Install Instructions

Time proportional reheat
This application is for a BAC-8005 or BAC-8205 controller. The time proportional reheat
option is typically used in hydronic systems with a hot water reheat coil and a wax top
control valve. The reheat output is a triac that can switch up to 1ampere at 24volts AC.
For cooling and heating, a duct temperature sensor is required for Discharge Air Temperature
limiting and automatic changeover. See the topic Advanced options on page 35 for
instructions to enable Discharge Air Temperature limiting.
When connecting the controller to a fan powered VAV unit, the fan circuits must be
compatible with the following specifications.
l The fan start circuit is a 24 volt AC pilot duty output.
l The fan speed output is 0-10 volts DC.
Submittal sheets for several variations of this application are available from the Resources
page at www.SimplyVAV.com.
Illustration 6–4 Time proportional reheat
ON CTS
1 2
COMM
READY
AI1
AI5
GND
AO4
AO3
SC
BO8
BO5
BO6
SC
BO7
24VAC
AI6
GND
AI7
T-STAT/ SENSOR
-A
+B
S
EOL
BACnet MS/TP
Fan
Speed
Duct
Temp
Sensor
24VAC
Fan start
24 VAC
24VAC THERMAL
ACTUATOR
SimplyVAV Section 6: Application drawings
Revision G 48