Question about Dayton (3E379) Heater

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Dayton Fuel Trimmer Shop Heater

I inherited this heater when I moved into the shop. Previous owner installed the flue pipe INSIDE the rear flange. Is this correct, or should it be installed on the outside so it butts up agains heater housing? Also, what is the flue flange diameter. I have no manuals ore model information, so a range of ansers may be useful. Thanks.
Dennis Roberts
[email protected]

Posted by Hndbells on

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Flue diameter is 4 inch
Propane Unit Heater, BtuH Input 30000, Full Load Current 2.1 Amps, Gas Inlet 1/2 Inch, Flue Diameter 4 R,V, Motor Power Rating 1/30 HP, Free Air Flow 700 CFM, Height 27 1/2 Inches, Depth 27 5/8 Inches, Width 14 Inches, OC Mounting 8 5/8 Inches, 115 Volts, Energy Saving

Posted on Nov 21, 2007

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The top red light flashes and then after a while it turns off and both lights flash red with temp 14 flashing also


Hi Karen,

If my description of what your heater is doing please read through to the end.

The heater is turned on and a room temperature is selected.
You can hear the noise of a small fan start, which shortly after the heater starts.
After a short period of time the heater stops and the red led begins to flash and shuts itself down.

This type of heater has a balanced flue, which means it draws air in one pipe and exhausts it out another.
Have the balanced flue checked for blockages, the problem will most likely be in the flue pipe which draws the outside cool air into the heater and not the flue pipe which blows out the hot air.
it may be full of cob webs or something else which restricts the air flow to the heater.
A service person can perform a quick test to prove the above theory. At the rear of the heater there are two pipes, one is an insulated metal pipe and the other is plastic pipe.
Disconnect the plastic pipe from the flue box and restart the heater.
If the heater runs normally this will confirm that there is a blockage.

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1 Answer

Rinnai energysaver 556 blinking


Hi jmsocr2315,

If my description of what your heater is doing please read through to the end.

The heater is turned on and a room temperature is selected.
You can hear the noise of a small fan start, which shortly after the heater starts.
After a short period of time the heater stops and the red led begins to flash and shuts itself down.

This type of heater has a balanced flue, which means it draws air in one pipe and exhausts it out another.
Have the balanced flue checked for blockages, the problem will most likely be in the flue pipe which draws the outside cool air into the heater and not the flue pipe which blows out the hot air.
it may be full of cob webs or something else which restricts the air flow to the heater.
A service person can perform a quick test to prove the above theory. At the rear of the heater there are two pipes, one is an insulated metal pipe and the other is plastic pipe.
Disconnect the plastic pipe from the flue box and restart the heater.
If the heater runs normally this will confirm that there is a blockage.

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1 Answer

Type of Flue pipe for Nordyne Intertherm mobile home gas furnace


The flue is just 1 pipe inside another, no insulation. But has lil support brackets holding the inner pipe in its place, centered to the outer pipe. I googled Nordyne Flue Pipe, and it is available online. And HELLO from the heart of Texas! Hope this helps!

Mar 12, 2017 | Heating & Cooling

1 Answer

Light where flashing and heat was off


Hi cobbsski,

If my description of what your heater is doing please read through to the end.

The heater is turned on and a room temperature is selected.
You can hear the noise of a small fan start, which shortly after the heater starts.
After a short period of time the heater stops and the red led begins to flash and shuts itself down.

This type of heater has a balanced flue, which means it draws air in one pipe and exhausts it out another.
Have the balanced flue checked for blockages, the problem will most likely be in the flue pipe which draws the outside cool air into the heater and not the flue pipe which blows out the hot air.
it may be full of cob webs or something else which restricts the air flow to the heater.
A service person can perform a quick test to prove the above theory. At the rear of the heater there are two pipes, one is an insulated metal pipe and the other is plastic pipe.
Disconnect the plastic pipe from the flue box and restart the heater.
If the heater runs normally this will confirm that there is a blockage.

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1 Answer

Cold air leaks in around the unit while it is not running. How can I insulate the air intake so that this does not happen?


Is this unit tight against the wall?
Can it be pulled away from the wall, without too much difficulty?
You need to be sure the leak is outside of the flue pipe going thru the wall to the outside.--
Or is it leaking in thru the inside?

If the leakage is due to a gap between the flue pipe and the hole thru the wall, then attention needs to be given to the flashing, and the air tight seal at the outside of the penetration...
Was a metal collar installed-- TIGHTLY against the flue pipe?
How was the needed air space (for fire prevention) made between the HOT flue pipe, and the framing materials?-- Then outside of that, how was the gap insulated?- (Non burnable-- like fiberglass can be used-- but it all depends upon the outer and then inner METAL seal rings being tight.)

Tell us more about where you are feeling the drafts..

Mack B

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My reliance sta-kleen 502 is leaking. The water is dripping on top of the pilot light, extinguishing the flame . Please advise me with step by step instructions to diagnose and attempt fix this myself....


If you have a leaking water heater there is a serious problem.
http://waterheatertimer.org/Water-heater-leaking.html
Page shows how to limp along on a leaking water heater if your water heater needs replacement.

One of three things is causing the water:
1) Loose water connection on top of tank that is dripping down inside tank >> check pipes on top of tank.

2) The vent is clogged or not working correctly causing condensation inside flue pipe.
Condensation water is dripping back down inside tank.
Problem means possible CO poisoning if gas is not venting.
Look at vent pipe to see if joints are corroded.
Use long fireplace match > light match and put into draft hood at top of tank and see if smoke goes up.
Put hand at draft hood opening when water heater turns on to see if vent gas enters home.
Do same test when furnace turns on to see if furnace vent is pushing back into water heater.
Does water heater vent inside same pipe as furnace? You may need to set up separate vent for water heater if furnace gasses are pushing back into home.
Check furnace vent for obstructions.
Look at vent stack top of home to see if hood is in place.
Check if bird nest is built inside warm vent pipe.
Improper flue is top priority for getting fixed so vent gasses properly escape home.
You may have to call a plumber.
Professional plumbing forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

3) Your water heater is rusted out.
A rusted tank has to be replaced.
It cannot be repaired.
However, before replacing tank, you do not want a tank failure where tank ruptures and water runs inside home until water is shut off.
This will cause major damage.
Protect yourself first.
Turn off water valve above tank.
Move gas knob to 'pilot' so burner is not heating water.
Open tub spout on hot side to relieve pressure on tank so it will not rupture.

Now you're protected.
Link above shows how to limp along on failed tank until you can replace heater.

You need a new gas water heater from Lowes or Home Depot
Look at label on side of you tank for gallons and btu's of your water heater.
Measure height to flue pipe so you get same height water heater, so pipes don't have to be changed.
You need a pipe wrench and teflon tape which will be wrapped on each pipe thread when pipes are reassembled.

Step1) Drain water heater using valve at bottom of tank.
http://waterheatertimer.org/Water-heater-will-not-drain.html

2) Turn off gas valve going into heater.
When gas valve is perpendicular to gas line, then gas is off.
Dissemble gas line to water heater.

3) Disconnect flue pipe and support flue pipe with wire so it doesn't not fall down. Flue pipe joints should be held together at each joint with 3 screws.

4) Turn off water. Shut off valve is on COLD side.
Disconnect water pipes.

5) Move old water heater out of way.

6) Set new water heater in place. Put water heater in drip pan.

7) Connect water pipes >> cold goes to side marked cold.
Hot to hot.
Buy new flexible water connector pipes at home center for easy installation of water pipes.

8) Connect gas line exactly as it was connected before.
Home center sells flexible gas line connector for easy installation of gas line.
To test for gas leak after installation, mix liquid soap with water and put around gas line joints to see if there are bubbles.
Natural gas has less pressure than water lines, so gas pipes are easy to seal with ordinary wrench.

9) install TP pipe that runs to floor. Use old one off old heater.

10) Fill tank completely with water until water is coming out of tub spout.

11) Turn on gas, and light pilot as shown in manual.
New gas heater sometimes have small water leak when first fired up, so ignore a bit of water.

12) Save water heater manual like it is gold, and read everything in manual.

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1 Answer

The heater keeps shutting off , getting a 99 code


Terry,

Remove the flex hose from the flue pipe inside the house. Try to start the stove. If it runs there is a problem with the flue. If it's been very cold look closely at the pipe around the exhaust pipe. That is the air side. There could be frost built up inside the air pipe. If so it will shut off the gas and you can't run the stove.

Tom Hawkins
[email protected]

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1 Answer

Need to move the unit by dismantling


Remove the two screws on the side trim. Remove the two top screws from the filter panel. Reach behind the heater and pull the sock down on the vent pipe. unclip the two clamps holding the vent pipe together. Remove the plastic elbow off of the vent termination. Slide the heater to the left to slide the vent pipe off of the vent termination. Remove the gas line after shutting the gas off.

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Moved Laser 73 to differant building, need template for flue pipe


the cardboard is 28" wide and 21.5" high . Mark 8 1/8" up from bottom and 11 1/2" from the right side. This is the pivot point of the 2 holes on the card board template. from this pivot point you measure out 4 1/2 " anywhere from 12 o'clock to 3 o' clock position is where the center of your hole will start. MIne is in for 6 years and the pipes are really stuck together. I left it in for fear of hurting the vent pipe. that is the pipe in a pipe through the wall,may leak if the elbow from the heater is forced out. They say using liqued wrench helps if you give it 1/2 hour I decided to let it in. dave

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1 Answer

Replacing a Rinnai 403 FT


gday nelson. if you check out the specs on the rinnai range you will find another one that will go straight in. if you buy new it will come with a new flue kit. as far as recomended installation heights most of them are quite flexible. i installed a second hand 403ft yesterday with the centre of the flue at 140mm from the floor. recomended in the instructions were 240mm. a mate gave me the heater and i just had to buy a flue kit as the old one was already too short. if you messure your flue from inside and send me the specs i can give you a more difinitive answer.

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