Installation
Wiring terminal
Installation
CONVENTIONAL HEAT/COOL
Single transformer (use Jumper wire)
B+ A+ B- A- C | B O Y Y2 G RC RH W2 W R S2 S1 T1 T2 RSB RSA |
Wire specifications: | B+ / B- – Receive communication terminal |
(reference automation system)1 | |
|
COMMUNICATION
TERMINALS
NOT USED | NOT USED |
|
|
|
|
|
|
|
COOLING | COOLING | FAN |
| |||
1st | 2nd |
|
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
|
|
TRANSFORMER
JUMPER
2nd HEATING 1st HEATING
THERMOSTAT IS POWERED FROM 8819 OR 24VAC
TRANSFORMER
OUTDOOR TEMP SENSOR | REMOTE TEMP SENSOR |
SUPPORT
MODULE
A+ / A- – Transmit communication terminal | ||
(reference automation system)1 | ||
| ||
Installation notes: | C – 24VAC Thermostat power (common) from 8819 | |
• Ensure power at the HVAC equipment is off. | R – 24VAC Thermostat power (hot) from 8819 | |
• Loosen screw terminals, insert stripped wire and | B – Reversing valve for heat2 |
B+ A+ B- A- C B O Y Y2 G RC RH W2 W R S2 S1 T1 T2 RSB RSA
Two transformers (Remove Jumper Wire)
| O – Reversing valve for cool2 | |
• Push the excess wire back into the opening and plug | Y – 1st stage cooling / compressor or dehumidifier3 | |
the wall opening to prevent drafts. | Y2 – 2nd stage cooling / compressor | |
Note: If the HVAC system was installed before the | ||
G – Fan | ||
automation system, the HVAC installer may have | ||
| ||
powered the thermostat connecting a wire to the | RC – 24VAC supply cooling4 | |
C terminal and installing a jumper wire from the R | RH – 24VAC supply heating4 | |
terminal to RH or RC.. When used with an automation | W2 – 2nd stage heat / auxiliary / | |
system, the R and C terminals on the Model 8800 | ||
W – 1st stage heat / auxiliary / | ||
thermostat should only be connected to the same | ||
terminals on the 8819 or a dedicated 24VAC transformer. | S1 & S2 – outdoor temperature sensor (optional) | |
There should be no connection to the R or C terminals | ||
T1 & T2 – remote temperature sensor (optional) | ||
coming from the HVAC equipment. | ||
RSA & RSB – 8081 or 8082 Support Module | ||
| ||
| communication (half duplex)5 |
1Refer to Aprilaire HVAC Automation System Installation Manual for communication wiring details.
COMMUNICATION
TERMINALS
NOT USED | NOT USED |
|
|
|
|
|
|
COOLING | COOLING | FAN | |||
1st | 2nd |
|
| ||
|
|
|
|
|
|
|
|
|
|
|
|
COOLING TRANSFORMER
TRANSFORMER
HEATING
2nd HEATING 1st HEATING
THERMOSTAT IS POWERED FROM 8819 OR 24VAC
TRANSFORMER
OUTDOOR TEMP SENSOR | REMOTE TEMP SENSOR |
SUPPORT
MODULE
2O and B terminals are both
3When the unit is configured for humidistat mode.
4Jumper between RC & RH is used in single transformer systems (see wiring diagrams).
5Refer to Support Module literature for wiring details.
B+ A+ B- A- C B O Y Y2 G RC RH W2 W R S2 S1 T1 T2 RSB RSA
4 | 5 |