Modes Of Operation - Fantech SHR 1504 Operation Manual

MODES OF OPERATION

1. Continuous / Ventilation Mode
In this mode of operation both fans are operating and
exchanging air with the outside. The heat recovery ven-
tilator (HRV) constantly exchanges the air at the rate you
select, either at low or medium speed, and switches to
high speed when activated by an optional remote con-
trol. The "Low" and "Med" fan speed selection will cause
the unit to operate in continuous exchange mode at an
exchange rate of 35% and 50% maximum airflow rating
respectively. Continuous mode is recommended, since
pollutants are slowly but constantly being generated in
your house.
Air from
Outside
Air to
Outside
3.Defrost/Recirculation Mode (5 port "R" Models)
During the defrost sequence, it's mechanism uses a
motorized damper to temporarily block the incoming
fresh air stream allowing the warm air from the home
to circulate through the HRV. The exhaust blower
shuts down & the supply blower continues to run. The
unit then returns to normal operation, and continues
cycle.
Air from
House
4
2. Intermittent / Standby Mode (SHR(D) / VHR Series
of HRV's)
The system is always on standby and operates at high
speed when activated by an optional remote control.
"Standby" should be selected if the user wishes to stop
the unit from continuous exchange. We recommend
that the "Standby" mode only be used if your system is
equipped with an optional external control, in which
case, the unit would activate to "High" fan speed, until
the control is satisfied and then return to standby (off).
Air from
House
Air to
House
4. Defrost (Fan shutdown 4 port models)
During the defrost sequence, the supply blower shuts
down & the exhaust blower continues to ventilate for a
preset time. The unit then returns to normal operation,
and continues cycle
Air to Air to
House
Outside
* no exchange of air
Air from
House