Original message
| dewman92164
 |  "Suction line"
, posted Tue 16 Sep 17:55  
Is the suction line (larger insulated line)running from the ac unit to the furnace supposed to be cold or hot.
dewman92164
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Replies:
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| hvactechin
| "Re(1):Suction line" , posted Wed 17 Sep 21:25
The manufacturer includes a superheat and/or a subcooling chart in the cabinet of the condenser(must have gauges to measure). Also if you have a TXV (13 SEER and up) you must make sure the subcooling values are between 10-15 degrees. You can go to the manufacturers web page and research the service facts for the unit.
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| amech
| "Re(1):Suction line" , posted Tue 16 Sep 18:51
The suction line should be beer can cold in the cooling mode (AC) and hot if it is a heatpump in heating mode. To know weather the system is over/under charged, you will need refrigerant gauges compatible for the refrigerant type (R22 - R410a).
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