9
Air Quality Sensor – AQS 1(
Not compatible with ERV-WI 500)
The wall mount Air Quality Sensor (AQS) monitors
indoor air quality and activates the override mode when
cigarette smoke, formaldehyde, benzene, volatile
organic compounds and other pollutants are detected.
The unit will then return to normal mode once the air
pollutants are reduced to a pre-determined lower level.
Three low voltage wires are required for operation
* This control is not a warning device.
Dehumidistat – MDEH 1
The wall mount dehumidistat monitors the humidity level
in the area it is installed. When the humidity level rises
above the desired set-point, the HRV will activate to high
speed/override mode. Once the humidity level returns to
desired condition, the unit will return to the normal mode.
Two (2) low voltage wires required for operation.
Note the
dehumidistat helps dehumidify by increasing the speed of the
HRV/ERV. Dehumidification will only take place when the air outside is
dryer than the air inside.
OPTIONAL REMOTE CONTROLS
1. Continuous / Ventilation Mode
In this mode of operation both fans are operating and exchanging air with the outside. The heat/energy recovery ven-
tilator (HRV/ERV) 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 control. The "Low" and "Med" fan speed selection will cause the unit
to operate in continuous exchange mode at a reduce exchange rate. Continuous mode is recommended, since pollu-
tants are slowly but constantly being generated in a building.
NOTE: Model ERV-WI 500 is a single speed unit only. Optional speed control is available.
2. Intermittent / Standby Mode
The system is always on standby and operates at high speed when activated by an optional remote control
(required): "Standby" should be selected if the user wishes to stop the unit from continuous exchange.
3. Defrost (Fan shutdown HRV-XI 450 & ERV-WI 500 only)
The automatic defrost cycle of HRV’s consists of a fan shut-
down. When the supply air stream temperature goes below
23°F (-5°C), the supply motor shuts down and the exhaust
motor goes in to high speed. Ambient air is passed through
the unit for a period of 5 minutes. The supply motor will then
re-start and run at the preset speed. The exhaust motor will
also slow down to the preset speed, and the unit will operate
in the run cycle for 25 minutes. This fan shutdown defrost
cycle continues until the supply air stream rises above 23°F
(-5°C).
MODES OF OPERATION
OPERATION
The HRV/ERV is shipped from the factory on low speed, intermittent operation can be obtain by toggle switch located
on outside of cabinet (HRV-XI 450 & ERV-XI 450) or by manipulating jumpers in the electrical box. See wiring diagram.
The ERV-WI 500 is factory set to high speed. Internal low voltage contacts allow interuption of power to unit when
optional remote control is used. See spec sheet for control options.
SETTING SPEED
HRV-XI 450
ERV-XI 450
Example
Dry Contacts
* HRV-XI 450 Shown
*
