Control Valves RBERThO S Aw 24 VOLT dUAL cOmBinATiOn GAS VALVES ROBERTShAw 700 SERiES miLLiVOLT GAS VALVES ROBERTShAw inTERmiTTEnT piLOT, diREcT SpARK OR h.S.i. GAS VALVE. 720 Series Pilot Ignition Gas Valve designed for all three applications. Designed for a wide variety of 24V heating applications. Steps for adjusting the Robertshaw gas Valve on your CWT heaters. OF GAS IGNITION SOURCE PREPURGE TYPICAL IGNITION HARDWARE INCLUDES RESIDEO WHITE-RODGERS ROBERTSHAW JOHNSON CONTROLS S8910U1000 Line volt hot surface ignition 1 or 2 Rods P 1 or 3 4 or 7 sec. 3 trial mode only 1.5 sec. Nat or LP Switched Mains 32 sec. Norton 201, Norton 271, Hot surface elements, Q354 flame rod.
- Robertshaw 7200 Gas Valve Manual
- Robertshaw 7200er Gas Valve Manual
- Robertshaw Gas Valve Model 7000
- Robertshaw 7200er Gas Valve Manual Instructions
- Robertshaw 7200er Gas Valve Manual System
- Robertshaw Millivolt Gas Valve Instruction
Comments
- gas valve diagnostics
heat guys,
I remember a service call I did a year or two ago that left me feeling a little jostled. I'm trying to get some advice so I can feed my Palm Treo with some good info (I have a good library of technical notes going). Unless I'm simply ill-informed, there is no data on ohm readings for gas valve coil windings. I would very much enjoy having some guidlines on this.
Tim, if your out there you helped me out on this when this happened, I even mailed you the bad valve so you could possibly use it in you classes.
Thanks for any help on this!
gary
To Learn More About This Professional, Click Here to Visit Their Ad in 'Find A Professional'Gary Wilson
Wilson Services, Inc
Northampton, MA
www.wilsonph.com
[email protected] - Gary, I have
most of that data in my books at the training center. I will look it up for you on Monday and post it here in case others are also interested.
Most of the gas valves I've seen were between 20 and 100 ohms. However, the old Carrier 3 wire gas valves(the blocky ones with 5 terminals) had resistances as high as 230 ohms and still worked.- 0·Share on Google+
- Actually Rob the heater element was isolated from the gas
its job was to delay bringing the valve on . They were called time delay valves. The other valve manufactuerers Honwywell, White Rodgers and Robertshaw also had these valves.
The pick and hold valves where first devloped by White Rodgers and used on gas dryers. They later found there way into use on heating systems and Robertshaw had a system also that was used with a mercury pilot.
The old Bryant time delay valves Models 638, 639 and 640 I believe were made by Bryant I do not think UTEC ever produced a gas valve.
The time delay principle is still in use today. - Its probably
just about the only control they don't make. I've wondered why HW or WR seems the best the control of oem choice.
Edit.. and I'll bet the new TDR gas controls do not use a resistance heater or do they?? - What does TDR stand for
I may know them by a different title? - Gary, here you go
Let me first say that using Ohms readings on gas valve coils is not the best way to troubleshoot them. One of the reasons is that some gas valves today use a diode built into the gas valve. This means that when 24 Volts AC is fed to the valve it is convertd to DC before it goes to the coil. So the reading you would get when going across the diode would be infinity on one side and resistance on the other. You are better off using proper 24 volt troubleshooting procedures which I teach in my classes that are foolproof. You can also look at the amperage draw of the gas vale and then using an Ampmeter see if it matches up.
Here because you have asked are some resistance readings for gas valves.
Honeywell VR8200 & VR8300 Series (Has a diode) 50 ohms one way 85 ohms the other.
Honeywell V800 series (Older valves) 30 ohms
Robertshaw 7000 series 50 ohms
Robertshaw 7200 series (New with red lever) has diode 55 ohms one way infinity the other way.
Robertshaw (700-406) and Honeywell(VS820 and VS821) self generating valves (Powerpile) the coils are 1.5 to 2.0 ohms and the power units are 11 ohms.
Honeywell VR8345 Universal repalcement PV to MV/PV 30 ohms one way infinity the other due to diode. MV to MV/PV 85 ohms one way infinity the other due to diode.
Robertshaw 720-079 Universal replacement gas valve P to C 50 ohms M to C 100 ohms
Most White Rodgers valves 36C, 36D and the new 36E are solenoid valves and will read around 90 ohms across the solenoid.
Hope this helps. - Tim, A Q for you
Just for my own curriousity, what or why would anybody even care what the ohms on the coils are, (unless commercial expensive valves) if the valve dont open it's bad. right? Just looking to see if I may be not doing my job correctly. I dont have time to ohm out a coil,..If I am applying power and the valve does not open you bet I will replace it. - Yes that is correct
just be careful that you do not have a broken ground wire after the gas valve. The way to prove that is this: if you have 24 volts to the valve and the burner does not light (assuming the gas is okay) then check on the other side of the valve you should have '0' zero volts, if you read 24 volts on both sides of the gas valve you have a broken ground wire. Then to prove the broken ground wire run a new wire back to the 'C' common terminal of the transformer the valve should work. Thats it your done problem solved. - gas valves
Tim's insightful as usual. True 99% of the time if you have power and no flame you have a bad valve. Sometimes though, and this will get you with spark pilot the gas is restricted and while the pilot lights fine the main burner doesn't so, watch the upstream gas pressure gauge when the valve is powered and then move to manifold pressure if upstream is OK. Also, some power stealing stats have you seeing 24 volts with a good digital meter when a test light won't light because of the ultra low amps, then there's the shorted valve that takes out your tfmr, if you ohm the coil and see it's too little ohms on both sides you have a tfmr or fuse killer. It's an interesting business. - valves
Yes, 99% seems like a good number to me. It's that 100th one that will bite you firmly. The issue I had was continuous call backs, so on the 3rd visit I brought a new valve and compared the ohms and sure enough I saw a difference and replaced it.
Gary
To Learn More About This Professional, Click Here to Visit Their Ad in 'Find A Professional'Gary Wilson
Wilson Services, Inc
Northampton, MA
www.wilsonph.com
[email protected] - Gary I assume the
valve was not working every time. The higher resistance would tell you that but so also would an increased amp draw from the rated amp draw on the gas valve.
You also have to be careful with ohms readings on gas valves as they are doing so many things internally to valves to make them last longer and todays ohm reading may not be the same tomorrow.
I took five valves out of the box at my center today and tested all of them and they all were slightly different. - Hey Tim
I've enjoyed your input on everything you write on but I would like your input on the statement you made about an open ground circuit. You stated(as I read it) that if you read 24 volts on both sides of the valve, the ground circuit is open. For troubleshooting purposes because there is no path to the other side of the source(i.e. the transformer) the voltage may read anything between 0 and 24 volts(what I like to call funky voltage?)
Whoops read it again and it made sense.
Advertising
Part number 550-141-893/0800
10
AHE Series 4 Direct Vent Wall-Mounted Boilers — User’s Information Manual
Honeywell VR8205 and White-Rodgers 36E gas valves
FOR YOUR SAFETY READ BEFORE OPERATING
Robertshaw 7200 Gas Valve Manual
OPERATING INSTRUCTIONS
TO TURN OFF GAS TO THE APPLIANCE
•
Do not try to light any appliance.
•
Do not touch any electric switch; do not use
any phone in your building.
any phone in your building.
•
Immediately call your gas supplier from a neighbor's phone.
Follow the gas supplier's instructions.
Follow the gas supplier's instructions.
•
If you cannot reach your gas supplier, call the fire department.
WHAT TO DO IF YOU SMELL GAS
1.
Stop!
Read the safety information above on this label.
2. Set the thermostat to lowest setting.
3. How to download pubg mobile on macbook. Turn off all electrical power to the appliance.
4. Remove control access panel.
5. This appliance is equipped with an ignition device which automatically
lights the burner. Do not try to light the burner by hand.
6. Turn
gas control knob
clockwise
to
OFF
.
7. Wait five (5) minutes to clear out any gas. Then smell for gas, including
near the floor. If you smell gas,
Robertshaw 7200er Gas Valve Manual
STOP!
Follow
'B'
in the safety information
above. If you don't smell gas, go to the next step.
8. Turn
gas control knob
counterclockwise
to
ON
.
9. Turn on all electric power to the appliance.
10. Set thermostat to desired setting.
11. If the appliance will not operate, follow the instructions
'To Turn Off Gas
To Appliance'
![Gas Gas](https://images-na.ssl-images-amazon.com/images/I/91w3-9lBZCL._AC_UL160_SR146,160_.jpg)
below and call your service technician or gas supplier.
12. Replace control access panel.
1. Set the thermostat to lowest setting.
2. Turn off all electric power to the appliance if service is to be performed.
3. Remove control access panel.
4. Turn
gas control knob
clockwise
to
OFF
. Do not force.
5. Replace control access panel.
A. This appliance is equipped with an ignition
device which automatically lights the pilot.
Do
not
Robertshaw Gas Valve Model 7000
try to light the pilot by hand.
B. Before
OPERATING Game pes 2013 highly compressed 10mb.
, smell all around the
appliance area for gas. Be sure to smell next to
the floor because some gas is heavier than air
and will settle on the floor. See below.
the floor because some gas is heavier than air
and will settle on the floor. See below.
C. Use only your hand to turn the gas control knob. Never use
tools. Best macbook for fl studio. If the knob will not turn by hand, don't try to repair it,
call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
call a qualified service technician. Force or attempted repair
may result in a fire or explosion.
D. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and to replace any part of the control system and any
gas control, which has been under water.
appliance and to replace any part of the control system and any
gas control, which has been under water.
If you do not follow these instructions exactly, a fire or explosion may result
causing property damage, personal injury or loss of life.
causing property damage, personal injury or loss of life.
88731
White-Rodgers
36E Gas valve
36E Gas valve
Honeywell
VR8205
Gas valve
VR8205
Gas valve
Position indicator
(shown in 'ON' position)
Gas control knob
Gas control knob
Position indicator
(shown in 'ON' position)
Robertshaw 7200er Gas Valve Manual Instructions
Operating instructions --
Robertshaw 7200 gas valve
Advertising
Robertshaw 7200er Gas Valve Manual System
Popular Brands
Robertshaw Millivolt Gas Valve Instruction
Popular manuals