R
C
NOT
USED
ODT
INPUTS
OUTPUTS
POWER
W G
VENT
Gf
VENTILATION CONTROL
R
C
W
Y
G
R
C
W
Y
G
THERMOSTAT
HVAC SYSTEM CONTROL
WIRE NUT – FIELD SUPPLIED
EXISTING WIRE
NEW WIRE
OPTIONAL DISCONNECT SWITCH – LABEL
“MECHANICAL VENTILATION”
DO NOT
REMOVE THE PRE-INSTALLED YELLOW WIRES
WHEN WIRING TO THE HVAC SYSTEM.
FIGURE 7
– VENTILATOR WIRING
WIRING
The ventilator control is wired to the HVAC equipment as shown in
FIGURE 7
to provide the control with power and to signal the control
that the HVAC system is operating . When ventilation is needed but the
HVAC system is not running, the ventilator will turn on the HVAC system
blower to temper the outdoor air by mixing it with indoor air .
If the “Minutes per Hour” dial on the ventilator control is not readily
accessible, install an optional switch to break the ventilator control “R”
wire as shown in
FIGURE 7
. Label the switch so as to differentiate it
from other switches (“Mechanical Ventilation” label is provided in the
carton with the ventilator) .
1.
Disconnect power to the HVAC system prior to wiring to the HVAC
system controls .
2.
Run standard thermostat wire (18-22 AWG) as needed between the
ventilator, HVAC system and the disconnect switch .
3.
Wire as shown in
FIGURE 7
.
4.
Label the disconnect switch to differentiate it from other switches .
SET UP
The control can be set up to prevent ventilation during the hottest or
coldest periods of the day . When the outdoor temperature exceeds
the high value or falls below the low value, ventilation will stop and
additional ventilation will be brought in at a later time . See
Start Up and
Sequence of Operation
section for details .
1.
Remove the knob then remove the cover to adjust the high/low
temperature limit (see
FIGURE 8
) .
2.
Use a small flat head screwdriver to turn the potentiometer to
select:
A
– No limit, time only
B
– 105°F high limit, 20°F low limit
C
– 100°F high limit, 30°F low limit
D
– 95°F high limit, 40°F low limit
R C
ODT W G
VENT
Gf
90-2005
FIGURE 8
– SET TEMPERATURE LIMITS
TEST
After all ducting and wiring is complete, plug in the ventilator, restore power to the HVAC system and make sure the switch controlling the ventilator’s
electrical outlet is turned on . Turn the thermostat to the OFF mode to ensure that wiring the HVAC system has been done correctly and then return it
to the desired mode after testing . Rotate the Vent Time setting knob to Test/Reset:
1.
The display will show “- -”, the green “Active Ventilation” LED will blink
2.
The ventilator blower will start
3.
If the ventilator was properly wired to turn on the HVAC unit blower with ventilation, the HVAC blower will turn on
4.
If a separate damper was wired to the inlet duct (ventilation air discharges to the return side of the HVAC system), the damper will open
5.
After one minute the test will end and the display will blink and show the firmware revision level . Return the knob to the OFF position until the
desired Time Setting is determined .
5
