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For more
than 80 years, McDonnell & Miller has been the leader
in engineering and manufacturing a comprehensive line
of boiler controls, liquid level controls and
flow switches for steam and hot water boilers.
It is part of the ITT Industries Inc, which is a global
engineering and manufacturing company with leading positions
in the markets it serves, generating 2004 sales of $6.8
billion and employing around 42,000 people around the
world. |
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Product
Selection Guide
System
Selection Chart
Basic
System Operation
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Flow Switches
A wide range of flow switches for various types of applications
such as treatment systems, metering devices, air-conditioning etc.
is offered.
Series |
Description |
FS1 |
For general purpose applications
where high sensitivity is required and moderate or low flow
rates are encountered such as air conditioning, heating and
hydronic systems, water, fuel oil, some viscous liquids and
oils in process work |
FS6 |
For heavy duty applications
where high sensitivity is required, such as water treatment
systems, cooling systems for electronic circuits, compressors,
booster pumps, and bearings, and other applications that need
instant switching. |
FS4-3 |
Designed to serve the
widest variety of applications , it is used for starting
or stopping electrically operated equipment such as signal
lights, alarms, motors, automatic burners, metering devices
and others. |
FS5 |
For general purpose applications
requiring low flow rate sensitivity , its in-line
configuration eliminates the need for a pipe tee. With a single
pole, double throw snap switch, its sensitivity adjusting
screw also makes flow adjustment easy. |
FS7-4 |
Designed for hazardous
environment applications requiring a NEMA 7 (Class
I, Group C or D) or NEMA 9 Class II, Group E, F, or G) rated
flow switch, it has a single pole, double throw snap switch,
with a magnetic switching mechanism. |
FS8-W |
For general purpose applications
with environmental exposure , or those requiring
a water-tight, dust tight, or a NEMA 4X rated flow switch. |
AF |
The Series AF provides a positive
and economical way to detect change or loss of air-flow
velocity caused by a closed damper or fan inlet,
a loose fan wheel, etc. The Series AF1 is designed for medium
and higher velocity systems, while models AF2 and AF3 are
for systems with lower air-flow velocities. |
    
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Boiler Controls - Electronic
Series |
Description |
RB |
The series RB-24, RB-120 and
RB-122 low water cut-offs guard against the dangers of low
water conditions in residential hot water boilers. These UL
â -listed, conductive-type water detection controls
feature a quick-mount probe for easy installation, inspection
and replacement. |
PS-800 |
For residential and commercial
applications, the Series PS-800 low water cut-offs (24v or
120v) are designed for steam boilers up to 15 psi or hot-water
boilers up to 160 psi, 250 ° F. |
PS-850 |
For residential, commercial and
industrial applications, the Series-850 is designed for hot
water boilers with a totally electronic operation, with the
feature of no lock out with the loss of power if the probe
is in water. |
750 |
For commercial and industrial
applications, the Series 750 features electronic circuitry
with remote conductance probe level sensing. Maximum ambient
temperature of 12 0 ° F and voltage across probe to ground
of 14 VAC. |
     
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Boiler Controls - Mechanical
Series |
Description |
42 |
Low Water Cut-Offs for
Steam Boilers
For residential, commercial, and industrial low and medium
pressure steam boilers with a separate water column, the Series
42 is designed for boilers of any steaming capacity The maximum
pressure 50 psi (3.5 kg/cm 2 ). |
47 |
Mechanical Water Feeders
Designed for steam and hot water boilers with cold water
feed, the Series 47 can be used as a mechanical or electronic
low water cut-off. Can be field upgraded with a No. 2 switch
to add water cut-off function. Maximum water supply pressure
150 psi. |
51 |
Water Feeder
Designed for low pressure steam and hot water boilers larger
than 5000 sq. ft. (465m 2) capacity with cold water feed,
the Series 51 can be upgraded with a No. 2 switch to add low
water cut-off function. Maximum water supply pressure 150
psi. |
67 |
Low Water Cut-Offs for Steam Boilers
Designed for gas and oil-fired steam boilers (24v or 120v)
of any size up to 20 psi (1.4 kg.cm 2), the Series 67 Float-Type
Low Water Cut-Off Control provides proven performance and
easy blow down. |
93& 94 |
Low Water Cut-Offs for Steam Boilers
The Series 93 is designed to maintain consistent water level,
regardless of pressure, for commercial and industrial low-
or high- pressure steam boilers of any capacity. Maximum pressure
150 psi and No. 5 switch included. |
150& 150S |
Low Water Cut-Offs for Steam Boilers
The Series 150 Float-Type Low Water Cut-Off Control is designed
for boiler applications up to 150 psi. |
  
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Liquid Level Controls
– Electronic
Series |
Description |
LPC 2000 |
The Series LPC 2000 is used for
industrial and commercial level sensing and pump control of
cooling towers, tanks, water fountains, condensate units,
and others. It utilizes digital technology utilizing a micro-controller,
and has a field selectable control unit allows for single
or multi-level sensing. Also, it directly switches a 1 HP
motor, and has a time delay feature that prevents process
disturbances from water level surges. |
PCH & PCL |
For sophisticated multi-level
control in tanks, boilers and hydronic systems. Features Teflon
¨ coated probes to provide protection from false signals.
No blow down required. Control enclosures are NEMA 1-rated
and remote sensors are NEMA 4-rated. Optional Features include
manual reset switch, alternate pump switch and 28-volt probe. |
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Liquid
Level Controls – Mechanical
Series |
Description |
21 |
Make-Up Water Feeder
The Series 21 is a feeder designed for boiler receiver tanks,
whose direct mount eliminates the need for equalizing connections.
Its soft seat provides positive seal and the maximum water
supply pressure is 150 psi. |
PFC |
The Series PFC is designed for
proportional control of pneumatic valves or relays in heating,
air-conditioning and process systems in hazardous or non-hazardous
locations. It provides an air pressure signal proportional
to the liquid level, and it is available in Direct Acting
and Reverse Acting versions. The maximum water temperature
is 208 ° C. |
VFS |
The Series VFS is a general-purpose
NEMA 1-rated liquid level control for a variety of industrial
and commercial applications such as boilers and tanks, high
and low alarms and pumps. It can also be used in pairs to
start and stop auxiliary equipment between desired levels. |
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 086-0044
 086-0048
 047-0014
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Boilder Controls
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Selection
Guide |
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Low Water Cut-offs |
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For Hot Water Boilers |
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- Electronic - 750,
PS-850,
RB-24,
RB-120,
RB-122 |
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- Float Type - 63,
64,
764 |
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For Steam Boilers |
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- Electronic - 150E/157E,
750,
750-HW-MT-120
(for High Water), 750B,
PS-800 |
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- Float Type - 61,
63,
64,
67,
69,
150,
150S,
157,
157S,
764,
767,
MD
Model Setpoints, Blow
Down Piping |
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Combination LWCO/Pump Controllers
for Steam Boilers |
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- 42,
42S,
93,
94,
150,
150S,
157,
157S,
193,
194 |
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Water Feeders |
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ElectricSeries
WF Uni-MatchÒ, 101-A |
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Mechanical |
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- Combination Mechanical/Low
Water Cut-off |
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47/47-2,
51/51-2,
51-S/51-S-2,
53/53-2,
247/247-2 |
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- Make-up21,
25-A,
221,
551-S,
847,
851/851-S |
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Valves |
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Blow Down 14-B |
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Test-N-CheckÒ
TC-4 |
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Pressure Relief 250,
260 |
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Liquid Level Controls
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Selection
Guide |
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Conductance Actuated
(Probe Type) |
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- General Purpose Sensor and
Controls |
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RS
Sensors, 750B-C3,
Replacement
Electrode Assemblies,
AS
Probes, LPC-2000,
PCH,
PCL,
Remote
Sensor Location/Probe Location,
LPC-2000
Operation & Selection |
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Float Actuated Pneumatic PFC |
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Float Actuated Switches 65,
165 |
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Float Actuated Valves 18,
27-W,
3155 |
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Flow Controls
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Products Overview
Flow Switches
Electronic - Boiler 
