2.
With
,excess
excess
temperature
limit,
flow
switch,
main
burners.
Manual
resetting
of
this
con-
operating
limit,
system
operating
control,
trol
is
required.
high
gas
pressure
and
low
gas
pressure
switches
closed,
the
RA
890
relay
performs
9.
Low
water
or
no flow
condition:
its
electronic
check.
Its
toad
relays
then
pull
in
to
energize
terminal
5
of
the
relay,
.
The
flow
switch
contacts
will
open,
shut-
powering
the
gas
safety
shutoff
valve.
Main
ting
off
main
burner.
Boiler
will
not
fire
burners
ignite.
until
normal
flow
c ond
itions
are
re-
established.
3.
System
operating
control
is
satisfied.
.
Safety
shutoff
valve
is de-energized.
10.
If
the
red
running
light
on
the
control
box
fails,
the
following
safety
devices
should
.
Main
burner
shuts
off.
be checked:
.
Pilot
continues
to
burn
on
stand-by
.
O'perating
Limit
operation.
.
Low
Gas
Pressure
Switch
4.
If
flame
failure
occurs:
.
High
Gas
Pressure
Switch
.
.
Absence
of
flame
is
sensed
within
2
- 4
seconds.
.
Flow
Switch
.
Terminal
5
of
RA
890
relay
is
de-ener-
.
Excess
Temp.
Limit
Control
gized
and
main
burners
shut
off.
5.
If flame
cannot
be proven
within
15 seconds:
AIR
SHUTTER
ADJUSTMENT
.
The
RA
890
relay
will
lock
out
on
safety'
To
obtain
ideal
main
burner
operating
conditions,
closing
the
normally
open
(N.O.)
alarm
the
gas
and
air
must
be
properly
proportioned.
The
contacts
onrelay
and
activate
alarm.
proper
air-gas
mixture
may
be
obtained
by
rotating
the
air
shutter
on face
of burner.
.
Pilot
safety
switch
contacts
open
and
pilot
gas
supply
shuts
off
in
approximately
NOTE:
Spreader
type
burners
have
an
orange
90 seconds.
quality
In
the
flame
when
used
on
L.P.
gas.
This
is
a normal
and
approved
char-
.
After
cause
of
failure
has
been
corrected,
acteristic.
the
safety
switch
of
the
RA
890
relay
must
be
manually
reset
and
pilot
relighted
1.
Operate
the
system.
before
main
burner
will
re-lgnite.
2.
Loosen
the
locknut
and
open
the
air
shutter
6.
Low
gas
pressure:
wide.
.
If
regulator
outlet
pressure
to
the
control
3.
Gratiually
close
the
shutter
until
yellow
tips
string
drops
to
less
than
2.0"
W.C.
(Nat-
appear
in
the
burner
flame.
Slowly
re-open
ural
gas)
or
9.0"
W.C.
(Propane
gas),
the
the
shutter
until
the
flame
tips
are
blue.
Do
low
gas
pressure
switch
contacts
will
not
open
shutter
any
further
than
necessary
open,
shutting
off
the
main
burners.
Man"
as
flame
will
become
noisy
and
lift
from
the
ual
resetting
of
the
pressure
switch
is
burner.
required.
7.
High
gas
pressure:
CHECKING
AND
ADJUSTING
THE
INPUT
If
gas
supply
pressure
to
the
main
burner
orifices
exceeds
4,0"
W.C.
(Natural
gas)
or
1.
Attach
a
pressure
gauge
or
a
manometer
to
12.0"
(Propane
gas),
the
high
gas
pressure
the
gauge
port
and
refer
to
TABLE
2
for
contacts
will
open,
shutting
off
the
main
correct'manifold
pressure.
burners.
Manual
resetting
of
the
pressure
switch
is
required.
NOTE:
The
gas
meter
should
be
clocked
be-
fore
system
water
temperature
ex-
8.
Excessive
water
temperature:
ceeds
1500F.
If
boiler
water
temperature
exceeds
setting
2.
Use
this
formula
to
"crock"
the
meter.
Be
of
excess
temperature
limit
control,
the
con-
sure
that
other
gas
consuming
appliances
tacts
in
the
control
open,
shutting
off
the
are
not
ON
during
this
interval.
AOS
130
14
Raenbeck
FILED: NEW YORK COUNTY CLERK 02/20/2018 10:20 AM
INDEX NO. 190311/2015
NYSCEF DOC. NO. 337
RECEIVED NYSCEF: 02/20/2018
