C7027A, C7035, C7044A
Minipeeper Ultraviolet Flame
The
C7027A, C703SA
ultraviolet radiation emitted by combustion
flames. The flame detectors are used with
Honeywell flame safeguard controls to provide
flame supervision for gas, oil, or combination
gas-oil burners.
and
C7044A
detect the
Honeywell
Detectors
n
C7027A. C7035A,
are used with
R7849A,B
well controls.
n
C7044A
Honeywell combustion controls/amplifiers:
R4341/R7323
R4343/R7323
R4344/R7323
W
C7027A
2-
14
pipe.
C7035A
1
l-112
Pipe.
C7035A
Inc. requirements for raintightness and complies
with NEMA enclosure standards, types 4 and 4X.
C7044A
sensor tube is enclosed in a stainless steel housing.
Amplifiers and the appropriate Honey-
may also be used with the following 50 Hz
has an integral collar threaded (internal
NPSM)
has an integral collar threaded (internal
NPSM) for mounting on a one-inch sight
housing meets Underwriters Laboratories
mounts with a two screw bracket. The UV
and
C7044A
R7249A, R7290A, R7749B
for mounting on a one-half-inch sight
Flame Detectors
and
C7044A
in flame monitoring applications.
Because of their compact size, the
C7044A
mounting.
Properly installed, the
pressure rated for 5 psi.
l/
l-
C7035A
replaceable.
Two
tors can be wired in parallel for difficult flame
sighting installations.
CONTENTS
Specifications
Ordering Information
Installation
Adjustmentsand Checkout
Troubleshooting
Maintenance
has the capability of side or end viewing
C7027A
are particularly suitable for blast tube
C7027A
ultraviolet radiation sensor tube is field
C7027A, C7035A,
................................................,
or
....................................
and
C7044A
C7035A
Flame Detec-
......................................................
............................
............................................
.................................................
and
are
.2
.2
4
.7
IO
10
F.P. l Rev. 11-92
8
@Honeywell Inc. 1992 9 Form Number
60-2026-4
C7027A, C7035, C7044A
SPECtFlCATlONS
l
ORDERING
INFORMATlON
Specifications
SUPER TRADELINE MODELS
SUPER
on
TRADELINE
replace a widerange of Honeywell and competitive controls.
SUPER
provide ease of stocking, ease of handling, and maximum
replacement value. Specifications of SUPER TRADELINE
models are the same as those of standard models except as
noted below.
SUPER TRADELINE MODEL AVAILABLE:
C7027A10804 includes ClO27A1023
Heat Block, and 390427B Bushing.
SUPER TRADELNE FEATURES:
q
n
q
TRADELINE
models offer features not available
or standard models, and are designed to
TRADELINE
models are selected and packaged to
Detector, 136733
Heat block for insulating the detector from sight pipe
temperatures above 215” F
[102”
C] up to 266” F
1130” Cl.
Bushing for mounting the detector on a
3/8
in. sight
pipe.
SUPER TRADELINE pack with cross reference label
and Instructions, form 60-0638.
STANDARD MODELS
C7027A
DETECTOR
AMBIENT OPERATING
MAXIMUM PRESSURE RATING: 5 psi
MOUNTING: Collar with
MINIPEEPER ULTRAVIOLET FLAME
TEMPBRATURB
0”
F to
215O
F
E-18’
[-40” C to +
102’
C to 102”
C]
,
depending on model.
l/2-
C],
or 40” F to 215” F
14 NPSM internal threads for
mounting on a l/2 in. sight pipe.
RATINGS:
[34.5 kPa].
WIRING
CONNBCTIONS:
Two 6 ft [ 1.83
m],
color-coded,
NBC Class 1 leadwires. (One model is available with 24
ft
[7.32 m]
leadwires.) Rear of detector has a clamp type
connector for
l/Z?
in. flexible metallic conduit. (Models are
available with l/2 in. internally threaded spud connector
instead of the clamp.)
DIMENSIONS: See Fig. 1.
REPLACEMENT
PART: 129685 Flange Gasket.
NOTE: The ultraviolet radiation sensing tube is not field
replaceable.
ACCESSORY: 136733 Heat Block, laminated plastic, for
insulating the flame detector from sight pipe temperatures
up to 266” F
one end and
[130” Cl, l/2-14
l/2-14
NPSM internal threads on the other
NPSM external threads on
end (see Fig. 5).
Fig. l--#nstallation dimensions of
PM.
1
COLLAR WITH 112-14 NPSM
INTERNAL THREADS
MODEL AVAILABLE WITH 24 FOOT [7.32 METRE] l_EADWIRES.
1
n
MODELS AVAILABLE WITH SPUD CONNECTOR
2
n
THREADS) INSTEAD OF CLAMP
lYPE
CONNECTOR.
C7027A,
I
NPSMINTERNAL
(l/2-14
in in.
Ordering Information
When
purchasing
Catalog or price sheets for complete ordering number, and specify:
1. Order number. 2. Operating temperature range.
ORDER SEPARATELY:
1. Replacement
If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:
1.
2.
replacement and modernization
parts,
if desired.
Your local Honeywell Residential and Building Controls Division Sales Office (check white pages of phone directory).
Residential and Building Controls Division Customer Satisfaction
Honeywell Inc., 1885 Douglas Drive North
Minneapolis, Minnesota 554224386 (612) 951-1000
In Canada-Honeywell Limited/Honeywell Liiitee, 740 Ellesmere Road, Scarborough, Ontario
and Service offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan,
Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
products
from your Flame Safeguard Authorized Distributor, refer to the
2. Accessories, if desired.
MlP
TRADELINE@
2V9.
International Sales
2
C7027A, C7035, C7044A
SPECIFICATIONS
C7035AMINIPEEPERULTRAVIOLETFLAME
DETECTOR
FLAME
AMBIENT OPERATING
MAXIMUM
MOUNTING Collar with l- 1
WIRING
DIMENSIONS: See Fig. 2.
DETECTION: End viewing.
0”
F to
250’
F
[-18”
E-40” C to 121”
PRBSSURB
TBMPBRATURE
C to
121’ Cl,
Cl,
depending on model.
or 40” F to
RATING: 5 psi
l-1/2
NPSM internal threads
RATINGS:
250“
[34.5 kPa].
F
for mounting on a 1 in. sight pipe. (The DIN approved
C7035A1064
NBC Class 1 leadwires rated for 600” F
model is available with 12 ft.
has l-11
CONNBCTIONS:
BSP.Pl
Two 6 ft. [ 1.83
threads.)
ml,
[3.66 m]
leadwires. Rear of
color-coded
[204“ Cl.
One
detector has l/2- 14 NPSM internal threads for connecting
to a conduit. The DIN approved
C7035A1064
has
l/2-14
BSP-F threads.
Fig.
2-installation
dimensions of
C7035A,
in in.
[mm].
REPLACEMENT PARTS:
129808 Flange Gasket.
129464M Ultraviolet Sensing Tube, 0” F to 250” F
[-18” C to
121”
C].
129464N Ultraviolet Sensing Tube, -40” F to 250” F
[-4o”
c to
121° Cl.
C7027A
ANDC7035A
APPROVALS:
Underwriters Laboratories Inc. listed: File No. MP268.
Canadian Standards Association certified: Master Report
LR 95329-l.
Factory Mutual approved.
Industrial Risk Insurers acceptable.
DIN approved models:
C7027A1056, C7035A1049,
C7035A1064.
ACCESSORIES:
118367A
C7044A
Swivel Mount; provides adjustable positioning
of the
C7027A
or
C7035A.
MINIPEEPER ULTRAVIOLET FLAME
DETECTOR
DETECTION: Housing has two openings to permit either
sideorendviewing. Sideviewingis
118assensitiveasend
viewing.
DIN APPROVED C7035A1064 HAS l-11 BSP.Pl INTERNAL THREADS.
A
DIN APPROVED C7035AlC64 HAS
MODEL AVAILABLE WITH 12 FOOT [3.66
Fig.
3-hstallation
6 FOOT 11.63 METREI
l/2-14
BSP-F INTERNAL THREADS.
METRE]
dimensions of
LEADWIRES.
C7044A,
M,965
in in. [mm].
AMBIENT OPERATING
0”
F to 215” F
[-lS”
TEMPERATURB
C to
102’
C].
RATINGS:
MOUNTING: Bracket (included in 4074 BVK Bag Assem-
bly), secured by two 8-32 RHIS (European M-4) screws
(not included).
WIRING CONNECTIONS: Two6 ft.
[
1.83 m]
,color-coded,
NBC Class 1 leadwires. Rear of detector has a clamp type
connector for l/2 in. flexible metallic conduit.
DIMENSIONS: See Fig. 3.
MOUNTING BRACKET
\
3
60-2026-8
C7027A,
INSTALLATION
C7035,
C7044A
Installation
!
CAUTION
A
[
I
\
Ultraviolet radiation sensing tubes have a life expectancy of 40,000 hours of continuous use within
the flame detector’s specified ambient temperature
voltage
and
tion sensing tube results in failure of the UV sensor
to properly discriminate between flame conditions.
The
tors should only be used on burners that cycle on/off
periodically or, in
odically checked for proper operation.
Recommended industry standards for the frequency
of sensor checks, either through cycling (employing safe-start check methods) or periodic maintenance, vary between once every ten seconds and
once every week, depending on the standard used
and the application needs.
Consult the equipment manufacturer or the
ing standard for recommendations about frequency
of checks.
Controls incorporating safe-start checks, and sensors and controls employing constant check means
areavailablefrom
representative for specific information.
WHEN INSTALLING THIS PRODUCT..
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous
condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced, flame safeguard control technician.
4. After installation is complete, check out product
operation as provided in these instructions.
! CAUTION
A
I - 1
1.
The
tectors must be used with Honeywell flame
safeguard controls (primaries, programmers,
multibumer systems, and burner management
systems). Using
by Honeywell could result in unsafe conditions.
2.
Disconnect power supply before beginning installation to prevent electrical shock or equipment damage; more than one disconnect may be
involved.
Read
3.
the installation.
All wiring must be NEC Class 1 (line voltage).
4.
The flame detector must be positioned so that it
5.
sights the flame and does not respond to the
radiation emitted by sparks generated by a spark
ignitor. The
useful in difficult installations.
ratings.
C7027A, C7035A
C7027A, C7035A
the
installation instructions before starting
Wearout
the
Honeywell.
with
Q624A
of an
ultravioletradia-
and
C7044A
absence of cycling, are peri-
and
controls not manufactured
Solid-State Igniter may be
Flame Detec-
See
your
.
C7044A
Honeywell
Flame De-
govem-
W
BASIC REQUIREMENTS FOR ULTRAVIOLET
DETECTOR INSTALLATIONS
All flames emit ultraviolet radiation, invisible to
human eye but detected by the UV sensing tube. There are
two important factors in UV detector installation:
1. The detector must have a line-of-sight view of the
flame.
‘lbe
detector must not be exposed to other sources of
2.
ultraviolet radiation, the most common being ignition spark.
Other sources are listed in the next section.
Because it is necessary for the detector to actually see the
flame, it is desirable to locate the detector as closeto the flame
as physical arrangement and temperature restrictions permit.
Sighting requirements for different types of flame supervision are:
1. Pilot flame only---Sighting must be along the axis of
the
pilot flame. The smallest pilot flame that can be sighted
must be capable of igniting
Turndown Test, page 9).
2.
Main flame only-Sighting must be at
part of the flame for all
3. Pilotandmainflame-Sightingmustbeattbejunction
of both flames.
OTHER RADIATION SOURCES SENSED BY
UV DETECTOR
Examples of radiation sources (other than flame) that
could actuate the detection system are:
Ultraviolet Sources:
Hot refractory above 2800” F
Spark:
l
ignition transformers.
l welding arcs.
l lightning.
Gas lasers.
sun lamps.
Germicidal lamps.
Gamma Ray
Diffraction analyzers.
Electron microscopes.
Radiographic X-ray machines.
High voltage vacuum switches.
High voltage condensers.
Fmioscotopes.
Exceptunderunusualcircumstances,noneofthesesources
except hot refractory and ignition spark would be present in
or near
the
The detector may respond to hot refractory above 2800” F
[1371”
C] if the refractory surface represents a
t percentage
temperature of the hot refractory causes
flame safeguard control) to pull in, reposition the sight pipe
so the detector views a cooler area of the refractory.
ana’X-ray
combustion chamber.
of the field of view of
fting
rates.
Sources:
the
main burner (see Pilot
the
most stable
[1371” Cl.
the
detector. If the
the flame
relay (in the
the
THE
sign&can
4
C7027A, C7035, C7044A
INSTALLATION
Ignition spark is a source of ultraviolet radiation.
installing the
tor, make sure it does not respond to ignition spark (see
Ultraviolet Response Test, page 9.)
C70217A, C7035A,
or
C7044A
If
the
Flame Detec-
installation is such
that response to the ignition sparks cannot be avoided, the
Q624A
Solid-State Ignition Transformer may eliminate the
ignition spark response. The
stalled, prevents
C7027A, C7035A,
Q624A,
and
when properly in-
C7044A
When
ignition
NOTE: Ifyouuseaswivelmount(partno.
arepositive about the location and sighting angle, you can
permanently weld the pipe.
Fig.
spark response by alternately activating the spark generator
and the
MOUNTING A
W sensing
C7027A
tube.
OR
C7035A
LOCATE THE SIGHT PIPE
Thelccationofthesightpipeisthemostcriticalpartofthe
installation. A black iron pipe is recommended. Do
not use
a
stainless steel or galvanized pipe because its internal surface
blackens with use as deposits from the combustion chamber
settle on it. Initially, its shiny internal surface reflects ultraviolet radiation, which could result in a satisfactory flame
signal, even though the pipe may be improperly located. As
it blackens, less ultraviolet radiation is reflected
and
the flame
signal may become marginal.
Under optimum sighting conditions, the
C7035A
Flame Detectors can detect most common gas and
oil combustion flames at a distance of six feet. The critical
factors in determining the flame-detector distance separation
are the optimized flame signal (current or voltage) and the
flame detector temperature. Other factors may be influential
and are associated with the specific installation. For minimum flame signals, see Table 1 and for ambient operating
tempemtures, refer to Specifications, page 2.
Use
l/2
in. pipe for a
C7027
and 1 in. pipe for a
Since no two situations are likely to be the same, length and
sighting angle of the pipe must be determined at the time and
placeofinstallation.
Generally,itisdesirabletohavethesight
C7027A
C7035.
and
SIGHT PIPE VENTILATION
It may be necessary to ventilate the sight pipe to cool the
flame detector or to clear the sight pipe of UV radiation
absorbing substances such as smoke, excessive moisture or,
in some instances, unburned fuel.
For a negative pressure combustion chamber, drilling a
few holes in the section of the sight pipe outside of the
combustion chamber will allow
flow through the sight pipe into the chamber. A perforated
pipe nipple between the sight pipe and the detector can also
be used (see Fig. 5).
pipe tilting downward to prevent soot or dirt buildup.
lf
a
C7027A
is to be used for a blast tube installation, its
location should be determined by the burner manufacturer;
contact the manufacturer before making any modifications to
the installation.
ln
locations where water is usually sprayed on the body of
the detector, use a
C7035A.
Internal threads in its
base
permit
the use of waterproof flexible conduit for this type of application.
Wounting
FLARED HOLE
Fig. !&Mounting a
chamber (viewed from above).
ing is similar.
sight pipe.
air
C7027A
C7027A (OR C7035A)
on a combustion
at
atmospheric pressure to
C7035A
118367A)andyou
‘BLACK IRON
mount-
PREPARE HOLE IN WALL OF COMBUSTION
CHAMBER
Cut a hole of the proper diameter for the sight pipe in the
wallofthecombustionchamberattheselectedlocation.Flare
the hole to leave room for small adjustments of the sighting
angle. The taper of the hole should be about 1 in. for every 3
in.
125
mm for every 76 mm] of wall thickness.
A
P
N
s
FOR
IF REQUIRED.
MOUNTING THE SIGHT PIPE (PIG. 4)
Thread one end of the pipe to fit the mounting
collar
on
the
detector. Cut the pipe to the desired length (as short as
practicable), and at an angle so it fits flush with the wall of the
combustion chamber. Tack weld the pipe to the wall in a trial
position.
until after completing the Adjustments and Checkout beginning on page 7.
Do not permanently weld the sight pipe in place
5
VENTILA
COMBUSTION
60-2026-8
C7027A, C7035, C7044A
INSTALLATION
Fig.
6-Mounting
-
I
dimensions of 136733 heat block, in in. [mm].
136733 HEAT BLOCK
C7027A
DETECTOR
4tm
-
-b
I
-7
l/P-INCH SIGHT PIPE
b-14 NPSM
INTERNAL
THREADS
HIGH TEMPERATURES (ABOVE 215” F
DO NOT USE FOR TEMPERATURES ABOVE 266” F
For a positive pressure combustion chamber, connect a
supply of pressurized air from the burner blower through the
sight pipe into
the
chamber.
The
supply air pressure must be
greater than the chamber pressure.
SWIVEL MOUNT
To facilitate proper sighting of the flame, a swivel mount
(part no. 118367A) is available. The swivel mount will
require a
mount a
long to mount a
3/ 4
to l/ 2 in. reducer and a
C7027A,
or a 1 in. pipe at least
C7035A.
For mounting details, refer to form
l/ 2
in. close nipple to
2-l/ 2
in. 163.5 mm]
60-0361 for the 118367A Swivel Mount.
USING A HEAT BLOCK WITH A
C7027
(Fig. 6)
If the temperature of the sight pipe will become high
enough to cause the
Cl up to 266” F [
C7027A
130’ Cl,
to overheat (above 215” F [
screw
a 136733 Heat Clock (order
102’
separately) onto the sight pipe before mounting the detector.
MOUNT THE DETECTOR (Fig.
Mount
the
detector onto the sight pipe, pipe tee, nipple, or
other
fitting . Make sure the flange gasket is in place inside the
mounting collar on
the
detector, and then screw the collar
5)
onto the sight pipe or fitting.
b/2-14 NPSM
EXTERNAL INTERNAL
THREADS
Fig.
\ l/2-14
NPSM
THREADS
[102’ Cl)
[13O”C]
7-Mounting C7044A
Mf942
on blast tube.
CLAMP
SCREW
NOTE: If a window is installed between the
the
flame, it must be fabricated from quart z or
UV
detector and
fused
silica.
Ordinary glass filters out ultraviolet radiation.
MOUNTING A
The
C7044
C7044A
ON A BLAST TUBE (Fig. 7)
is designed to be mounted on the blast tube of
a burner. The exact location should be determined by the
burner manufacturer. Contact the manufacturer before making any modifications to the installation.
I
CAUTION
.
n
The
C7044
will allow air leakage through its
housing. It should not be located in a n atmo-
sphere of fuel vapors under positive pressure.
The
C7027
or
C7035
should be used if internal
pressure
sealoff
is required.
C7027A, C7035, C7044A
INSTALLATION l ADJUSTMENTS AND CHECKOUT
TheC7044ismountedina29/32in.
blast tube. The mounting bracket is fastened to the blast tube
with 2 screws on
The mounting bracket is designed so that the detector can
be
removed
without disturbing the sighting angle. Loosen the 2 screws
holding the bracket to the blast tube, but do not loosen the
clamp screw on the bracket. Twist both the bracket and
detector to remove them.
WJfING
(All Models-Fig. 8)
l-27/64
in.
[36.1
from the blast tube for cleaning and then replaced
[23.0mml
mm] centers.
holeinthe
[-la” C], limit the minimum ambient temperature at the
detectors to
minimum of
temperature at the detectors to
terminal of the wiring subbase or terminal strip, and the white
leadwires of both detectors to the G terminal, as shown in
Fig. 8.
/!\ Caution
The blue (tan with blue tracer with
leadwire
flame safeguard control subbase or terminal strip
and the white (tan
C7035A1080)
1. Disconnect power supply before beginning installation to prevent electrical shock and equipment damage. All
wiring must comply with applicable electrical codes, ordinances, and regulations. Use
2. If the leadwires are not long enough to reach the
terminal strip or wiring subbase, make the required splices in
a junction box.
3. If splicing is necessary, use moisture-resistant wire
suitable for at least 167°F [7PC] if the detector is used with
a flame
if used with a flame safeguard programming control.
Specification no. R1298020 or equivalent for the F leadwire.
(This wire is rated up to 400” F
It is tested for operation up to 600V and breakdown up to
7500V.) For the other leadwires, use moisture-resistant wire
selected for a temperature rating above the maximum operating temperature.
safeguard
4. For high temperature installations, use Honeywell
must be connected to the F terminal of the
leadwire
without blue tracer with
totheGterminal(seeFig.
to observe the circuit polarity by reversing the
leadwires {even momentarily) may cause the flame
detector to improperly supervise the combustion
flame.
NEC
Class 1 wiring.
primary
control, or at least 194” F
[204O C]
C7035A1080)
8).Failure
[90” C]
for continuous duty.
EARTHGROUND
connected to earth ground. A convenient method of accomplishing this is to connect the detector to the flame safeguard
control with a flexible conduit, or ensure a good
connection at the mounting bracket.
When using detectors rated for a minimum of 0’ F
32”
F [0” C]. When using detectors rated for a
40”
F
r-40” Cl,
Connect the blue leadwires of both detectors to the F
Fig.
S-Wiring C7027A, C7035A,
flame detectors in parallel.
OPTIONAL
SECOND
DETECTOR
The detector and the flame safeguard control must be
limit the minimum ambient
-10”
F [-23”
0
I
Cl.
and
C7044A
WIRING SUBBASE
TERMINAL STRIP
h43018
ground
Adjustments and
Checkout
IMPORTANT:
same conduit with high voltage ignition transformer
wires.
CONNECTING DETECTORS IN PARALLEL
For a flame that is difficult to sight, using two flame
detectors connected in parallel will reduce the occurrence of
nuisanceshutdowns. Ifonlyoneoftheparalleldetectorsloses
the flame signal, the other will continue to indicate the
presence of the flame and keep the burner in operation.
When the flame detectors are connected in parallel, the
low level background signals are additive. Therefore, no
more than two
tors
shouZd
increases as temperature decreases. Because of this, the
minimum ambient operating temperature must be increased
when the
paralled.
Do not run
C7027A, C703SA,
be
purulled.
C7027A, C7035A
Furthermore, the background signal
thejlame
or
or
C7044A
detector wiring in the
C7044A
Flame Detec-
Flame Detectors are
7
Before welding the
final location, or &fore tightening the
complete both the adjustments
and any required by the burner manufacturer.
UV SENSOR TUBE TEST
NOTE: For initial burner lightoff, consult the burner manu-
facturer instructions or the instructions for the flame
safeguard control.
During the initial burner lightoff, make sure the flame
safeguard control starts (i.e., the
in). If it
C7027A, C7035A,
continues to glow when no flame is present, replace the
sensing tube
C7044A).
does
not start, visually check the sensing tube in the
(C7035A),
or
C7044A
C7027A
or
C7035A
C7044A&&
and
checkout tests that follow
-
load
relay, usually lK, pulls
flame detector. If the tube
or replace the detector
sight
(C7027A
60-2026-8
uiue
in its
screw,
or
C7027A, C7035,
ADJUSTMENTS AND CHECKOUT
C7044A
ADJUST DETECTOR SIGHTING POSITION
With
the
flame detector installed and burners running,
controls have the optional Keyboard Display Module, a zero
to five Vdc reading will be displayed on
adjust the position of the flame detector for optimum flame
signal. The flame signal will be read in microamps or voltage
(Vdc)
depending on the Honeywell flame
safeguardcombus-
tion control used.
Most existing Honeywell flame safeguard controls incorporate a flame current jack on the flame amplifier or on the
control itself.
ohmmeter such as
The
flame signal can be measured
the
Honeywell
W136A.
To measure the
with
a
volt-
flame current (signal), use a cable connector (part number
196146, included
meter. With the
with
W136A
the
W136A)
(or
equivalent)
in conjunction
with
positionedat the zero
the
to 25 microampere scale, make connections from the meter
probes to the two ends of the cable connector plug (red to red,
black to black). Make these connections before inserting the
plug end of the connector plug into the flame jack of the
control or control amplifier (see Fig. 9a). Read the flame
signal in microamperes directly from the
Refer to Table 1 for
The
R7749B
the
minimum acceptable flame currents.
and
R7849A,B
Amplifiers used with the
W136A
meter.
Honeywell BCS 7700 and 7800 SERIES controls, respectively, have a dc voltage
For the
R7749B
to 5 or 10 Vdc scale and a minimum sensitivity of 20,000
volts/ohm is suggested.
For
theR7849A,B
flame
signal output.
Amplifier, a volt-ohmmeter with a zero
Amplifiers used with
the
7800 SERIES
Fig. Sc-kleasuring flame signal voltage of 7900
SERIES controls.
controls, a volt-ohmmeter with a zero to 5 or 10 Vdc scale and
a
minimum
(see Fig.
sensitivity of one megohm/volt is recommended,
SC).
Measure the flame signal voltage as illustrated in Figs. 9b
and
9c.
Be careful to connect the positive meter lead to the
positive
negative
a
(+)
amplifier jack and the negative meter lead to
(-)
amplifier jack
7800
SERIES control. If the BCS 7700 and SERIES 7800
(BCS
7700) or the (-Corn) jack for
the
the
module.
Fig. Sb-Measuring the BCS 7700 flame signal
voltage.
-
20,000
VOLT/OHM
METER
e
e
v
METER
BCS 7700 CHASSIS MODULE FOOTMOUNT
PROSES
AMPLIFER
EZ512A
Fig.
Sa=-Measuring microamp
METER
LEAD
flame signal.
PLUG-IN FLAME
SIGNAL AMPLIFIER
196146 METER
RED CONNECTOR
Move
the
flame detector and sight pipe (if not perma-
nently attached to
the
burner/boiler) to view the flame from
various positions. Allow a few seconds for the meter reading
to stabilize. A maximum steady
microamp
or voltage reading
is desirable. The flame signal must be above the minimum
acceptable level for
the
flame safeguard control and associ-
ated amplifier as indicated in Table 1.
Measure
burner flame alone, and
the
flame signal for
both
the
pilot alone, the main
together (unless monitoring
pilot only when using an intermittent pilot or supervising the
main flame only when using direct spark ignition). Also,
measure the flame signal at low and high firing rates and
while modulating (if applicable).
8
C7027A, C7035, C7044A
ADJUSTMENTS AND CHECKOUT
With the
signals must be steady with a current/voltage value as
cated
in Table 1. If the minimum signal cannot be obtained or
is
unstable, refer to Troubleshooting,
llame
detector in its final position, all flame
page
10.
TABLE
indi-
-1
l-
FLAME
CI-IECK~)
R7249A
R4075C,D,B
R4138C,D
R414OG,L,M
R7290A
None
I
I
R7849A
R7849B
(AMPLI-
CHBCKm)
or
R4795A,D
R7023C,
1 R7795A,C$,G
RM78OOE,G,L,M
A
A,B _
&
PILOT TURNDOWN TEST
Ifthedetectorisusedtoproveapilotflamebeforethemain
fuel valve can be opened, perform a Pilot Turndown Test.
Follow the
procedures
in both the Instructions for the appropriate flame safeguard control, and in the burner
manufacturer’s instructions.
SIGNAL.
Minimum
Acceptable
Steady
Current
Maximum
Current
Expected
(microamps) (microamps)
3.5
1.5
7.5
I
1
2.25
1.25
1.25
1.25
1.25
1.25
1.25
1.25
5.0
5.0
5.0
5.0
5.0
5.0
5.0
ULTRAVIOLET RESPONSE TESTS
IGNITION SPARK RESPONSE TEST
Test to be
sure
that
ignition spark is not actuating
the
flame
relay (usually 2K) in the flame safeguard control.
1. Close the pilot and main burner manual fuel shutoff
valves.
2. Connect
the
appropriate meter to the flame safeguard
control amplifier. Start the burner and run through the ignition period. Ignition spark should occur, but
the
flame relay
RESPONSE TO OTHER ULTRAVIOLET
SOURCES
Some sources of artificial light produce small amounts of
ultraviolet radiation. Under certain conditions, an ultraviolet
detector willrespond to them as if it is sensing
use an
ultraviolet detector.
operation, test for flame failure response under all operating
conditions.
must not pull in. The flame signal should not be more than
0.25 microamp.
3. If the flame relay does pull in, reposition the flame
detector to increase the distance between the flame detector
and the ignition spark. If the flame detector is not in the line
of sight of the ignition spark but appears to respond to the
spark, it may be responding to reflected spark generated
W
WELD THE SIGHT PIPE
Clamp Screw)
When the flame signal is
are made, remove the flame detector and weld the sight pipe
in its final position. If you are using a swivel mount, the pipe
may already be welded. Then reinstall the flame detector.
radiation. If so, relocate the flame detector so it does not
receive the reflected
IJV
radiation. It may be necessary to
construct a barrier to block the UV radiation generated by the
NOTE: If using a
remove the detector; tighten
spark from the flame detector view.
4. Continue making the adjustments until the flame sig-
nal due to ignition spark is less than 0.25
microamp
or
1.25 Vdc.
5.
The use of the
Q624A
solid-state ignition transformer
mayalsoprovideamethodtoeliminatetheC7027A,C7035A,
or
C7044A
ated by ignition spark. The
flame detector response to UV radiation gener-
Q624A
prevents flame detector
FINAL CHECKOUT
Before putting the burner into service, check out the
installation using the procedures in the Checkout section of
the Instructions for the appropriate flame safeguard control.
Aftercompletingthecheckout,runthebumer throughatleast
one complete cycle to verify correct operation.
response to ignition spark by providing alternating periods of
spark generation and UV sensor activation.
ar@ciaI
aflameDo
light source to check the response of an
To check for
(or Tighten the
accep,table
C7044A
Detector with no sight pipe, do not
proper
flame detector
C7044A
after all adjustments
the
clamp screw securely.
not
60-2026-8
C7027A, C7035, C7044A
TROUBLESHOOTING . MAINTENANCE
!
CAUTION
A
I - 1
1. Be extremely careful while troubleshooting the
detector; line voltage is present on some of the
terminals when power is on.
2. Open the master switch to disconnect power
before removing or installing the detector.
INADEQUATE FLAME SIGNAL
If a satisfactory flame signal cannot be obtained while
adjusting the sighting position of the detector, perform the
procedures indicated in steps 1 through 7.
are encountered in the system,
Instructionsfor the appropriate
control.
1.
Check for proper line voltage. Make sure the master
switch is closed, connections are correct, and power supply
is the correct voltage and frequency.
2. Check the detector wiring for defects, including:
incorrect connections.
wiring type or size of wire.
deteriorated wire.
open circuits.
short circuits.
leakage paths caused by moisture, soot, or dirt.
refer to
Troubleshooting
Honeywellflame sc&eguard
Bother
difficulties
in
the
Troubleshooting
3.
With the burner running, check the temperature at the
detector. When it exceeds
C7044,
or 250” F 1121” Cl for a
useaheatblock(&tno. 136733)
Flame Detector.
addtheadditionalinsulationbetweenthewallofthe
combustion chamber and the detector.
add a shield or screen to reflect radiated heat away
from the detector, or
add cooling (refer to Sight Pipe Ventilation,
page 5).
4. Remove the detector and clean the viewing window
with a soft, clean cloth.
5.
Clean the inside of the sight pipe (if one is used) before
reinstalling the detector.
6.
If the flame signal continues to be too low, replace the
plug-in amplifier (if the control has one).
7.
If you still cannot obtain a proper flame signal, replace
flame detector
tube
(C7035A).
IMPORTANT:
sure to perform the Adjustments and Checkout begin-
ning on page 7.
(C7027A, C7044A)
At the completion of troubleshooting, be
215’
F [
102’
C] for a
C7035:
ifusingaC7027A
or UV radiation sensing
C7027
or
PERIODIC MAINTENANCE
1. Clean the viewing window and sight pipe (if used)
when necessary. Remove the detector and use a soft, clean
cloth to remove accumulated contaminants from the
radiation sensor tube glass envelope.
3. Ultraviolet sensing tubes have a life expectancy of
40,000 hours of continuous use within the ambient temperature and voltage ratings. Replace the sensing tube in the
C7035,
or replace the
ate intervals.
3. Keep the flame detection system adjusted for the
smoothest, most reliable operation as recommended by the
burner manufacturer.
C7027
or
C7044
Detector, at
UV
appropti-
Maintenance
CLEANING THE C7OaA DETECTOR
When necessary, clean the
using the following procedure:
1. Loosen the two screws holding the
bracket to the blast tube. To remove, twist the bracket and
detector.
mounting bracket to the detector.
realign it, twist against the mounting screws.
Do not
2. Clean the viewing window with a soft, clean cloth.
3. Insert the detector into the mounting hole, and to
4. Tighten the two mounting screws.
loosen the clamp screw that holds the
C7044
Flame Detector by
C7044
mounting
10
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