Honeywell Pressuretrol L604A 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 L604A Specifications

General

Brand	Honeywell
Model	Pressuretrol L604A
Category	Controller
Language	English

Summary

Specifications

TRADELINE® MODELS

Details TRADELINE® models, their packaging, and features.

STANDARD MODELS

Lists STANDARD MODELS (L404A-D,F and L604A,L,M) and their general specifications.

INSTALLATION

CAUTION

Warning about disconnecting power before installation to prevent damage or shock.

IMPORTANT

Key points for controller installation, including temperature limits and leveling.

LOCATION AND MOUNTING

Guidance on controller placement, temperature considerations, and boiler mounting.

Leveling

Instructions on how to level the controller for proper operation using the indicator.

Mounting Alongside a Pressure Gauge

Describes how to mount the controller next to a pressure gauge using a steam trap.

Mounting on a Boiler

Instructions for mounting the controller on a boiler if not alongside a gauge.

Mounting at a Remote Location

Guidance for mounting the controller remotely to avoid vibration issues.

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

Explains the use of the L404B for supervising atomizing medium pressure in oil burners.

WIRING

Instructions for wiring the controller, including power disconnection and wire selection.

SETTING AND CHECKOUT

SETTING

Explains how to adjust the main scale set point and differential setting.

Trip-Free Manual Reset Feature (L404C,D and L604L only)

Describes the trip-free manual reset mechanism for specific models.

CHECKOUT

Instructions for testing the controller's operation after installation and setting.

Boiler Installation

Steps for testing controller operation on a boiler installation.

If a Controller Seems to Operate Improperly

Procedure for checking controller operation using an ohmmeter if it seems faulty.

Service Information

CALIBRATION

Discusses controller calibration, primarily related to proper leveling.

MAINTENANCE

Guidelines for routine maintenance, including cover placement and inspections.