Carrier HRVCCLHA Installation Instructions Manual

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Contents

9balancing dampers while located in flexible duct. Insulating overthese dampers is strongly recommended after balancing is completeto prevent condensation problems.Flow CollarFlow collars are temporary and should be installed as close to HRVas possible and in straightest sections of duct to ensure accuracy(see Fig. 16). If only 1 flow collar is available, install collar instale--air duct of HRV, and record airflow. Next, install collar in thefresh--air duct and record airflow. If 2 flow collars are available, itwill be much easier to read airflow and properly adjust dampers tobalance unit.With speed control at maximum speed (high--speed operation) andcontinuous air exchange occurring with outside, connect hosesfrom flow collar to a magnehelic gauge (see Fig. 17). The gaugemust be leveled and zeroed before use to read accurately. If needlefalls below zero, reverse hose connections.Measure exhaust air first, it is typically the lowest pressure due tonature of system and duct work. Next, measure fresh air. If fresh airreading is higher than exhaust reading, adjust damper until readingis same. If reading is lower, return to exhaust damper and adjust toobtain same reading. You can use label on flow collar to convertstatic pressure into airflow.Once HRV is balanced and dampers are adjusted to equalizeairflow, use tape or drive screws to prevent damper blades frommoving. Remove flow collars and secure ducts. This procedureshould be repeated to ensure unit is balanced properly.NOTE: The flow collar directional arrow (on flow collar) must beoriented in the airflow direction of unit.NOTE: Some field modification may be required to ensure propertemporary installation of flow collar during balancing wheninsulated flexible duct is used.VENTILATION EVALUATIONUNIT DAMAGE HAZARDFailure to follow this caution may result in reduced unitefficiency, capacity or unit life.DO NOT use HRV during construction of a house or whensanding drywall. This type of dust may damage system.CAUTION!When ventilation requirement is determined, use Product DataSheets to reference unit airflow delivery and performance.The ventilation capacity of an HRV unit while at maximum speedis defined according to greatest total airflow required. Thesemethods are derived from the Canadian National Building Code1995 version and the CSA F326.1 revision.The following 2 methods can be used to evaluate the approximateventilation needs of a house. Accuracy of calculations aredependent upon the information available and knowing criticalmeasurements of the structure (see Fig. 18).METHOD 1To calculate approximate ventilation:The sum of rooms X 10 CFM per room, plus 20 CFM for amaster bedroom or basement.Example: 11 rooms X 10 CFM + 2 X 20 CFM = 150 CFM.NOTE: The master bedroom and basement are not included infirst part of this equation, but figured in at second part of equation.METHOD 2To calculate approximate ventilation:Referencing same example (see Fig. 18).Total cu ft X 0.3 per hr = total. Take total and divide by 60 toget CFM.Example:1320 sq ft X 8 ft in height = 10560 cu ft per floor10560 cu ft x 3 floors = 31680 total cu ft in house31680 cu ft X 0.3 air change per hr = 9500 cu ft9500 cu ft ÷ 60 minimum per hr = 160 CFM.Conclusion: The total amount of air flow needed is 160 CFM. Thisfalls within airflow range of a HRVCCLHA1150 size unit.BASEMENTMASTERBEDROOMWASH-ROOM#1WASH-ROOM#2 BEDROOM#3BEDROOM#5BEDROOM#41320 sq ft (125 sq m) 1320 sq ft (125 sq m)LIVING ROOM#6FAMILY ROOM#10KITCHEN#9LAUNDARYROOM#8WASH-ROOM#7DINING ROOM#111320 sq ft (125 sq m)A98388Fig. 18 -- Floor Plan ExampleHRV