Brochure

Parker Hannifin Corporation
Climate & Industrial Controls Group
Cleveland, OH
Catalog CIC-2003-1/US
Industrial Refrigeration Products: Liquid Level Control
428
Refrigerant Float Switch
●
Hermetically Sealed, Fused Switch Assembly
●
Transparent Switch Housing for Visual Observation
●
Magnetically Actuated, Mechanically Operated
●
Single Stage, Single Pole, Double Throw Switch
●
Float Controlled
●
Rugged Construction
●
Switch Assembly Fully Rotatable to Suit Installation
●
Large Available Differential Minimizes Short Cycling or
Actuation of Switch by Liquid Surges
●
Types LL, LLC, LLS, LLSC, LLA, LLAC are
U.L. Listed and CSA Certified
●
DIN Connector Standard except on Explosion Proof
Versions
Description
Refrigerant float switches are suitable for use with Ammo-
nia, R22, R134a, R404a, R507 and other common refriger-
ants. This float controlled, magnetically actuated, mechani-
cally operated switch assembly can maintain close control
of liquid level. The rugged construction makes it relatively
insensitive to disturbances of the refrigeration system or
vibration of the attached pipe lines.
The electrical switch, which is fused, and the operating
mechanism are encapsulated within a transparent housing,
which HERMETICALLY SEALS the moving parts and switch
from ambient conditions and yet allows observation of the
switching motion for determination of the liquid level.
Types LLC, LLSC, LLAC are U.L. listed for outdoor service.
Types LLX, LLXS and LLAX are not fused.
Applications
To control liquid level in:
●
liquid overfeed accumulators
●
flooded surge drums
●
flooded shell & tube chillers
●
high and low pressure receivers
●
intercoolers
●
transfer vessels
●
low or high level monitor
Materials
Standard Chamber ................................................... Steel
Float Ball .....................................................Stainless Steel
Specifications
Design Pressure (MRP)........................ 27.6 bar (400 PSI)
Fluid Temperature Range ......-45° to 65°C (-50° to 150° F)
Ambient Temperature ............-45° to 50°C (-50° to 120° F)
Switch ........................... SPDT, Snap-acting, non-mercury
Rating................. 120/240VAC, 10 Amp, 240 VA Pilot Duty
Fluid Specific Gravity Range ........................... 0.57 to 1.70
Differential............................ Adjustable 13-50 mm (½"-2")
Factory set at 50mm (2")
Chamber Connections .................... ¾" FPTor 1" Butt Weld
Replaceable Fuse Style Bag ................... 7 Amp, 240 VAC
Refer to Bulletin 61-10.
LL LLS
Technical Information