Product Data
Table Of Contents
L404A,B
Pressuretrol® Controllers
PRODUCT DATA
APPLICATION
L404 Pressuretrol® Controllers are line voltage pressure
controllers that provide operating 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).
FEATURES
• Can be used with steam, air, non-combustible gases,
or fluids non-corrosive to the pressure sensing
element.
• Stainless steel diaphragm (except 300 psi [21.1 kg/cm
2
;
2068 kPa] models) also allows use with ammonia,
oxygen, distilled water and similar media.
• L404B is recommended for supervision of atomizing
medium pressure in oil burner systems.
• Dustproof, trouble-free mercury switches.
• Automatic reset models have adjustable, subtractive
differential (except L404A1651).
• Screw adjustments made on top of case.
• Scaleplates marked in Metric (kg/cm
2
) and English
(psi) units.
• Clear plastic cover on case to observe pressure
settings and switch action.
Contents
Application ........................................................................ 1
Features ........................................................................... 1
Specifications ................................................................... 2
Ordering Information ........................................................ 2
Installation ........................................................................ 4
Setting and Checkout ....................................................... 6
Service Information .......................................................... 8
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95C-10187B-1