L404F,T,V
PressureTrol® Controllers
FEATURES
• Models available in a series of control ranges, and
pressure scales in kPa and psi.
• All models automatically reset and have an adjustable
differential.
• Models have snap switch to open or close a circuit on
a pressure rise.
• Case has a clear plastic cover so setpoints can be
observed.
• 1/4 inch—18 NPT connection for pipe on diaphragm
assembly.
• Ground screw terminal.
L404F:
PRODUCT DATA
APPLICATION
L404F PressureTrol® Controllers provide operating control
with automatic limit protection for pressure systems of up to
2070 kPa, or 300 psi.
®
L404T,V PressureTrol
systems for pressures up to 1035 kPa or 150 psi.
Controllers are for use on oil burner
• Controllers may be used with steam, air, or
noncombustible gases, or fluids noncorrosive to the
pressure sensing element.
L404T:
• High pressure limits, break a circuit on oil pressure
rise above setpoint.
L404V:
• Low pressure limits, makes a circuit on oil pressure
rise above setpoint.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 4
Settings and Adjustments ................................................. 6
Checkout .......................................................................... 7
71-2429-06
L404F,T,V PRESSURETROL® CONTROLLERS
SPECIFICATIONS
Model:
L404F,T,V PressureTrol
®
Controllers. See Table 1.
Table 1. Models with kPa—psi and Other Pressure Scales.
Maximum Diaphragm
pressure
Model Number
Operating Ranges Subtractive Differential
a
kPa psi kPa psi kPa psi
L404F1060 15 to 100 2 to 15 15 to 40 2 to 6 170 25
L404F1078 35 to 350 5 to 50 40 to 100 6 to 14 590 85
L404F1094 140 to 2070 20 to 300 140 to 345 20 to 50 2410
350
L404F1102 70 to 1035 10 to 150 70 to 150 10 to 22 1550 225
c
L404F1219
L404F1243
L404F1227
L404F1235
L404F1300
15 to 100 2 to 15 15 to 40 2 to 6 170 25
c
35 to 350 5 to 50 40 to 100 6 to 14 590 85
c
70 to 1035 10 to 150 70 to 150 10 to 22 1550 225
c
140 to 2070 20 to 300 140 to 345 20 to 50 2410
c
415 to 1240 60 to 180 40 fixed 6.0 Fixed 1550 225
350
L404F1326 0 to 100 0 to 15 15 to 40 2 to 6 170 25
L404F1334 0 to 350 0 to 50 40 to 100 6 to 14 590 85
L404F1342 35 to 1000 5 to 145 70 to 150 10 to 22 1550 225
L404F1359 70 to 2000 10 to 290 140 to 345 20 to 50 2410
350
L404F1367 7 to 55 1 to 8 5 to 14 0.75 to 2 170 25
d
L404F1375
L404F1383
L404F1391
L404F1409
L404F1441
35 to 350 5 to 50 40 to 100 6 to 14 590 85
d
70 to 1035 10 to 150 70 to 150 10 to 22 1550 225
d
140 to 2070 20 to 300 140 to 345 20 to 50 2410
d
15 to 100 2 to 15 15 to 40 2 to 6 170 25
0.35 to 3.5 Kg/cm
2
5 to 50 psi
0.4 to 1.0 Kg/cm
2
6 to 14 psi
6 Kg/cm
350
2
85 psi
L404T1055 35 to 350 5 to 50 40 to 100 6 to 14 590 85
L404T1063 70 to 1035 10 to 150 70 to 150 10 to 22 1550 225
d
L404V1087
L404V1095
a
Nominal at midscale operating range.
b
Brass bellows instead of stainless steel diaphragm.
c
Models with 1/4-19 BSPT thread instead of 1/4-18 NPT thread.
d
Make-on-rise models with terminal B omitted for miswiring compliance.
70 to 1035 10 to 150 70 to 150 10 to 22 1550 225
d
35 to 350 5 to 50 40 to 100 6 to 14 590 85
b
b
b
b
ORDERING INFORMATION
When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the
TRADELINE® Catalog or price sheets for complete ordering number.
If you have additional questions, need further information, or would like to comment on our products or services, please write or
phone:
1. Your local Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, Ontario M1V 4Z9.
International Sales 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.
71-2429—06 2
L404F,T,V PRESSURETROL® CONTROLLERS
3-3/4
(95)
1-1/16 (27)
13/16 (21)
1-3/16
(30)
HOLE FOR
1/2 INCH
CONDUIT
DIFFERENIAL
ADJUSTMENT
SCREW
1-1/2 (38)
2-1/8 (54)
M19635B
1-13/16
(46)
4-1/2 (115)
4-11/32 (111)
1-61/64 (50) 1-15/16 (49)
3/16 X 11/32
(5 X 9)
KNOCKOUT
MAIN SCALE
ADJUSTMENT
SCREW
1/4 –18 NPT
CLEAR
PLASTIC
COVER
3-7/8
(99)
2-3/4 (70)
3-1/4 (83)
DIMENSION
"A"
(SEE TAB)
1
1
1 15 TO 100 kPa (2 TO 15 PSI) SCALE MODELS ONLY.
PSI
RANGE
2 TO 15
5 TO 50
10 TO 150
20 TO 300
DIMENSION
"A"
123
126
126
146
Table 2. Conversion Table.
Operating Range Conversions Subtractive Differential Conversions
kg/cm
2
kPa psi kg/cm
2
kPa psi
0.1 to 1.05 15 to 100 2 to 15 0.15 to 0.4 15 to 40 2 to 6
0.4 to 3.5 35 to 350 5 to 50 0.4 to 1.0 40 to 100 6 to 14
0.7 to 10.0 70 to 1035 10 to 150 0.7 to 1.6 70 to 150 10 to 22
1.5 to 20.0 140 to 2070 20 to 300 1.5 to 3.5 150 to 300 20 to 50
Table 3. Switch Ratings (Amperes).
Switch State 120 Vac 240 Vac
Full Load 8.0 5.1
Locked Rotor 48.0 30.6
Pressure Sensing Element: Stainless steel diaphragm (140
to 2070 kPa models) has brass bellows.
Maximum Ambient Temperature: 66°C (150°F). Also, refer
to note under Mounting.
Adjustment Means: Screws on top of control case. Scales are
marked in psi or kPa.
Mounting Means: 1/4 inch-18 NPT connection on diaphragm
assembly; or surface mounts using holes in back of case.
Dimensions: See Fig. 1.
Switching Action: Snap switch breaks R-B (closes R-W) on
pressure rise. Make-on-rise devices omit terminal B.
Grounding Means: Ground screw terminal marked with a
circled ground symbol.
Accessories:
50024585-001 Brass Steam Trap. (Please refer to the applica-
ble Equipment/Application Standards for compliance.)
14026 Steel Steam Trap. (Please refer to the applicable Equip-
ment/Application Standards for compliance.)
118023 Steel Steam Trap for BSPT Models.
33312B Knurled Knob—fits on top of adjusting screws.
4074BWJ Range Stop—range stop screw, Part No. 107194,
and wrench, Part No. 23466, to limit setpoint range.
Approvals:
Underwriters Laboratories Inc. Listed: file no. MP466, vol. 10,
guide no. MBPR.
Canadian Standard Association certified: file no. LR1620,
guide no. 400E-0.
Fig. 1. L404F,T,V approximate dimensions in inches (millimeters in parentheses).
3 71-2429—06
L404F,T,V PRESSURETROL® CONTROLLERS
3885
INSTALLATION
When Installing This Product…
1. Read these instructions carefully. Failure to follow them
could damage the product or cause a hazardous
condition.
2. Check on the ratings given in the instructions and
marked on the product to make sure the product is
suitable for your application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out the product
operation as provided in these instructions.
IMPORTANT
Location and Mounting (L404F)
Locate the L404F where the ambient temperature will not
exceed 66°C (150°F). The L404F can be mounted near the
pressure gauge, at a remote location, in a fitting provided by
the boiler manufacturer, or in a special mounting on low water
cutoffs. The L404F should always be mounted above the water
line in steam boiler applications.
NOTE: For accurate operation, supplemental heat should be
A steam trap must be connected between the L404F and the
boiler (see Fig. 2) to prevent boiler scale and corrosive vapors
from attacking the elbows or diaphragm.
When making pipe connections, use pipe dope
sparingly to seal the joints; any excess dope may clog
the small hole in the fitting and prevent the controller
from operating properly.
added to installations where temperatures fall below
-29°C (-20°F).
PRESSURE
CONTROLLER
PRESSURE
GAUGE
Pressure Gauge Mounting
To mount beside a pressure gauge, remove the gauge, and
install in its place the steam trap with a tee on top. Mount the
PressureTrol® unit and pressure gauge on the side of the tee
by means of nipples and elbows (see Fig. 2).
Remote Mounting
Excessive vibration at the boiler may affect the operation of the
L404F. In these cases, the L404F should be remotely located,
subject to the following:
1. All piping must be suitable and properly pitched to drain
all condensation back to the boiler.
2. The remote mounting must be solid.
3. A steam trap must be used at one end of the piping.
Boiler Mounting
If it is not convenient to mount the L404F adjacent to the
pressure gauge, install a steam trap at the location
recommended by the boiler manufacturer, then screw the
device directly to the steam trap.
Location and Mounting (L404T,V)
Location
NOTE: For most accurate operation, supplemental heat
should be added to installations where the
temperature falls below -20°F (-29°C).These
controllers can be mounted at any location in the oil
supply line, depending on the application. Typical
locations are shown in Fig. 3. The low oil pressure
controller should be located upstream from the safety
shutoff valve(s). In a downstream location, there
would be zero pressure when the burner is not
running and the safety shutoff valve(s) is (are) closed.
This could prevent startup or require manual reset
every time the burner is started. The high oil pressure
controller should be located as near to the burner as
possible.
TEE
STEAM TRAP
4-1/2 TO 5-1/2
(114.3 TO 139.7)
BOILER
1
1/4 IN. PIPE WITH 1/4 - 18 NPT EXTERNAL THREADS
ON BOTH ENDS AND 2-1/4 IN. DIAMETER LOOP.
(SIPHON LOOP)
1
M2
Fig. 2. Steam trap mounting.
71-2429—06 4
Mounting
Mount the oil pressure controller directly on the main pipe.
Insert a tee in the pipe line, and connect a pipe nipple of
appropriate size to the tee (see Fig. 4). Screw the hexagonal
fitting (1/4-18 NPT internal thread) of the pressure controller to
the pipe nipple. To avoid leaks and damage to the case, use a
parallel jaw wrench on the hexagonal fitting close to the pipe
nipple. Do not tighten the pressure controller by hand by
holding the case.
Make all pipe connections in accordance with approved
standards. Use only a small amount of pipe compound to seal
the connection joints. Excess pipe compound may clog the
orifice in the pipe fitting and prevent the controller from
operating properly.
L404F,T,V PRESSURETROL® CONTROLLERS
WARNING
MAIN
OIL
LINE
TO OIL
BURNER
ATOMIZER
ATOMIZING MEDIUM
(AIR OR STEAM)
MANUAL
SHUTOFF
VALV E
LOW OIL
PRESSURE
CONTROLLER
HIGH OIL
PRESSURE
CONTROLLER
RECIRCULATING
VALVE AND SAFETY
SHUTOFF VALVE
OIL
PUMP WITH
PRESSURE RELIEF
LOW OIL
TEMPERATURE
STRAINER
MANUAL
SHUTOFF
VALV E
M17861
OIL PRESSURE
CONTROLLER
(AT RIGHT
ANGLES TO THE
MAIN PIPE LINE)
PIPE
WRENCH
HEXAGONAL
FITTING
MAIN PIPE LINE
M17860
MAIN TEE
(TURN TO LEVEL
THE CONTROLLER)
PIPE NIPPLE
4-1/2
TO
5-1/2
(114 TO
140)
PREHEATED OIL SUPPLY LINE
SIPHON LOOP
TEE
OIL PRESSURE
CONTROLLER
M23886
1
1
1/4 INCH PIPE WITH 1/4-18 NPT EXTERNAL THREADS ON
BOTH ENDS AND 2-1/4 IN. (57 MM) DIAMETER LOOP.
A
Fig. 3. Typical locations of pressure controllers in an oil burner system.
WIRING
Electrical Shock Hazard.
Can cause severe injury, death or property damage.
Disconnect the power supply before beginning wiring.
More than one power supply disconnect may be
required.
Fig. 4. Mounting an oil pressure controller
directly on the main pipe.
Using with Preheated Oil
When used with preheated oil, a siphon loop must always be
connected between the controller and the main pipe (see Fig.
5) to provide thermal buffering.
All wiring must comply with applicable codes and ordinances.
All models have terminals (on the MicroSwitch
®
snap-acting
switch) inside the cover and knockouts for conduit and cable.
Refer to manufacturer installation and wiring instructions, if
available, and to typical hookups shown in Fig. 6 to 10.
L404F PRESSURETROL
R
W
B
L1
(HOT)
POWER
SUPPLY
L2
1
24 VOLT
POWER
SUPPLY
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
AS SHOWN, SWITCH OPENS ON PRESSURE RISE. REVERSE
2
ACTING (MAKE ON PRESSURE RISE) UNITS ARE WIRED TO
R-W TERMINALS AND TERMINAL B IS OMITTED.
2
24 VOLT RELAY
M19637
Fig. 5. Mounting of a siphon loop, with approximate
dimensions in in. (mm).
Fig. 6. L404F in low voltage relay circuit.
5 71-2429—06
L404F,T,V PRESSURETROL® CONTROLLERS
LINE VOLTAGE
THERMOSTAT
L1
L2
(HOT)
POWER
SUPPLY
1
2
1
PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
AS SHOWN, SWITCH OPENS ON PRESSURE RISE. REVERSE
ACTING (MAKE ON PRESSURE RISE) UNITS ARE WIRED TO
R-W TERMINALS AND TERMINAL B IS OMITTED.
L404F PRESSURETROL
2
R
W
B
MOTOR
M19638A
Fig. 7. L404F in a typical 2-wire control circuit.
R
W
B
L404T
BREAKS ON PRESSURE
RISE TO SET POINT
L404V
MAKES ON PRESSURE
RISE TO SET POINT
R
W
B
(OMITTED)
M1801B
Fig. 8. L404T,V terminal blocks and internal schematics.
FLAME
SAFEGUARD
CONTROL
L2
OIL PRESSURE
CONTROLLER
MAIN OIL VALVE
SOLENOID
M9789
OTHER
OIL PRESSURE
CONTROLLER
L1
(HOT)
L2
CONTROLLERS,
LIMITS, AND
INTERLOCKS
L2
FLAME
SAFEGUARD
CONTROL
M9790
Fig. 10. Hookup of an oil pressure controller used on a
single burner or multiburner system with an external oil
pump.
SETTINGS AND ADJUSTMENTS
When the pressure at the control rises above the L404
setpoint, a circuit opens between the R-B terminals. During a
pressure fall, R-B will close at the setpoint pressure minus the
switch differential.
For example, if a controller is set to differential B (see Fig.11)
with a controller setpoint of A, R-B will open when the pressure
rises to A. Then during a pressure fall, the R-B terminals will
close when the pressure drops to C (A minus differential B).
For make on rise applications, the switch is wired to R-W
terminals. The R-W circuit will close on pressure rise to the
setpoint. R-W will open again on a pressure drop past the
switch differential.
B R-W
SET POINT
B-R BREAKS
(R-W MAKES)
SWITCH ACTION ON
PRESSURE RISE
B-R
INDICATES CLOSED SWITCH CONTACTS.
W
DIFFERENTIAL
(ADJUSTABLE)
Fig. 11. Operation of switch on pressure rise and fall.
CONTROL
B R-W
B-R
SWITCH ACTION ON
PRESSURE FALL
B-R MAKES
(R-W BREAKS)
W
M19639B
Fig. 9. Hookup of an oil pressure controller used on a
single burner system with an integral oil pump.
71-2429—06 6
Setpoint Adjustment
Turn the pressure adjusting screw on the top of the controller
(Fig. 12) to adjust the setpoint. Turn the differential adjusting
screw to the desired pressure difference between switch
opening and switch closing.
NOTE: When the main scale setting is at the lower end of the
operating range, the differential range will be less
than the differential setting by approximately 20
percent.
DIFFERENTIAL
A
DJUSTING SCREW
SCALEPLATES
PRESSURE ADJUSTING SCREW
GROUND SCREW
L404F,T,V PRESSURETROL® CONTROLLERS
However, if recalibration is necessary, remove the cover and
loosen the setscrews which hold the scaleplate. Adjust the
plate up or down, as required, to bring the device into
calibration. Tighten the setscrews securely and replace the
cover.
MAIN SCALE
PRESSURE
INDICATOR
DIFFERENTIAL
SETTING
INDICATOR
DIAPHRAGM
ASSEMBLY
OPERATING
LEVER
Fig. 12. view of L404 PressureTrol® Controller.
Scaleplate Adjustment
The L404F,T,V has been carefully calibrated during
manufacture and should not require recalibration.
M19640A
CHECKOUT
After the controller has been installed, wired and adjusted, it
should be tested with the system in operation. First, allow the
system to stabilize. Then, observe the operation of the
controller while raising and lowering its setpoint. Pressure
should increase when the setpoint is raised and decrease
when the setpoint is lowered.
Also, check the make and break points of the controller. If they
do not agree with a separate, accurately calibrated pressure
gauge, a slight adjustment of the scaleplate(s) may be
necessary.
Use accurate pressure testing equipment when checking out
the controller. Do not rely on inexpensive gauges. The
controllers are carefully calibrated at the factory.
7 71-2429—06
L404F,T,V PRESSURETROL® CONTROLLERS
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
Honeywell Limited-Honeywell Limitée
35 Dynamic Drive
Toronto, Ontario M1V 4Z9
customer.honeywell.com
® U.S. Registered Trademark
© 2010 Honeywell International Inc.
71-2429—06 M.S. Rev. 09-10
Printed in U.S.A.
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