My problem is I have an air conditioner that someone added a heat pack to. Original air handler runs off a single 20 amp breaker,someone installed a 10 kw heat pack to duct work above furnace. It runs off a double 60 amp breaker. It has a standard 1 heat 1 cool t-stat . I understand that in cooling why energizes g but there is nothing to energize fan relay from w. w from stat goes to sequencer and turns heat pack on. This system needs a fan relay with a time delay so fan keeps running to cool heat pack until sequencer drops out and coil cools. I need help in what relays to use or time delay and not a/c run with heat.