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Doing One Thing Well’

McDonnell & Miller

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LOCALSTATE

FEDERALUBC

BOCAICC

NFPAANSI

ASME

• UL• CSA• FM

•LISTED•LABELED

THE AUTHORITY HAVING LOCAL JURISDICTION

Codes & Standards

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ControlA device designed to regulate...

Control, LimitAn automatic safety control...

Control, OperatingA control, other than safety control or interlock,...

Control, Primary SafetyA control responsive directly to flame properties...

Control, SafetyAutomatic controls and interlocks…to prevent unsafe...

Low Water Fuel CutoffA device which prevents firing...

Codes & Standards

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Codes & Standards

Water LevelsMaximumPreferredMinimum

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Pump On/OffBoiler On/Off

Basic Control

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Secondary LWCOManual Reset

Pump ControlPrimary LWCO

Automatic Reset

Basic Control

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Typically installed on boilers used in commercial and industrial applications with operating pressures up to 150psi

Used to operate a pump to maintain water level in boiler

Low water cut-off switch to interrupt burner circuit

Available with snap action switches

Series 150/157 & 150S/157S Controls

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Float reacts to the water line As water level moves

up/down, the float transfers that motion to a switch

Series 150/157 & 150S/157S Controls

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Units have a monel bellows which is pressure sensitive. The operating points will drift as pressure decreases.

Series 150/157 & 150S/157S Controls

-0.20.00.20.40.60.81.01.21.41.6

0 30 60 90 120 150

PUMP OFF

BURNER ONPUMP ON

BURNER OFF

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Standard Models ‘MD’ Models

Pump OffPump On

3/4” Differential

1 3/8” Differential 1 13/16” Differential

Switch setpoints at 150psi

Series 150/157 & 150S/157S Controls

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Boiler Flooding

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Boiler Flooding

Symptoms

Boiler Feed Pump Not Turning Off

What To Look For

Low Pressure (<15psi)

Direct Start of Motor (no relay)

Frequent Pump On/Off

Running Amps Greater Than 7.4

Cause

Pump Not ‘Balanced’ or ‘Throttled’

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Product Information

Series 150/157 & 150S/157S Controls

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Series 150E/157E Controls

Electrical current is sent from control unit through probe and out probe tip

Current passes through water and back to control unit via metal surfaces

Control unit senses if circuit is completed and operates relays

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Series 150E/157E Controls

Adjustable Burner-Off Time Delays Two Pump Differentials Redundant Low Water Cut-off Redundant Pump Cut-off 1 HP Relay Contacts Maintains Differentials through

Pressure Range Diagnostic LED’s

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150E

LWCO & Power LED’sTest & Reset Buttons

Field AdjustableTime Delay(0- 60 Seconds)

Diagnostic LED’s

Probe Connections(high, middle & low)

Series 150E/157E Controls

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Flange in‘A’ Position

Flange in‘B’ Position

3/4” 1-3/16”

‘B’tab

‘A’tab

Series 150E/157E Controls

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150 (mercury), 150S (snap switch) & 150E (probe) Head Mechanisms are Interchangeable

150E Head

150/150S Head

Series 150E/157E Controls

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Series 750B Controls

LWCO or Feed Water Combination

LWCO/Feed Water

Dual-Function

Tri-FunctionModular

Panel Mount

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Series 1575 Level Control

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Series or 157S

Series 157E

Series 750B Products

Which Control To Use

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Secondary LWCOManual Reset

Pump ControlPrimary LWCO

Automatic Reset

750-MT-120 LWCO

RS1-BR1 Sensor

157 LWCO/pump

controller

Series 750 LWCO

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Features:— Green Power On LED— Red Low Water LED — CSD-1 Memory— Test Switch on All Models— 20,000 ohms Sensitivity— Knockouts On Rear of Chassis for

Direct Mounting to a ‘PS’ probe

Series 750 LWCO

MemoryOther 750Other Prod

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Series 750 LWCO

750P-MT-120with PA-800

Probe

750-MT-120Control

RS-1-BR-1RemoteSensor

Hot Water Boiler Applications

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Series 93/193 used in applications with operating pressures up to 150psi

Series 94/194 used in applications with operating pressures up to 250psi

Available with contacts for on/off control or resistor/slide wire for proportional control of water level

Low water cut-off switch to interrupt burner circuit

Series 93/193 & 94/194 Controls

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PUMP OFF 0.125"PUMP OFF 0.125"

.563”

BURNER ON 0.125"BURNER ON 0.125"

PUMP ON 0.125"PUMP ON 0.125"

.875”

BURNER OFF 0.125"BURNER OFF 0.125"

Tower tube construction which is not sensitive to pressure

Operating points are the same no matter what the operating pressure

Series 93/193 & 94/194 Controls

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7B SwitchProportional Control

For Feed Water Valve Modulation

Series 93/193 & 94/194 Controls

135 ohm Signal

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Positive Shutoff ValveBall Valve or Gate Valve

Throttling ValveGlobe Valve or Plug Valve

Connecting lines to boilershould be straight runs

Piping must be pitched to drainwith no restrictions or reduction in pipe size

Collapsed or crushed floatson high pressure boiler applications

can be prevented.

1. Follow installation tips shown2. Open ‘Throttling Valve’ slowly

until drain piping heats up.

Series 93/193 & 94/194 Controls

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Proportional control used to operate a pneumatic valve to maintain a constant water level

Used in applications with operating pressures up to 250psi

Tower tube construction which is not sensitive to pressure

Series PFC

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Series PFC

2” Differential Set At Factory (adjustable in field)

3 to 15 psi Signal Reverse or Direct Acting

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Finger Float for use Primarily on Steam Boilers

Most Often Used As Secondary LWCO with Manual Reset Switch

#11 Switch

Series 61 LWCO

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Primarily For Use on Hot Water Boilers

Most Frequent Use Is On Deaerators and Condensate Receivers

#11 Switch

Series 64 LWCO

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Used on Both Steam and Hot water Boilers

Best Control to Use as High Water Alarm

#2 Switch

Series 63 LWCO

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Green ‘Power On’ LED Red ‘Low Water’ LED Test Button 10 Sec. Delay on Break 15 Sec. Delay on Make No lockout with loss of

power PS-802 Models meet ANSI

Z21.13a Specification

Series PS/PSE-800 LWCO

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For Boilers of Any Steaming Capacity

Quick Hook-Up Fittings Lever Operated Full

Port Ball Valve Dual Switches (#11) for

Independent Control of Burner Circuit and Water Feeder

Series 67 LWCO

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Proportional Feed Action

Quick Hook-Up Fittings Lever Operated Full

Port Ball Valve Replaceable Cartridge

Usually Installed with No. 2 Switch

for Low Water Protection

Series 47 Feeder/LWCO

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Available in 24 Volt and 120 Volt Models

Manual Feed Button Replaceable Cartridge

Series 101A Feeder

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Available in 24 Volt and 120 Volt Models

Manual Feed Button Field Selectable

Delay/Feed Cycles Adjustable Flow Rate

(1, 2 & 4 GPM)

Series WF/WFE Feeder

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Pump Control Switch Burner Cut-off Switch 50psi ‘A’ Model Has Quick Hook-

up Fittings

Series Level Control/LWCO

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Mechanical water feeders typically installed on deaerator, condensate receiver or boiler feed tanks

Series 21 has flange for direct mounting on tank

Series 25A has float chamber for installation using equalizing lines

Series 21 & 25A Feeders

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Mechanical water feeders.

Available with #2 switch

Typically installed on boilers.

Might be installed on deaerator, condensate receiver or boiler feed tanks

Float chamber for installation using equalizing lines

Series 51, 51S & 53 Feeder

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Installed to test float type LWCO’s on Hot Water Boilers

Restricts water flow when blow down valve is opened

TC-4 Valves

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In normal operation, there is normal circulation of water through the equalizing piping and float chamber.

Any sudden onrush of water, such as opening the blowdown valve, snaps shut a damper to restrict flow.

When blowdown valve is closed, dampers return to normally open position.

TC-4 Valves

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TC-4 Valves

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Hot Water BoilersLWCO Bypass2nd LWCO - Steam

?

Flow Switch?How Creative Can We Be

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kmiller

Rectangle