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K232
24VAC
9
6
TB1
TB1
H1
H2
C2
C1
A
B
TB1
C
F4
L1
L2
L3
F3
GROUND
KEY
COMPONENT
MOTOR-BLOWER
B3
B3
MOTOR-BLOWER
F3
FUSE-ELECTRIC HEAT
F4
FUSE-UNIT
ELEMENT-ELECTRIC HEAT 1
HE1
ELEMENT-ELECTRIC HEAT 2
HE2
HE3
ELEMENT-ELECTRIC HEAT 3
HE4
ELEMENT-ELECTRIC HEAT 4
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
K16,-1
CONTACTOR-ELECTRIC HT 2
K19,-1
RELAY-STAGE TWO HEAT
K32,-1
RELAY-SEQUENCER,ELECT HT 1
K43,-1
RELAY-ECONOMIZER BLOWER
RELAY-OVERFLOW
K220,-1
K232
RELAY-INVERTER PROTECTION
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-CLASS II VOLT
T3EH 072/150, 25−35 kW Y Voltage − Sequence of Op-
eration
First Stage Heat Call
1 - ELS
−
W1
heat
economizer
relay
ELP − Unit will operate in "heat mode" from the
indoor thermostat.
7
2
S50
1
K220-1
4
S50
J248
1
P248
A183
H2
B
PC
1
2
STF
1
RL
3
S149
4
RH
C
SD
5
A96
P248
2
J248
1
K220
A
K232
B
HE1
HE2
HE3
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
S149 SWITCH AND K220 RELAY MAY BE FIELD
1
SUPPLIED OR US AVAILABLE KIT
S50 LOCATION ON UNITS WITH TWO
2
SINGLE SPEED COMPRESSORS
3
USE COPPER CONDUCTORS ONLY
S50 LOCATION ON UNITS WITH ONE
4
DUAL SPEED COMPRESSOR
demand
energizes
K43 and heat relay
30-10-2017 02:51:33 PM, 7X10
S49
5
K43-1
7
2
S15
A
PC
T2
S20
K43
STF
B
RL
RH
SD
K15
TB13
R
S
T
G
A96
U
V
W
G
HE4
B3
2 - K9−1 closes energizing contactor K15. Second-
stage heat relay K19 is energized. (Unit is ready for
second stage heat but ONLY if there is a W2 call)
3 - K15−1 closes and assuming primary limit S15 and
the
secondary limit S20 are closed, heating elements
K9.
HE1 and HE2 are energized.
Page 27
R
Y2
Y1
G
W1
W2
VFD CONTROL (G)
TB1
W1
TB1
TB1
ELP
W2
W2
ELS
UNITS
UNITS
ELS
UNITS
W2
W1
A
A
K19
K9
K32
B
B
K16
C
C TB1
K19-1
COMMON
KW HE1
HE2 HE3
HE4
25
6.25
6.25
6.25
6.25
35
8.3
8.3
8.3
8.3
LINE VOLTAGE FIELD INSTALLED
DENOTES OPTIONAL COMPONENTS
HEATING - ELECTRIC
Lennox Commercial
REV 0
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