Honeywell Pressuretrol L404 Series, 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