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CALL
O
U
T
B
BURNER TRAY (Atmospheric)
1
B -
B
u
n r
r e
T
a r
B
u
n r
r e
T
a r
Burner Tray w/Gas Valve Nat Millivolt
Burner Tray w/Gas Valve Pro Millivolt
B
u
n r
r e
T
a r
B
u
n r
r e
T
a r
2
B -
B
u
n r
r e
S
p
a
3
B -
B
u
n r
r e
4-B
Burner Orifice Nat. #51 (Sea Level)*
Burner Orifice Pro. #57 (Sea Level)*
5-B
Burner Tray w/o Manifold w/o burners
BB
BURNER TRAY (Fan Assisted Low Nox)
1
B -
B
B
u
n r
r e
T
a r
B
u
n r
r e
T
a r
2
B -
B
B
u
n r
r e
H
o
d l
3
B -
B
B
u
n r
r e
4
B -
B
B
u
n r
r e
O
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Burner Orifice Nat. #31 (above 5000 ft.)*
5
B -
B
B
o l
w
r e
6
B -
B
A
r i
S
h
u
t t
r e
C
CONTROLS
1-C
Thermostat Auto Reset 135 Deg Surface Mount
2-C
AGS 135° (Auto Gas Shut-Off) - Red Epoxy
- 3
C
H
g i
h
i L
m
t i
- 4
C
. P
. C
B
o
a
d r
5-C
Thermostat Control MV Units Mechanical
- 6
C
T
e
m
p
e
a r
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G
GAS VALVE
- 1
G
C
o
m
b
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2-G
Combination Valve - Gas On/Off -Nat (for Low Nox)
HP
HEAT EXCHANGER - POLYMER
- 1
H
P
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c x
h
- 2
H
P
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- 3
H
P
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e
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H
e
a
- 4
H
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T
u
b
e
B
u
n
d
Tube Bundle Cupro-Nickel (Upgrade)
1
- 9
H
P
B
a
f f
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- 5
H
P
F
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e
N
t u
- 6
H
P
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G
a
- 7
H
P
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n
s
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A
d
S
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n
s
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W
l l e
- 8
H
P
B
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p
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s s
K
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- 9
H
P
B
y
p
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s s
V
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1
- 0
H
P
B
y
p
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s s
D
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1
- 1
H
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B
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p
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s s
S
r p
1
- 2
H
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h t
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m
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1
- 3
H
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m
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1
- 4
H
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1
- 5
H
P
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1
- 6
H
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1
- 7
H
P
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R
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g
(
) 2
1
- 8
H
P
S
a t
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s s
S
*FOR ALTITUDES ABOVE 2,000 FEET LEVEL, CONSULT THE FACTORY
**WARNING: The hydraulic conditions or water chemistry that caused the tube bundle to fail have very likely also
damaged the bypass valve and Unitherm Governor. We recommend you replace the Unitherm Governor and
inspect the bypass assembly. Failure to do so could cause premature failure of this replacement part.
D
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