Low Capacity Gas Valves & Accessories UNI-LINE® PRODUCT KNOWLEDGE © Copyright Invensys Controls 2009
Subjects We Will Cover In This Session Fuel Characteristics Gas Valve Applications Robertshaw® 7000LC (Low Capacity) Series Hydraulic Actuated 24 Volt Actuated Millivolt Actuated 7500 Series - Coming Soon! Manufacturers Pilot, Thermocouple, and Thermopile Basics Website Tools When You Have Questions Q&A
Acronyms BTU = British Thermal Units LC = Low Capacity LP = Liquid Propane MV = Main Valve NAT = Natural Gas PD = Pressure Drop PV = Pilot Valve SLC = Snap-action Low Capacity V = Volts WC” = Water Column inches
Fuel Characteristics Natural Gas Characteristics Liquid Propane (LP) 0.64 Specific Gravity 1.53 1000 BTUs / Cubic Feet 2500 7”WC – 10.5”WC Service Pressure Range 11”WC – 14”WC 1200º F Ignition Temperature 950º F 10/1 Combustion 24/1 Air/Gas Ratio Natural gas is lighter than air and rises L.P.
Fuel Characteristics of British Thermal Units Definition of a BTU – The quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit Many gas appliances are rated depending on BTU output – The more heat needed, the higher the BTU rating Residential gas water heaters (regardless of fuel) are rated between 15,000 and 75,000 BTU Over 75,000 BTU is considered Commercial Water Heater Commercial Water Heaters are rated between 75,000 and 750,000 BTU
Space Heating and Hearth Applications Factory Model Uni-Line® Part Number BTU @ 1” PD Natural Gas Catalog Page Liquid Propane 7000 STD Nat 300,000 Min - Max BTU Capacity Pages 68-82 LP 485,000 10,000 – 900,000 7200 Nat 150,000 15,000 – 200,000 Uni-Line 720 Pages 85-87 LP 240,000 15,000 – 320,000 2000 DER/IPER Nat 125,000 25,000 – 170,000 Uni-Line 722 Page 88 LP 200,000 25,000 – 272,000 7500 Nat 100,000 6,700 – 160,000 Coming Soon! LP 162,000 12,000 – 226,000 Nat 40,000 5,000 – 7
000LC (Low Capacity) Factory Series Most popular Low Capacity Uni-Line® part is 710-502 Designed for: – Standing Pilot only – OEM replacements Incorporates the following: – Manual Valve – Pilot Valve – Main Gas Pressure Regulator Applications include: – – – – Patio Heaters Recreation Vehicles Wall Furnaces Fireplace Hearth 710-100 Series 710-200 Series 710-400 Series 710-500 Series Manual Hydraulic 24 Volts Millivolt
7000LC (Low Capacity) Example Factory Number is 7000MVRLC Contains MV for Millivolt Actuator Contains R for Regulated Contains LC for Low Capacity Uni-Line® Part 710-502 BTU rating range is 5,600 - 70,000 Regulator is 3.
7000LC Hydraulic Actuated Gas Valve Most popular Hydraulic Snap-Action part is 710-205 Add “S” to Factory Part for Snap-Action ie.
7000LC 24 Volt Actuated Gas Valve Most popular Uni-Line® part is 710-402, Factory Part 7000-ERLC Wall Thermostat 24 VAC 120 VAC Transformer ECO (Limit) High Limit NC Fan Control NO Gas Cock Operator Fan Motor Pilot and Thermocouple
7000LC Millivolt Actuated Gas Valve Wall Thermostat ECO (Limit) Gas Cock Safety Pilot Line ⇒ Operator Pilot and Thermopile
7000LC Millivolt Actuated - Wiring Most popular part is 710-502 Factory model is 7000MVRLC Safety Magnet OPERATOR TH/TP R W TP TH 1950 Series Two-Lead Thermopile
7500 Series Gas Valve – Coming Soon! Designed for: – OEM replacements – Smaller Locations Incorporates the following: – Manual Valve – Pilot Valve – Main Gas Pressure Regulator – Field Convertible without additional components Applications include: – Central Heating Units – Wall Heaters – Hearth Fireplaces
Gas Valve Manufacturers Markets Robertshaw® Honeywell White- Rodgers Dexen SIT USA based Engineering and Technical Services USA based Engineering and Technical Services USA based Engineering and Technical Services Taiwan based Italian based Engineering and Technical Services No Engineering nor Technical Services Space & Central Heating Yes Yes Yes Yes Yes Residential Water Heating Yes Yes Yes No Yes Hearth Products Yes Yes No Yes Yes Pilots, Thermocouples, Ignition systems Yes
Robertshaw® Gas Valve Accessories Pilots Thermocouples Thermopiles
Pilot Basics
Pilot Parts Order 1820 Series with Left of Right flame pattern type Pilot Uni-Kits® are with or without Thermopile pre-mounted
Thermocouple Basics “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
Thermocouple Parts 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
Thermopile Basics Hot Junctions Cold Junctions UUUUUU Load (Safety Magnet) UUUUUU Load (Gas Valve) 1950 Series Twin Lead Connector
Thermopile Parts The 1950 series thermopiles have two lead wire connections and are primarily used in HVAC applications Note: The 1951 coaxial series used mostly on Commercial Cooking applications Twin lead wires
Quiz Question #1 What is the difference between thermocouples and thermopiles? A. B. C. D.
Find Answers On www.Uni-Line.
When You Have Questions Technical Service 1-800-445-8299 Fax 1-630-260-7294 Customer Service 1-800-304-6563 Fax 1-800-426-0804 Uni-Line® Catalog Website: www.Uni-Line.com Cross Reference Website: www.uni-line.com/templates/xrefsearch.aspx General Information Websites: Robertshaw®, Paragon®, Eliwell™, Ranco®, and Publication Zone® www.InvensysControls.com www.RobertshawTstats.com www.ToolBox.InvensysControls.com/templates/Login.
