1988 PA50AF Modine garage heater barely igniting??

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Old 12-28-16, 01:27 AM
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1988 PA50AF Modine garage heater barely igniting??

So My brother in law gave to me a old Modine Garage heater this past summer, which is in superb shape considering. Now I have spent the past week scouring the Internet trying to find info on this thing. It has a SP715A module and a 71F 11A 000 Robertshaw gas valve. Don't ask how long it took just to determine that. Modine Mfg sure doesn't offer much assistance in researching their older models. Anyway, so after A LOT of searching, reading, trial and error I have this damn thing working right up to the point of the valve opening (I think?). I say that because the heat exchanger burners do let out a flame but they are very very minimal. Name:  20161219_190301.jpg
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I am curious if anyone can shed some light on this issue that had made me research through sleepless nights? I have 24v at the (P)pilot and (M)main connections on the valve. Actually it reads like 27v. However should it read a continuous 24 (27) volts? Cause it does. Also I'm not completely positive the stat is (2) wired exactly correct? I have a dial tstat with r red attached to T1 and the w white attached to T2.Name:  20161105_050044.jpg
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The whole system goes through the initial start up as (i believe) it should...even the click of the gas valve presumably opening. So I don't have a manometer to check the "wc" inches of pressure. I feel certain the supply side is more than sufficient on pressure. So that is my dilemma...any other advice besides purchasing a new gas valve? PLEASE HELP...I can't afford anymore time to spend on this...not to mention my sanity!! Name:  20161105_045845_001.jpg
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Last edited by Skip Frazer; 12-28-16 at 01:47 AM.
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Old 12-28-16, 02:44 AM
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Welcome to the forums.


Are you using the heater on the fuel it was set up for ?
 
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Old 12-28-16, 03:33 AM
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I sure am pete. NG, newly ran to my garage...sorry not sure where i got pete from?
 
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Old 12-28-16, 06:26 AM
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i see I've had several views, cmon guys someone has that magic answer. i Hasbrouck hit a wall and i need heat. this propane is killing me!!
 
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Old 12-28-16, 02:15 PM
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That's a pricey gas valve. In STOCK Modine 5H71923 Replacement Gas Valve 5H0719230000.

If the gas valve is getting its 24vac but you aren't getting a proper flame it leaves you with three options....

Defective valve
Low gas pressure or incorrectly set gas pressure on valve.
Plugged orifice.
 
  #6  
Old 12-29-16, 02:36 AM
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That is a pricey valve, thank God is not the one I'm after. My side cover actually has 5H70903C label on it but it doesn't show anything when searched. I would be replacing with the Robertshaw 720-074 (or 079) I believe. I have it written down, but I've checked and that's the one Id be installing. Or a cross reference by another manufacturer. Anyway, no plugged orfices, I checked gonna do a pressure test on it tomorrow and if that's not it I guess is new valve time. The heater was given to me so the price of the valve would be what id have in it. That and WAY TOO MUCH TIME!!
 
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Old 12-29-16, 05:52 AM
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Before any parts are replaced, the incoming and manifold gas pressure will need to be checked and verified correct.
Just to verify, you've mentioned both natural and propane gas in this thread. Which do you have and which is the heater setup for?
 
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Old 12-30-16, 08:36 AM
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This is a Natural gas only heater. I just mentioned I was sick of the propane from the torpedo heater I'm currently using.
 
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Old 12-05-17, 06:00 AM
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After you check and correct the manifold pressure, if this heater still does not flow the correct amount of gas, I would ask my brother-in law again where he got the heater and could it have been set up for propane. That would explain a very low gas flame. The cost for that gas valve is because it is an OEM and not a replacement valve.
 

Last edited by Steamboy; 12-05-17 at 06:01 AM. Reason: gas valve
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Old 12-05-17, 06:09 AM
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Steamboy, look at the date of this thread, almost a full year has passed since the last post.
 
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Old 12-05-17, 10:23 AM
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sorry; I missed the dateof the last post
 
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Old 12-05-17, 10:28 AM
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Thread closed.... ......................
 
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