frostedflake
09-02-2009, 11:50 PM
greetings RE forum!
i bring to you this unit that has troubled me for my lack of knowledge on the field...(i'm doing lots of homework but still) :o
it is a carrier mini split model (located at condenser unit because evaporator had no data anywhere, not even pcb diagram sticker)
38xca12226-c 12,000BTU's R22 220v 60 hz 3517 W 6amps.
and here the pressures/temps (hope i got them right)
SUCTION pressure at shearer valve at condenser:
60 psi (4.13 bar), measured temperature with type k thermometer located over condensing copper pipe and got a 12C (53F) reading, so i think i have a 9 k superheat.
this condenser unit has no service port for liquid line to evaporator so i only took temperature readings at shaerer valve (16C/60F and condensing on a less than 5mt/15ftinstallation) and a temp of 42C/107F on the condenser air outlet(on a 30C/107F day and with RH at 70%).
as for the evap unit:
room temp 27C/80F and evap air outlet temp is from 15C/59F at start and 12C/53F after 10-15 min operation, and the temp at the entrance of the evap (where a copper bullet goes from there to PCB) is 8C/46C.
here's the background:
no service whatsoever to the unit and over 6 years of use (i know that's a lot), recently cleaned evap and condenser so both got proper air flow, can't measure cfm but there seemed to be a problem with the evaporator motor (it started ok but then rotated very slowly), so i checked the evap fan capacitor and yes the cap was defective, replaced with exact same type cap and evap fan worked fine, however i don't understand the condensation on the liquid line, and the fact that the evaporator turns to fan only after only 10 to 15 min operation, i checked also on the pcb the ohm values for the temp sensors both the one in the front of the grill and the one direct to the copper pipe at the evaporator they seem to be within ohm range.
hope you can give me a little push on this one because is tricking me a lot
thanks in advance!
:)
i bring to you this unit that has troubled me for my lack of knowledge on the field...(i'm doing lots of homework but still) :o
it is a carrier mini split model (located at condenser unit because evaporator had no data anywhere, not even pcb diagram sticker)
38xca12226-c 12,000BTU's R22 220v 60 hz 3517 W 6amps.
and here the pressures/temps (hope i got them right)
SUCTION pressure at shearer valve at condenser:
60 psi (4.13 bar), measured temperature with type k thermometer located over condensing copper pipe and got a 12C (53F) reading, so i think i have a 9 k superheat.
this condenser unit has no service port for liquid line to evaporator so i only took temperature readings at shaerer valve (16C/60F and condensing on a less than 5mt/15ftinstallation) and a temp of 42C/107F on the condenser air outlet(on a 30C/107F day and with RH at 70%).
as for the evap unit:
room temp 27C/80F and evap air outlet temp is from 15C/59F at start and 12C/53F after 10-15 min operation, and the temp at the entrance of the evap (where a copper bullet goes from there to PCB) is 8C/46C.
here's the background:
no service whatsoever to the unit and over 6 years of use (i know that's a lot), recently cleaned evap and condenser so both got proper air flow, can't measure cfm but there seemed to be a problem with the evaporator motor (it started ok but then rotated very slowly), so i checked the evap fan capacitor and yes the cap was defective, replaced with exact same type cap and evap fan worked fine, however i don't understand the condensation on the liquid line, and the fact that the evaporator turns to fan only after only 10 to 15 min operation, i checked also on the pcb the ohm values for the temp sensors both the one in the front of the grill and the one direct to the copper pipe at the evaporator they seem to be within ohm range.
hope you can give me a little push on this one because is tricking me a lot
thanks in advance!
:)