CONDENSATE PIPE SIZE CALCULATOR
What size condensate drain pipe size do I need for my AC system?
To determine the appropriate size of condensate drain pipe size for your air conditioning system, follow these steps:
Enter the achieved piping slope, the drain shall have a slope of not less than 1m per 100m (i.e. 1%)
Enter the cooling capacity of the AC system connected to the drain pipe, this is expressed in kWs of cooling
Enter the ratio of outside air to supply air flow rate, this could be anything between 0 (recirculating air conditioning system) to 1 (full fresh air air conditioning system)
The calculator will provide the minimum condensate drain pipe size required for the system.
Notes:
The diameter of the drain line pipe should be at least the same diameter as the connection provided on the evaporator's drain pan
Provide insulation for the first 3m run of condensate drain from the indoor unit, this is to avoid possible condensation on the external surface of the piping
If the condensate line is under negative pressure e.g. connected to the indoor unit upstream the supply air fan, a drain trap is required
