3 60-2150—10
L404A-D,F; L604A,L,M
SPECIFICATIONS
TABLE 1—MODELS AVAILABLE.
a
Scaleplates are marked in both psi and kg/cm
2
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/cm
2
or 8.62 kPa) and minimum subtractive differential of 0.5 psi
(0.035 kg/cm
2
or 3.45 kPa).
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
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.
SWITCH CONTACT RATING (in amperes at 50/60 Hz):
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.
Model Load 120 Vac 240 Vac 120 Vdc 240 Vdc
L404A Full Load
Locked Rotor
Noninductive
a
8.0
48.0
10.0
5.1
30.6
5.0
2.4
24.0
5.0
1.2
12.0
2.0
L604A,L
b
Full Load
Locked Rotor
Noninductive
8.0
48.0
10.0
5.1
30.6
5.0
2.0
20.0
8.0
1.0
10.0
4.0
L604M Full Load 1.0 0.5 1.0 0.5
Switching
Action on
Pressure Rise
Operating Ranges
a
Midscale Subtractive Differential
a
(Adjustable)
Maximum Surge
Pressure
Model
to Setpoint
psi kg/cm
2
kPa psi kg/cm
2
kPa psi kg/cm
2
kPa
L404A spst, breaks
circuit
2 to 15
b,c
5 to 50
10 to 150
b
20 to 300
d
.14 to 1.0
.35 to 3.5
.66 to 10.6
1.4 to 21.0
14 to 103
34 to 345
69 to 1034
138 to 2068
2 to 6
4 to 12
8 to 16
15 to 40
.14 to .41
.28 to.82
.56 to 1.10
1.04 to 2.76
14 to 4
127 to 83
55 to 110
103 to 276
50
85
225
500
3.5
6.0
15.8
35.2
345
586
1550
3445
L404B
i
spst, makes
circuit
2 to 15d,
c,e,f
5 to 50
10 to 150
e,b
20 to 300
d
.14 to 1.1
.35 to 3.5
.66 to 10.6
1.4 to 21.0
14 to 103
24 to 345
69 to 1034
138 to 2068
2 to 6
4 to 12
8 to 16
15 to 40
.14 to .41
.28 to .82
.56 to 1.10
1.04 to 2.76
14 to 41
27 to 83
55 to 110
103 to 276
50
85
225
500
3.5
6.0
15.8
35.2
345
586
1550
3445
L404C spst, breaks
circuit
2 to 15
5 to 50
10 to 150
20 to 300
d
.14 to 1.0
.35 to 3.5
.66 to 10.6
1.4 to 21.0
14 to 103
34 to 345
69 to 1034
138 to 2068
manual reset
(fixed, subtractive differential)
50
85
225
500
3.5
6.0
15.8
35.2
345
586
1550
3445
L404D spst, makes
circuit
2 to 15
10 to 150
.14 to 1.0
.66 to 10
14 to 103
69 to 1068
manual reset
g
(fixed, subtractive differential)
50
225
3 5
15.8
345
1550
L404F spdt snap-acting
switch,
h
makes
R-W, breaks R-B
2 to 15
5 to 50
i
10 to 150
20 to 300
d
.14 to 1.0
.35 to 3.5
.66 to 10
1.4 to21.0
14 to 103
34 to 345
69 to 1034
138 to 2068
2 to 6
6 to 14
10 to 22
20 to 50
.14 to .41
.41 to .97
.69 to 15.2
1.4 to 3.5
14 to 41
41 to 97
60 to 152
138 to 345
50
85
225
500
3.5
6.0
15.8
35.2
345
586
1550
3445
L604A 2 isolated spst
circuits, or 1
spdt,
j
makes R1-
W, breaks R2-B
2 to 15
c
5 to 50
10 to 150
20 to 300
d
.14 to 1.0
.35 to 3.5
.66 to 10
1.4 to21.0
14 to 103
34 to 345
69 to 1034
138 to 2068
2 to 6
4 to 12
8 to 16
15 to 40
.14 to .41
.28 to .82
.56 to 1.10
1.04 to 2.76
14 to 41
27 to 83
55 to 110
103 to 276
25
85
225
500
1.8
6.0
15.8
35.2
172
586
1550
3445
L604L spdt circuit
makes R-W,
breaks R-B
2 to 15 .14 to 1.0 14 to 103 manual reset
g
(fixed, subtractive differential)
25 1.8 172
L604M spdt circuit
makes R-W,
breaks R-B
10 to 150 .66 to 10.1 69 to 1034 fixed: 3.5 psi (24.1 kPa) 225 15.8 1550
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