Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-32
5. [Optional]
Automatic electric
ignition of the
premix gas
pilot
shall be furnished. An
electric scanner,
of the UV principle,
shall confirm the pilot prior to the
delivery
of the low fire oil
supply.
6.
The single combustion
air
damper
motor shall
operate
the low
and high fire oil valves.
The damper
motor shall
regulate
the
fire
according
to
system demand
in
response
to the firing rate
control.
I.
Burner Design
–
Gas
and No. 2
Oil
1.
The burner
shall
be
the high
radiant multi–port type
for
gas
and
shall be the
pressure atomizing
for oil.
The burner
must be
approved
for
operation
with either natural
gas
or commercial
grade
No. 2
oil.
2.
The burner
shall
operate
on the
low–high–low
principle, and
must return to the low fire
position
prior to ignition.
3.
The burner
shall
remain
in the low fire
position during
ignition
and until main flame has
been
proven.
4.
Automatic
electric ignition of the
premix gas
pilot shall be
furnished. An
electric scanner,
of the UV principle, shall
monitor the pilot,
preventing
the primary fuel
valve
from
opening
until the pilot flame has
been
established.
5.
The single combustion
air
damper
motor shall
operate
the low
and
high fire oil
valves and
the
gas butterfly
valve.
The
damper
motor shall
regulate
the fire
according
to
system demand
in
response
to the firing rate control.
J. Main
Gas
T
r
ain
1.
The gas burner piping shall include
a
primary gas shutoff
valve.
It shall be
controlled
by the
programming relay
to start or stop
the
burner
and to
close automatically
in the
event
of power
failure, flame failure, or a low water condition.
2. A manual shutoff
valve
shall be
located ahead
of the primary
gas
valve.
3. A
plugged leakage test connection and
a
second manual
shutoff
valve
shall be
provided as
a
means
for a
tightness check
of the
primary shutoff valve.
4. A
gas pressure regulator
shall
be factory mounted and piped
for
pressure regulation
to the burner.
5.
Gas
Train
Components
a.
[Sizes
1500–2500]
The
primary
gas
shutoff
valve
shall
be
motorized
with a
proof
of
closure
switch.
b.
[Sizes
3000–5000]
The
primary
gas
shutoff
valve
shall
be motorized
with a
proof
of
closure
switch. High
and
low
gas pressure switches
shall be provided.
c.
[Size
6000]
The
primary
gas
shutoff
valve
shall be
motorized
with a
proof
of
closure
switch. A
second
gas
safety shutoff valve and
an
additional plugged leakage
test
cock
shall be provided. High and low
gas
pressure
switches
shall be provided.
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