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K232
24VAC
9
6
TB1
1
TB1
H1
H2
C2
C1
S149
A
K220
B
TB1
C
F4
3
L1
L2
L3
F3
GROUND
KEY
COMPONENT
A96
CONTROL, INVERTER
CONTROL,VFD BOARD
A183
MOTOR-BLOWER
B3
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
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
T3EH 072/150, 10−15 kW Y Voltage − Sequence of Op-
eration
Heat Call ELS / ELP
1 - W1 (W2 in ELP) heat demand energizes the
economizer relay K43 and heat relay K9.
7
2
S50
K220-1
4
S50
J248
1
P248
B
PC
STF
1
RL
RH
C
SD
A96
P248
2
J248
1
A
K232
B
HE1
HE2
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
1
S149 SWITCH AND K220 RELAY MAY BE
FIELD SUPPLIED OR USE AVAILABLE KIT
S50 LOCATION ON UNITS WITH TWO
2
SINGLE SPEED COMPRESSORS
3 USE COPPER CONDUCTORS ONLY
4 S50 LOCATION ON UNITS WITH ONE
DUAL SPEED COMPRESSOR
30-10-2017 04:37:04 PM, 7X10
S49
5
K43-1
7
2
A183
H2
1
A
PC
K43
2
STF
B
3
RL
4
RH
5
SD
TB13
G
R
S
T
A96
U
G
V
W
B3
2 - K9−1 closes energizing contactor K15.
3 - K15−1 closes and assuming primary limit S15 and
secondary limit S20 are closed, heating elements
HE1 and HE2 are energized.
Page 26
TB1
TB1
W1
W2
S15
ELP
ELS
UNITS
UNITS
T2
S20
W1
A
K9
K15
B
C
C TB1
KW
HE1
HE2
HE3
HE4
10
5
5
15
7.5
7.5
LINE VOLTAGE FIELD INSTALLED
DENOTES OPTIONAL COMPONENTS
HEATING - ELECTRIC
R
Y2
Y1
G
W1
W2
VFD CONTROL (G)
COMMON
REV 0
Lennox Commercial
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