33
-t°
-t°
-t°
Flame Rectification
Electrode - FRE
Flame Ignition
Electrode - FIE
W
ater Flo
w
Sensor - WFS
Pow
er Switch
Internal Fuse
(10 A)
Pow
er ON LED
Exhaust
Pressure
Switch
- EPS
W
ater
Ov
er T
emperature
Switch - WOS
Exhaust
Ov
er T
emp.
Switch - EOS
Burner
Ov
er T
emp.
Switch - BOS
Circulation Line
Temperature
Sensor - WCT
12 VDC
Safety V
alv
e Modulator
Ground
W
ater Outlet
Temperature
Sensor - WO
T
W
ater Inlet
Temperature
Sensor
- WIT
M
OT
Flue
Fa
n
If a
ny o
f t
he
o
rig
in
al w
ir
e a
s s
up
plie
d w
it
h t
he
w
at
er
h
ea
te
r
m
us
t b
e r
ep
la
ced
, i
t m
us
t b
e r
ep
la
ced
w
it
h w
ir
e 1
8
AW
G
(*
* 16 A
W
G
) -
105 °
C
-
U
L1015,
o
r e
qu
iv
al
en
t
18 A
W
G
or
1
mm
2 M
WG
(*
* 1
6 A
WG
o
r
1.
5
mm
2 MW
G
)
(green)
(green)
(gre
y)
(white)
( white)
(gre
y)
(blue)
(red)
(red)
( red)
(blue)
( blue)
(red **)
Gas V
alv
e
Circulation
Pump
*
(orange)
(y
ello
w)
(brown)
(black)
(black)
(black)
(black)
(black **)
(orange)
(orange)
(bro
wn)
(y
ello
w)
(violet)
Error Code LED
Anti F
reeze
Element
(optional)
Control
panel /
Diagnosis
APPENDIX D – Electrical Connection Diagram
Fig. 35
