Recalls and Service Alerts

Furnaces - Air Conditioners - Heat Pumps

TAM7 Pump Down Issue Models: TAM7 Air Handlers

Type: Service Alert
Equipment: Air Handler
Recall or Alert Date: 07-16-2013
Serial Number: SSA-SVB26A-EN
Brands Affected: American StandardTrane

Description of Problem:

We have received reports of periodic pump downs in outdoor products that utilize the unloading scroll compressor (step scroll) due to an issue with the TAM7 EEV Control board. The actions described in this bulletin are not being taken to address a safety concern. This is a “fix-on-fail” action.

The refrigerant system pumping down results in cycling of the outdoor unit on the LPCO (Low Pressure Cut Out). The pump down condition may occur randomly during operation. This condition is not necessarily seen during startup. Testing has shown that the CNT06879 EEV Control board may cause the EEV to close to the point which may cause the LPCO to trip. It has been determined that this issue is caused by the firmware associated with CNT06879.

Affected Products:

List of Affected Air handler Models
TAM7A0A24H21SBB TAM7A0B30H21SBB TAM7A0C36H31SBB TAM7A0C48H41SBA
TAM7A0A24H21SCB TAM7A0B30H21SCB TAM7A0C36H31SCB TAM7B0C60H51SAA
TAM7A0B30H21SBA TAM7A0C36H31SBA TAM7A0C42H31SBA TAM7B0C60H51SBA

AC Models with Unloading Scroll Compressor
4TTX6024A1000AA 4TTX6036E1000AA 4TTX6048G1000BA 4TTX8036A1000AA 4TTR6048A1000BA
4TTX6024B1000AA 4TTX6036E1000AB 4TTX6060A1000AA 4TTX8048A1000AA 4TTR6048A1000AA
4TTX6024C1000AA 4TTX6036G1000AA 4TTX6060B1000AA 4TTX8060A1000AA 4TTR6060A1000AA
4TTX6024E1000AA 4TTX6036G1000BA 4TTX6060B1000BA 4TTR7024A1000AA 4TTR6060A1000BA
4TTX6024G1000AA 4TTX6048A1000AA 4TTX6060C1000AA 4TTR7036A1000AA 4TTR6061B1000AA
4TTX6024G1000BA 4TTX6048B1000AA 4TTX6060C1000AB 4TTR7048A1000AA 4TTX5061E1000AA
4TTX6036A1000AA 4TTX6048B1000BA 4TTX6060E1000AA 4TTR7060A1000AA 4TTX5061E1000BA
4TTX6036B1000AA 4TTX6048C1000AA 4TTX6060E1000BA 4TTR6024A1000BA 4TTX5061E1000CA
4TTX6036B1000BA 4TTX6048E1000AA 4TTX6060E1000CA 4TTR6024A1000AA 4TTX6061H1000AA
4TTX6036C1000AA 4TTX6048E1000BA 4TTX6060G1000AA 4TTR6036A1000BA 4TTR5061E1000AA
4TTX6036C1000AB 4TTX6048G1000AA 4TTX8024A1000AA 4TTR6036A1000AA 4TTR5061E1000BA
4TTR5061E1000CA 4A7A6024G1000AA 4A7A6048B1000AA 4A7A6060C1000AA 4A7A5061E1000CA
4TTB4061E1000AA 4A7A6024G1000BA 4A7A6048B1000BA 4A7A6060C1000BA 4A7A6061H1000AA
4TTB4061E1000BA 4A7A6036A1000AA 4A7A6048C1000AA 4A7A6060E1000AA
4TTB4061E1000CA 4A7A6036B1000AA 4A7A6048C1000BA 4A7A6060E1000BA
4TTB4061E1000DA 4A7A6036B1000BA 4A7A6048E1000AA 4A7A6060E1000CA
4TTB6061A1000AA 4A7A6036C1000AA 4A7A6048E1000BA 4A7A7024A1000AA
4A7A6024A1000AA 4A7A6036C1000BA 4A7A6048G1000AA 4A7A7036A1000AA
4A7A6024B1000AA 4A7A6036E1000AA 4A7A6048G1000BA 4A7A7048A1000AA
4A7A6024C1000AA 4A7A6036G1000AA 4A7A6060A1000AA 4A7A7060A1000AA
4A7A6024C1000BA 4A7A6036G1000BA 4A7A6060B1000AA 4A7A5061E1000AA
4A7A6024E1000AA 4A7A6048A1000AA 4A7A6060B1000BA 4A7A506E1000BA

HP Models with Unloading Scroll Compressor
4TWX6024A1000AA 4TWX6048B1000BA 4TWR7036A1000AA 4A6H6024E1000BA 4A6H6048G1000AA
4TWX6024B1000AA 4TWX6048C1000AA 4TWR7048A1000AA 4A6H6024G1000AA 4A6H6048G1000BA
4TWX6024C1000AA 4TWX6048E1000AA 4TWR7060A1000AA 4A6H6024G1000BA 4A6H6060A1000AA
4TWX6024E1000AA 4TWX6048E1000BA 4TWR6024A1000AA 4A6H6024G1000ABB 4A6H6060B1000AA
4TWX6024E1000AB 4TWX6048G1000AA 4TWR6024A1000BA 4A6H6036A1000AA 4A6H6060B1000BA
4TWX6024E1000BA 4TWX6048G1000BA 4TWR6024A1000BB 4A6H6036B1000AA 4A6H6060C1000AA
4TWX6024G1000AA 4TWX6060A1000AA 4TWR6036A1000AA 4A6H6036B1000BA 4A6H6060C1000BA
4TWX6024G1000BA 4TWX6060B1000AA 4TWR6036A1000AB 4A6H6036C1000AA 4A6H6060E1000AA
4TWX6024G1000BB 4TWX6060B1000BA 4TWR6036A1000BA 4A6H6036C1000BA 4A6H6060E1000BA
4TWX6036A1000AA 4TWX6060C1000AA 4TWR6048A1000AA 4A6H6036E1000AA 4A6H6060E1000CA
4TWX6036B1000AA 4TWX6060C1000AB 4TWR6048A1000BA 4A6H6036E1000BA 4A6H6060G1000AA
4TWX6036B1000BA 4TWX6060E1000AA 4TWR6060A1000AA 4A6H6036G1000AA 4A6H7024A1000AA
4TWX6036C1000AA 4TWX6060E1000BA 4TWR6060A1000BA 4A6H6048A1000AA 4A6H7036A1000AA
4TWX6036C1000AB 4TWX6060E1000CA 4A6H6024A1000AA 4A6H6048B1000AA 4A6H7048A1000AA
4TWX6036E1000AA 4TWX8024A1000AA 4A6H6024B1000AA 4A6H6048B1000BA 4A6H7060A1000AA
4TWX6036E1000BA 4TWX8036A1000AA 4A6H6024C1000AA 4A6H6048C1000AA
4TWX6036G1000AA 4TWX8048A1000AA 4A6H6024C1000BA 4A6H6048C1000BA
4TWX6048A1000AA 4TWX8060A1000AA 4A6H6024E1000AA 4A6H6048E1000AA
4TWX6048B1000AA 4TWR7024A1000AA 4A6H6024E1000AB 4A6H6048E1000BA

Source:

Trane