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12-25-2012, 09:30 PM
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#1
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Newbie
Join Date: Dec 2012
Posts: 1
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Aprilaire 700 incorrectly wired to the furnace
Recently had a Aprilaire 700 humidifier installed by service technician that burned out after less than 1 year. New service technician informed me that the unit burned out because of being incorrectly wired. was told that the 24 volts from the humidifiers should not have been wired to 24 volts to the furnace. And should have only been wired to the humidistat As I have no background experience here I am Not sure if this was the case or not please comment
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12-25-2012, 10:28 PM
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#2
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Member
Join Date: Nov 2012
Location: Will county, Illinois
Posts: 109
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Aprilaire 700 incorrectly wired to the furnace
The 110V side of the 24V transformer gets wired to the Neutral and the HUM connection on the furnace. One side of the 24V transformer goes to the humidistat, the return from the humidistat and the other side of the 24V transformer connect to the 2 wires on the humidifier. It does not connect to the 24V from the furnace at all.
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12-26-2012, 11:12 PM
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#3
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Member
Join Date: Aug 2012
Location: Canada ontario
Posts: 117
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Aprilaire 700 incorrectly wired to the furnace
unless your furnace has a pc board with hum. terminals for a humidifer ,.....if not then it should be wired to a separate transfer circut
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12-27-2012, 12:10 AM
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#4
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Member
Join Date: May 2010
Location: winnipeg manitoba canada
Posts: 688
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Aprilaire 700 incorrectly wired to the furnace
seen hundreds wired to w - c ... they work not saying its right way to do it... 
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12-27-2012, 12:16 AM
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#5
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Member
Join Date: Aug 2012
Location: Canada ontario
Posts: 117
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Aprilaire 700 incorrectly wired to the furnace
yur so right camron me to i just reread the post ,,, sounds like it has two 24v supplies and were bucking each other
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12-27-2012, 07:57 AM
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#6
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Member
Join Date: Oct 2011
Location: pa
Posts: 3,185
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Aprilaire 700 incorrectly wired to the furnace
yep carmon,hvac dude..see this all the time even when pc board has terminials they wire it through w-c not good to do lazyness.....but they are working..when we see this we change them add a transformer wire it through board... the right way...ben sr
Last edited by ben's plumbing; 12-27-2012 at 08:00 AM.
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12-27-2012, 10:37 AM
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#7
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Member
Join Date: Dec 2008
Posts: 282
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by carmon
seen hundreds wired to w - c ... they work not saying its right way to do it... |
Just out of curiousity, why is it bad to do this? I've read of people using this method but have never come across one. They're just using that terminal to run a 24 solenoid, correct?
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12-27-2012, 10:45 AM
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#8
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Part of the Clover Leaf
Join Date: May 2011
Location: NW Burbs of Detroit Mi.
Posts: 1,047
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by sammy37
Just out of curiousity, why is it bad to do this? I've read of people using this method but have never come across one. They're just using that terminal to run a 24 solenoid, correct?
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It will cause the thermostat to overshoot set point and overheat the conditioned space.
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12-27-2012, 06:24 PM
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#9
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Member
Join Date: Aug 2012
Location: Canada ontario
Posts: 117
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Aprilaire 700 incorrectly wired to the furnace
Ive never had an inicdent where doing it this method was causing a problem , as long as the transformer on the pc board can handle the . v/a of it its ok ,,, thats right from the mfg of furnaces... but the correct way is to use its own power supply to the humidifer ,,,
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12-27-2012, 08:38 PM
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#10
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Part of the Clover Leaf
Join Date: May 2011
Location: NW Burbs of Detroit Mi.
Posts: 1,047
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by hvac dude
Ive never had an inicdent where doing it this method was causing a problem , as long as the transformer on the pc board can handle the . v/a of it its ok ,,, thats right from the mfg of furnaces... but the correct way is to use its own power supply to the humidifer ,,,
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I suggest you do a little more in depth study on connecting to C and W.
No matter where you set the anticipator, the amp draw will be wrong for the setting and the length of the furnace run cycle will be affected.
All furnace install instructions dictate only dedicated terminals be used for humid hook up.
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12-27-2012, 09:04 PM
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#11
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Member
Join Date: Aug 2012
Location: Canada ontario
Posts: 117
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Aprilaire 700 incorrectly wired to the furnace
sorry i shuda clarified .. this type of install is only usually done with electronic thermostats sry
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12-27-2012, 09:38 PM
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#12
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Member
Join Date: May 2010
Location: winnipeg manitoba canada
Posts: 688
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Aprilaire 700 incorrectly wired to the furnace
have not set an anticipator for at least five years...... there from Fred Flinstones days....... 
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12-28-2012, 07:05 AM
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#13
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Part of the Clover Leaf
Join Date: May 2011
Location: NW Burbs of Detroit Mi.
Posts: 1,047
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by hvac dude
sorry i shuda clarified .. this type of install is only usually done with electronic thermostats sry
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Point taken....if you are using a s'tat that is battery powered only.
We like to use stats powered off the furnace power supply. And the last time I checked the furnace install instructions said "No external loads should be connected to terminal strip" because the solenoid of the humid causes a voltage drop that will cause erratic furnace operation.
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12-28-2012, 07:10 AM
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#14
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Part of the Clover Leaf
Join Date: May 2011
Location: NW Burbs of Detroit Mi.
Posts: 1,047
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by carmon
have not set an anticipator for at least five years...... there from Fred Flinstones days....... |
Still see a lot of new snap-action t'stats w/anticipatos ...some folks don't trust electronic t'stats.
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The Following User Says Thank You to hvac5646 For This Useful Post:
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12-28-2012, 09:17 AM
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#15
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Member
Join Date: Nov 2008
Posts: 263
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Aprilaire 700 incorrectly wired to the furnace
Quote:
Originally Posted by hvac dude
... but the correct way is to use its own power supply to the humidifer ,,,
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They make it easy for you: included (at least they did in the past) with the unit is a 24V transformer.
V
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