Submittal Sheet
Honeywell
L404 AND
L604
PRESSURETROL
CONTROLLERS
L404
AND
L604
PRESSURETROL CONTROLLERS ARE LINE
VOLTAGE PRESSURE CONTROLLERS THAT PROVIDE OPER-
ATING CONTROL,
AUTOMATIC
LIMIT
PROTECTION, OR MAN-
UAL RESET LIMIT PROTECTION FOR PRESSURE SYSTEMS
OF UP TO 300 psi
[21.1
kg/cm* or 2066
kPa].
Cl L404A
0
L404D
0
L604A
0
L404B
cl
L404F
’
0
L604L
0
L404C
Cl
L604M
l
These controllers may be used with steam, air, noncombust-
ible gases, or fluids noncorrosive to the pressure sensing
element.
l
Stainless steel diaphragm (except the 300 psi
[21.1
kg/cm*
(2066 kPa)] models) also allows use with ammonia, oxygen,
distilled water, and similar media.
l Stainless steel diaphragm (except the
L404L
and 300 psi
[21.1
kgIcmz(2066
kPa)]) ammonia, oxygen, distilled water, and
similar media.
l
L404B
is recommended for supervision of atomizing medium
pressure in oil burner systems.
l
Models are available with spst, spdt, or dpst switching and in
a variety of operating ranges.
l
Dustproof, trouble-free mercury switches (all models except
the
L404F, which has a snap-acting switch).
l Automatic reset models have an adjustable, subtractive
differential (except the L604M).
l
Trip-free mechanism on manual reset models ensures that the
limit function of the controller cannot be defeated by jamming
the reset lever.
l
Adjustments are made by screws on top of case.
l
Scaleplates are marked in English (psi) and Metric
[kg/cm*]
units.
l
L404F
models are available with European enclosure, British
Standard Pipe Threads, ground screw, and scalepfates marked
on kg/cm* and either psi or
kPa.
l Case has clear plastic cover so that prssure settings and
switch action can be observed.
l
Leveling indicator visible through cover.
l
Hexagonal fitting with
l/4-16
NPT internal threads for direct
mounting to a 14026 Steam Trap (siphon loop).
l Can also be surface mounted by screws through holes
(knockouts) in back of case.
I
SPECIF
ICATIONS
I
STANDARD MODELS
MODELS: L404A-D,F and
L694A,L,M
Pressuretrol Controllers. See
Table I on the next page. A 14026 Steam Trap (siphon loop) is
available, except where noted in Table
I.
The steam trap is
necessary for boiler installations.
SWITCH(ES):
Mercury
switchies)
in all models except the
L404F,
which has a Micro Switch snap-acting switch.
PRESSURE SENSING ELEMENT: Stainless steel diaphragm (brass
bellows in 300 psi
[21.1
kg/cm*, (2068
kPa)]
models).
MAXIMUM AMBIENT TEMPERATURE: 150 F
[66
c].
-
MlNlMUMAMBlENTTEMPERATUREMinus35F[minus3?’C];also~
refer to note under Location and Mounting in the INSTALLATION
section.
ADJUSTMENT MEANS: Screws on top of controller
c%seI
Scales
are marked in psi and
kPa.
ELECTRICAL CONNECTIONS: Internal screw
terminal%
h&
inside-
of case for
l/2
in. conduit.
MOUNTING MEANS: Hexagonal fitting on diaphragm has
l/4-18
NPT internal threads for mounting on a pipe or steam trap
(siphon loop). Also can be surface mounted
by
screws through 2
holes (knockouts) in back of case.
DIMENSIONS: See Fig. 1; also Fig. 2 for mounting steam trap (siphon
loop).
WEIGHT: 2 lb.
[0.91
kg].
FINISH: Gray.
APPROVALS:
UNDERWRITERS LABORATORIES INC. LISTED
(L404A,B,C,D,F;
L604A,M
only): File No. MP466, Vol. 10; Guide No. MBPR.
CANADIAN
STANDARt
>S
ASSOCIATION CERTIFIED
(L404A,B,C,D,F;
L804A,L
only): File No. LR1620; Guide No.
400-E-0.
MAIN SCALE
ADJUSTING
DIFFERENTIAL
ADJUSTING
SCALEPLATES-wusrd
DIFFERENTIAL
SETTING
INDICATOR\
MAIN SCALE
SETTING
DIAPHRAGM
ASSEMBLY
LEVELING
INDICATOR
POINTER
A
ADJUSTABLE DIFFERENTIAL ON THE
L404A.B.F;
L404L
WITH
A 5 TO 150 PSI [.34TO 10.3
kg/cm3
(34T0 134
kPa))
OPERATING
RANGE; AND
L604A
MODELS ONLY.
A
2
TRIP-FREE MANUAL RESET LEVER ON THE
L404C.O
AND
L604L
MODELS ONLY.
E2076
FIG. l-SETTING A PRESSURETROL CONTROLLER.
D.A.
Form Number
66-0061
12-86e
cHoneywell Inc. 1986