Johnson A419abc-2c Temp Controller Replacement

[Jerome P]

My Johnson A419abc-2c Temp Controller on my Portage&Main owb is no longer working correctly, it's been in use for 10 years now. Apparently this model is longer available. Is there a replacement available for the A419abc-2c? I see the model A421abc-02 is available, would this be the replacement for the older version?

Currently my boiler is shut down until i get a new temp controller.

 

[sloeffle]

P&M is business, have you called them ?

 

[Jerome P]

P&M is business, have you called them ?

I don't like calling businesses, they have too many AI phone prompts to go through, so I thought it would be easier & faster asking here.

 

[hedge wood]

I don't like calling businesses, they have too many AI phone prompts to go through, so I thought it would be easier & faster asking here.

I have called there a couple times this fall and a real person answered the phone both times I called and who I asked for called me back the same day. Seems to be a good outfit. I am still boiler shopping.

 

[brenndatomu]

You can buy those controllers new on ebay pretty cheap...or at least the last I looked you could

 

[PassionForFire&Water]

Use model A421
Much easier to setup
24VAC, 110VAC and 240VAC models available @ www.supplyhouse.com

 

[Jerome P]

I have installed the A421abc-02 temp controller couple days ago, the controller works but won't engage my draft blower, I'm stumped, can anyone help me?

In the 40's today, going to get into the 20'sF tonight and my boiler is down.

 

[brenndatomu]

Well right off the bat the incoming power I'd think should be black on LN and white on 120V...but that may or may not matter, many of the newer electronics can run on ac, dc, and just about any polarity or voltage...dunno if this is that way or not.
Now on the load side you have both wires on the controlled side of the relay...one of them needs to be on LC, and one on LNO (I'd guess) but could be LNC, depends on how things are set up, but my guess is LNO. (That way the controller will run the blower when called on...unless you have it set for "cooling" then that reverses the relay and it would work, but you wanna set it up right...too confusing later on down the line otherwise)
How is the old one labeled, can't see it in the pic?

 

[brenndatomu]

What model PM is this? I was trying to look at the wiring on that too...but what I found has different wire colors than yours

 

[PassionForFire&Water]

Red and brown are in wrong location

OUTPUT "LC" is your common.
You need to have wire there

Then it depends what you want to do
NC is normal closed
NO is normal open

I assume you want your blower to kick in at a set temperature.
Connect to NO, so when temp reaches your setpoint it will close this contact

 

[PassionForFire&Water]

Neutral and Hot are correct if you have 240V incoming
If you have 120V incoming you need to put the black wire in the middle AC INPUT 120

 

[Jerome P]

What model PM is this? I was trying to look at the wiring on that too...but what I found has different wire colors than yours

BL2840
Year 2014

 

[Jerome P]

Red and brown are in wrong location

OUTPUT "LC" is your common.
You need to have wire there

Then it depends what you want to do
NC is normal closed
NO is normal open

I assume you want your blower to kick in at a set temperature.
Connect to NO, so when temp reaches your setpoint it will close this contact

On my old A419, orange wire was connected to C and brown wire ( I assume is for the draft blower) connected to NO. It's been set up this way last 10 years.

For the new A421, orange wire to LNO, Brown to LNC.

 

[PassionForFire&Water]

Correct, C stands for common on A419 (LC on A421)
You need Orange to LC (Common)
You need Brown to NO (Normal Open)

 

[Jerome P]

Correct, C stands for common on A419 (LC on A421)
You need Orange to LC (Common)
You need Brown to NO (Normal Open)

I moved the 2 wires over to the left and still nothing. The relay clicks and that's it.

 

[Jerome P]

Set point (on) temp is set at 170f
Set Point (off) se at 175f

 

[brenndatomu]

Did you move the incoming power to 120V?

Set point (on) temp is set at 170f
Set Point (off) se at 175f

Is it set for heat, or cool mode? Its been a while since I set one of these up, but seems to me you have to turn one or the other on...could be wrong...

 

[brenndatomu]

I moved the 2 wires over to the left and still nothing. The relay clicks and that's it.

Does the orange wire have power?
Does the brown wire have power when the relay clicks?

 

[Jerome P]

Did you move the incoming power to 120V?


Is it set for heat, or cool mode? Its been a while since I set one of these up, but seems to me you have to turn one or the other on...could be wrong...

Supply is connected to 120v
There is a flame icon next to the temp readout, I'm assuming it's set for heat.

 

[brenndatomu]

Grab a VOM and see where you have power, or not...

 

[Jerome P]

Does the orange wire have power?
Does the brown wire have power when the relay clicks?

There's power going in on the input side, on the output side there is no power in the brown (draft blower) and no power in the orange wire.

 

[Jerome P]

There's power going in on the input side, on the output side there is no power in the brown (draft blower) and no power in the orange wire.

I'm not sure if this the A421abc-02 or the A421abc-03. This wiring is completely different from my setup. I have the A421abc-02.

 

[brenndatomu]

There's power going in on the input side, on the output side there is no power in the brown (draft blower) and no power in the orange wire.

Looks like you should have power on the orange wire, which connects to the black in the junction box...is there power in there?

 

[Jerome P]

Looks like you should have power on the orange wire, which connects to the black in the junction box...is there power in there?

I took a gamble and switched the orange wire, which I assume is the load wire, from the LC terminal moved to LNO and the brown wire controlled device (blower) moved to LC. Now the draft blower works. Go figure.

Not sure why there is a wire diagram showing a black jumper wire from terminal block 1 going to terminal block 2, this would have been why next option if the above option didn't work.
Appreciate your help.

 

[brenndatomu]

I took a gamble and switched the orange wire, which I assume is the load wire, from the LC terminal moved to LNO and the brown wire controlled device (blower) moved to LC. Now the draft blower works. Go figure.

That's weird...it shouldn't really matter which one is on which terminal (as long as it's those 2) because the LC connects to LNO at setpoint, there is no polarity there for that...connected is connected.
I wonder if there is a poor or intermittent connection issue there somewhere? If you have any trouble again, that's what I'd go looking for...glad it's working now though!