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Page
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
Ver. 1.00
CONFIDENTIAL
540 (T-H3) models
W: WHITE
R: RED
BK: BLACK
P: PURPLE
LB: LIGHT BLUE
BL: BLUE
G: GREEN
Y: YELLOW
O: ORANGE
BR: BROWN
8
7
6
5
4
3
2
1
ON
6
5
4
3
2
1
ON
R
W
G Y
PCB
W
120 VAC
G
Ground
SW
Ground
BK
W
G
BK
W
Surge
box
73
53
9
3
BL
BL
R
BK
R
W BK
BK
BK
BK
BK
BK
W
BK
W
BK
Hi-limit switch
for exhaust
Exhaust thermistor
W
W W
W
Heater
Y
Y
Thermostat
BK
O
Ground
Flame rod
AFR rod
BK
W
W BL
R BK
Temperature controller
BK
BK
W
MAX button
MIN button
Increase button
Decrease button
Green LED
Bank of
Bypass
Vavle
R
W
BR
Y
BL
Gas
Propor-
tional
Valve
R
Y
O
BL
W
FM
IG
Igniter rod
P
P
exchanger
Heat
thermistor
Inlet thermistor
Outlet thermistor
Temperature remote controller
Parent
1
2
Flow
Sensor
Flow
Adjust-
ment
Valve
Heater
Heater
540 Outdoor
Heater
Y
Y
Heater
Y
Y
Heater
Heater
540 Direct Vent Indoor
Hi-
swich
limit
O.H.C.F
MV
SV1
SV2
SV3
BL
BL BL
BL
LB
G
O
R
BL
540 Direct Vent Indoor Only
540 Direct Vent Indoor Only
DIPswitches
B
I
H1
J1
E3
E2
E1
F
K1
K2
A
G
C
J
H2
D1D2
L
C1
C2
A1
A2
B1