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Manual 2100-310D
Page 2
The units are wired from the factory on low speed.
The speed can be changed by switching the toggle
switch on the front of the QERV to the desired speed.
The QERV2-A4B is equipped with independently
controlled 3-speed motor to provide the capability of
adjusting the ventilation rates to the requirements of
the specific application and to be able to provide
positive pressure in the structure. This is
accomplished by setting the intake blower on a higher
speed than the exhaust blower.
RECOMMENDED CONTROL
SEQUENCES
Several possible control scenarios are listed below:
1. Use a programmable electronic thermostat with
auxiliary terminal to control the QERV based on
daily programmed occupancy periods. Bard
markets and recommends the White-Rodgers
1F94-80 (Bard Part No. 8403-034), programmable
electronic thermostat for heat pump applications.
2. Use a motion sensor in conjunction with a
mechanical thermostat to determine occupancy in
the classroom. Bard markets the CS2000 for this
use.
3. Use a DDC control system to control the QERV
based on a room occupancy schedule to control the
QERV.
4. Tie the operation of the QERV 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 QERV for a specific number of hours.
6. Use a programmable mechanical timer to energize
the QERV and indoor blower during occupied
periods of the day.
VENTILATION AIR FLOW
The QERV is equipped with a 3 speed motor to
provide the capability of adjusting the ventilation rates
to the requirements of the specific application by
simply changing motor speeds.
TABLE 1
VENTILATION AIR (CFM)
deepShgiH
kcalB(
deepSmuidiM
)eulB(
deepSwoL
)deR(
MFC
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