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Controller Description
The
GEN III
is a micro-controller based, auto
change-over Universal Gas/Electric or Heat Pump
system controller (Part #
GEN III
). The
GEN III
controls a
zoned 2H/2C Gas/Electric HVAC unit or 3H/2C zoned
Heat Pump unit and communicates with and supports up
to 20 zones, utilizing pressure dependent, modulating
dampers and wireless thermostats. The
GEN III
gathers
information every 60 seconds from each damper board
while the wireless thermostats communicate with the system over a two-wire data link directing control based
decisions to the HVAC equipment. The
GEN III
is powered with one 24 V 40VA transformer, which also
powers all dampers in the system. Power from the controller, along with a two-wire twisted pair
communications loop, is daisy chained damper to damper to streamline installation and system
communications. The
GEN III
is equipped with integrated capacity control and High and Low temperature
limits to protect the compressor and heat exchanger. Outside air and return air sensors are also provided.
The HVAC unit is staged based on leaving air temperature and time. Auto change-over operation is vote
based, predicated on a first call, first served majority wins on changeover algorithm. Additional control
strategies are established on a Monitor Thermostat which initiates control decisions with the
GEN III
system
controller. Review controller terminal connections on the exhibit below:
A
B
C
D
E
F
G
H
I
J
K
AUX SENSOR (AS)
LEAVING AIR SENSOR (LVAIR)
OUTSIDE AIR SENSOR (OA)
RETURN AIR SENSOR (RA)
TO UNIT TERMINALS
COMMUNICATION LINK (BELDEN 8740)
24VAC IN
24VAC OUT
ID / SYNC
POWER SWITCH
STATUS LIGHTS
A. On/Off Switch
B. ID/Sync Button and Communication link light
C. Unit Status Lights
D. 24vac IN to power the GEN III board
E. 24vac OUT daisy chained out to the damper boards
F. Unit Terminals
G. RX/TX communication link (Belden 8740)
H. Aux Sensor (AS)
I. Leaving Air Sensor (LVAIR)
J. Outside Air Sensor (OA)
K. Return Air Sensor (RA)
GEN III CONTROLLER
GEN III
– VVT
SYSTEM COMPONENTS
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