Assessments - 1, GPA: 3 ( )

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Many buildings have ceiling return air plenum as in Figure B. Fresh air from the HRV/ERV can be introduced directly into the ceiling space but this should occur near the air handler’s intake. By operating the HRV/ERV on a 24 hour/7 day battery backed timer, the unit can be set to operate only when occupancy or indoor conditions require the air exchange. In installations where it is satisfactory to provide general exhaust from the space, the air to be exhausted may be taken directly from the return air plenum to the HRV/ERV as it is drawn back to the air handler. Fresh air supplied by the HRV/ERV is then introduced directly into the return air plenum but at a location closer to the air handler. The air handler would have a constant running blower to effectively distribute the fresh air and remove the stale air. Balancing dampers would be located in both the HRV/ERV supply and exhaust ducts between the return air plenum and the HRV/ERV. NOTE: At no time should the air handler T.E.S.P. on the return duct exceed that of the HRV/ERV . 15 The Integrated HVAC System ECONOMIZER HRV/ERV FRESH AIR SUPPLY HRV/ERV UNIT STALE AIR EXHAUST TO HRV/ERV SUPPLY DUCT RETURN AIR DUCT or BREATHER T FRESH AIR SUPPLY STALE AIR EXHAUST ROOFTOP UNIT B.D. B.D. Example only - Duct connections not typical ROOFTOP UNIT HRV/ERV FRESH AIR SUPPLY SUPPLY DUCTWORKCEILING RETURN AIR PLENUM ROOF DECK STALE AIR EXHAUST HRV/ERV UNIT ECONOMIZER 12" BREATHER SPACE B.D. B.D.FRESH AIR SUPPLY STALE AIR EXHAUST Example only - Duct connections not typical Figure A Figure B 16 PVC Support Straps (Supplied by others) Various Installation Types NOTE: When installing your HRV/ERV flexible duct connectors should Figure 7A Saddle Installation be installed between the HRV/ERV and the galvanized duct work. rod and U channel. (Supplied by others) Hang unit with suspended rods and "U" channel members. Figure 7B Curb Mounted Threaded Vibration Isolators (Supplied by others) Mount unit on wooden or metal curb assembly. Unit must be raised an adequate height for installation and slope of drain lines. Curb is wood or metal (Supplied by others) May be anchored to floor,leaving space for drain connections Figure 7C Suspended Vibration Isolators (Supplied by others) Unit Suspended using . Polyester reinforced PVC support straps. 17 Electrical Connections It is recommended that a licensed electrician make all electrical connections. It is very important that the unit be properly grounded. It is recommended that a separate 15 amp/120 volt circuit be used. WARNING: In order to prevent electric shock when cleaning or servicing the HRV/ERV, it is extremely important to confirm the polarity of the power line that is switched by the safety (disconnect) switch whose control arm is located on the outside of the electrical control box area. The hot line (black) is the proper line to be switched. To confirm the proper polarity, use a voltmeter or test lamp to make sure there is no power after the switch when the door is open. Check between that point and ground (on the cabinet). This must be done as occasionally some buildings are improperly wired. Always make sure the HRV/ERV is properly grounded. Black Black White Power Supply Cord Line GND. GreenNeut. Power Terminal Block. Electrical Connection FAN DEFROST Models 700FD, 850FD, 1200FD Fan defrost HRV’s are equipped with an electronically controlled fan defrost system to remove frost that collects on the warm air side of the aluminum heat transfer surfaces of the heat exchanger core. When the outside air temperature drops below 27°F(-3°C), defrost is activated which provides for an automatic defrost cycle. During the automatic defrost cycle the fresh air supply is shut off while the exhaust fan contin ues to operate. This allows warm inside air to flow through the heat exchanger core melting frost accumulation. After the defrost period, the fresh air supply fan automatically returns to the normal speed and fresh outside air continues to be drawn into the building. Water from the melted frost collects in the bottom drip pans and drains out through the bottom drain connections. The defrost cycle repeats automatically until the air temperature rises above 27°F(-3°C). DAMPER DEFROST Models 700DD, 850DD, 1200DD These damper defrost HRV’s have an electronically controlled damper defrost mechanism. If the outside temperature drops below 27°F(-3°C ), the defrost timer is activated. A motor driven damper door mechanism opens the defrost port and at the same time closes off the supply air from outside. After approximately 3 minutes, the damper operates in the opposite direction to close off the defrost port and reopen the fresh air at the supply port. The 27.5 minute wait time and 3 minute defrost cycle repeat until the temperature again rises above 27°F (-3°C). Self Test of Defrost Systems Models 700, 850, 1200 If confirmation of the defrost system is needed, complete the following steps. 1. Disconnect power to the unit and open access/ ...

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