1 / 11

2-Stage Heat Pump Defrost Options

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. DEFROST TIME. NEXT DEFROST INTERVAL.

edan
Download Presentation

2-Stage Heat Pump Defrost Options

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 2-Stage Heat PumpDefrost 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. DEFROST TIME NEXT DEFROST INTERVAL < 3 minutes 120 minutes 3 to 5 minutes 90 minutes 5 to 7 minutes 60 minutes > 7 minutes 30 minutes Ideal/Perfect Defrost Infinity/Evolution Set as Default in UI

  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. Time Delays • 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

  6. Time Delays • 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

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

  9. Outdoor Thermistors ComparisonRange Error – Heating Might Change • 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

  10. Outdoor Thermistors ComparisonRange Error – CoolingMIGHT CHANGE • 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`

  11. Thermistor Failure Default Operation

More Related