1. 2-Stage Heat Pump Defrost Options Defrost options: –30, 60, 90, 120 or Auto (Infinity/Evolution only) Defrost initiate temp: 32° F Defrost terminate temp: 65° F –Lower defrost noise Normal defrost only occurs below 50° F outdoor temperature

2. Ideal/Perfect Defrost Infinity/Evolution Set as Default in UI DEFROST TIMENEXT DEFROST INTERVAL < 3 minutes120 minutes 3 to 5 minutes90 minutes 5 to 7 minutes60 minutes > 7 minutes30 minutes

3. 2- Stage Heat Pump Forced Defrost Forced defrost pins provided on board Command also available at User Interface Short pins for 5 sec and release or UI command If coil temp is below initiate and outdoor temp is below 50 – full defrost cycle If coil temp is above initiate temp OR outdoor temp is above 50 – 30 second defrost cycle occurs

4. Time Delays One minute off between stages – Bristol only 5 minute mandatory high Stage on power up or 12 hours of standby – Bristol only Auxiliary heat remains energized for 15 seconds after defrost completion

5. 20 second outdoor fan delay after defrost –Reduces fog effect 1 minute delay in cooling mode before turning outdoor fan off if outdoor temp is 100 deg F or higher –For easier starting Time Delays

6. 2 minute to return to standby from last valid communication 5-minute time guard between compressor cycles –Can be defeated by shorting forced defrost pins for 1 second and releasing –Can also be sped up by pressing fan and temp up together Time Delays

7. Outdoor Thermistors Verification Considered open if resistance is reads 500K Ohms or higher (-50ºF or below) Considered shorted if resistance reads 1K ohms Or lower (188ºF or higher) Coil and Outdoor temp thermistors are compared to verify proper range If thermistors are failed, system reverts to default operation

8. Begins 20 min after defrost termination Ignored during low ambient cooling Ignored until unit as run for 5 consecutive minutes Outdoor Thermistors Comparison

9. If the outdoor thermistor indicates  30  F warmer than the coil thermistor OR If the outdoor thermistor indicates  10  F cooler than the coil thermistor Outdoor Thermistors Comparison Range Error – Heating Might Change

10. If the outdoor thermistor indicates  10  F warmer than the coil thermistor OR If the outdoor thermistor indicates  20  F cooler than the coil thermistor` Outdoor Thermistors Comparison Range Error – Cooling MIGHT CHANGE

11. Thermistor Failure Default Operation