Instruction/ maintenance manual of the product ERH-20 Greenheck Fan
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**W ARNING** DISCONNECT AND SECURE TO THE "OFF" POSITION ALL ELECTRICAL POWER TO THE UNITS PRIOR TO INSPECTION OR SERVICING. F AILURE TO COMPL Y WITH THIS SAFETY PRECAUTION COULD RESUL T IN SERIOUS INJUR Y OR DEA TH. **IMPORT ANT** ALL F ACTORY PROVIDED LIFTING LUGS MUST BE USED WHEN LIFTING THE UNITS.
GENERAL Greenheck Energy Recovery units with Te mpering are thor oughly inspected and test run at the factory . However , damage may occur during handling and shipping. Consequently , it is important to inspect the unit for visible and concealed damage before beginning installation.
3 INST ALLA TION 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.
4 R o t a t i o n Length of Straight Duct GOOD R o t a t i o n 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 fan should be directed straight or curve the same dir ection as the fan wheel rotates.
5 Main Disconnect On Off Exhaust Hood Control Center Intake Hood INST ALLA TION (continued) WEA THERHOODS Supply weatherhood will be factory mounted. The exhaust weatherhood is shipped separately as a kit with its own instructions. EXHAUST DAMPERS Backdraft dampers for exhaust discharge are mounted in the unit.
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.
1. Piping should be in accordance with accepted industry standards. Pipework should be supported independently of the coils. W ater connections are male NPT iron pipe. When installing couplings, do not apply undue stress to the connection extending through the unit.
8 ELECTRIC HEA TER APPLICA TION/OPERA TION Factory installed electric heaters can be provided for pr eheat and/or post-heat (see FIGURE 11). An electric preheater warms the outdoor air prior to the energy r ecovery wheel to prevent fr osting on the wheel.
FROST CONTROL APPLICA TION/OPERA TION DIRTY FIL TER SWITCH SETUP When outdoor air temperatures ar e extremely cold, moistur e condensation and frosting on the energy recovery wheel is possible. Frost contr ol is an optional feature that will pr event wheel frosting.
The energy recovery wheel may be de-energized for the purpose of pr oviding economizer (free cooling) operation. This can be achieved with a signal from a T emperature or Enthalpy sensor mounted in the supply air inlet compartment (see FIGURE 13).
11 GENERAL Check all fasteners and set screws for tightness. This is especially important for bearings and fan wheels. Also, if dampers are not motorized, check that they open and close without binding. F AN WHEEL ROT A TION Hand rotate the blower to ensur e that the wheel is not rubbing against the scroll.
12 ENERGY RECOVERY WHEEL CAUTION: See **W ARNING** on page 1 and 11 For the ERH-20 and ERH-45, open the access door marked "Energy Wheel Cassette Access". UNPLUG the wheel drive motor and remove the metal spacer . Then pull the cassette out halfway as seen in FIGURE 17.
13 ROUTINE MAINTENANCE CAUTION: See **W ARNING** on Page 1 and 11 Once the unit has been put into operation, a periodic maintenance program should be set up to pr eserve the r eliability and performance.
14 EXTERNAL FIL TER MAINTENANCE Aluminum mesh 2 in. 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 ef ficiency . The frequency of cleaning depends upon the cleanliness of the incoming air .
15 WA TER COIL MAINTENANCE CAUTION: See **W ARNING** on Page 1 and 11 FIL TERS Filters upstream of the coil should be checked r egularly . If the filters ar e dirty , they should be cleaned or r eplaced. It is important that the coils stay clean to maintain desir ed airflow .
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 out due to their size and weight.
CLEANING ENERGY RECOVERY WHEEL SEGMENTS If the wheel appears excessively dirty , it should be cleaned to ensur e maximum operating efficiency . Only excessive buildup of foreign material needs to be r emoved. DISCOLORA TION AND ST AINING OF ENERGY RECOVERY WHEEL DOES NOT AFFECT ITS PERFORMANCE.
PA R TS 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.
* Always provide the unit model and serial number when requesting parts or service information. * Always check motor amps and compare to nameplate rating.
IOM ERH FS Rev . 1 January 2002 W arranty Greenheck warrants this equipment to be fr ee from defects in material and workmanship for a period of one year from the purchase date. The energy r ecovery wheel is warranted to be free from defects in material and workmanship for a period of five years from the pur chase date.
An important point after buying a device Greenheck Fan ERH-20 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Greenheck Fan ERH-20 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Greenheck Fan ERH-20 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Greenheck Fan ERH-20 you will learn all the available features of the product, as well as information on its operation. The information that you get Greenheck Fan ERH-20 will certainly help you make a decision on the purchase.
If you already are a holder of Greenheck Fan ERH-20, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Greenheck Fan ERH-20.
However, one of the most important roles played by the user manual is to help in solving problems with Greenheck Fan ERH-20. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Greenheck Fan ERH-20 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
