Low Water Cut-offs
Combination Low Water Cut-offs/Pump Controllers
Water Feeders
Valves
Liquid Level Controls
Liquid Flow Switches
Air Flow Switches
System Selection Chart
Product Selection Guide
Basic System Operation
McDonnell & Miller Guide to Mercury Free Boiler Controls

BOILER CONTROLS
	How to Select
Low Water Cut-offs
	For Hot Water Boilers
	• Electronic
	750
	PS-850
	Self-cleaning probes help prevent lime build-up
	RB-24
	RB-120
	RB-122
	• Float Type
	63
	64
	764
	For Steam Boilers
	• Electronic
	150E/157E
	750
	750-HW-MT-120 for High Water Conditions
	750B
	PS-800
	• Float Type
	61
	63
	64
	67
	69
	150
	150S
	157
	157S
	764
	767
	MD Model Setpoints
	Blow Down Piping
Combination LWCO/Pump Controllers for Steam Boilers
	42
	42S
	93
	94
	150
	150S
	157
	157S
	193
	194
Water Feeders
	Electric
	Series WF Uni-MatchÒ
	101-A
	Mechanical
	• Combination Mechanical/Low Water Cut-off
	47/47-2
	51/51-2
	51-S/51-S-2
	53/53-2
	247/247-2
	• Make-up
	21
	25-A
	221
	551-S
	847
	851/851-S
Valves
	Blow Down
	14-B
	Test-N-CheckÒ
	TC-4
	Pressure Relief
	250
	260
LIQUID LEVEL CONTROLS
	Conductance Actuated (Probe Type)
	• General Purpose Sensor and Controls
	RS Sensors
	750B-C3
	Replacement Electrode Assemblies
	AS Probes
	LPC-2000
	PCH
	PCL
	Remote Sensor Location/Probe Location
	How to Select Liquid Level Controls
	LPC-2000 Operation & Selection
	Float Actuated Pneumatic
	PFC
	Float Actuated Switches
	65
	165
	Float Actuated Valves
	18
	27-W
	3155
FLOW CONTROLS
Liquid Flow Switches
	Liquid Flow Switch Installation
	How to Select Liquid Flow Switches
	Liquid Flow Switch K Factors
	General Purpose
	FS4-3
	FS4-3T
	FS5
	FS8-W
	High Sensitivity
	FS1
	FS1-W
	FS6/FS6-W
	Industrial
	FS7-4
	FS7-4A
	FS7-4E
	FS7-4W
Air Flow Switches - How to Select
	AF1
	AFE-1
	AF2
	AF3
	Flow Switch Time Delay Relays
	T5R
	T20
Basic Wiring
	Blow Down Piping
Glossary of Terms
Approval Agencies
CE Conformance
Maintenance
Warranty & Return Policy