Page 17
Rev: 0
Heat Input - 250k-400k BTUH
Supersedes: N/A Form No:
Model: LF25 Unit Heater; TUA25 Separated Combustion Unit Heater
Voltage: 120/60/1
02
03
04
05
06
07
08
01
AA BB
CC
DD
EE
FF
6
GV-M
SPARK
COM
M
3
BLU
BLU
BLU
PNK
BRN
S10
4
S18
8
S47
7
S195
9
S10
5
S18
11
GV-C
12
GV-H
2
S47
1
S195
3
NO COM
2
FAN1 -N
5
FAN1 -GND
8
FAN1 -L1
2
FAN2 -N
5
FAN2 -GND
8
FAN2 -L1
GRN- YEL
WHT
BLK
WHT
GRN- YEL
BLK
FLAME SENS
GRY
GND
GND- Gr oundi ng Po int
W2
L1
G
W1
5
XFMR -COM
6
XFMR - 24VAC
3
XFMR -N
1
XFMR -L1
HI
3
2
1
R
C
N
WHT-RED
4
CAI-N
1
CAI-L1
WHT
BLK
BLK
WHT
BLU
YEL
COMP-001
GND- Gr ounding Point
4
GND- BOARD
GRN- YEL
BLK
WHT
GRN- YEL
WHT
2
2
1
1
WHT
4
4
WHT
5
5
GRY
WHT
BRN
538024-01
0
538024-01
IGN CT RL
A3
1
FIELD PROVIDED POWER WIRING.
CONNECT TO P366 AND GREEN GROUND
SCREW LOCATED INSIDE UNIT.
LOW VOLTAGE THERMOSTAT CONNECTIONS
HEAT (W2)
HEAT (W1)
39
24VAC-IN
P368
1
J368
754
11262
P364 P365
P363
L1
P367
J367
1
3
5
6
R
24V COMMON (C)
24V POWER (R)
BLOWER (G)
G
C
P366
W2
W1
N
GND
FIELD PROVIDED
CLASS II 24VAC
THERMOSTAT WIRING
J366
-OUT
24VAC-IN
-OUT
-OUT
24VAC-IN
FAC RUN TEST
P373
L1
N
J363
41
GND WIRE
ATTACHED TO
XFMR MOUNTI NG
SCREW
J374
P374
4
HIGH VOLTAGE POWER CONNECTIONS
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