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HAI RC-80 madness
Posted 24 October 2006 - 10:31 AM
It's 61 degrees in the house (both thermostats report this correctly). I decided to turn the heat on, and set the desired temperature to 65. Few minutes later, I hear the heater turn off, so I go check it out, and noticed how the HAI thermostat reports 68 degrees, and my old thermostat reports 63.
This has been happening since the beginning, and I am about to yank this thermostat out and put the old one back in. If it really was 68 in here, why would it be running, even if the temp is set to 65? After a few minutes, I can see the temp drop rapidly, so obviously something is screwy.
Posted 24 October 2006 - 04:33 PM
Posted 24 October 2006 - 05:22 PM
Posted 24 October 2006 - 06:50 PM
Posted 24 October 2006 - 07:17 PM
Posted 25 October 2006 - 10:51 AM
Posted 25 October 2006 - 11:03 AM
I know the setup was tricky and I had someone help me get mine in. It involved using some relay that was already near the burner. I'm not sure why this would change the temperature though.
Is it possible there is something wrong with the unit?
There is another document that comes with the thermostat (maybe it is on smarthome.com or hai's site), I vaguely remember some jumpers, maybe confirm those are in the right position.
The other item (although I don't understand why this would have a different result): If you are hooking this to the elk, do you see the same symptoms (I would expect you would).
Not much here, but hope this helps.
Posted 25 October 2006 - 05:37 PM
O.K. Lets go back to square one. Basically, if you are only talking about heat. you use two wires, red and white. Connect them together and you should have heat. Separate them, no heat. Your fan should control itself in most instances, but connecting the green to red turns on the fan.
If you have a meter, you should measure 24VAC between red and white when the thermostat is NOT calling for heat, and a few volts when it is. So, is this working? What type of furnace do you have? Gas or Oil, I hope, because others usually need a different type of thermostat or a isolation module.
If you see the temp reading changing on the thermostat for no reason, then it sounds like it could be bad. Does it always read incorrect, or is it sometimes correct?
HAI makes two additions for special situations. The Thermostat Isolation Module (HAI Part Number 29A00-1) provides relay isolation if you have non-standard voltages. Sounds like you might be using this.
They also have a Thermostat Power Supply Module (HAI Part Number 30A00-1) which provides a power booster for thermostats if you don't use a common. Its best to just use a common instead if you can.
So, you should be able to get it to work, but you got to understand how its wired and how it works.
I think the jumper you are talking about controls the backlight. Removing it will shut off the backlight, but may also fix your problem.
P.S. The thermostats should work like this. Lets say you set them to HEAT and 75 degrees. When the temp drops to 74, they should call for heat, and the asterisk should turn on. When the temp just hits 76, it should shut off. So the thermostat should never be more than one degree above or below the temp you set.
Edited by ano, 25 October 2006 - 05:45 PM.
Posted 28 January 2007 - 10:06 AM
I also don't have a common wire (I think, unless one of the 4 wires mentioned is the common wire), so can't hook that one up.
Posted 28 January 2007 - 11:01 AM
I don't see it in the thread anywhere, but do you have cooling hooked up in addition to heat? It appears that the HAI is entirely powered by the HVAC system (unlike my RCS). Since you're not using a common line, your only power is coming through the relays in the system, and is being stolen across the switches in your thermostat. If only red and white are connected, then you have no effective power to the thermostat when it switches heat on - literally 0 volts if the hai uses a relay, and only 1-2V if it's a triac.
If you have cool hooked up as well, then you should still read a usable voltage across red/green or red/yellow while the heat side is active. If this is the case (and right now I suspect it's not), then delivered power is probably not the issue.
In which case I'm not sure what the problem is...
If you don't have decent power while the system is on then you are going to have to find a way to get a common line from the unit down to the thermostat. It might also be possible to supply an alternative power source, but I don't know enough about the HAI to make a safe suggestion.
Posted 28 January 2007 - 11:07 AM
Here are some pictures:
I do have cool hooked up, but it doesn't work at all. I'll have to figure out if I can remove that terminal strip again, since otherwise I can't measure the voltage while the thermostat is connected.
Posted 28 January 2007 - 11:37 AM
Does the fan-only setting work? What do you have system options set to?
More questions, few answers...
Posted 28 January 2007 - 11:56 AM
25.9V with backlight and fan on
I just got it to work with the meter attached, and it dropped to 0.00V when the heat came on. Once I turned the heat off, it went back up to 26V without moving the probes around.
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