Maytag range LP back to NG

jdoff · 01-27-2009, 10:20 AM

I have a Maytag MGR5755QDQ that I bought used. It had been converted to LP, and the original orifices were lost. I need to convert it back to NG.

The problem is that Maytag doesn't list part numbers or even show that the NG orifices are available separate from the assemblies that hold them (and there are six: four burners, oven, broiler), which would cost more than I paid for it. I've spoken to Maytag dealers and the factory parts service, and I'm currently waiting for a Maytag distributor to "email the manufacturer", but I'm not hopeful.

So, what should I do? I figure I can drill out the existing orifices and make the other adjustments in the conversion manual, but I'm not sure what sizes are correct. The stove has (in NG mode) two 9.2K burners and two 12K burners, which I think corresponds to 1.50 mm and 1.70 mm, but I'm not positive. And I have no idea what the oven and broiler orifices sizes are or should be.

jdoff · 01-27-2009, 05:32 PM

Okay, I think I'm getting somewhere.

First of all, the conversion manual does give me some information on the oven and broiler orifices. The LP oven orifice is marked ".049", which means that its size is 0.049 inches. The broiler orifice is marked "#57", which means that it's 0.043 inches, according to this chart:

http://www.bacharach-training.com/orifice_chart.htm

Now, that chart is even more useful because I can cross-check the burner orifices to see if I'm on the right track, as well as use it (with some assumptions) to figure out what size the oven and broiler orifices should be.

Here's what the manual for the range says about the burners, which matches the chart fairly closely, if I assume that my NG regulator is set at 4.0 inches of water:

Code:

orifice    LP BTU    LP size    NG BTU    NG size
-------    ------    -------    ------    -------
F burn.    10,500    0.038 in   12,000    0.067 in
R burn.     9,100    0.035 in    9,200    0.059 in

Using the LP/NG size ratios of the burner orifices, and the size/BTU information from that chart, here's my best guess as to the correct NG orifice sizes for the oven and broiler:

Code:

orifice    LP BTU    LP size    NG BTU    NG size
-------    ------    -------    ------    -------
oven       17,000*   0.049 in   20,000*   0.084 in*
broiler    13,000*   0.043 in   15,000*   0.074 in*

* estimated

I'd prefer to know the exact correct sizes for the oven and broiler orifices, but if I can't find that, does my method seem reasonable? Does the heat output in BTUs seem correct for the oven and broiler, or am I way off?

jdoff · 01-29-2009, 10:19 PM

Anyone know of a good appliance repair forum?

Bondo · 01-30-2009, 01:30 PM

Ayuh,...

In my experince,...
There's what I guess would be called the stove's Master Orifice,..

I know you only need to change a Single Orifice to convert a stove from LP to NG...

When I bought mine from Sears a few years ago,..
I set it up for the LP,+ taped the NG part to the back of the stove, down by where it gets Changed....

I would think any Maytag Dealer could sell you the part you Need,....

jdoff · 01-30-2009, 01:43 PM

Quote:

Originally Posted by Bondo

Ayuh,...

In my experince,...
There's what I guess would be called the stove's Master Orifice,..

I know you only need to change a Single Orifice to convert a stove from LP to NG...

When I bought mine from Sears a few years ago,..
I set it up for the LP,+ taped the NG part to the back of the stove, down by where it gets Changed....

You're probably thinking of the regulator. All that does is regulate the gas pressure differently for LP and NG (something like 11 and 4 inches of water, respectively). You still need to replace orifices for each burner, the bake orifice, and the broil orifice, as well as adjust the air shutters and possibly burner valves.

Quote:

I would think any Maytag Dealer could sell you the part you Need,....

So would I. That's not the case. See the OP.

Bondo · 01-30-2009, 01:45 PM

Quote:

You still need to replace orifices for each burner, the bake orifice, and the broil orifice, as well as adjust the air shutters and possibly burner valves.

Nope,..... You're Wrong.....

jdoff · 01-30-2009, 02:04 PM

Quote:

Originally Posted by Bondo

Nope,..... You're Wrong.....

Well, then you should do Maytag a favor and tell them all their manuals are wrong.

Quote:

Originally Posted by Maytag Installation Manual, page 7

To convert the unit to either LP or Natural gas will require adjustment of the air shutter on the bake & broil burner, adjustment of the pressure regulator converter cap, and replacement of the bake and broil burner orifice hoods and top burner orifices.

Here's a link if you don't believe me: Installation Manual for Gas 30-inch Wide Free-Standing Range

Bondo · 01-30-2009, 03:09 PM

I Apoligize,... I stand Corrected...

In the 35+ years of messing with the occasional gas ranges,...
I've Never seen 1 so Involved, just to convert gases...

01-27-2009, 10:20 AM	#1
jdoff Newbie Join Date: Jun 2008 Posts: 5	Maytag range LP back to NG I have a Maytag MGR5755QDQ that I bought used. It had been converted to LP, and the original orifices were lost. I need to convert it back to NG. The problem is that Maytag doesn't list part numbers or even show that the NG orifices are available separate from the assemblies that hold them (and there are six: four burners, oven, broiler), which would cost more than I paid for it. I've spoken to Maytag dealers and the factory parts service, and I'm currently waiting for a Maytag distributor to "email the manufacturer", but I'm not hopeful. So, what should I do? I figure I can drill out the existing orifices and make the other adjustments in the conversion manual, but I'm not sure what sizes are correct. The stove has (in NG mode) two 9.2K burners and two 12K burners, which I think corresponds to 1.50 mm and 1.70 mm, but I'm not positive. And I have no idea what the oven and broiler orifices sizes are or should be.

01-27-2009, 05:32 PM	#2
jdoff Newbie Join Date: Jun 2008 Posts: 5	Maytag range LP back to NG Okay, I think I'm getting somewhere. First of all, the conversion manual does give me some information on the oven and broiler orifices. The LP oven orifice is marked ".049", which means that its size is 0.049 inches. The broiler orifice is marked "#57", which means that it's 0.043 inches, according to this chart: http://www.bacharach-training.com/orifice_chart.htm Now, that chart is even more useful because I can cross-check the burner orifices to see if I'm on the right track, as well as use it (with some assumptions) to figure out what size the oven and broiler orifices should be. Here's what the manual for the range says about the burners, which matches the chart fairly closely, if I assume that my NG regulator is set at 4.0 inches of water: Code: orifice LP BTU LP size NG BTU NG size ------- ------ ------- ------ ------- F burn. 10,500 0.038 in 12,000 0.067 in R burn. 9,100 0.035 in 9,200 0.059 in Using the LP/NG size ratios of the burner orifices, and the size/BTU information from that chart, here's my best guess as to the correct NG orifice sizes for the oven and broiler: Code: orifice LP BTU LP size NG BTU NG size ------- ------ ------- ------ ------- oven 17,000* 0.049 in 20,000* 0.084 in* broiler 13,000* 0.043 in 15,000* 0.074 in* * estimated I'd prefer to know the exact correct sizes for the oven and broiler orifices, but if I can't find that, does my method seem reasonable? Does the heat output in BTUs seem correct for the oven and broiler, or am I way off?

01-29-2009, 10:19 PM	#3
jdoff Newbie Join Date: Jun 2008 Posts: 5	Maytag range LP back to NG Anyone know of a good appliance repair forum?

01-30-2009, 01:30 PM	#4
Bondo Master General ReEngineer Join Date: Dec 2007 Location: Chaumont River, Ny. Posts: 3,175	Maytag range LP back to NG Ayuh,... In my experince,... There's what I guess would be called the stove's Master Orifice,.. I know you only need to change a Single Orifice to convert a stove from LP to NG... When I bought mine from Sears a few years ago,.. I set it up for the LP,+ taped the NG part to the back of the stove, down by where it gets Changed.... I would think any Maytag Dealer could sell you the part you Need,....

01-30-2009, 03:09 PM	#8
Bondo Master General ReEngineer Join Date: Dec 2007 Location: Chaumont River, Ny. Posts: 3,175	Maytag range LP back to NG I Apoligize,... I stand Corrected... In the 35+ years of messing with the occasional gas ranges,... I've Never seen 1 so Involved, just to convert gases...

Maytag range LP back to NG