Honeywell Pressuretrol L404B 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 L404B Specifications

General

Model	L404B
Manufacturer	Honeywell
Differential	Adjustable
Switch Operation	SPDT
Electrical Connections	Screw terminals
Mounting	Vertical
Approvals	UL, CSA
Type	Pressuretrol
Electrical Rating	120 Vac
Electrical Rating (Amps)	8 A @ 120 Vac
Temperature Range	32°F to 150°F (0°C to 65°C)
Mounting Type	Pipe
Mounting Options	Pipe

Summary

Specifications

TRADELINE® Models

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

Standard Models

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

Ordering Information

Installation

Location and Mounting

Guidance on proper placement, leveling, and mounting of controllers for optimal operation.

Mounting on a Boiler

Instructions for mounting the controller on a boiler fitting or steam trap.

Mounting at a Remote Location

Procedures for mounting the controller remotely to avoid vibration issues.

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

Details on using the L404B for supervising atomizing medium pressure in oil burners.

Wiring

Instructions and guidelines for wiring the controller, including safety precautions.

Setting and Checkout

Setting the Controller

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

Checkout Procedure

Steps to test and verify controller operation after installation and setting.

Boiler Installation Checkout

Specific testing procedures for controllers installed on boiler systems.

Troubleshooting Improper Operation

Steps to diagnose and resolve issues if the controller does not operate properly.

Service Information

Calibration

Information on calibration, emphasizing the importance of proper controller leveling.

Maintenance

Guidelines for routine maintenance, inspection, and keeping the controller covered.