HEATING COMPONENTS
1
Robertshaw® proprietary and confidential ©2014
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Ignitors
Pilots / Thermocouples / Thermopiles
Air Pressure Sensing Switches
Heating Kits
Manufacturers Comparison
Literature
Website
Q&A
 Universal Ignitor Kits
 Product Advantages
 Silicon Nitride Ignitors
 Product Features
 Manufacturer Analysis
Hot Surface Igniter Types
 Robertshaw® 41-400 Series
 Silicon Carbide
 Robertshaw® 41-400N Series
 Silicon Nitride (stronger)
 Robertshaw ® Universal 41-800
Series
 Kitted with brackets and screws
 Kits include mounting brackets and hardware for contractor
convenience
 Low cost and universal usage
 Packaging is clam shell style for additional protection
 Peg board ready
 Replaces 130 competitor parts
 See Sell Sheet 150-2185B for cross reference charts
41-803 is a GOOD offering
 Silicon Carbide for good physical strength
 Double helix spiral uses less current
 1 Year Warranty
41-801N is a BETTER offering
 Silicon Nitride technology for better durability
 Rod shaped heating element
 2 Year Warranty
41-802N is the BEST offering
 Ultimate Silicon Nitride for best durability
 Made by Kyocera™
 Flat blade heating element
 Best heat dissipation
 3 Year Warranty
 What is Silicon Nitride?
 A light, hard material with low thermal expansion coefficient
 Typical characteristics of Silicon Nitride (SiN) include:
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High Mechanical Strength
Fracture resistance – stronger than Silicon Carbide
Good thermal shock resistance
Good chemical resistance
Resistant to deformation at room and elevated temperatures
Longer Usable Life
 Unlike Silicon Carbide which has a porous construction, Silicon
Nitride is non porous and does not oxidize with age
 Silicon Nitride ignitor elements can be cleaned with tough
cleaners and can withstand strong alkali’s and acids
 Due to its outstanding performance, Silicon Nitride offers
peace of mind to the home owner when the temperatures dip
into the low teens during the winter months
 2 Year Warranty
 17 seconds or less to operating temperature – 1800°F
 All ignitors are 120V AC
 Ignitors are kitted with mounting hardware and OEM termination
or ceramic wire nuts
 Durable, robust and resistant to dirt and oil
 High temperature leads for wire protection
 Flame sensor required for all Silicon Nitride ignitors
 Less breakage during installation and servicing
 12 SKUs available
 Trusted Robertshaw® brand
Feature
Robertshaw®
Crystal
Technica
MARS®
Series
41-400N
Glo-Stix 120- 67900
400
Supco
SSN2000
Replacement OEM
Hardware
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OEM Termination
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Passes 2 Meter Drop
Test
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NA
Pros and Cons
Robertshaw®
Competition
Replacement OEM
Hardware
Easier installation ensuring
that
the igniters is placed in
position Correctly
Hardware with multiple
holes making it less durable
with variation in the
placement of the hot zone
OEM Termination
Quick tool free installation
Longer install time
Passes 2 Meter Drop Test
Durability for easier
installation
and handling
Fragility defeats one of the
purposes of SiN
What allows silicon nitride igniters to work in HVAC Heating
applications?
□ Low thermal expansion coefficient
□ High Mechanical Strength
□ Fracture resistance
□ All of the above
Silicon Carbide has a porous construction, Silicon Nitride is non
porous and does not oxidize with age?
□ True □ False
Pilot Basics
• Robertshaw® 1820 Series with Left or Right flame pattern type
• Pilot Uni-Kits® are with or without thermopile pre-mounted
•Used On
DC CURRENT
AC CURRENT
Flame Rod
(Smaller)
Flame Ground
(Larger)
PILOT / BURNER
– IPI Intermittent Pilot Ignition
– DSI Direct Spark Ignition
– HSI Hot Surface Ignition
How it Works
• Rectifies AC Current into DC
• Requires flame to ground
• Proves pilot or burner ignition
GND
“Hot” Junction
Copper-Nickel
Alloy
Copper-Iron
Alloy
“Cold” Junction
Insulated
Copper
Wire
Copper Sheath
Contact
Button
UUUUUUU
Load
(Safety Magnet)
Fitting
Nut
Contact Button
• The 1980 series offers easy installation into most pilot burners
• Uses Snap-Fit® technology
• End of part number refers to various lengths:
• 1980-012 is 12 inches
• 1980-072 is 72 inches
• The 1950 series thermopiles have two lead wire connections
and are primarily used in HVAC
• The 1951 coaxial series used on Commercial Cooking
Twin lead
wires
• Monitors Air Pressure
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Conditioned Air Filters
Defrost Cycle in Refrigeration Coils
Gas-Fired Units with Draft from the Blower
Air-Supported Structures and Enclosures
Exhaust Fans and Fume Hoods
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NEMA
NC
NO
PSI
SPST
SPDT
WC
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National Electrical Manufacturers Association
Normally Closed (switch)
Normally Open (switch)
Pounds per Square Inch
Single Pole Single Throw
Single Pole Double Throw
Water Column in Inches
• Reliable devices to remotely sense operation of
– Fans
– Blowers
• Senses positive, negative or differential air pressure
– Maximum pressure 10.0“ Water Column
• Adjustable air sensing actuates internal switch
• Types of switches
– SPST = Single Pole Single Throw
– SPDT = Single Pole Double Throw
• Robertshaw line up of air pressure switches is Simply the Right Choice™ for
flexibility, reliability, accuracy and ease-of-use
• With a wide array of applications, the 2374-510 kit replaces hundreds of other
manufacturers’ air pressure switch models
• HVAC contractors now have a one-stop option to meet all their air pressure
switch needs
• This latest addition to the Robertshaw product line includes:
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High impact polycarbonate housing
Works in a variety of harsh conditions
Snap-acting switch with three male 90º quick-connect terminals
Field adjustable set points ranging from 0.10” to 10” WC
Installers use 10-650 sensing probe kit for hard-to-reach air streams
• Sensing switch 2374-510 is field adjustable
• Relatively insensitive to temperature
• Range includes -40°F to 190°F
• Operates at 120 or 277 VAC
• Detection of static pressure drop across filters and coils
• Air switches can turn ON or OFF the following
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Blowers
Exhaust Fans
Electronic air cleaners
Remote status indicators
Alarms
Control circuits
And more
•Sensing Switch 2374-510 contractor kit includes the
following:
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Calibration Springs (5 options within 0.05” to 10.0” WC)
Orifice Restrictors (4 options)
Mounting Brackets (2 options)
Calibration adjustment tool (hex wrench)
• Easy installation and calibration
• 2 Year Warranty
• Housing is made of plastic to compete on price
•When extended tube is needed for hard-to-reach air
streams use Robertshaw® Sensing Probe Kit 10-650
•Probes are used in conjunction with the air switch as a
means to sense air pressure in the appliance
• Probes are mounted in:
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Ducts
Intakes
Vents
Pressure Control Rooms
All HVAC Applications
Typical Applications For
Sensing Switch and Sensing Probe
Kit
1
Positive static pressure increases as the
filter gets dirty.
2*
Differential across filter changes as filter
gets dirty.
3
Flow is reduced as filter gets dirty.
4
Fan operation or air flow with little or
no static pressure.
5
Negative pressure increases as the filter
gets dirty.
6*
Fan operation and true air flow with
varying amounts of static pressure.
Probes must be perpendicular to the air
flow.
* Applications uses two Sensing Probe Kits
Fan
Filter
Fan
Filter
Fan
SPDT switch stands for what?
1.
2.
3.
4.
Single Pole Differential Terminal
Single Polarity Dip Termination
Single Pole Double Throw
Single Pole Single Throw
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Robertshaw® 2374 series
Honeywell® IS2 series
Micro Pneumatics Logic® MPL 9370 series
Endura® ES2000 series
White-Rodgers®
Siemens®
Features
Robertshaw®
Honeywell®
MPL®
Endura®
2374-510
IS2
MPL9370
ES2000
Complete
Installation Kit
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Full Line of
Replacement
Switches
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Self Cleaning
Contacts
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Series
Wider
Operating
Range
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(up to 10.0 “ W.C.)
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(3” W.C.)
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(2” W.C.)
Product cross references at www.uni-line.com
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(5” W.C.)
Robertshaw®
Competition
Complete
Installation Kit
Easier Installation with all Necessary
Hardware and Tools Included
Incomplete Kit Complicates
Installation
Full Line of
Replacement Switches
One Source for All Major
Replacements with Cross Reference
Charts
Multiple Suppliers Needed
and Possible Obsolescence
Self Cleaning Contacts
Helps Resist Welding from Arcing
Switch May Stick and Need
Service Calls
Rated for More
Applications
Rated for Fewer Applications
Made in the USA
Majority Imported
Pros and Cons
Wider Operating
Range
US Jobs
Value
Proposition
Wholesaler /
Distributor
Contractor
End-User
Complete
Installation Kit
“One Stop Shop”
Offering Includes
Hardware & Tool
“Grab and Go”
No Need to Wonder
About Right
Installation Tools
“Hi and Bye”
Installer
Minimizes
Disruption
Full Line of
Replacement Switches
Limits Need for
Carrying Several
Suppliers
Full Selection From
One Source
Installer has
Right Part
Regardless of
Application
Upsell Reliability
Opportunity
Limits Call Backs
Reliable
Operation to
Minimize Future
Service Calls
Additional
Feature to Sell
Wider Range of
Applications
Quality Product
Self Cleaning
Contact
Wider Operating
Range
Cross Reference available online at:
www.robertshaw.com/Products/Cross-Reference
• Sell Sheets with Cross Reference Charts
– Part Number in English: 150-2314
Literature available online at www.Uni-Line.com
UNI-KIT 360
MILLIVOLT KIT
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Millivolt Heating Kit
Uni-Kit 360 Heating Repair Kit
Applications
Sales Support Tools
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Millivolt Kit is updated
New pricing
New packaging
New mercury-free thermostat
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Universal Kit 360
All universal parts
Replaces 1600 parts in field
Reduces inventory with easy-to-order SKU
Reduces installation time with right parts
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Gas Valve 710-502
Thermostat 986-1R
Pilot 1820-009
Plus Free
 Pocket Guide
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Low capacity gas valve 710-502 used in space heaters
Designed for natural gas applications
Natural gas max 70,000 BTU, ½” inlet and outlet
Nat to LP conversion kit 1751-013 included
 Economy mechanical Robertshaw® thermostat 986-1R
 Simply reliable with easy installation
 24V AC with UL Listing
 Robertshaw® 1820-009 with 90° right flame pattern
 Pilot Uni-Kits® with thermopile 1950-532 pre-mounted
 Replaces ITT-General part number PG9A42JTL02
Wall Thermostat
Gas Cock
Safety
Pilot Line 
Operator
Pilot and
Thermopile
Safety
Magnet
OPERATOR
TH/TP
R
TP
W
Safety
Magnet
OPERATOR
TH/TP
TP
TP
R
W
TH
1950 Series
Two-Lead
Thermopile
TH
1951 Series
Coaxial
Thermopile
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Gas Valve
Ignition Control Module
Nitride Ignitor
Flame Sensor
Air Pressure Sensing Switch
Plus free tools
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Robertshaw® Toolbag
Robertshaw® Screwdriver
Pocket Guide
Cross Reference Guide
Reorder form
 Gas Valve 720-079
 Universal model
 Intermittent Pilot
 Direct Spark
 Hot Surface
 150,000 BTU, ½” inlet and ¾” outlet
 Factory set at 3.5” W.C. for natural gas
 Can be converted to LP with conversion kit included
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Universal hot surface ignition module kit 780-910
Designed for gas fired systems
Diagnostic green LED for quick troubleshooting
Kit includes all necessary hardware
Replaces most hot surface modules manufactured
by Robertshaw®, Honeywell® and White-Rodgers®
 Local or remote sensing
 120V AC units
 Hot Surface Igniter Types
 Silicon Nitride
 Silicon Carbide (fragile)
 Robertshaw® 41-802N
 Silicon Nitride
 Brackets included
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Flame Sensor 10-760
Rod can withstand 1800 °F
Rod is 4” and can be cut and bent
Replaces White-Rodgers 760-401
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56
Universal Air Pressure Sensing Switch 2374-510
Senses air flow from 0.10” to 10.0” W.C.
Switch controls wide variety of HVAC applications
Kit includes springs, orifices, mounting bracket
Calibration hex tool included
 Robertshaw® replaces 1,600 solutions
 Not all kits have the same parts
 Uni-Kit 360 equivalents:
 50M56U-843 White-Rodgers ®
 Y8427U9045 Honeywell®
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Natural Gas or Liquid Propane
Inlet and Outlet Size
BTU Requirement
Ignition Method being Used
Outlet Pressure Setting Requirement
Ambient Temperature
Orientation of Gas Valve
 Valves should not to be mounted upside down
 Actuator Type: Manual, Millivolt, Voltage, Hydraulic
 Opening and Closing Speed of Gas Valve
Condition
Flame Too Large
Noisy Flame
Yellow Tip Flame
Floating Flame
Possible Cause
Possible Cure
1. Outlet pressure too high
1. Adjust regulator
2. Defective regulator
2. Replace regulator
3. Orifice too large
3. Replace Orifice
1. Excessive primary air
1. Adjust air shutter
2. Noisy Pilot
2. See Pilot Troubleshooting slide
3. Burr in orifice
3. Remove burr or replace orifice
1. Too little primary air
1. Adjust air shutter
2. Clogged burner ports
2. Clean burner ports
3. Misaligned orifice
3. Realign orifice and burner
1. Blocked venting
1. Inspect vent and clean
2. Insufficient primary air
2. Adjust air shutter
Condition
Delayed Ignition
Failure to Ignite
Burner won’t turn “Off”
Rapid Burn Cycles
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Possible Cause
Possible Cure
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2.
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4.
Improper ignition location
Pilot flame too small
Burner ports clogged
Low outlet pressure
1.
2.
3.
4.
Reposition ignition source
Check orifice and clean
Clean burner ports
Adjust pressure regulator
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2.
3.
4.
Main gas “Off”
Poor electrical connections
Defective gas valve
Defective thermostat
1.
2.
3.
4.
Open manual valve
Check, clean, & tighten
Replace with new
Replace with new
1. Poor thermostat location
2. Defective gas valve
3. Defective thermostat
1. Relocate thermostat
2. Replace with new
3. Replace with new
1. Clogged furnace filters
2. Excess t-stat anticipation
3. Poor thermostat location
1. Clean or replace
2. Adjust t-stat anticipator
3. Relocate thermostat
When all else fails…check gas supply is in the “ON” position
Condition
Solution
Correct Flame
 Tip of thermocouple or thermopile is
 3/8” to 1/2” into pilot flame
Noisy, Lifting, Blowing Flame
 High gas pressure
 Wrong Pilot Orifice
Lazy Yellow Flame
 Clogged primary air opening
 Low gas pressure
 Clogged pilot orifice
Wavy Blue Flame
 Draft condition as pilot
Hard Sharp Flame
 High gas pressure
 Pilot orifice too small
Small Blue Flame
 Wrong pilot orifice size
 Low gas pressure
 Clogged pilot tube
Open circuit 25 to 30 Millivolts
HOT
JUNCTION
30 MV
COLD
JUNCTION
CONTACT
BUTTON
MILLIVOLT
METER
Hot
Junctions
Cold
Junctions
UUUUUU
Load
(Safety Magnet)
UUUUUU
Load
(Gas Valve)
1950
Twin Lead
Connector
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Problem # 1: Hot Surface Igniter Does Not Glow Red
Possible Causes
– No main power
– Faulty Transformer
– Faulty Thermostat- check call for heat
– Faulty Limit Switch
– Faulty blower interlock switch
– Faulty hot surface igniter
– Faulty ignition control
– Remember to wait for purge time, 17 or 34 seconds
Troubleshooting
– With power on and thermostat at its highest position, check voltage between “TH” and
“TR” on HS780 module.
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If 24 Volts not present, check transformer output
If no 24 Volts present on secondary side, change transformer
Check for 120 Volts at the igniter across “IGN” and “GND”
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If voltage present, change igniter
If no voltage present, change module
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Problem # 2: Igniter Glows Red but Main Burner Will Not Light
Possible Causes
– Improper Igniter or Sensor Alignment
– Faulty Ignition Control
– Faulty Gas Valve
– High Inlet Gas Pressures
– Polarity Reversed
– No Earth Ground
Troubleshooting
– Check availability of gas at gas valve. Make sure valve upstream is in the Full On position. Check
pressure ok.
– Check “GRD” and “PV/MV” by reversing wires
• If reversed the gas valve will not open.
– Check proper ignition position and properly grounded
– Check for 24 Volts at gas valve terminals
– “1” and “2” on a 7200 series, “TH” and “TR” on a 7000 series
• If Yes, check wire resistance or change gas valve
• If no, change the 780 series module
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Problem # 3: Main Burner Shuts Off before the Thermostat is Satisfied
Possible Causes
– Improper Igniter or Sensor Alignment
– Faulty Ignition Control
– Contaminated Igniter and/or sensor
– Bad burner ground
Troubleshooting
– Check polarity
– Check for proper igniter position
– Check for proper ignition control grounding
– Visually inspect igniter and remote sensor for any contamination.
• Clean and replace
– Check main burner ground
– If above steps are ok, replace igniter
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Problem # 4: Main Burner Does Not Shut Off When Thermostat is Satisfied
Possible Causes
– Faulty Gas Valve
– Faulty Ignition Control
Troubleshooting
– Check thermostat to make sure contacts are open
– Check for 24 Volts between “TH” and “TR”
• Should be Zero, if gas valve is stuck open, replace valve
– Check for 24 Volts between “PV/MV” and “GND”
• If 24 Volts present, replace ignition control
• If 24 Volts not present, replace gas valve
Telephones:
Technical Service
1-800-445-8299
Technical Service Fax
1-630-260-7294
Customer Service
1-800-304-6563
Customer Service Fax
1-800-426-0804
Websites:
Uni-Line® Catalog: www.robertshaw.com/Uni-Line
Cross Reference: www.robertshaw.com/Products/Cross-Reference
Toolbox: www.robertshaw.com/toolbox/Toolbox-Main
General Information for:
Robertshaw®, Paragon®, Ranco®, Uni-Line® and Publication Zone®
Robertshaw®, Paragon®, Ranco®, Uni-Line®, and Make the Connection™ are propriety marks of Robertshaw or its subsidiaries.
All third party trademarks and service marks are the proprietary marks of their respective owners.
© 2016 Robertshaw. All rights reserved.