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.. .......................................................................................................................... duct length requirements as prescribed in AMCA Publication All dimensions are in inches. Weights are for 12-inch high 201. Calculated values have been rounded up to nearest foot. GPI type curbs. 5Energy Recovery Ventilator Rail Mounting / Layout .. .......................................................................................................................................................................................................... others). .. ...................................................................................................................................................................................................................... intake opening on the ERV unit. Avoid area dimensioned “B” below. .. .............................................................................................................................................. .. .................................. OUTDOOR AIR SIDE ERV-251 ERV-361 ERV-521 ERV-581 Isometric view of ERV on rails ERV-522 ERV-582 Isometric view of ERV on rails OUTDOOR AIR INTAKE END SUPPLY/EXHAUST OPENING OUTDOOR AIR INTAKE HOOD OUTDOOR AIR SIDE OUTDOOR AIR INTAKE END OUTDOOR AIR INTAKE HOOD SUPPLY/EXHAUST OPENING Side view of ERV on rails BA Side view of ERV on rails A B Unit Size A B ERV-251 4.50 16 ERV-361 4.75 18 ERV-521 5.75 24 ERV-581 4.875 22 Unit Size A B ERV-522 4.625 32 ERV-582 4.875 33.25 All dimensions are in inches. All dimensions are in inches. 6 Energy Recovery Ventilator Service Clearances ERV-251, 361, 521 and 581 units require minimum clearances to perform routine maintenance, such as filter replacement, energy wheel cassette inspection, and fan belt adjustment. Blower and motor assemblies, energy recovery wheel cassette and filter sections are always provided with a service door or panel for proper component access. Clearances for component removal may be greater than the service clearances, refer to drawings below for these dimensions. ERV-251, ERV-361, ERV-521, ERV-581 ERV-522, ERV-582 Access PanelsAccess Panel Cassette slides out* Exhaust Side Outdoor Air SideT R *ERV-251, 361, and 521 only. Arrangement A Intake Hood Exhaust Hood Cassette slides out* Exhaust Side Outdoor Air Side T S R Access Panels Access Panels Access Panel *ERV-251, 361, and 521 only. Arrangement B, C or D Recommended Service Clearances Unit Size R S T X ERV-251 32 30 30 ERV-361 44 (30 for maintenance) 30 30 ERV-521 60 (39 for maintenance) 40 40 ERV-581 65 (32 for maintenance) 40 40 ERV-522 38 ERV-582 42 Cassette Cassette Access PanelAccess PanelAccess PanelAccess Panel X X X X Arrangement A Cassette CassetteSupply Weatherhood Exhaust Weatherhood Access PanelAccess Panel Access PanelAccess Panel Access Panel X X X X Arrangement B, C or D All dimensions are in inches. 7Energy Recovery Ventilator Electrical Information The unit must be electrically grounded in accordance with the current National Electrical Code, ANSI/NFPA 70. In Canada, use current CSA 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). All wiring beyond this point has been done by the manufacturer and cannot be modified without affecting the unit’s agency / safety certification. If field installing an additional disconnect switch, it is recommended that there is at least four feet of service room between the switch and system access panels. When providing or replacing fuses in a fusible disconnect, use dual element time delay fuses and size according to the rating plate. If power supply is desired through bottom of unit, run the wiring through the curb, cut a hole in the cabinet bottom, and wire to the disconnect switch. Seal penetration in cabinet bottom to prevent leakage. The electric supply to the unit must meet stringent requirements for the system to operate properly. Voltage supply and voltage imbalance between phases should be within the following tolerances. If the power is not within these voltage tolerances, contact the power company prior to operating the system. Voltage Supply: See voltage use range on the rating plate. Measure and record each supply leg voltage at all line disconnect switches. Readings must fall within the allowable range on the rating plate. Voltage Imbalance: In a 3-phase system, excessive voltage imbalance between phases will cause motors to overheat and eventually fail. Maximum allowable imbalance is 2%....

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