom Solution; Insufficient water; TROUBLESHOOTING FOR EVAPORATIVE MODULE
15 Symptom Solution Leaving Air Entering Air 45 ° 15 ° Insufficient water volume or recirculation pump not operating Irregular water distribution on cooling media Scale and mineral deposit formation on face of media Excessive water discharge into drain Water Carry-Over Poor performance after cooling...
Page 16 - EVAPORATIVE COOLING MAINTENANCE; IMPORTANT; Replacement media should be from the same
16 Regularly scheduled maintenance is the key to peak performance, minimized cost, and extended life of the evaporative cooler . The following is a checklist of items that need to be looked at on a regular basis . 1 . The media should be checked for mineral and foreign material deposits that have bu...
Page 17 - OPTIONAL ACCESSORIES
17 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 recove...
Page 18 - Frost Control Application/Operation; • Jumper the pressure switch. Set the Timer Scale for T1 and T2 to; Frost Threshold Temp
18 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 2) Elec...
Page 19 - Economizer Application/Operation
19 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 fro...
Page 20 - Variable Frequency Drives for Blowers; ESC
20 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) . The VFDs provided are either Yaskaw...
Page 21 - S1 to SN contact for On/Off; Yaskawa E7 Drive
21 S1 to SN contact for On/OffA1 (0-10VDC) referenced to AC (Can use +15 VDC from +V) Parameter Setting A1-01 Access Level 2 C6-02 Carrier frequency 2 d2-02 Ref Lower Limit 50% E2-01 Motor Rated FLA Motor FLA H3-03 Terminal A1 Bias 50% O2-03 User Defaults 1 A1-01 Access Level 0 S1 to SC contact for ...
Page 22 - Wiring Diagram
22 FACTORY SUPPLIED AND WIRED G MULTI-VOLTAGE PRIMARY 24 SECONDARY TR1 C FU5 TO UNIT MAIN POWER L3 L2 L1 DS1 SUPPLY DAMPER D2 ENERGY WHEEL R1 R TR1 SO SR 3 FR FC 2-10V - + 1 TR 5 4 2 SR+ RETURN AIR SENSOR MIXED AIR SENSOR T T1 620 OHM RESISTOR OR OUTDOOR AIR SENSOR SO+ 4 S1 VFD-W L3 3 4 SC L2 L1 MC ...
Page 23 - minor field adjustments; Negative pressure connection is toward the “back or bottom”
23 Rotation Sensor Dirty Filter 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 & 12 in the unit control cente...
Page 24 - Vapor Tight Lights; Service Outlet
24 Vapor Tight Lights Vapor tight lights provide light to each of the compartments in the energy recovery unit . The lights are wired to a switch mounted on the outside of the unit . The switch requires a separate power source to allow for power to the lights when the unit main disconnect is off for...
Page 25 - The remote panel is available with the following options:; Remote Control Panel and Wiring Schematics
25 OPTIONAL ACCESSORIES 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...
Page 26 - Supply Dirty Filter; Remote Panel Wiring Schematics
26 W1 12 7 6 Y2 Y1 G C R NC C NC C NO NO Indicator Lights powered by the ER Unit Unit On/Off Frost ControlEconomizerRotation Sensor Supply Dirty Filter Exhaust Dirty Filter PS2 PS3 NC NC NO C NO C Dirty Filter Indicator(Power by Others) Supply Dirty Filter Exhaust Dirty Filter PS2 PS3 HotL1 Refer to...
Page 28 - ENERGY WHEEL; Sensors Mounted by Factory; Temperature Sensors - 1K Ohm RTD
28 OPTIONAL ACCESSORIES RAI RAF-P RA FILTER OAAW COOL COIL ACC HEAT COIL OAF-A OAD SUPPLY BLOWER TO INSIDE FROM INSIDE EW-P OAW-P ENERGY WHEEL EAW EF-A OAI OA FILTER OAF-P TO OUTSIDE FROM OUSTIDE EXHAUST BLOWER Sensors Mounted by Factory Factory mounted temperature, pressure, and current sensors are...
Page 29 - START-UP CHECKLIST FOR UNIT; Unit Model Number; Pre-Start Up Checklist; check boxes as items are completed
29 START-UP CHECKLIST FOR UNIT Unit Model Number ____________________________ (e .g . HRE-55) Unit Serial Number ____________________________ (e .g . 04C99999) Energy Wheel Date Code ____________________________ (e .g . 0450) Start-up date ____________________________ (MM/DD/YYYY) Start-up Personnel...
Page 30 - Special Tools Required; START-UP CHECKLIST FOR EVAPORATIVE COOLER
30 Line Voltage - check at unit disconnect L1-L2 ________ Volts L2-L3 ________ Volts L1-L3 _______ Volts Motor Amp Draw: Supply Motor Amps L1 ________ Amps L2 ________ Amps L3 ________ Amps Exhaust Motor Amps L1 ________ Amps L2 ________ Amps L3 ________ Amps Fan RPM: Supply Fan RPM _____________ Ex...
Page 31 - OPTIONAL ACCESSORIES CHECKLIST
31 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 Fact...
Page 32 - Fan Performance Modifications; When operating conditions of the fan are to be; Refer to Parts List section for component locations.; Belt Drive Installation; Proper alignment of motor and drive shaft.; Fan Belt Drives
32 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 . Be sure to check the belt dri...
Page 33 - Vibration; Rotation Direction; Direction of Fan Wheel Rotation; Check for unusual noise,; Fan RPM; Do not operate units with access
33 Vibration Excessive vibration may be experienced during initial start-up . Left unchecked, excessive vibration can cause a multitude of problems, including structural and/or component failure . The most common sources of vibration are listed below . Many of these conditions can be discovered by c...
Page 34 - To adjust the air seals,
34 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 a...
Page 35 - ROUTINE MAINTENANCE; DATE DATE DATE DATE
35 Once the unit has been put into operation, a routine maintenance program should be set up to preserve reliability and performance. Items to be included in this program are: SAFETY CAUTION! Use caution when removing access panels or other unit components, especially while standing on a ladder or o...
Page 36 - Proper fan belt settings; -inch for each inch of belt span; Fan Belts
36 ROUTINE MAINTENANCE Proper fan belt settings Belt Span Deflection = Belt Span 64 The proper belt setting is the lowest tension at which the belts will not slip under peak load operation . For initial tensioning, set the belt deflection at 1 / 64 -inch for each inch of belt span (measured half-way...
Page 37 - filter replacements are Aerostar Series 400 or Farr 30/30; Door Seal Maintenance; Outdoor air intake hood; Filter Size and Quantities; Bearings
37 External Filter Maintenance Aluminum mesh, 2-inch deep filters are located in the supply weatherhood (if the weatherhood option was purchased) . Filters should be checked and cleaned on a regular basis for best efficiency . The frequency of cleaning depends upon the cleanliness of the incoming ai...
Page 38 - Energy Recovery Wheel Maintenance; REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS
38 Access to wheel through outdoor air filter door The HRE units have one energy recovery wheel . Open the outdoor air filter door to access the wheel . For the HRE-20 and HRE-45 models, the wheel cassette slides out . Due to the size and weight of the HRE-55 and HRE-90 wheels, they remain stationar...
Page 39 - Wheel Bearing
39 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...
Page 41 - SEQUENCE OF OPERATION
41 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 . The HRE units can be supplied with or without heating and ...
Page 42 - Test and Balance Report; accordance with SMACNA and AMCA guidelines.; Troubleshooting Airflow
42 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 . As such, if ...
Page 43 - Possible Cause; Troubleshooting
43 * Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating. Control power (24 Vac) wiring run is too long (resistance should not exceed 0 .75 ohms) . Shorten wiring run to mechanical room or install a r...
Page 44 - Does NOT Turn; No power to wheel motor.; Warranty
*Always provide the unit model and serial number when requesting parts or service information. *Always check motor amps and compare to nameplate rating. Energy Wheel Does NOT Turn Blower fan motor overloads are tripping and auto-resetting . Decrease fan speed . Possible Cause Symptom Corrective Acti...
