Honeywell Pressuretrol L404C 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 L404C Specifications

General

Brand	Honeywell
Model	Pressuretrol L404C
Category	Controller
Language	English

Summary

Specifications

TRADELINE® Model Overview

Details on TRADELINE® models, their packaging for ease of stocking and handling.

Standard Model Features

Information on standard models, including switch types and pressure sensing elements.

Switch Contact Ratings

Electrical ratings for the controller's switches at various voltage and load conditions.

Physical and Approval Details

Dimensions, weight, finish, and product approvals (UL, CSA) for the controllers.

Replacement Parts and Accessories

Lists available replacement parts and optional accessories for controller customization.

Ordering Information

How to Place an Order

Guide on specifying order numbers, ranges, and options for purchasing.

Installation

Installation Safety and Precautions

Critical warnings and important notes to follow before and during installation.

Location and Mounting Best Practices

Guidance on choosing the right location and mounting methods for optimal performance.

Leveling for Accurate Operation

Instructions on how to level the controller, essential for mercury switch accuracy.

Mounting Configurations

Details on mounting alongside a gauge, on a boiler, or at a remote location.

L404B Atomizing Medium Supervision

Specific application of the L404B for supervising atomizing medium pressure in oil burners.

Wiring the Controller

Comprehensive steps and guidelines for proper wiring of the pressure controller.

Setting and Checkout

Setting Operating Points

How to adjust main scale set point and differential settings for desired operation.

Operational Checkout Procedure

Steps to verify controller function and switch operation after installation.

Boiler Installation Testing

Specific tests for controllers installed on boiler systems to ensure correct function.

Troubleshooting Controller Issues

Methods for diagnosing and resolving improper controller operation using an ohmmeter.

Service Information

Calibration and Leveling

Information on calibration, emphasizing the importance of proper leveling.

Routine Maintenance

Guidelines for inspecting and cleaning the controller for long-term reliability.