Greenheck ERH-90 - Manual - manualsarea.com

Page 3 - INSTALLATION; See page 6 for more detail on appropriate clearances.; LIFTING; THE USE OF ALL LIFTING LUGS IS; Lifting should only be done with all; UNIT WEIGHTS; BASIC OPERATION; Model; Dimensions shown are in inches.; FIGURE 2

3 INSTALLATION The system design and installation should follow accepted industrypractice, such as described in the ASHRAE Handbook. Adequate space should be left around the unit for piping coils anddrains, filter replacement, and maintenance. Sufficient space shouldbe provided on the side of the un...

Page 4 - DUCT WORK CONNECTIONS; ROOF CURB MOUNTING

4 R o tat ion Length of Straight Duct GOOD R o tat ion POOR FIGURE 4 DUCT WORK CONNECTIONS Examples of good and poor fan-to-duct connections are shown below (See FIGURE 4). Airflow out of the fanshould be directed straight or curve the same direction as the fan wheel rotates. Poor duct installation ...

Page 5 - WEATHERHOODS; Air Fan; TYPICAL CONTROL CENTER COMPONENTS; FIGURE 5

5 MainDisconnect On Off Exhaust Hood Control Center Intake Hood INSTALLATION (continued) WEATHERHOODS Supply weatherhood will be factory mounted. The exhaust weatherhood is shipped separately as a kit with itsown instructions. EXHAUST DAMPERS Backdraft dampers for exhaust discharge are mounted in th...

Page 6 - SERVICE CLEARANCES / ACCESS PANEL LOCATIONS for Model ERH; refer to FIGURES 6 and 7 below for these dimensions.; FIGURE 6; TOP VIEW; FIGURE 7

Wheel Cassette 2 in. filters 2 in. filters Exhaust Air Intake Electrical Box Access Panel Access Panel Access Panel Access Panel Access Panel Cassette Slides Out 52 in. Clearance with IG Heater 0 in. Clearance without IG Heater Exhaust Hood Outdoor Air Hood IG Heater *48 in. **64 in. 36 in. 36 in. T...

Page 7 - WATER COIL LOCATION AND CONNECTION; NPT; TABLE 5; FIGURE 8

1. Piping should be in accordance with accepted industry standards. Pipework should be supportedindependently of the coils. Water connections aremale NPT iron pipe. When installing couplings, donot apply undue stress to the connectionextending through the unit. Use a backup pipewrench to avoid break...

Page 8 - ELECTRIC HEATER APPLICATION/OPERATION; ELECTRICAL CONNECTIONS; Electric Preheater

8 ELECTRIC HEATER APPLICATION/OPERATION Factory installed electric heaters can be provided for preheat and/or post-heat (see FIGURE 11). An electricpreheater warms the outdoor air prior to the energy recovery wheel to prevent frosting on the wheel. An electricpost-heater warms the air leaving the en...

Page 9 - Timer Scale; minor field adjustments

FROST CONTROL APPLICATION/OPERATION DIRTY FILTER SWITCH SETUP When outdoor air temperatures are extremely cold, moisture condensation and frosting on the energy recoverywheel is possible. Frost control is an optional feature that will prevent wheel frosting. Two options are available: 1) Timed Exhau...

Page 10 - Testing; ECONOMIZER APPLICATION/OPERATION

The energy recovery wheel may be de-energized for the purpose of providing economizer (free cooling)operation. This can be achieved with a signal from a Temperature or Enthalpy sensor mounted in the supply airinlet compartment (see FIGURE 13). This Primary sensor will de-energize the energy wheel wh...

Page 11 - the “Trouble Shooting” section of this manual if a problem develops.; START UP CHECKS; THEY PREVENT THE ENTRY OF FOREIGN OBJECTS SUCH AS LEAVES, BIRDS, ETC.; Disconnect and lock-out all power switches to fan.; Special Tools Required

11 GENERAL Check all fasteners and set screws for tightness. This is especially importantfor bearings and fan wheels. Also, if dampers are not motorized, check thatthey open and close without binding. FAN WHEEL ROTATION Hand rotate the blower to ensure that the wheel is not rubbing against thescroll...

Page 12 - Leak test thermal system to insure tight connections.; FAN RPM; Do not operate units with access doors/panels

12 ENERGY RECOVERY WHEEL CAUTION: See **WARNING** on page 1 and 11 For the ERH-20 and ERH-45, open the access door marked"Energy Wheel Cassette Access". UNPLUG the wheel drivemotor and remove the metal spacer. Then pull the cassetteout halfway as seen in FIGURE 17. Note: For the ERH-55 and E...

Page 13 - ROUTINE MAINTENANCE; FAN BELTS; MOTORS

13 ROUTINE MAINTENANCE CAUTION: See **WARNING** on Page 1 and 11 Once the unit has been put into operation, a periodic maintenance program should be set up to preserve thereliability and performance. Items to be included in this program are: • BELTS • MOTORS • WHEEL AND FASTENERS • VIBRATION • FILTE...

Page 14 - Internal; VIBRATION; TABLE 7

14 EXTERNAL FILTER MAINTENANCE Aluminum mesh 2 in. filters are located in thesupply weatherhood (if the weatherhood optionwas purchased). Filters should be checked andcleaned on a regular basis for best efficiency. Thefrequency of cleaning depends upon thecleanliness of the incoming air. To remove t...

Page 15 - WATER COIL MAINTENANCE; FILTERS; TEST THE SPRAY PRESSURE; over a small corner of the coil to determine if the fins

15 WATER COIL MAINTENANCE CAUTION: See **WARNING** on Page 1 and 11 FILTERS Filters upstream of the coil should be checked regularly. If the filters are dirty, they should be cleaned orreplaced. It is important that the coils stay clean to maintain desired airflow. See page 14 for more informationon...

Page 16 - ACCESSING ENERGY RECOVERY WHEEL; ROUTINE ENERGY RECOVERY WHEEL MAINTENANCE; MAINTENANCE OF THE ENERGY RECOVERY WHEEL

FIGURE 20 For the ERH-20 and ERH-45, open the access door marked "Energy Wheel Cassette Access" (FIGURE 20).UNPLUG the wheel drive motor and remove the metal spacer. Then pull the cassette out halfway (FIGURE 21). The energy recovery wheel cassettes for model ERH-55 and ERH-90 do not slide o...

Page 17 - REMOVING THE ENERGY RECOVERY WHEEL SEGMENTS

CLEANING ENERGY RECOVERY WHEEL SEGMENTS If the wheel appears excessively dirty, it should be cleaned to ensure maximum operating efficiency. Onlyexcessive buildup of foreign material needs to be removed. DISCOLORATION AND STAINING OF ENERGY RECOVERY WHEEL DOES NOT AFFECT ITS PERFORMANCE. Thoroughly ...

Page 18 - Energy recovery wheel cassette

PARTS LIST 1 2 3 4 8 5 6 7 7 9 Model ERH (shown with indirect gas heater) 10 18 1. Supply blower- Forward curved fan- Adjustable motor mount for belt tensioning- Adjustable sheaves for speed control 2. Vibrations isolators (quantity 4 per blower) - Neoprene 3. Energy recovery wheel cassette 4. Remov...

Page 19 - Trouble Shooting

* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating. 19 Control power (24 Vac) wiringrun is too long (resistanceshould not exceed 0.75 ohms). Shorten wiring run to mechanical room or install a relay...

Page 20 - IOM ERH FS; Warranty; GREENHECK; Possible Cause

IOM ERH FS Rev. 1 January 2002 Warranty Greenheck warrants this equipment to be free from defects in material and workmanship for a period of one year fromthe purchase date. The energy recovery wheel is warranted to be free from defects in material and workmanship for aperiod of five years from the ...

Greenheck ERH-90 - Manual

Table of Contents:

Summary

Other Greenheck Models