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Your cart is empty.Post-purge fan delay timer with adjustable 12-390-second time delay.
Maoren05
Reviewed in the United States on February 2, 2025
I installed the ICM253 Fan Delay Timer to help with short cycling on my HVAC system, and it does exactly what it’s supposed to. The delay function helps the fan run a bit longer after shutdown, improving efficiency and airflow.Installation was fairly straightforward, but I’d recommend double-checking the wiring instructions—it’s easy to mix up connections if you’re not careful. Once set up, though, it works flawlessly.Overall, a solid upgrade for HVAC efficiency, just take your time with installation!
jack
Reviewed in the United States on February 14, 2024
Delay on break 24v relay timer . Installed on signal side of Hvac blower relay to trick the relay into thinking the Wall Thermostat was still outputting “ Blower ON “ signal keeping the blower running after the Thermostat has already turned off the blower relayBasically turns your regular Blower Relay into a time delayed solid state relay . They call it delay on break ( so when Wall thermostat switches off this timer sees the “ break “ & then applies constant voltage back to the blower relay mimicking “ ON “ signal from Wall thermostat )Follow downloadable manual instruction PDF for this model delay timer ( follow diagram exactly )If wired correctly your splicing it into the 24v Transformer in the Hvac Air handler so it can mimic the 24v signal from the Wall Thermostat when turned off ( for the exact time you’ve got the delay set on with the knob )Used this to leave the Blower running 30 seconds after the unit is signaled off from Thermostat so the Heat Elements could cool off before blower turns offThere are Wall Thermostats out there like Honeywell Pro WiFi @ Zwave that have this feature under “ Advanced Setup “ menu , but there 5x’s the price of this
David
Reviewed in the United States on November 1, 2024
Installed in Trane TEM6 air handler with aftermarket blower motor
John
Reviewed in Canada on April 26, 2024
As others have stated, don't get confused by the external diagram. Use the wiring in the picture attached to this review, and everything will work great. This works best if used to drive an external relay to powe the load. Safest and least confusing that way. Fantastic performance for purging heat from heating coils after thermostat stops calling for heat. Some thermostats have a heat purge delay, and most furnaces have the purge delay built in, regardless of thermostat performance. But when you don't have this feature - such as in garage heaters - and need to build your own, this works perfactly. As states, use to drive an external relay, like in the wiring diagram. Most reliable and least stress on the device.
Mike
Reviewed in the United States on February 19, 2023
This works well but may not work in a circuit that is only looking for a voltage potential rather than current to operate something. Once the 24 vac is applied to terminals 2 & 3, there is a 24 volt reading at terminal 1 and it stays on no matter what happens at terminal 4. I connected it to a relay, which requires current flow to energize it, and used a contact on the relay to break the 24 volt potential at the output, otherwise it wouldn't work because what I am using it on only wants to see that 24 volt potential.
Dwayne Oxford
Reviewed in the United States on July 30, 2017
Mine didn't work, and being's I waited till this spring to install, the warranty had expired. I thought it was year but it's only a month. Ordered another, which is working fine.
Ren Gent
Reviewed in the United States on August 22, 2016
Works as intended--the fan still runs ON SELECTED TIME after the condenser turned off from outside.I set mine to about 2 minutes after the thermostat cuts off the A/C.Installation:Like the diagram on the ICM253 unit.--1 and 4--bypass (undo and reconnect) the current GREEN wire from the Fan (1) and the GREEN wire from the thermostat (4)--2 and 3--tap (add into existing) into the 24vac from the RED (2) and BLUE/common/neutral (3) wiresI did not see the BLUE/COMMON/NEUTRAL 24vac wire once the furnace was opened.The wire diagram makes no sense at all !!!Google and YouTube did not help.So I removed the two screws and take out the cover that protected/covered the wirings and the 24v transformer (besides the breakers).I look for the 24v transformer and its Common/Neutral wire---It has wires out for the 24vac and wires in from the 240vac (labeled on the transformer...see picture).I saw the 24vac Common/Neutral wire (gray colored on this wire).I also saw that it was connected to the condenser outside...I simply tapped into that gray colored wire and done.Hope it helps someone out a bit.Have a great day.
Boulder Larry
Reviewed in the United States on November 23, 2013
My furnace has a built-in delay that keeps the fan running for 60 seconds after the call for cooling ends (as do some electronic thermostats), but I knew there was still a lot of cooling remaining in the evaporator coil if I could only run the fan a little longer.So I installed this little gem on my furnace and set it for its stated maximum of 390 seconds. (The actual delay it delivers is closer to 410 seconds, but I’m not going to quibble.)This relay does exactly what I expected it to do, and at a very attractive price point.The main benefits to me in the dry Colorado climate are:- increases humidity in the house during the cooling season (since much of the humidity remaining on the coil at the end of the cycle is returned to the house instead of going down the drain)- dries the evaporator coil after each cooling cycle making it less likely to get moldy or grow bacteria- improves efficiency of the A/C by extracting more cooling from the electricity used.Wiring was pretty straightforward (but I’m an engineer). The device is installed in series between the G (fan) wire coming from your thermostat and the G terminal on your furnace, but also needs Common and Hot 24 volt connections from the furnace. It also requires the use of “disconnect F” quarter-inch tab connectors and a crimper.Unless you are already skilled with low-voltage furnace wiring or really good at reading wiring diagrams, to avoid damaging your furnace or yourself, I recommend you get a pro (or a skilled friend) to help with the install.
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