Wiring Terminal - Aprilaire 8800 Safety & Installation Instructions

INSTAllATION

wIRINg TERMINAl

B+ A+ B- A- C B O Y Y2
wire specifications:
18-24 gauge thermostat wire
CAT-5 or equivalent for communication terminals
Installation notes:
• Ensure power at the HVAC equipment is off.
• Loosen screw terminals, insert stripped wire and
re-tighten .
• Push the excess wire back into the opening and plug
the wall opening to prevent drafts.
Note: If the HVAC system was installed before the
automation system, the HVAC installer may have
powered the thermostat connecting a wire to the
C terminal and installing a jumper wire from the R
terminal to RH or RC . When used with an automation
system, the R and C terminals on the Model 8800
thermostat should only be connected to the same
terminals on the 8819 or a dedicated 24VAC transformer.
There should be no connection to the R or C terminals
coming from the HVAC equipment.
4
G RC RH W2 W R S2 S1 T1 T2 RSB RSA
b+ / b- – Receive communication terminal
(reference automation system)
1
A+ / A- – Transmit communication terminal
(reference automation system)
1
C – 24VAC Thermostat power (common) from 8819
R – 24VAC Thermostat power (hot) from 8819
b – Reversing valve for heat
2
O – Reversing valve for cool
2
Y – 1st stage cooling / compressor or dehumidifier
Y2 – 2nd stage cooling / compressor
g – Fan
RC – 24VAC supply cooling
4
RH – 24VAC supply heating 4
w2 – 2nd stage heat / auxiliary / E-Heat
w – 1st stage heat / auxiliary / E-Heat / humidifier
S1 & S2 – outdoor temperature sensor (optional)
T1 & T2 – remote temperature sensor (optional)
RSA & RSb – 8081 or 8082 Support Module
communication (half duplex)
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1 Refer to Aprilaire HVAC Automation System Installation Manual
for communication wiring details.
O and B terminals are both de-energized when system mode is
2
OFF or in AUTO when the heating and cooling equipment is idle.
When the unit is configured for humidistat mode.
3
Jumper between RC & RH is used in single transformer systems
4
(see wiring diagrams).
Refer to Support Module literature for wiring details.
5
INSTAllATION
CONVENTIONAl HEAT/COOl
COMMUNICATION
TERMINALS
B+ A+ B- A-
3
3
COMMUNICATION
TERMINALS
B+ A+ B- A-
SINglE TRANSfORMER (USE JUMpER wIRE)
C B O Y Y2 G RC RH W2 W R S2
TwO TRANSfORMERS (REMOVE JUMpER wIRE)
C B O Y Y2 G RC RH W2 W R S2
THERMOSTAT IS POWERED
FROM 8819 OR 24VAC
TRANSFORMER
SUPPORT
MODULE
S1 T1 T2 RSB RSA
THERMOSTAT IS POWERED
FROM 8819 OR 24VAC
TRANSFORMER
SUPPORT
MODULE
S1 T1 T2 RSB RSA
5