Get Control McDonnell & Miller Only/Techni… · Available with snap action switches Series 150/157...
Transcript of Get Control McDonnell & Miller Only/Techni… · Available with snap action switches Series 150/157...
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Doing One Thing Well’
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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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