I have the fixed speed ARUF374316 air handler for my Goodman GSH14036 heat pump. The Installation and Operating Instructions have a seperate sheet of paper titled "Supplimental Insert, Electronic Blower Time Delay Relay, B13707-35".

There is a 7 second delay for the air handler fan to start after the condenser starts. There is a 65 second delay for the air handler fan to continue to run after the condenser shuts off. This TDR is currently operating properly on my system.

Note that heat pumps require a certain amount of run time to reach optimal output temps. Even with a functioning TDR, I still get "cool" air for the first few minutes.

The palm of your hand is about 91F, so any air at or near that temp will feel cool.

Take care.

What I notice is the air handler fan and the outside fan or comp unit turn on at the same time so Im assuming that the delay must not work. It also shuts off at the same time.I dont believe its labeled a tdr but it does identify a type of delay relay. According too the wiring diagram it leads to a regular dp relay.It does have a set of sequencers which delay time but I replaced it with a similar one and nothing changed. They also dont have them on the wiring diagram.thanks for the response.

My Carrier has the air handler and compressor turn ON simultaneously ... but the compressor turns OFF first, then the blower after a short delay.

older units didn't usually have the delay timer module, newer ones do.....