7
HVAC Output
The AirBoss
™
controls the HVAC equipment through a set of six “dry contact” output relays. When a
thermostat calls for equipment operation, the AirBoss
™
closes the appropriate output relays, sending the
“R” signal from the HVAC Transformer back to the appropriate equipment terminals.
There are LEDs directly below the HVAC output terminal strip. When the output relays close, the
coresponding LEDs are illuminated (Fig. 6a).
Bring the Equipment transformer R and C to the coresponding terminals on the HVAC Terminal strip.
Zone Solenoids
Signal LED Indication
Service Provided
W1, W2 Red first and second stage heat
Y1,Y2 Yellow first and second stage compressor
G
Green
fan
O
Yellow reversing valve
(energized in cooling)
B
No LED reversing valve
(energized in heating)
Fig 6a
Fig. 6b
Damper positioning is controlled by a bank of 24VDC solenoids (one per zone) mounted along the top of
the box. When a zone is to be served, the solenoid is de-energized and a vacuum passes through the
valve, opening all the dampers in that zone. The zones not calling will energize their solenoids allowing
a pressure to pass through the valves, closing all the dampers in those zones. The zones that are open
for service are identified by a green lit LED below the “Zone Solenoid” terminal block
(Fig. 6b)
.
REMEMBER:
Vacuum Opens the Dampers
Pressure Closes the Dampers
The solenoids are 24VDC.
Do not connect thermostat or transformer wires to the solenoid terminals. Damage will occur.
Rev. 5/01/01
U.S. and Foreign Patents & patents pending. © copyright 2004 by Arzel Zoning Technology, Inc.
