AlexLPD
28-10-2014, 02:16 AM
Hi, to you all.
11814
Display case, a 10th or more years, R22 system on a 1HP condenser. 220V on a monofasic. The condenser is on the first floor around a 3.5M above the displaycase.
So long story short... A client call me his display case wasnt cooling, so we check the condenser... someone bridge the low pressure protection, an pipe got a fiction hole and loose all the gas, the compressor burnout. The system is running or R22
We changue the compressor, the low pressure protection, the filter dryer. And turn on the equipment, the first pressures was arround LP 30Psi, HP 150Psi.
11817
So we let it for around 1 hr and the compressor gets really hot... We take all the numbers witch are;
LP 175Psi Temp. 34.4°C
HP 30Psi Temp. 18.0°C
Comp. Amp 5.09A / 7.5A
Cond Air In. 20.1°C
Cond Air Out 30.8°C
Superheat 32.2°C
Subcooling 0.6°C
So far, the main problem was there was almost not cold in to the suction line to refrigerate the compressor, and causing it to raise is temp. After an hours to be runnig the compressor reach 80°C file:///C:/Users/ALEJAN~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png
11818
Following a chart, we found a very like failure may be the TXV, so we go there and changue it, and old Alco, for a new Danfoss No.2 Oriffice.
We add some refrigerant ang get this more likely numbers;
The design of the evaporator is a giant coil of copper tube of 5/8, in the floor of the cold display, then a axial fans move the air inside.
11816 11815
The new set of numbers;
LP 180Psi Temp. 33°C
HP 35Psi Temp. -1.3°C
Comp. Amp 5.7A / 7.5A
Cond Air In. 24°C
Cond Air Out 30.°C
Superheat -8.7°C
Subcooling 1.8°C
Observation::rolleyes::rolleyes::rolleyes::rolleyes::rolleyes:
I have instaled coldrooms and in those when the compressor start the cycle and in the sigth glass, its easy to see the liquid refrigerant moving ahmm to lack of an clearly explanation, fast, or with speed, on this particular system, the sigthglass do show liquid moving, but is more like an slow stream. ?¡?¡?
At this point the compressor is getting some cold of the succion line, the pipe sweat and even gets frosty at the end of the cycle, how ever Im concern because the compressor is reaching 42°C and I think is execesive for a brand new compressor.:(:(:(
Any tougths on this?
im thinking on changue to a #3 oriffice, to allow more refrigerant to flood the coil, maybe add some liquid to the system to reach the same pressures.
11814
Display case, a 10th or more years, R22 system on a 1HP condenser. 220V on a monofasic. The condenser is on the first floor around a 3.5M above the displaycase.
So long story short... A client call me his display case wasnt cooling, so we check the condenser... someone bridge the low pressure protection, an pipe got a fiction hole and loose all the gas, the compressor burnout. The system is running or R22
We changue the compressor, the low pressure protection, the filter dryer. And turn on the equipment, the first pressures was arround LP 30Psi, HP 150Psi.
11817
So we let it for around 1 hr and the compressor gets really hot... We take all the numbers witch are;
LP 175Psi Temp. 34.4°C
HP 30Psi Temp. 18.0°C
Comp. Amp 5.09A / 7.5A
Cond Air In. 20.1°C
Cond Air Out 30.8°C
Superheat 32.2°C
Subcooling 0.6°C
So far, the main problem was there was almost not cold in to the suction line to refrigerate the compressor, and causing it to raise is temp. After an hours to be runnig the compressor reach 80°C file:///C:/Users/ALEJAN~1/AppData/Local/Temp/msohtmlclip1/01/clip_image001.png
11818
Following a chart, we found a very like failure may be the TXV, so we go there and changue it, and old Alco, for a new Danfoss No.2 Oriffice.
We add some refrigerant ang get this more likely numbers;
The design of the evaporator is a giant coil of copper tube of 5/8, in the floor of the cold display, then a axial fans move the air inside.
11816 11815
The new set of numbers;
LP 180Psi Temp. 33°C
HP 35Psi Temp. -1.3°C
Comp. Amp 5.7A / 7.5A
Cond Air In. 24°C
Cond Air Out 30.°C
Superheat -8.7°C
Subcooling 1.8°C
Observation::rolleyes::rolleyes::rolleyes::rolleyes::rolleyes:
I have instaled coldrooms and in those when the compressor start the cycle and in the sigth glass, its easy to see the liquid refrigerant moving ahmm to lack of an clearly explanation, fast, or with speed, on this particular system, the sigthglass do show liquid moving, but is more like an slow stream. ?¡?¡?
At this point the compressor is getting some cold of the succion line, the pipe sweat and even gets frosty at the end of the cycle, how ever Im concern because the compressor is reaching 42°C and I think is execesive for a brand new compressor.:(:(:(
Any tougths on this?
im thinking on changue to a #3 oriffice, to allow more refrigerant to flood the coil, maybe add some liquid to the system to reach the same pressures.