Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler


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Old 03-07-10, 04:04 PM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler

Hello to all those wiser than myself,

I'm attempting to install a Tradeline (Honeywell) L6006C strap-on Aquastat on a Lennox CBWMV (Heat only) Hydronic Air Handler. The Lennox unit is being fed by a Wall Hung Quietside DPW-120A Dual Purpose Tankless Water Heater. The purpose of the Aquastat will be to prevent the Air Handler Blower Motor from coming on in the event the water temperature in the Heating Coil drops below 160. This happens from time to time due to the fact that the Quietside unit also provides Domestic Hot Water to the home, and possesses DHW priority. Therefore, when domestic hot water is in use, no hot water is provided to the closed loop heating side of the system. So if you are running hot water and the Thermostat calls for heat at the same time, you get that dreaded cold air blast! According to the manufacturer wiring an Aquatat to the Air Handler Blower will prevent this.

I have installed the L6006C Aquastat on the CBWMV's Heating Coil. My question is: What is the correct method of wiring the Aquastat to the Lennox CBWMV unit. I have provided links to photos and schematics for the Lennox CBWMV Air Handler unit and the Tradeline L6006C Aquastat.

Lennox CBWMV Wiring Diagram:
http://farm5.static.flickr.com/4064/...acd1ea9b_b.jpg

Lennox CBWMV Control Box Photo 1:
http://farm5.static.flickr.com/4021/...71ea2cb9_b.jpg

Lennox CBWMV Control Box Photo 2:
http://farm3.static.flickr.com/2749/...26b797a2_b.jpg

Lennox CBWMV Control Box Photo 3:
http://farm5.static.flickr.com/4053/...9232a341_b.jpg

Lennox CBWMV Control Box Photo 4:
http://farm5.static.flickr.com/4043/...01ca05c0_b.jpg

Lennox CBWMV Control Box Photo 5:
http://farm5.static.flickr.com/4069/...b88f9152_b.jpg

Lennox CBWMV Control Box Photo 6:
http://farm3.static.flickr.com/2747/...3e2cc4b5_b.jpg

Honeywell L6006C Aquastat Specs:
http://customer.honeywell.com/techli...0s/60-2104.pdf
 
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Old 03-08-10, 05:08 PM
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I've looked at the pics and the schematic, and must confess that I can't really make heads r' tails out of it...

Generically speaking, the aquastat would have to switch the hot 120 V supply to the blower motor, but I don't know the function of all them wires going to it... I don't know if you can simply insert the aquastat in the hot wire to the blower... I would think not, because isn't this used for A/C also? If so, then switching the hot to the blower is going to cause 'no blower' when the A/C kicks in...

Have you tried contacting Lennox?
 
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Old 03-10-10, 04:22 PM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler

This is a Heat only system but I would like to retain the "Fan Ony" mode. The Manufacturer recommends setting up the system with an Aquastat on the Heating Coil. The Aquastat would only be used to prevent the blower fan from coming on if the water temperature is to low in the coil during "Heat" mode. It would not be controlling any other aspect of the Air Handler. Problem is, I don't know the correct wiring connections for this CBWMV unit and the manufacturer does not specify.
 
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Old 03-10-10, 05:05 PM
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Wiring

If the "fan only" speed is different from the "heat" fan speed, all you have to do is break the "heat" fan speed wire via the aquastat.
 
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Old 03-10-10, 07:05 PM
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True... IF we could figure out which wire that was by looking at that lame schematic with no labels on the pinouts of the connectors... that's the problem... if we knew which pin was what, on the blower controller, we could figure it out...

I still think you should call Lennox.
Don't tell them you are a homeowner trying to DIY, tell them you are a contractor on a job... you'll have a better chance of getting help.
 
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Old 03-11-10, 05:36 PM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler

Hi guys! Thanks for all your input on this matter. I think I'm finally getting some insight to this problem. Here's what I'm thinking. If you look at the photo below and the wiring diagram, there are yellow, green, pink and purple wires running from the 15 pin motor connector on the motor speed control board (A52) to the thermostat connection terminal (TB1). Yellow goes to (C) terminal, Green goes to (G), Pink goes to (W1) and Purple goes to (R). My thoughts are to splice the Pink (W1) wire between terminals (A52) and (TB1) and tie in the Aquastat at this point. I believe that this will keep motor from running when (W1) Heat circuit is energized while water temp is below Aquastat set temp. I also believe that the "Fan Only" circuit (G) should be unaffected if I tie-in at this point.

Or am I just Dumber than I think I am?

 
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Old 03-11-10, 06:55 PM
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OK, lemmee do this quick, don't know how long my net connection is going to last this time...

I guess the reason that I didn't understand is because I didn't know that W1 was the heating call for the fan, and the G was for fan only...

do you have something that tells you that's what they are? In other words, you are sure of the function?

If that's the case, then I believe your plan will work.

I would use those terminal strips for field wiring that they were nice enough to include in the box for you!

How does the boiler know there's a heat call? I can't see that on this schematic...
 
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Old 03-12-10, 11:11 AM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler

According to the manual that came with my Honeywell Prestige Thermostat, when set up for "heat only with fan" the (C) wire is 24VAC common, (R) wire is power, (W) wire is Heat Relay and (G) wire is Fan Relay... and the wiring all seems to correlate. As far as the Boiler goes, the tech has it wired to a field installed 24 volt relay which is wired to the (C) Common and (W1) Heat terminals on the thermostat connection terminal (TB1). Funny thing is there's a factory installed 24 volt relay on the Lennox pannel that's not in use. I guess old habits never die!

When you say that you would use the terminal strips, would I use two terminals and wire each half of the Pink wire to one leg of the terminals and then wire the Aquastat to the other leg of the terminals.

 
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Old 03-12-10, 02:09 PM
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Thermostat connections

You don't want to break the low voltage. To do so would likely cause a "no heat" situation. You want to break the line voltage wire used for the heating speed on the fan motor. This will keep the fan off until the contacts on the aquastat close.
 
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Old 03-12-10, 02:24 PM
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Grady, I'm not so sure about that...

From what I can see, the pink wire to the controller turns the fan on with a heat call... and from the description, the boiler relay is 'ahead' of that in the circuit... I think what the plan is will allow the boiler to fire, and the fan to be held off until the aquastat on the coil satisfies... the aquastat will be in series with the fan signal, but not with the boiler signal... I think...

If we all agree that this is the way to do it, I would put one end of each of the cut pink wires to the first position on each of the field wiring terminal strips, and wire the aquastat between them.

I can't imagine why the tech would not have used that big ole free relay to fire the boiler!
 
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Old 03-12-10, 03:03 PM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Handler

NJ Trooper, I agree with you. I now believe that this is the way to do it.

I'm also puzzled as to why the tech didn't use that relay? I guess just some old habits are hard to break.
 
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Old 03-15-10, 04:28 PM
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Wiring Tradeline L6006C Aquastat to Lennox CBWMV Hydronic Air Module

Thanks for everyone's input. After days of studying wiring diagrams and online posts, I am now confident that this is the correct way to wire the Aquastat for my application (please see wiring diagram below). If anyone feels otherwise, please, your input would be much appreciated.
 
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Old 12-06-11, 06:29 AM
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Lightbulb Hi, Very Interesting search.

I want to do same thing wiith my AHU which is RUUD model UHLA 6024AA. Can you please guide me, which aqua-stat to buy and where to connect. Thanks for posting and making it simple for "do it severs".
Thanks. God bless us all.
 
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Old 12-06-11, 02:45 PM
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Singh, does your unit not have an aquastat already? and it blows cold air at times? Is that why you are asking for this?

I see that you have also asked this question in another thread today. I think you should get good answers there.

http://www.doityourself.com/forum/th...la-6024aa.html
 
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Old 12-10-11, 03:33 PM
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It was piece of cake. Done. Thanks for the help.
 
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Old 12-10-11, 05:42 PM
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Good going... Namaste!.................
 
 

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