Lennox ELXA Series Unit Information page 27

T3EH ELECTRIC HEAT SEQUENCE OF OPERATION (refer to figure 9) - 1 STAGE HEAT
W1 heat demand (W2 for Heat Pumps) energizes the K9 heat relay.
K9−1 closes energizing K15 contactor.
K15−1 closes energizing heating elements HE1 and HE2 assuming primary limit S15 and secondary limit S20 are closed.
NOTE – For Heat Pumps, W1 heat demand operates the heat pump in heating mode.
9
24VAC
TB1 K232
TB1
H1
H2
C3
C2
C1
1
DL58
3
A
K43
B
TB1
C
F4
3
L1
L2
L3
F3
GROUND
KW HE1 HE2
10 5 5
15 7.5 7.5
1 S149 SWITCH AND K220 RELAY MAY BE
FIELD SUPPLIED OR USE AVAILABLE KIT
2 S50 LOCATION ON UNITS WITH TWO
COMPRESSORS
3 USE COPPER CONDUCTORS ONLY
4
S50 LOCATION ON UNITS WITH ONE
COMPRESSOR
6
7
2
1 K220-1
2
S50
4
S49
S50
J248
P248
1
S149
A
1 1
P248
K220
1
B
J248
HE2
HE1
IF ANY WIRE IN THIS APPLIANCE IS REPLACED, IT
MUST BE REPLACED WITH WIRE OF LIKE SIZE,
RATING,INSULATION THICKNESS AND TERMINATION
WARNING-ELECTRIC SHOCK HAZARD, CAN CAUSE
INJURY OR DEATH. UNIT MUST BE GROUNDED IN
ACCORDANCE WITH NATIONAL AND LOCAL CODES
DISCONNECT ALL POWER BEFORE SERVICING
5
K43-1
7 2
H2
T2
7
K264-1
4
TB13
J246
P246
J247
P247
B3
Supersedes
C 2022
FIGURE 9
Page 27
TB1 TB1
W1 W2
S15
HEAT PUMP
COOLING
UNITS
UNITS
S20
W1
A
K9
K15
B
C
C TB1
KEY
COMPONENT
CONTROL, INVERTER
A96
CONTROL, VFD BOARD
A183
MOTOR-BLOWER
B3
DL58 DELAY, ADJUSTABLE, ON MAKE
F3 FUSE-ELECTRIC HEAT
F4 FUSE-UNIT
HE1
ELEMENT-ELECTRIC HEAT 1
HE2 ELEMENT-ELECTRIC HEAT 2
J/P246 JACK, PLUG-POWER TO VFD
J/P247 JACK, PLUG-VFD TO MOTOR
J/P248 JACK, PLUG-VFD CONTROL
K9,-1
RELAY-HEAT
K15,-1 CONTACTOR-ELECTRIC HT 1
K43,-1 RELAY-ECONOMIZER BLOWER
K220,-1 RELAY-OVERFLOW
K232 RELAY-INVERTER PROTECTION
K264-1 RELAY-A96 SIGNAL SWITCHING
S15 SWITCH-LIMIT,PRIMARY,ELECT HT
S20 SWITCH-LIMIT,SECONDARY ELECT HT
S49
SWITCH-FREEZESTAT COMPRESSOR 1
S50 SWITCH-FREEZESTAT COMPRESSOR 2
S149 SWITCH-OVERFLOW
T2 TRANSFORMER-ELECTRIC HEAT
TB1 TERMINAL STRIP-CLASS II VOLT
TB13 TERMINAL STRIP-POWER DISTRIBUTION
LINE VOLTAGE FIELD INSTALLED
DENOTES OPTIONAL COMPONENTS
WIRING DIAGRAM
HEATING - ELECTRIC
T3EH - ELITE 072 - 150 UNITS - Y
10,15 kW
SECTION B3
New Form No.
538288-01
Lennox Commercial
R
Y3
Y2
Y1
G
W1
W2
VFD
CONTROL (G)
COMMON
10/22
REV 1