Lennox LGT Series User Manual


ELECTRONIC OR ELECTROMECHANICAL THERMOSTAT
RED
2987
WHT
1
RED
654378910
RED
BLU
12
123
123
2431
1236
26 7
PNK
GRY
WHT
YEL
YEL
YEL
YEL
YEL
RED
RED
BLK
BLK
RED
P255P255
10
GRY
Voltage: All Voltages
Model: LC, LG, LH, LD Series RTU
Supersedes: N/A Form No:
Thermostat
Rev: 1
Y
R
B
Y
Y
15
Y
R
B
16
17 12
YEL
YEL
YEL
YEL
RED
RED
BLK
BLK
RED−BLK
GRY
RED−BLK
GRY
YEL
YEL
YEL
YEL
PNK
PNK
GRY
1
GRY
910
24563
78 1093281 4567
RED
4361 2
1
P251J251
1
J250 P250
2
3
4
2
3
4
1
P253J253
2
3
4
1
J252 P252
2
3
4
1 8 7 2
WB−031 WB−030
B
A
A55.J297
A55.J297
1
ORN
2
YEL
1
J261
234
YEL YEL PNK
GRY
123
12
RED RED
6
C AI−1 GND HUM GND AI−2
1,5
A55.J299
DI−1 R
FIRE ALARMCONTACT
SUPPLIED BY OTHERS
C
P299
J299
P387
J387
R
J297
P297
J298
P298
A55.J298
A55.J298
A55.J298
2
3
4
− 01
538078−01
HEATI NG
SECTI ON
A
COOLI NG
SECTI ON
B
WI RI NG DI AG RAM FLOW
SECTI ON
B3
COOLI NG
SECTI ON
C
ACCS
SECTI ON
D
ACCS
CTRL SMOKE
DETECT
A173
5
6
SENSOR 1SENSOR 2
77
7
S52
ION
TEMP
2Y1YC1YGCR
RCIAQ+
RCIAQ+
R IAQ+ IAQ−
C
SUPERMARKET REHEAT
3STAGECOOLING/
3STAGEHEATING
BACNET GATEWAY
GND
DENOTES OPTIONAL COMPONENTS
AND WIRING
GND
CLASS 2FIELDWIRING
5
FREE
8
A55
MAIN CTRL
GND
DI−1
R
9
R
DI−4
C
FREE
S27
C
DI−2
R
DI−3
TO PROVIDE SUPERMARKET
REHEAT SCHEME USE S86
DEHUMIDISTAT AND K55
C G W1
TO M4 THERMOSTAT INPUT
Y1
FROM IAQ
WIRING DIAGRAM
OCP
GND
GLO DO−1 Y2
P424
R
ALL OTHER
THERMOSTAT SIGNALS
REMAIN CONNECTED
AS SHOWNONTHE TOP
TO PROVIDE THREE
COMPRESSOR STAGES.
REQUIRES3HEAT,
3 COOL THERMOSTAT
ANDK27 RELAY
J298 J297 J299
J387
A55
W2
24VAC
45
S149
R

Lennox LGT Series Specifications

General

Brand	Lennox
Model	LGT Series
Category	Air Handlers
Language	English