Fantech SHR 1504 Installation Manual

Also see for SHR 1504: Operation manual Installation manual Operation manual Operation manual

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Fantech SHR 1504 Installation Manual Manual pdf 6 page image

6fantechHRV/Furnace ducting for Partially Dedicated SystemAir from inside* Unit air flow should be balanced while HRV is on "Normal" speed andfurnace blower is running.Air return1 m (3' 3")min.recommendedCold airreturn* Ductwork layout may dif-fer depending on modelInstallation examples (Cont'd)DIRECT CONNECTION of the FRESH air to living area to the RETURN PLENUMof the AIR HANDLER (Stale air drawn from key areas of home)PARTIALLY DEDICATED SYSTEM (BETTER)Suggested installation for:• Central furnace (airhandling unit or centralair conditioners)• When ducting freshair to living area is notpossible or practical,i.e. expensive or whenthe central AHU willoperate year-round.Benefits: Conditions thefresh air prior todistributing it throughoutthe house1. Furnace blower must operate when ventilation from HRV is required. Thefurnace should be set to run continuously or interlocked with HRV2. Stale air is drawn from key areas of the home (bathroom, kitchen, laundryroom).3. Fresh air is supplied to the return air plenum of the furnace.4. Due to the difference in pressure between the HRV and the equipment itis being connected to the HRV’s airflow must be balanced on site, usingthe procedure found in the section “AIRFLOW BALANCING”Fantech heat recovery ventilators (HRV) that use a supply fan shutdown for frost preven-tion do not include an outdoor air motorized damper. If you are using a simplified installa-tion, i.e. connecting the HRV supply air duct to a furnace's return air duct, the HRV mustoperate continuously. When the HRV is turned off, no warm exhaust air will flow throughthe HRV but the furnace's fan will continue to draw in outdoor air directly into the furnace.If it's cold outside, cold air will be introduced, without re-heating, directly into the furnace.If the HRV is installed such that the homeowner may turn off the HRV during the winter, werecommend installing a motorized damper between the HRV's supply air and the furnace'sreturn air duct that closes when the HRV is not operating. See wiring diagram (figure 1).You may also choose to use a Fantech HRV that uses a recirculation defrost that incorpo-rates an outdoor air damper.DamperMotor24 VAC TransformerCOM NOHRV Furnace interlockSee page 17.24V120VFigure 1*Transformer and Damper motor not includedStale air tooutsideFresh air fromoutsideFresh air toliving areas