Controls - 42 HT220 Operator’s Manual Top Console Top Console 1. Fan power control 7. Temperature control 2. Ext 8. Cab light switch 3. Climate control circuit breaker 9. Defrost 4. Display 10. Auto 5. Cab pressurizer switch 11. On 6. Econ 12. Off CMW Item Description Notes To raise the rate of air flow, press control up. To lower the rate of air flow, press control down. To change temperature display from Fahrenheit to or from Celsius, press.