Hansen HLLSl, HLL, HLLSCl, HLLCl, HLLSWl Specifications, Applications, Service Instructions & Parts

HLL Refrigerant Float Switch

Bulletin HLLe

SEPT 2013

Specifications, Applications,

Service Instructions & Parts

REFRIGERANT

FLOAT SWITCHES

for Ammonia, R22, R134a, CO2

and Other Approved Liquids

INTRODUCTION

These Hansen refrigerant liquid level float switches
(HLL Series) are used to electrically indicate or control

a liquid level by opening or closing a SPDT switch. Their
simple, reliable design provides long life performance
for almost any application.

APPLICATIONS

These refrigerant liquid level float switches are typically

installed on a vessel’s liquid level column. They can

control liquid level by controlling a liquid fill solenoid

valve. Often, they are used to provide high level cut-

out or alarm. In addition, they can be used to turn off

a recirculating liquid pump if a low level occurs. Other
applications include control of liquid level via a liquid

exit solenoid valve, level indication via a pilot light,

and transfer drum operation.

MATeRIAL SPeCIFICATIONS

Safe Working Pressure: 400 psig (27 bar),

600 psig (40 bar) for CO2

Operating Temperature: -50ºF to +150ºF

(-45°C to +65°C)

Connections: ¾" FPT / 1" Butt Weld combination

Specific Gravity: 0.57 to 1.70

Electrical Switch: 120V, 240V, 10 amp SPDT

Connection: ½" NPSM for conduit, optional

DIN plug (3 wire plus ground)

ADVANTAGeS

Innovative features make these float switches the
superior selection. To overcome the most common
reason for existing float switch failure, switch burnout,
a heavy duty 10 amp snap action Honeywell SPDT
Micro Switch® is used. This switch is sealed in a
clear housing to allow visual confirmation of switch
action but protection from tampering. In addition, the
switch is surrounded by an inert gas which provides
an environment which inhibits corrosion. For ease of

installation, switch assembly position rotates 360°. If

the switch assembly should ever need to be replaced,
simply loosen the retaining screw and lift the lfoat
switch assembly off the top of the tank assembly.
Optional switch housing heater prevents moisture
penetration in humid environments.

Tank assembly is rugged, steel bodied with unique
combination ¾" FPT / 1" Butt Weld connections. Inside,
a high pressure tested float ball moves up and down via
a large diameter stem, overcoming potential bending
or breakage. Its movement is accurately guided by the
attractor and an alignment guide. Therefore, the float

ball assembly is not subject to the common, adverse
effects of normal oil and sludge build-up on the tank

interior walls. A deflector plate across the inlet of

the tank assembly protects the float ball against
sudden surges and provides smoother operation. In
addition, lower and upper cushioning springs provide

improved protection for the float ball. A standard 2"
(50 mm) differential prevents most short cycling due to
momentary changes in liquid level; other differentials
down to 0.5" (13 mm) are available. Because the tank
assembly is welded, it eliminates gasket leak potential
as well as tampering.

key FeATUReS

KEY FEATURES

CLEAR HOUSING

HERMETICALLY
SEALED

MAGNET

LEVER ARM

HEAVY DUTY 10 AMP
SPDT SWITCH

OPTIONAL
METAL COVER

SWITCH ASSEMBLY
POSITION
ROTATES 360°

WELDED TANK AND
NECK ASSEMBLY
ELIMINATES
GASKET LEAK
POTENTIAL

GROOVE

ATTRACTOR

OPTIONAL HEATER

1/2" NPSM
CONDUIT CONNECTION
(OPTIONAL DIN PLUG)

SIDE VIEW

RETAINING SCREW

UPPER SPRING

3/4" FPT/1" BUTTWELD
CONNECTION

HIGH PRESSURE
TESTED

FLOAT BALL

HLLe
SEPT 2013

3/4" FPT/1" BUTTWELD
CONNECTION
HLLS, HLLSC ONLY

LOWER SPRING

3/4" FPT/1" BUTTWELD
CONNECTION

2