rdepoort
20-12-2009, 06:42 PM
Hi everybody:
I have an old Daikin RY100F (ext unit) + FHYB100 (ceilling unit with plenum), R22 gas, with a BRC1B62/52 remote contoller to heat/cool a 1500 sq ft or so house (installed 1999).
It works fine except for 10-15 days /year (when temp # 28-36 °F) and more or less humid: too much frost on the ext unit, and the defrost procedure runs whenever it wants (and not long enough): As a results, ice builds up on the heat exchanger, and in extreme case I have to use a steam generator to get rid of it! Also, the temp from the ceiling outlets varies between 86 (no heat pump really!) and 122 °F (quite happy!) for say 32-35 °F outside: try your luck!
I derived a remote switch (from the force defrost switch on the control board on the outside unit) in one of the rooms to force it to defrost whenever it ices too much: better than nothing but not really practical and not top notch in terms of efficacy.
I believe it is possible to modify the defrost interval and/or time parameters from the settings on the BRC controller: I checked, I found 18 settings (from 10 to 29), and half of them with 2 numbers (example: 0 – 01 for setting 10).
I can’t find the info on the web, and would really appreciate if someone could tell me which settings control defrost parameters, and what are the values for shorter interval/longer defrost time.
Thanks in advance for any info.
I have an old Daikin RY100F (ext unit) + FHYB100 (ceilling unit with plenum), R22 gas, with a BRC1B62/52 remote contoller to heat/cool a 1500 sq ft or so house (installed 1999).
It works fine except for 10-15 days /year (when temp # 28-36 °F) and more or less humid: too much frost on the ext unit, and the defrost procedure runs whenever it wants (and not long enough): As a results, ice builds up on the heat exchanger, and in extreme case I have to use a steam generator to get rid of it! Also, the temp from the ceiling outlets varies between 86 (no heat pump really!) and 122 °F (quite happy!) for say 32-35 °F outside: try your luck!
I derived a remote switch (from the force defrost switch on the control board on the outside unit) in one of the rooms to force it to defrost whenever it ices too much: better than nothing but not really practical and not top notch in terms of efficacy.
I believe it is possible to modify the defrost interval and/or time parameters from the settings on the BRC controller: I checked, I found 18 settings (from 10 to 29), and half of them with 2 numbers (example: 0 – 01 for setting 10).
I can’t find the info on the web, and would really appreciate if someone could tell me which settings control defrost parameters, and what are the values for shorter interval/longer defrost time.
Thanks in advance for any info.