Across
- 5. cushions water pressure in hydronics systems
- 6. shuts off power to a furnace when not depressed
- 8. lights gas entering heat exchangers
- 10. controls temperature
Down
- 1. shuts off gas valve when furnace overheats
- 2. allows gas into burners
- 3. proves a draft
- 4. keeps dust and debris from entering furnace
- 7. circulates water through hydronic heating systems
- 9. protects the transformer