Lennox iComfort hookup for Crown Boiler

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Old 10-19-17, 05:09 PM
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Lennox iComfort hookup for Crown Boiler

Hi All,

We are in the middle of a late season hvac install. The installer claims that the Lennox iComfort tstat (part # 103445-04) will not be able to call the existing Aruba Crown boiler for heat.
He wants to leave the old Honeywell tstat in place for heat, and use the iComfort only for the cooling.

Can someone please confirm if there is any relay or other options we can use to connect the boiler to the iComfort?
It doesn't make sense to leave two tstats on the wall together - and they look ugly like that too

TIA!
 
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Old 10-19-17, 05:25 PM
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I'm not a Lennox dealer and that is a sophisticated setup.

That is a communicating thermostat. If it's used with a communicating air handler and condensor then it appears it will only support a duel fuel setup when connected to a heat pump system. It makes the most sense to use that stat in the communicating mode as that's what it is designed for.

I would have to say it cannot run a separate heating unit. My forum partner will be by and he may know better.

lennox/owners/wifi/Lennox_icomfortWiFi_Installation_Manual.pdf
 
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Old 10-19-17, 07:33 PM
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Thanks for the quick feedback.
We do not have any furnace, just the Crown boiler with four heat zones + one indirect.
We hope to keep just the iComfort as tstat in one zone, and somehow tie the boiler into the setup for that zone.
Had vaguely heard about some way this could be done, maybe via an additional interface or a relay as an add-on into the communicating system.
Will greatly appreciate feedback and advise.
 
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Old 10-21-17, 01:40 AM
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I don't see a hydronic kit associated with that icomfort thermostat.

What is the model number of the air handler?
 
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Old 10-21-17, 09:11 AM
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The air handler is CBX40UHV.
"CBX40UHV-036-230-6-04"
tnx
 
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Old 10-22-17, 07:32 PM
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Has anyone found the following to work as a solution for two-wire hydronic connections with iComfort and similar wifi tstats?
Lennox option:
https://m.lennoxpros.com/nr-common-m...t-stat/p/Y7744

Found on the web:
Two-wire hookups for new wi-fi tstats - https://www.fast-stat.net/

tnx
 
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Old 10-22-17, 11:17 PM
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The issue here is that we need to go from a communicating signal to an analog signal.
With Carrier communicating air handlers I have purchased a hydronic kit to accomplish this requirement.

Lennox actually makes a Hydronic air handler. The evaporator coil is usually next to this air handler using a duct transition.
This may be the reason that I have not found a kit for that air handler.
https://resources.lennox.com//FileUp...=auto,-265,745

I suspect that you do not have a ducted hot water coil. If this is the case you will still have an issue with the blower running with heat should you find a hydronic kit.
 
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Old 10-24-17, 05:28 PM
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Thanks. No we do not have a ducted hot water coil, just regular baseboard heat zones.
So you're saying that the blower will kick in every time the boiler calls for heat? Thats no good.
We can't be the only home that has run into this situation! And Lennox has nothing in its design to address it?
 
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Old 10-29-17, 04:46 PM
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Ok, found a post online that mentions the following:

https://smile.amazon.com/LockState-C...f_=ya_aw_od_pi
“LockState Connect LS-24VAC 24 Vac Adaptor for LS-90i”.

People are using it with Nest, Honeywell RTH9580WF Smart Wi-Fi 7 Day Programmable Color Touch Thermostat and other newer wi-fi based tstas.

Anyone know if this 24v adapter can be an option for the Lennox thermostat as well?
Tnx
 
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Old 10-29-17, 05:02 PM
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No.... that power supply is used to run a thermostat. That is not your issue.

Your issue is specifically...... attaching/operating a fossil fuel heating system to your Lennox communicating system. Your thermostat tells the EIM (electronic control module) what to do. You need to connect your heating system to that EIM.
 
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Old 10-31-17, 05:19 PM
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Thank you PJmax

If we had known that the iComfort /EIM design deprecates old two-wire hydronic connectivity, we’d have gone with another brand.
Now we have two tsats running next to each other and have to live with it.

Hopefully this thread helps others to decide in the future.
 
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