Lennox ELA Series Unit Information page 25

ELA072/240 − SEQUENCE OF OPERATION
1 - W1 heat demand energizes the economizer relay
K43.
24V POWER
COOL 2(Y2)
COOL 1(Y1)
BLOWER(G)
HEAT 1(W1)
HEAT 2(W2)
VFD CONTROL (G)
A183
H1
G 8
6
W1
7
W2
5
C1
GND
24V COMMON
FIGURE 8. Typical Control Wiring used with ELS and ELP Outdoor Units
TB1
G
W1
W2
TB1
C1
2 - When K43−1 closes, N.O. K232-1 closes , sending
a signal to inverter A96.
3 - A96 starts forward rotation to control blower B3 speed.
A2
RC
R
Y1
G
W1
W2
L
A
S1
RT2
S2
Y2
C
KEY
SENSOR-ELECTRONIC
A2
A63 SENSOR-CO2
J3 JACK-UNIT ECONOMIZER
PLUG-LESS ECONOMIZER
P3
SENSOR-REMOTE
RT2
TB1
1
THERMOSTAT SUPPLIED BY USER
2 REMOVE P3 WHEN ECONOMIZER IS USED
3 J3 MAXIMUM LOAD 20VA 24VAC CLASS II
Page 25
TB1
R
Y1
OC
A183
H1
3
Y1
4
Y2
A63
1
8
7
2
Y2
C
COMPONENT
TERMINAL STRIP-CLASS II VOLTAGE
DESIGNATES OPTIONAL WIRING
CLASS II FIELD WIRING
ACCESSORIES
6
1
2
3
4
5
8
9
10
11
12
13
14
15
7
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