Honeywell PRESSURETROL L404F User Manual

L. Z. • Rev. 3-95 • ©Honeywell Inc. 1995
L404A-D,F; L604A,L,M
Pressuretrol
®
Controllers
CONTENTS
Specifications ................................................ 2
Ordering Information .................................... 2
Installation .................................................... 5
Setting and Checkout..................................... 8
Service Information ..................................... 10
L404 and L604 Pressuretrol
®
Controllers are
line voltage pressure controllers that provide oper-
ating control, automatic limit protection, or manual
reset limit protection for pressure systems of up to
300 psi (21.1 kg/cm
2
or 2068 kpa).
■ Screw adjustments made on top of case.
■ Scaleplates marked in English (psi) and Metric
(kg/cm
2
) units.
■ L404F models available with European enclosure,
British Standard Pipe Threads, ground screw, and
scaleplates marked in kg/cm
2
and either psi or kPa.
■ Clear plastic cover on case to observe pressure set-
tings and switch action.
■ Leveling indicator visible through cover.
■ Hexagonal fitting with 1/4-18 NPT internal threads
for direct mounting to 14026 Steam Trap (siphon
loop).
■ Surface mount is available using screws through
holes (knockouts) in case backing.
■ Can be used with steam, air, non-combustible gases,
or fluids non-corrosive to the pressure sensing ele-
ment.
■ Stainless steel diaphragm (except 300 psi [21.1 kg/
cm
2
(2068 kPa)] models) also allows use with am-
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.
60-2150-10

Honeywell PRESSURETROL L404F Specifications

General

Brand	Honeywell
Model	PRESSURETROL L404F
Category	Controller
Language	English

Summary

Specifications

TRADELINE® MODELS

Details on TRADELINE® models, their packaging, and stock features.

STANDARD MODELS

Information on standard L404A-D,F and L604A,L,M Pressuretrol® Controllers.

Ordering Information

INSTALLATION

LOCATION AND MOUNTING

Guidance on where and how to mount the controller for optimal performance.

Leveling

Instructions for accurately leveling the controller for proper operation.

Mounting Alongside a Pressure Gauge

How to mount the controller next to a pressure gauge.

Mounting on a Boiler

Instructions for mounting the controller directly on a boiler fitting.

Mounting at a Remote Location

How to mount the controller away from excessive vibration.

Supervision of Atomizing Medium Pressure (Air or Steam)-L404B

Specific application of L404B for oil burner systems.

WIRING

Instructions for connecting the controller's electrical wiring.

SETTING AND CHECKOUT

SETTING

Steps to adjust the main scale and differential set points.

CHECKOUT

Procedures to test the controller's operation after installation.

Boiler Installation

Specific testing procedure when the controller is used on a boiler.

If a Controller Seems to Operate Improperly

Troubleshooting steps for diagnosing controller malfunctions.

SERVICE INFORMATION

CALIBRATION

Information on controller calibration and leveling importance.

MAINTENANCE

Guidance on routine maintenance for the controller.