Honeywell HR230 - Manual (Page 9)

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Step 5
Your Fresh Air Ventilation System may utilize one or more timers. When
a high ventilation rate is desired, turn the timer to the desired number on
minutes. The Ventilator will switch from the Lo or Standby setting to the
high speed. The ventilator will return to the previous setting when the
time runs out.
Step 6
Your Fresh Air Ventilation System may utilize one or more wall switches
to provide manual control of the system. If a high ventilation rate is
desired, move a switch to the maximum position. The ventilator will run
at high speed until the switch is returned to the normal position.
NOTE: The ventilator will run at high speed if any device in the system
(Perfect Climate Comfort Center, dehumidistat, timer or wall
switch) is activated.