Lennox LCH036 Installation Instructions Manual page 159

3- Third-Party Zoning ECTO 6.01 Option 0 -
The Unit Controller will operate up to four stages of
heating and cooling based on a third-party zoning
system. Only 4 digital inputs are required to control
the rooftop unit: G (blower enable), OCP (occupied),
Y1 (enables discharge cooling) and W1 (enables
discharge heating). Make wiring connections as
shown in figure 19.
24 VOLT FIELD WIRING
FOR UNITS WITH SUPPLY AIR VFD
24VAC Digital Signals
Ventilation Demand
rd
3 Party
Occupied Demand
Zoning
Cooling Demand
Control
System
Heating Demand
Optional Building Static Pressure
Supply Static Pr.
Switch(s) (S37,S39) or Sensor (A34)
Sensor (A30)
FIGURE 19
UNIT CONTROLLER
24VAC
THERMOSTAT
R C C G W1 Y1 Y2
W2
507232-02 9/2015
RTU w/Unit
Controller
G
O
Y1
W1
TB18
24 VOLT FIELD WIRING HOT GAS REHEAT UNITS
(Using A Humidity Sensor With Less Than 150 Ft. Wire Runs)
SENSOR
24VAC IAQ
G
L
O C P O C
R C AI1
HUM
A91
HUMIDITY
SENSOR
VIN
GND
VOUT
D-Hot Gas Reheat Units Only -
Install humidity sensor in accordance with instructions
provided with sensor. A DDC input may be used to initiate
dehumidification instead of a sensor. Make wiring
connections as shown in figure 17 for Thermostat Mode and
figure 18 for Zone Sensor Mode. In addition, connect either
a zone sensor or a dehumidification input as shown in figure
20.
Wire runs of 50 feet (mm) or less:
Use two separate shielded cables containing 20AWG
minimum, twisted pair conductors with overall shield.
Belden type 8762 or 88760 (plenum) or equivalent.
Connect both cable shield drain wires to TB1-7 as shown in
figure 20.
Wire runs of 150 feet (mm) or less:
Use two separate shielded cables containing 18AWG
minimum, twisted pair conductors with overall shield.
Belden type 8760 or 88760 (plenum) or equivalent.
Connect both cable shield drain wires to TB1-7 as shown in
figure 20.
Wire runs over 150 feet (mm):
Use a local, isolated 24VAC transformer such as Lennox cat
#18M13 (20VA minimum) to supply power to RH sensor as
shown in figure 21. Use two shielded cables containing
20AWG minimum, twisted pair conductors with overall
shield. Belden type 8762 or 88760 (plenum) or equivalent.
OUTPUTS
SMOKE
24VAC
DI1
TMP
D01 D02
R
UNUSED
WIRE
DRAIN
TWISTED
PAIR
ENERGY MANAGEMENT SYSTEM
DEHUMIDIFICATION SWITCH
NOT CONNECTED
Install optional A42
Phase Monitor and/or
S149 Overflow Control
FIGURE 20
Page 15
Humidity Sensor Cable Applications:
HUMIDISTAT
INPUTS
DI4 C
C DI2 R DI3 R