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32 4034-102 Rev F 02/04
HRV200PLUS INSTALLATION INSTRUCTIONS
5. Ventilation Operating Modes Connector P1
a. OFF Mode
The HRV is idle until an input is sensed. This is the normal standby state when the HRV Plus is powered but not receiving any
command inputs.
b. Low Speed Ventilation Mode
Low Speed Ventilation Mode is activated when 12VDC is sensed at the O terminal. The HRV operates with blowers on low
speed and defrost control is active. High Speed Mode inputs override Low Speed inputs and place the unit in High Speed
Mode.
c. High Speed Ventilation Mode
The HRV is operating with blowers on high speed and defrost control is active. When 12VDC is sensed continuously at the B
terminal for more than 4½ seconds, the HRV will enter High Speed Ventilation Mode for as long as the override signal is
present, then return to its previous mode when the input is removed.
The dehumidistat on wall-mounted controls place the HRV into High Speed Ventilation Mode for moisture control. The
dehumidistat senses the humidity in the living area and activates high speed blower operation when the humidity level exceeds
the set point selected by the home owner. The HRV returns to its normal operating mode when the humidity level in the indoor
air stream falls below the set point.
d. High Speed Ventilation Mode 20 Minute Timer
The HRV is operating with blowers on high speed and defrost control is active. When the override signal is sensed at the B
terminal for more than ½ second but less than 4 ½ seconds, the HRV will enter High Speed Mode for 20 minutes then return
to its normal mode.
e. Intermittent Ventilation Mode
Intermittent Ventilation Mode is activated when 12VDC is sensed at both the W and the O terminals. The HRV operates on
Low Speed Ventilation Mode for 20 minutes then is off for 40 minutes. High Speed Mode inputs override Intermittent Ventilation
Mode inputs and place the unit in High Speed Mode.
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6. Ventilation Control Terminals - Connector P1
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