Carrier HRVCCLHU Installation, Start-up, And Operating Instructions Manual

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Carrier HRVCCLHU Installation, Start-up, And Operating Instructions Manual Manual pdf 13 page image

MASTERBEDROOMBEDROOM#4WASH-ROOM#1WASH*BEDROOM#3BEDROOM#51320 sq ft (125 sq m)LIVING ROOM#6FAMILY ROOM#10W_'_ IJ'UN DARY KITCHENI DINING ROOM#11I 1320 sq ft (125 sq m)BASEMENTt320 sq ft (125 sq m)A98388Fig. 26_Floor Plan ExampleMethod 1To calculate approximate ventilation:The sum of rooms X 10 CFM per room, plus 20 CFM for a masterbedroom 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. 26.) Total cuft X 0.3 per hr= total. Take totaland divide by 60 toget CFM.Example:1320 st] ft X 8 ft in height = 10560 cuft per floor10560 cu ft X 3 floors = 31680 total cuft in house31680 cuft X 0.3 air change per hr = 9500 cuft9500 cuft + 60 minimum per hr = 160 CFMConclusion: The total amount of airflow needed is 160 CFM. Thisfalls within airflow range of a HRVCCLHU1150 size unit.CONTROL BOARD OPERATIONStep 1--Board FunctionNOTE: To ensure proper operation of HRV, configuration jump-ers are located on electronic control board and must matchconfiguration setup shown on Fig. 27 and 28 under Jumper Table.Jumpers are factory set and do not require any changes unlesscontrol board is replaced. If control board is replaced, or youencounter unusual start-up operation, check jumpers to make surethey are located properly. (See Fig. 27 and 28.)Step 2--DefrostThe HRV continually monitors the outside air temperature. If theouLside air is at or below 23°F(-5°C), the HRV will initiate adefrost cycle by closing the outside air damper and re-circulatingwarm indoor air through the heat recovery core. This happensapproximately every hr with 5 minute defrost cycle. During thisprocess, core is defrosted without the use of electric strip heat. At5°F(-15°C), unit will defrost for 5 minutes every half hr. At-22°F(-30°C), the unit will sense a need to defrost every 20minutes with a 5 minute cycle. See the Troubleshooting section fora control logic explanation.Step :)--OFF and INTERMITTENT/OFF ModeWhen HRV is Off, KI relay is open, and K5 relay is energizedwhich closes outside air damper. (See Logic Diagram in Fig. 27and 28.1Step 4_High-Speed Air ExchangeWhen high-speed air exchange occurs, KI and K2 relays areenergized and K5 relay is de-energized. This opens low-speedcontacts, and closes high-speed contacts on K2 relay. This alsoopens contacts on K5 relay which opens outside air damper. Then,115vac is applied between orange and gray wires on Molex plug(pins 1 and 6) and blower motor runs in high-speed operation.Also. l l5vac is applied across pins 5 and 7, this energizesinterlock relay. (See Logic Diagram in Fig. 27 and 28.)Step 5---Low-Speed Air ExchangeWhen low-speed air exchange occurs, KI Relay is energizedwhich closes the contacts. K2 and I<5 relays are de-energized. Thiskeeps low-speed contacts closed and high-speed contacts open onK2 relay, and opens outdoor air damper. 120vac is appliedbetween Red and Gray wires on Molex plug (pins 1 and 4) andblower motor runs in low-speed operation. Also, 115vae is appliedacross pins 5 and 7, this energizes interlock relay. (See LogicDiagram in Fig. 27 and 28.)CARE AND MAINTENANCEStep 1--DoorHRV door can be removed by unlatching brief case style latches,then slide door to the right and remove it from hinges. Door mustbe in place and secured shut for proper operation.13