PG
23
APPENDIX 2 : FRESH AIR install and operation
To use the FRESH
AIR option; your system needs to have a fresh air baffle or an air to air exchange
r. This unit needs to
be in the closed/o
f
f position (outside air is blocked) when not energized (normally closed).
Fresh
Air baffle/ air to air exchanger installation
- Connect one end of the wire to the H
VAC’
s C terminal and connect
the other end to EX terminal on the thermostat. When Fresh
Air is requested, the thermostat energizes EX (connects EX
to RH).
The CT80 has two methods of providing Fresh
Air - FAN FRESH AIR and MANUAL FRESH AIR. FAN FRESH
AIR can be
accessed from the HOME screen.
T
ouch the
F
AN icon and choose FRESH.
The fresh air baffle or air to air exchanger
will activate every time the heat or cool comes on to add fresh air to your home.
To use MANUAL FRESH AIR from the
HOME screen, touch the
F
AN icon. Choose FRESH and touch ON.
The fan will run continuously with fresh air until
FAN
control is returned to
AUT
O.
Energy saving with Fresh
Air.
Y
ou can use your FRESH
AIR baffle as a source of HE
AT
or COO
L - Your fresh air
baffle can help you save money by allowing you to use it as your first stage of Heat or Cool depending on the outside air
temperature. For example, you can use it to cool o
f
f the house after a hot day when the outdoor night time temperature
cools down lower than the indoor temperature.
T
o do this in the Heat or Cool mode from the HOME screen, touch the main temperature display to go to the
temporary screen.
At the temporary screen touch FRESH
AIR.
The fresh air baffle will open and the fan will turn on when
the system calls for H
VAC.
The outside air will now be used to heat or cool the house.
The thermostat will use Fresh
Air
until the next program time slot is reached.
At the next time slot, the thermostat will revert to regular non-fresh operation.
The thermostat will revert to normal H
V
AC control if the room temperature does go the wrong way ( ie. increases in COO
L
mode) by 3
o
F or if the target temperature is not reached within 30 minutes while using FRESH
AIR.
