Honeywell L404A, L404D, L404C, L404B, L404F Series Manual

L404A-D,F; L604A,L,M

Pressur etr ol® Contr ollers

L404 and L604 Pressuretrol® Controllers are
line voltage pressure controllers that provide oper­ating control, automatic limit protection, or manual
reset limit protection for pressure systems of up to
300 psi (21.1 kg/cm2 or 2068 kpa).

■ Can be used with steam, air, non-combustible gases,

or fluids non-corrosive to the pressure sensing ele­ment.

■ Stainless steel diaphragm (except 300 psi [21.1 kg/

2

(2068 kPa)] models) also allows use with am-

cm
monia, oxygen, distilled water, and similar media.

■ L404B is recommended for supervision of atomiz-

ing medium pressure in oil burner systems.

■ Models are available with spst, spdt, or dpst switch-

ing and in variety of operating ranges.

■ Dustproof, trouble-free mercury switches (all mod-

els except L404F, which has snap-acting switch).

■ Automatic reset models have adjustable, subtractive

differential (except L604M).

■ Trip-free mechanism on manual reset models as-

sures that limit function of controller cannot be
defeated by jamming reset lever.

■ Screw adjustments made on top of case.

■ Scaleplates marked in English (psi) and Metric

■ L404F models available with European enclosure,

■ Clear plastic cover on case to observe pressure set-

■ Leveling indicator visible through cover.

■ Hexagonal fitting with 1/4-18 NPT internal threads

■ Surface mount is available using screws through

CONTENTS

Specifications ................................................ 2

Ordering Information.................................... 2

Installation .................................................... 5

Setting and Checkout..................................... 8

Service Information ..................................... 10

2

(kg/cm

British Standard Pipe Threads, ground screw, and
scaleplates marked in kg/cm

tings and switch action.

for direct mounting to 14026 Steam Trap (siphon
loop).

holes (knockouts) in case backing.

) units.

2

and either psi or kPa.

L. Z. • Rev. 3-95 • ©Honeywell Inc. 1995

60-2150-10

L404A-D,F; L604A,L,M
SPECIFICATIONS • ORDERING INFORMATION

Specifications

TRADELINE® MODELS

TRADELINE® models are selected and packaged to
provide ease of stocking, ease of handling, and maximum
replacement value. Specifications of TRADELINE

®

con­trols are the same as those of standard models except as
noted below.

®

TRADELINE
L604A Pressuretrol® Controllers—Available in 2 to 15, 5 to

50, 10 to 150, and 20 to 300 psi (.14 to 1.1 kg/cm
103 kPa], .4 to 3.5 kg/cm

MODELS AVAILABLE:

2

[34 to 345 kPa], .7 to 10.6 kg/

2

[14 to

cm2 [69 to 1034 kPa], and 1.4 to 21.0 kg/cm2 [138 to
2068 kPa]) .

ADDITIONAL FEATURES: TRADELINE® pack with

cross-reference label.

STANDARD MODELS

MODELS: L404A-D,F and L604A,L,M Pressuretrol® Con-

trollers. See Table 1. A 14026 Steam Trap (siphon loop)

is available, except where noted in Table 1. The steam
trap is necessary for boiler installations.

SWITCH(ES): Mercury switch(es) in all models except the

L404F, which has a Micro Switch snap-acting switch.

PRESSURE SENSING ELEMENT: Stainless steel dia-

phragm (brass bellows in 300 psi [21.1 kg/cm

(2068 kPa)] models).
MAXIMUM AMBIENT TEMPERATURE: 150!F (66!C).
MINIMUM AMBIENT TEMPERATURE: Minus 35!F

(minus 37!C); also refer to the note in the Location and

Mounting section.
ADJUSTMENT MEANS: Screws on top of controller case.

Scales are marked in psi and kPa.
ELECTRICAL CONNECTIONS: Internal screw terminals;

hole in side of case for 1/2 in. conduit.
MOUNTING MEANS: Hexagonal fitting on diaphragm has

1/4-18 NPT internal threads for mounting on a pipe or

steam trap (siphon loop). Also can be surface-mounted

using screws through two holes (knockouts) in back of

case.

2

,

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the Tradeline
Catalog or price sheets for complete ordering number, or specify—

1. Order number (TRADELINE® model, if desired).

2. Operating range (see Table 1).

3. Model without steam trap, if desired and available (see Table 1, Note b).

4. Optional specifications, if desired (see Table 1).

5. Replacement parts, if desired.

6. Accessories, if desired.

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 Home and Building Control Sales Office (please check the white pages of your phone directory).

2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386

In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, 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.

60-2150—10 2

Ordering Information

L404A-D,F; L604A,L,M

SPECIFICATIONS

TABLE 1—MODELS AVAILABLE.

Switching
Action on

Pressure Rise

Model

L404A spst, breaks

L404B

L404C spst, breaks

L404D spst, makes

L404F spdt snap-acting

L604A 2 isolated spst

L604L spdt circuit

L604M spdt circuit

a

Scaleplates are marked in both psi and kg/cm

b

Model available with special fixed low differential. Switch rated for 0.5A at 120 Vac.

c

L404A,B and L604A models are available with 1 to 6 psi midscale subtractive differential in 2 to 15 psi models.

d

Brass bellows replaces stainless steel diaphragm. Not suitable for use with ammonia, oxygen, or other corrosive materials.

e

Model available with minimum operating pressure of 1.25 psi (0.09 kg/cm2 or 8.62 kPa) and minimum subtractive differential of 0.5 psi
(0.035 kg/cm

f

Model available with special fixed low differential. Switch rated for 0.5A at 120 Vac.

g

L404C,D and L604L models are designated as Manual Reset 2 controllers; the trip-free reset mechanism does not permit the controller to

to Setpoint

circuit

i

spst, makes

circuit

circuit

circuit

switch,

R-W, breaks R-B

circuits, or 1

j

spdt,

makes R1-

W, breaks R2-B

makes R-W,

breaks R-B

makes R-W,

breaks R-B

2

or 3.45 kPa).

h

makes

2 to 15

10 to 150
20 to 300

2 to 15d,

10 to 150

20 to 300

10 to 150

20 to 300

10 to 150

10 to 150

20 to 300

10 to 150

20 to 300

10 to 150 .66 to 10.1 69 to 1034 fixed: 3.5 psi (24.1 kPa) 225 15.8 1550

Operating Ranges

psi kg/cm

b,c

.14 to 1.0

b
d

c,e,f

e,b

d

d

i

d

c

d

.35 to 3.5

.66 to 10.6

1.4 to 21.0
.14 to 1.1

.35 to 3.5

.66 to 10.6

1.4 to 21.0
.14 to 1.0

.35 to 3.5

.66 to 10.6

1.4 to 21.0
.14 to 1.0

.66 to 10

.14 to 1.0
.35 to 3.5

.66 to 10

1.4 to21.0
.14 to 1.0

.35 to 3.5

.66 to 10

1.4 to21.0

2

5 to 50

5 to 50

2 to 15
5 to 50

2 to 15

2 to 15

5 to 50

2 to 15

5 to 50

2 to 15 .14 to 1.0 14 to 103 manual resetg

2

a

kPa psi kg/cm

14 to 103
34 to 345

69 to 1034

138 to 2068

14 to 103

24 to 345

69 to 1034

138 to 2068

14 to 103
34 to 345

69 to 1034

138 to 2068

14 to 103

69 to 1068

14 to 103
34 to 345

69 to 1034

138 to 2068

14 to 103
34 to 345

69 to 1034

138 to 2068

Midscale Subtractive Differential

2 to 6
4 to 12
8 to 16

15 to 40

2 to 6
4 to 12
8 to 16

15 to 40

2 to 6
6 to 14

10 to 22
20 to 50

2 to 6
4 to 12
8 to 16

15 to 40

(Adjustable)

2

.14 to .41

.28 to.82

.56 to 1.10

1.04 to 2.76
.14 to .41

.28 to .82

.56 to 1.10

1.04 to 2.76

manual reset

(fixed, subtractive differential)

manual reset

(fixed, subtractive differential)

.14 to .41
.41 to .97

.69 to 15.2

1.4 to 3.5
.14 to .41

.28 to .82

.56 to 1.10

1.04 to 2.76

(fixed, subtractive differential)

103 to 276

103 to 276

g

138 to 345

103 to 276

function as an automatic-reset device when the manual reset lever is held in the reset position. The subtractive differential is fixed at the
minimum value of the adjustable differential of the L404A for each corresponding operating range.

h

L404F only; all other models have mercury switches.

i

Model available with sealed bell crank adjustment.

j

Spst switches operate in unison; spdt action when jumper is installed between R1 and R2.

k

Also recommended for supervision of atomizing medium pressure (air or steam) in an oil burner system.

a

Maximum Surge

Pressure

kPa psi kg/cm2kPa

14 to 4
127 to 83
55 to 110

14 to 41
27 to 83

55 to 110

14 to 41
41 to 97

60 to 152

14 to 41
27 to 83

55 to 110

50

3.5

85
225
500

225
500

225
500

225

225
500

225
500

6.0

15.8

35.2

50

3.5

85

6.0

15.8

35.2

50

3.5

85

6.0

15.8

35.2

50

3 5

15.8

50

3.5

85

6.0

15.8

35.2

25

1.8

85

6.0

15.8

35.2

25 1.8 172

1550
3445

1550
3445

1550
3445

1550

1550
3445

1550
3445

345
586

345
586

345
586

345

345
586

172
586

SWITCH CONTACT RATING (in amperes at 50/60 Hz):

Model Load 120 Vac 240 Vac 120 Vdc 240 Vdc

L404 A Full Load

Locked Rotor
Noninductive

L604A,L

b

Full Load
Locked Rotor
Noninductive

L604M Full Load 1. 0 0. 5 1. 0 0. 5

a

L404F (snap-acting) does not have non-inductive or dc ratings.

b

L604A and L have also been tested (and listed by Underwriters Laboratories Inc.) and breaking (not making) a load with a total
rating of 9.8 A full load, plus 360 VA ignition, plus 250 VA pilot duty at 120 Vac.

8.0

a

48.0

10.0

8.0

48.0

10.0

5.1

30.6

5.0

5.1

30.6

5.0

2.4

24.0

5.0

2.0

20.0

8.0

1.2

12.0

2.0

1.0

10.0

4.0

3 60-2150—10

L404A-D,F; L604A,L,M
SPECIFICATIONS

DIMENSIONS: See Fig. 1. See Fig. 2 for mounting steam

trap (siphon loop).
WEIGHT: 2 IBC. (0.91 kg).
FINISH: Gray.
APPROVALS:

Underwriters Laboratories Inc. listed (L404A,B,C,D,F;

L604A,L,M only): file no. MP466, vol.10; guide
no. MBPR.

Canadian Standards Association certified (L404A,B,C,D,F;

L604A,L only): file no. LR1620; guide no.400-E-0.

REPLACEMENT PARTS:

129178 Thermoplastic Cover.
14026 Steam Trap (siphon loop)—1/4 in. black iron pipe.

Necessary for boiler installations.

ACCESSORIES:

33312B Knurled Adjustment Knob—with setscrew; fits

on main scale pressure adjusting screw.

4074BWJ Limit Stop Assembly—to limit set point ranges;

includes 129564 Range Stop, 107194 Range Stop
Screw, and 23466 Wrench.

TABLE 2—CONVERSION TABLE (psi to kPa).

Scale-Plate

(psi)

Operating Range

Equivalent

2)

(kg/cm

(kPa)

Scale-Plate

(psi)

Subtractive Differential

Equivalent

2)

(kg/cm

0 to 15 0 to 10 0 to 103 — — —
2 to 15 .14 to1.0 14 to 103 1 to 6

2 to 6

5 to 50 .3 to 3.5 34 to 345 4 to 12

5 to 14

07 to 4

.14 to .4

.3 to .8

.4 to 1.0

5 to 150 .3 to 10.3 34 to 1034 — — —

10 to 150 .7 to 10.3 69 to 1034 8 to 16

10 to 22

20 to 300 1.4 to 20.7 138 to 2068 15 to 40

20 to 50

.6 to 1.1
.7 to 1.5

1.0 to 2.8

1.4 to 3.5

(kPa)

7 to 41

14 to 41
28 to 83

41 to 97

55 to 110
69 to 152

103 to 276
138 to 345

Fig. 1—Mounting dimensions of the L404A,B,C,D,F and L604A,L,M Pressuretrol® Controllers, in in. (mm).

L404A-D,F; L604A,L,M

4-1/2 (114.3) (COVER)

4-11/32 (110.3) (CASE)

1-15/16 (49.2)

3-3/16 (81.0)

1-5/32
(29.4)

2-1/8 (54.0)

RESET LEVER (ON MANUAL RESET MODELS ONLY.)

1

THIS DIMENSION IS 4-27/32 IN. (123.0 MM) ON L604 MODELS WITH A 2 TO 15 PSI (.14 TO 1.0 kg/cm

2

AND 5-3/4 IN. (146.A MM) ON L604 MODELS WITH A 20 TO 300 PSI (1.4 TO 20.7 kg/cm
ONLY ON L604 MODELS WITH A 2 TO 15 PSI (.14 TO 1.0 kg/cm

3

1-61/64 (49.6)

1

1/4-18 NPT

3-7/8

(98.4)

1-13/16

(46.0)

3/16 (4.8) X 21/64 (8.3)
KNOCKOUT (2)

2

2

(14 TO 103 kPa)) OPERATING RANGE.

(138 TO 2068 kPa) OPERATING RANGE.

2-3/4 (69.9)

1-1/16
(27.0)

13/16
(20.6)

1

7/8

(22.2) DIA.

1-1/16

1-3/16 (30.2)

2

(14 TO 103 kPa)) OPERATING RANGE,

(27.0)

1-1/2 (38.1)

1/2 (12.7)

3

13/16
(20.6)

3-23/32

(94.5)

4-31/32
(126.2)

2

M8933

60-2150—10 4