A05331
Fig. 6 - Chain Spring Installation
Independent System Application
In the absence of a forced-air system and a typical duct system layout, the ERV/HRV can be applied as an independent or stand alone unit. To ensure comfort, this type of application involves running both fresh-air and return-air registers (or stale-air pickup registers) throughout the home.
Fresh-air registers are normally located in bedrooms, dining room, living room, and basement. It is recommended that registers be placed 6 to 12” (152 to 305mm) from the ceiling on an interior wall and airflow directed toward ceiling. If registers are floor installed, airflow should be directed toward the wall.
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
Do not install return-air registers (or stale-air pickup registers) in same room as gas furnace or water heater.
Return-air (or stale-air pickup registers) are normally located to draw from kitchen, bathroom, basement, or other rooms where stale-air can exist.
Proper size and type of registers must be used to minimize pressure drop. The velocity of airflow through register should not be above 400 ft (122m) per minute.
Maximum length of duct for the system should be designed according to the highest speed of the unit. Refer to specifications listed in unit Product Data Digest for ventilation capacities.
Forced-Air Application
Most ERV/HRV applications will be installed in conjunction with new or existing forced-air system. To operate properly, the fresh-air supply and stale-air return from ERV/HRV connect directly to return-air duct system. This is how the ERV/HRV distributes fresh air and removes stale air from inside of building (See Fig. 7). For these installations, furnace or fan coil blower must be interlocked and operate continuously whenever ERV/HRV is energized. See Fig. 17 for interlock wiring detail.
NOTE: The fresh air from ERV/HRV is introduced into return-air duct at a point no less than 6 ft (1.8m) upstream of furnace or fan coil. This connection should be direct (See Fig. 7). This is to allow incoming fresh-air to mix before entering indoor equipment.
