6
CONTROL FEATURES
Basic Control: Allows the user to manually set fan speed to low or high as required to maximize comfort.
Standard Control: Offers automatic dehumidistat control and the option to select continuous or intermittent fan operation. Setting the wall
control to low will activate the continuous mode.
Automatic Control: In addition to the features found with standard control, this package offers a recirculation mode. These controls may
only be used to operate stand--alone units with the defrost option which enables the recirculation feature.
CONTROL
DESCRIPTION
FAN SPEED
CONTROL
DEHUMIDISTAT
CONTROL
CONTINUOUS
MODE*
INTERMITTENT
MODE*
CIRCULATION
MODE[
Basic Yes No Yes No No
Standard Yes Yes Yes Yes No
Automatic]Yes Yes Yes Yes Yes
* Air exchange with outside.
† No air exchange with outside.
‡ Use only on units with defrost.
CONTROL DESCRIPTION AND USAGE
Fan Speed Control — Enables user to modulate fan speed from low to high air exchange with outside.
Dehumidistat Control — Allows the user to select the relative humidity level at which the unit would change fan speed for dehumidification
in the winter months.
Continuous Mode — If the relative humidity inside the building is lower than selected, air exchange occurs with the outside at low speed. If
the relative humidity inside the house is higher than selected, air exchange occurs with the outside at high speed. Ensures continuous air
exchange for constant air quality.
Intermittent Mode — If the relative humidity inside the building is lower than selected, no air exchange occurs and the system turns off. If
the relative humidity inside the house is higher than selected, air exchange occurs with the outside at high speed. Ensures minimum air
exchange level when the building is unoccupied to minimize operating costs.
Circulation Mode — If the relative humidity inside the building is lower than selected, the ambient air would be circulated and filtered at
high speed. If the relative humidity inside the house is higher than selected, air exchange would occur with the outside at high speed. Ensures
continuous movement and filtration of air for maximum comfort. Available with automatic control only.
AUTOMATIC DEFROST CYCLE FEATURES
All models offer a non--electric defrost cycle feature which prevents frost and ice buildup within the heat recovery core. When the outside air
temperature falls below 23_F(–5_C) it is electronically sensed and the dampers close the outside air ports. This allows warm indoor air to
recirculate within the heat recovery core. The frequency of this cycle increases as the outside air temperature decreases.
MODEL 23°FTO55°F(–5°CTO–15°C) 4°FTO–17°F (–15.6°C TO –27.3°C) BELOW –18°F (–27.8°C)
DEFROST* EXCHANGE[DEFROST* EXCHANGE[DEFROST* EXCHANGE[
HRVXXSVU 6 Minutes 60 Minutes 6 Minutes 32 Minutes 6 Minutes 20 Minutes
HRVCCLVU 6 Minutes 60 Minutes 6 Minutes 32 Minutes 6 Minutes 20 Minutes
* All defrost times are in the standard mode (as shipped)
† Time between defrost when within specified temperature range
VENTILATOR SIZING
The tables below should be used to determine the required airflow for a home. These guidelines are taken from ASHRAE 62.2--2007.
Ventilation Air Requirements, cfm
FLOOR
AREA (ft2)
BEDROOMS
0 --- 1 2 --- 3 4 --- 5 6 --- 7 >7
<1500 30 45 60 75 90
1501---3000 45 60 75 90 105
3001---4500 60 75 90 105 120
4501---6000 75 90 105 120 135
6001---7500 90 105 120 135 150
>7500 105 120 135 150 165
Ventilation Air Requirements, L/s
FLOOR
AREA (m2)
BEDROOMS
0 --- 1 2 --- 3 4 --- 5 6 --- 7 >7
<139 14 21 28 35 42
139.1---279 21 28 35 42 50
279.1---418 28 35 42 50 57
418.1---557 35 42 50 57 64
557.1---697 42 50 57 64 71
>697 50 57 64 71 78
