Suburban Aire SA40 - Transformer and Relay

1. Terminal Block
2. Transformer
3. Time Delay Relay
4. Blower Housing

When the room temperature drops below the thermostat setting, the thermostat calls for heat, A 24v. circuit is completed through the Time Delay Relay(3) coil. After three to five seconds, the contacts in the relay close. The blowers come on.