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Wiring
All wiring must comply with local electrical code or as
specified on the unit wiring diagrams. Refer to figure 1
for field wiring connections. Example wiring diagrams are
provided in the back of this manual.
24VaC
Connect 24VAC power to P176−1 and 2 from a class 2
transformer using standard 18AWG thermostat wiring.
P176−2 (common) must be connected to earth ground.
t
NtC1−1 (a113) f
ypiCal
All inputs connected to P178
and P179 are optional. See
System Mode sections for
P178 options.
COM
*
Connect air ow switch
and N.C. terminals to
24VAC and common if not
used. Service switch and
N.O. switch are optional.
P176
P177
P178
P179
P181
P182
Pushbutton
Short push: By−passes on/o delays
Long push: Resets NTC
ADDRESS DIP Switch
Address DIP is used for setting the unit address
when connected to the L Connection network.
Switches add for a total of 31 addresses (1 to 31).
NTC must be reset after changing an address.
w
ield
iriNg
INPUTS
1
+
CO
CO
(0−10VDC)
2
2
−
+
RH
RH (0−10VDC)
−
+
DMP
DAMPER FB (2−10VDC)
−
P179
1
1
ZONE
2
O
(A2)
3
RETURN
4
(RT16)
5
DISCHARGE
O
6
(RT6)
7
OUTDOOR
8
(RT17)
P178
HB
24VAC
1
*
+
AIR FLOW
−
SWITCH
+
SERVICE
−
*
+
N.C.
−
+
N.O.
_
P177
Power in − 24VAC
Digital inputs − 24VAC or DC
T emperature sensors − thermistor type
Analog inputs − CO2, RH − 0 1− 10VDC,
Damper FB 2−10VDC
Relay outputs − 24V (AC or DC) 2A max
Relay outputs − 24V (AC or DC) 2A max
EXAMPLE
OF UNIT
ADDRESS 13
4 8 16
2
1
1 + 4 + 8 = 13
Figure 13. Typical NTC1−1 (A113) Field Wiring
C
ommUniCaTion
Cable type: Lennox P/N 94L63 or 27M19, Belden type
88761 or equivalent. (22AWG stranded or twisted pair,
100% aluminum shield with drain wire, Teflon jacket).
Daisy chain the communications cable between each NTC
and NCP as shown in "Figure 11. L Connection Network
Daisy−chain Communication Wiring" on page 9". Do
not connect the shield drain wire to the NTC " G".
NOTE: Make sure the total run of communications wiring
does not exceed 4000 feet (1219 m).
OFF AUTO ON
UNIT
ADDRESS
1 2 4 8 16
N
SW1
CONFIG
12 3456 78
N
2A FUSE
P181 and P182 outputs are iso-
lated and may be connected to dif-
ferent transformers. Each output
has a 2 amp fuse.
HP REVERSING VALVE
XMIT
24VAC power input
POWER IN
has a 2 amp fuse.
HOT
1
L Connection
24VAC
communica-
10VA
tion bus
MIN.
LED's
Heartbeat LED:
Green 1 sec. on/o = Normal operation
Green 3 sec. on/o = Delay initiated
Red 1 sec. on/o = No run lock−out
XMIT Transmit LED:
Yellow − = Data is being transmitted
Blink rate varies − as slow as once every 30
seconds when many units are on the network
Digital Input LED's:
AFS−Yellow steady= Blower is operating
Service−Yellow steady= Indicates the service
input is energized.
N.C.−Yellow steady= Indicates the N.C. input
is energized.
N.O.−Yellow steady=Indicates the N.O. input
is energized.
Thermostat Output LED's:
Green, red, or yellow steady=Indicates relay is
closed.
Page 13
w
iRing
OUTPUTS
P181
Y1
NO
Y1
R
C
Y2
NO
Y2
C
Y3
NO
Y3
C
W1
NO
W1
C
1
P182
W2
W2
NO
C
G
G
NO
C
OCP
NO
OCP
C
C
O
O
B
B
1
Con guration DIP SW10
TYPE
1
2
Electric HEAT OFF OFF
HP Type 1
ON
OFF
HP Type 2
OFF ON
Gas Heat
ON
ON
COMMON
COOL
3
4
P176
1−Stage cool
OFF OFF
2−Stage cool
ON
3−Stage cool
ON
HEAT
5
6
GND
No heating
OFF OFF
1−Stage heat
ON
2−Stage heat
OFF ON
Temperature Thermistor
Resistance
RT6, RT16
RT17
A2
30°F
34,566
NA
40°F
26,106
NA
50°F
19,904
0,904
60°F
15,313
6,313
70°F
1 1,884
2,884
80°F
9,298
0,298
90°F
7,332
8,332
100°F
5,826
NA
All values are +/− 2%.
OFF
ON
OFF
2
1
1
1
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