Honeywell Pressuretrol L404 Series - 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 L404 Series Specifications

General

Model	L404 Series
Electrical Connections	Screw terminals
Setpoint Adjustment	Adjustable
Differential Adjustment	Adjustable
Switch Type	SPDT
Connection Size	1/4" NPT
Approvals	UL, CSA

Summary

Specifications

TRADELINE MODELS

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

STANDARD MODELS

Details 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.

Supervision of Atomizing Medium Pressure (Air or Steam)-L404 B

Details the L404B's use in oil burner systems for atomizing medium pressure.

WIRING

Instructions and guidelines for connecting the controller's electrical wiring.

Setting and Checkout

SETTING

How to adjust the main scale set point and differential setting.

Trip-Free Manual Reset Feature

Explains the manual reset mechanism for specific models.

CHECKOUT

Procedures for testing controller operation after installation.

Service Information

CALIBRATION

Discusses controller calibration and the importance of proper leveling.

MAINTENANCE

Guidelines for routine maintenance and protecting the controller.