RECOMMENDED CONTROL
SEQUENCES
Several possible control scenarios are listed below:
1.Use a programmable electronic thermostat with auxiliary terminal to control the ERV based on daily programmed occupancy periods. Bard markets and recommends Bard Part No.
2.Use a motion sensor in conjunction with a mechanical thermostat to determine occupancy in the classroom. Bard markets the CS2000A for this use.
3.Use a DDC control system to control the ERV based on a room occupancy schedule.
4.Tie the operation of the ERV into the light switch. The lights in a room are usually on only when occupied.
5.Use a manual timer that the occupants turn to energize the ERV for a specific number of hours.
6.Use a programmable mechanical timer to energize the ERV and indoor blower during occupied periods of the day.
7.Use Bard Part No.
CONTROL WIRING
The QWSERV comes wired in the low voltage control circuit from the factory.
With the “X” Remote Thermostat Option, it is default wired into the “A” terminal, which drives the vent to operate only during occupied periods when using a Bard
With the “D” Door Mounted Thermostat Option, the thermostat is already connected and programmed to operate the QWSERV only during occupied periods.
With the “H” Door Mounted Thermostat and CO2 controller, the unit is ready to go with
VENTILATION AIRFLOW
The ERV is equipped with a
TABLE 1
VENTILATION AIR (CFM)
| High Speed | Medium Speed | Low Speed |
| (Black) | (Blue) | (Red) |
CFM |
|
|
|
450 | 375 | 300 | |
|
|
|
|
The ERV units are wired from the factory on medium intake and low exhaust speeds. The ERV is equipped with independently controlled
WARNING
Open disconnect to shut all power OFF before doing this. Failure to do so could result in injury or death due to electrical shock.
Moving the speed taps located in the control panel can change the blower speed of the intake and exhaust. See Figure 1.
FIGURE 1
BLOWER SPEED ADJUSTMENT
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