Honeywell R4348B Product Handbook

1 EN1C-9999SZ22 R1104

R4348B

INDUSTRIAL FLAME SWITCH

PRODUCT HAND BOOK

APPLICATION

The R4348B flame switch is for application in large com­mercial and industrial burner installations.
The function is:

flame safeguard primary controls capable of providing
system „safe start“ check and flame sensing functions.

The unit can also be used in installations using an EC7800
microcomputer-based burner control system - to extend the
number of burners being controlled.

The unit includes a 3-pole flame relay which is energized when
flame is sensed and de-energized when „no-flame“ is sensed
and a 3-pole line voltage „load relay“.

• Standard is a green LED which is illuminated when the
flame relay is energized.

• R4348B1057 only:
– LED bar and 4-20mA output for indicating and / or

recording the flame current strength.

• Unpowered relay outputs enable Honeywell sensors
and amplifiers to be used with a wide range of logic
schemes according to customer needs.

• Plug-in unit makes wiring and servicing easy.

• Plug-in flame signal amplifiers available to match a wide
range of flame sensors.

EN1C-9999SZ22 R1104 2

SPECIFICATIONS

WARNING

To avoid the risk of electrical shock which could
cause personal injury, follow all safety notices in this
documentation.

MODEL:

R4348B industrial flame switch with 3-pole flame relay
and 3-pole load relay

1)

see OPTIONS also

ELECTRICAL RATINGS:

can operate on 110V - 120V - 127V - 230V 50/60Hz

POWER CONSUMPTION:

less than 15VA

ENCLOSURE:

IP40 or IP54 depending on the model and base

AMBIENT TEMPERATURE LIMITS:

Operating: - 20°C to + 60°C.
Storage: - 40°C to + 80°

CLASSIFICATION:

OOCRXB

APPROVALS:

Installation and cabling for both intermittent and
continuous operations must be in accordance with
relevant standards (i.e. EN298)

OPTIONS: (see MODELS also)

LED-METER. A series of color coded LED’s on the face of
the unit which give a direct indication of flame current
strength.
Green LED’s indicate normal flame current strength. Yellow
LED’s indicate marginal signals. Red LED’s indicate
unsatisfactory flame signal strength (see fig. 2).

4-20mA OUTPUT. The flame current value can be
registered and/or displayed at a local or remote location.
Load : 0 to 750Ω.

.

CONTACT RATINGS:

If more than one safety shut-off valve is to be actuated by
the R4348 it is recommended to use separate relay contacts
rather than paralleling from one contact.

MAXIMUM RELATIVE HUMIDITY:

90 % RH at 40oC (not to exceed saturation point)

WEIGHT : 1,5 Kg

FLAME SENSORS AND AMPLIFIERS :

will accept any of the plug-in amplifiers and appropriate
sensor listed .

FLAME INDICATION :

Green LED on face of unit when illuminated indicates
presence of flame. Relay contact enables remote indica­tion of flame presence to be made.

MOUNTING :

Can be wall, DIN rail of panel mounted.

Subbase: 46176612-501

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3 EN1C-9999SZ22 R1104

FIG. 1 Dimensions in mm.

FIG.2 Main features

ACCESSORIES:

Subbase : 46176612-501 : for IP40 (to be ordered separately)

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EN1C-9999SZ22 R1104 4

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1) Dynamic Self Check circuitry tests all electronic compo­nents in the flame detection system (amplifier and
detector) 60 to 120 times/min. during burner operation
and shuts down the burner if the detection system fails.

2) Circuitry tests only the flame signal amplifier during bur­ner operations and shuts down the burner if the ampli­fier fails.

3) Order flame rod separately, see instruction sheet for the
holder

4) Use Honeywell photocell. Part No 36316 only.

5) C7012E, F and C7076A shutter operation causes fluc­tuations in the current reading. Read the average stable
current - disregard peaks.

FLAME DETECTION SYSTEM:

5 EN1C-9999SZ22 R1104

INSTALLATION

IMPORTANT

1 The installer must be a trained, experienced flame

safeguard technician.

2 When installing the subbase and R4348 industrial

flame switch refer to the instructions provided by the
burner manufacturer. When these are not available
follow the instructions packed with the product.

3 Disconnect power supply before beginning the

installation.

MOUNT THE SUBBASE

The R4348 industrial flame switch can be wall, DIN rail of
panel mounted. When panel or DIN rail mounting the R4348
the appropriate kit must be ordered separately.

WIRE THE SUBBASE

1 All wiring must comply with local codes ordinances and

regulations.

2 Ensure that loads do not exceed the terminal ratings.

SELECTING THE OPERATING VOLTAGE

To match the R4348 to the supply line voltage, select the
proper terminals and the internal connector position per the
following table.

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To have access to the internal connector, remove the 4 cover
retaining screws and slide out the PC board.

EN1C-9999SZ22 R1104 6

INSTALL THE FLAME DETECTOR

The performance of the flame safeguard system depends
upon correct flame detector installation. Refer to the
instructions packed with the flame detector and also the
burner manufacturer’s instructions for details. (See also
figure 4).
Keep the flame signal leadwires from the flame detector to
the wiring subbase as short as possible. Capacitance
increases with leadwire length, reducing the signal
strength. The maximum permissible leadwire length
depends on the type of flame detector, leadwire, and
conduit. The ultimate limiting factor in the flame signal
leadwire length is the flame current.

MEASURING FLAME CURRENT STRENGTH

Flame current is measured/recorded in different ways
according to the model selected

1 It can be measured conventionally using a micro-

ammeter which is plugged into a jack socket on the
face of the R4348B.

2 It can be displayed/recorded locally or remotely when

the 4-20mA output model is taken.

3 Visually presented on the face of the unit by means of

color coded LED’s.

The customer can choose a model which includes two
methods of flame current measurement. e.g. Flame current
jack socket for local testing by a service technician plus 4­20mA output for remote indication.

PLUGGING THE R4348 INTO THE SUBBASE

1 Plug the selected amplifier into the back of the R4348

(see fig. 3).
Make sure the correct combination of amplifier and
flame detector is used.

2 Check that wiring connections are correct and that all

terminal screws are tight.

3 Plug the chassis into the subbase and tighten the two

captive screws.

4 In case of B1057 model, plug the cable into the back-

side of the amplifier.

FIG. 3 Installing a plug-in flame current amplifier

7 EN1C-9999SZ22 R1104

Wires are identified by color code as follows :
0=black
4=yellow
6=blue
9=white

FIG. 4 Flame detector wiring diagrams

EN1C-9999SZ22 R1104 8

FIG. 5 Industrial flame switch - terminal location

9 EN1C-9999SZ22 R1104

CHECK OUT AFTER INSTALLATION

INSTALLATION CHECKOUT

Preliminary inspection - make certain that :

1 System overload protection is correct (5A max.).

2 Wiring connections are correct and all terminal screws

tight.

3 Flame detector installation is complete.

4 The correct flame detector is used. Refer to table page 5.

5 Burner is completely installed and ready to fire with the

fuel lines purged of air.

6 Combustion chamber and flues are clear of fuel.

7 Power is on at the system main switch.

FLAME DETECTOR CHECKOUT

The best guide to the performance of a flame detector is
given by the FLAME CURRENT value.
The expected maximum and minimum values of flame current
for the various types of flame detectors are given in the table
page 12.
Note that the following have an influence on flame sensing
performance :

1 Position, size and burning characteristic of the flame.

2 Refractory - when refractory temperature exceeds

1370C/2500F some ultraviolet radiation may occur.
Lower refractory temperature may affect photocells.
See relevant data sheets.

3 Temperature at flame detector

- Flame rods : ensure suitable rod is being used

- Other detectors : see relevant data sheet.

The R4348B has the possibility of measuring / recording the
flame current value in various ways, as follows :
(see also MODELS).

1 Using a Honeywell W136A micro-ammeter which is

plugged into a socket on the face of the R4348.

2 By reference to an LED-meter on the face of the R4348

which gives the value “at-a-glance”.

3 By relaying the current to existing customer recording/

indicating equipment.

HOT REFRACTORY TEST

In applications using caesium oxide detectors (rectifying
photocells) it is important to determine that hot refractory
does not simulate a flame after the end of normal run. If this
happens a flame condition is simulated after the real flame is
extinguished and a system restart is made impossible.

Test for this condition by operating the burner until the
refractory reaches maximum temperature and then stop the
burner fuel supply. At this point the flame current should
drop below 1mA, followed by a lockout within 0,8 to 1 second.
If this does not happen the photocell may be influenced by
the hot refractory.

THIS CONDITION MUST BE CORRECTED.

Try sighting the photocell at a cooler and/or more distant
refractory background. If that does not eliminate the trouble
try adding an orifice of filter to the detector. Continue to adjust
and test until the hold-in problem is eliminated.

NOTE : Repeat all flame detector tests after ALL adjustments
have been completed. All tests must be satisfied at the FI­NAL flame detector position.

PILOT TURN-DOWN TEST

Ensure that any pilot which can be detected by the flame
sensing system is powerful enough to light the main burner
reliably.

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