Components; Status Lights - Zonex DigiTract 4 Installation Manual

A. HVAC Unit/LAT Terminals - Connects to HVAC unit
and Leaving Air Sensor (LAT).
LV LV: LAT terminals. The LAT monitors the leaving air
temperature.
OAS: Optional Outside Air Sensor for use in Fossil
Fuel / Dual Fuel applications. Not used in GE.
W1: First stage heat. When energized (W1 made to
R), energizes first-stage heat.
W2: Second stage heat. When energized (W2 made
to R), energizes second-stage heat.
G: Blower. When energized (G made to R), energi-
zed the indoor blower.
Y1: First stage cool. When energized (Y1 made to R),
energizes first stage cooling.
Y2: Second stage cool. When energized (Y2 made to
R), energizes second stage cooling.
R: HVAC unit 24 V power. Powers the Digitract 4
board and zone thermostats.
C: HVAC unit 24V power return.
B. Thermostat Terminals - Connects up to four zone
thermostats.
W: Heat call. When energized (W made to R),
requests the Digitract 4 to run in heat mode.
R: HVAC unit 24V power.
Y: Cool call. When energized (Y made to R),
requests the Digitract 4 to run in cool mode.
G: Blower Fan. When energized (G made to R),
requests the Digitract 4 to turn on the indoor
blower fan.
C: HVAC unit 24V common.
C. Damper Terminals - Connects dampers for up to four
zones and damper power supply.
TR1/TR2: 24V ac transformer terminals. This transfor-
mer powers only the zone dampers.
1 1: Zone damper 1.
When energized, power zone damper 1 closed.
2 2: Zone damper 2.
When energized, power zone damper 2 closed.
3 3: Zone damper 3.
When energized, power zone damper 3 closed.
4 4: Zone damper 4.
When energized, power zone damper 4 closed.
D. Damper Status LEDs - On when corresponding zone
damper is being powered closed.
E: Board Number - This number indicates the circuit
board number and revision. You must know this
number if conferring with technical support.
SYSTEM CONTROLLER - GAS/ELECTRIC

COMPONENTS

ON
I
OFF
LV
}
LAT
LV
OAS+
Y1
G
OAS-
A
Y2
W1
OB
G
W2
Y1
R
STAT 1
C
E R Y G C
W1
OB
B
W1 R Y G C
ZONE 1
THERMOSTAT
F. Special Function Jumpers
GE/HP jumper - Place on proper pins for desired application.
O/B jumper - For heat pump application only. Place in O or B
position for proper reversing valve action. Not used in GE.
FF fossil fuel jumper -Place jumper in FF position to use fossil
fuel features. Not used in GE.
G. Microcontroller - Responsible for activation and control of the
unit based upon thermostat input.
H. HVAC System Status LEDs - Indicates what the DT4U is energiz-
ing on the HVAC system.
Y1: Compressor, yellow On when the 1st-stage cool is energized.
Y2: Compressor, yellow On when the 2nd-stage cool is energized.
G: Blower, green. On when the indoor blower is energized.
W1: Heat, red. On when 1st-stage heat is energized.
W2: Heat, red. On when 2nd-stage heat is energized.
PWR: Power, orange. On when power at R and C and the power
Switch is on. Flashing when in Capacity Control cut out mode.
See Status Lights section, page 6, for further information.
I. Power Switch - When OFF, power from the HVAC unit transform-
er is disconnected from the Digitract 4 and thermostats. When
ON, power from the HVAC unit transformer is supplied to the
Digitract 4 and the zone thermostats.
J. Adjustable Potentiometers - For HIGH limit, LO limit, TIME change-
over and BALANCE POINT (BP). Use these potentiometers to adjust
limits for a customized job. From factory the settings are 145° high,
45° low, 15-minute changeover and 33° balance point.
33
O/B FF GE
F
25 41
BP
HP
G
H
Z
ONEX
W2
W1/OB Y2
DIGITRACT
MODEL: DT4U
STAT 2 STAT 3
R Y G C W1 R Y G C
W1 W1
OB OB OB
W1
W1 R Y G C W1 R Y G C
ZONE 2 ZONE 3
THERMOSTAT THERMOSTAT THERMOSTAT
J
45 120-130 15
40 50 115 125-145 5 25
LO HI TIME
DPR 1
1
D
DPR 2
1
DPR 3
2
DPR 4
2
C
3
3
E
4
4
TR1
TR2
STAT 4
R Y G C
R Y G C
ZONE 4
7