Table of Contents
Advertisement
Computer board assembly
240H/340H
Wiring diagram
SV3
SV2
240H/340H
SV1
MV
BL
BL
BL
BL
O.H.C.F
BL
Hi-limit
BL
switch
Drain plug
detector
Hi-limit switch
for exhaust
Drain plug
detector
Exhaust
thermistor
Gas
Propor-
�onal
Valve
MAX bu�on
MIN bu�on
Increase bu�on
Decrease bu�on
540H
FM
BL
Y
W
Flame rod
Ground
AFR rod
Gas
Propor-
�onal
W
Valve
R
Y
Bypass
W
Valve
BL
BR
DIP switches
Green LED
MAX bu�on
MIN bu�on
Increase bu�on
Decrease bu�on
701
711
708
714
721
716
408
402
407
722
061
707
R
P
P
708
711
G
PCB
LB
BL
73
53
713
9
3
240H/340H Outdoor Only
721
G
G
G
G
721
240H/340H Indoor
W
Only
W
G
G
W
G
W
W
W
240H/340H
Indoor Only
714
408
W
R
407
W
1
2
3
4
5
6
7
8
9
10
OFF
Green LED
DIP switches
IG
P
Igniter rod
P
711
R
O
103
O
G
Y
3
708
9
709
53
73
R
714
402
715
402
715
721
540H
Indoor
540H
Indoor
Only
BK
BK
Heat
exchanger
BK
thermistor
BK
Inlet thermistor
715
BK
Outlet thermistor
67
540H
701
713
714
715
103
709
716
402
715
IG
Heater
Igniter rod
713
Thermostat
BK
BK
W
W
G
SW
Ground
Surge
box
W
FM
Y BL O
W
103
BK
R
704
AFR rod
709
Y
G
O
120 VAC
Flame rod
G
Ground
402
Flow
Ground
R
W
Sensor
BK
Adjust-
402
BK
ment
R
Valve
BK
BL R
Built-in controller
W
Outlet thermistor
BK
BK
Inlet thermistor
BK
707
Remote controller
Heater
PCB
Thermostat
713
713
713
BK
BK
W
W
G
SW
Ground
Hi-
MV
BL
limit
BL
switch
W
SV1
BK
BL BL
BL
BL
SV2
O.H.C.F
BL
LB
G
SV3
R
Flow
G
R
BK
Adjust-
Ground
ment
Flow
R
Sensor
W BK
1
W
2
BK
W
Parent
BK
Only
W
BK
Hi-limit switch
W
for exhaust
W
Drain plug detector
G
G
Exhaust thermistor
W W
Page
Owner's Guide
Components Diagram
709
711
708
713
103
402
402
715
707 722
721
Y
240H/340H Outdoor Only
Heater
Y
Y
BK
Heater
Heater
Y
240H/340H Indoor Only
BK
Heater
Y
W
Heater
Heater
Y
713
713
Flow
722
Y
540H Outdoor Only
Heater
Y
Y
BK
Heater
Heater
Y
540H Indoor Only
BK
Heater
Y
Surge
W
box
Heater
Heater
Y
713
713
120 VAC
704
W BL
Built-in controller
722
R BK
Remote controller
707
540H
Outdoor
Only
721
Drain plug
G
G
detector
Advertisement
Table of Contents
