aircon50
06-02-2012, 09:15 AM
Hi all
Above unit on a 2004 Transit, approx 6 cu m, with frozen spec insulation (eg freezer side door).
Has been running chilled but client now requires it for frozen. First things first, recover refrigerant, replace drier, and recharge with virgin R404a.
SP - Suct Press (psig). ST - Suct Temp at steel fitting to SPR valve. DP - Disch Press (psig)
RA - Return Air measured with Fluke 77 (Cº). CC - Cab control Temp (Cº)
Running on standby for constant compressor speed.
Time Amb SP ST DP RA CC Notes
15:30 23 18 1.4 270 -11.5 -11
15:45 23 17 1.5 265 -13.0 -13
16:00 24 14 1.8 250 -14.0 -14
16:15 24 13 -0.3 250 -15.3 -15 Suction frosting
16:30 25 13 0.2 250 -16.3 -16 - " -
16:45 25 11 0.6 240 -16.4 -16 - " -
17:00 24 11 -1.1 240 -16.4 -16 - " - heavily
Run through manual defrost and close TXV 1/2 turn.
17:15 23 16 5.0 260 -12.7 -11
17:30 22 13 4.3 240 -15.6 -15
17:45 21 11 2.6 230 -17.8 -16
18:00 21 10 1.5 225 -18.5 -18 Light frost on suction fitting
Comments please!
Another question - is it possible to convert a V090 from R134a to R404a? Apart from the HP and LP switches, will it require the installation of a liquid inj valve?
Thanks in advance
Graham
Above unit on a 2004 Transit, approx 6 cu m, with frozen spec insulation (eg freezer side door).
Has been running chilled but client now requires it for frozen. First things first, recover refrigerant, replace drier, and recharge with virgin R404a.
SP - Suct Press (psig). ST - Suct Temp at steel fitting to SPR valve. DP - Disch Press (psig)
RA - Return Air measured with Fluke 77 (Cº). CC - Cab control Temp (Cº)
Running on standby for constant compressor speed.
Time Amb SP ST DP RA CC Notes
15:30 23 18 1.4 270 -11.5 -11
15:45 23 17 1.5 265 -13.0 -13
16:00 24 14 1.8 250 -14.0 -14
16:15 24 13 -0.3 250 -15.3 -15 Suction frosting
16:30 25 13 0.2 250 -16.3 -16 - " -
16:45 25 11 0.6 240 -16.4 -16 - " -
17:00 24 11 -1.1 240 -16.4 -16 - " - heavily
Run through manual defrost and close TXV 1/2 turn.
17:15 23 16 5.0 260 -12.7 -11
17:30 22 13 4.3 240 -15.6 -15
17:45 21 11 2.6 230 -17.8 -16
18:00 21 10 1.5 225 -18.5 -18 Light frost on suction fitting
Comments please!
Another question - is it possible to convert a V090 from R134a to R404a? Apart from the HP and LP switches, will it require the installation of a liquid inj valve?
Thanks in advance
Graham