Geothermal Condensate drain

Please ensure that the condensate drain line installation for the geothermal heat pump unit adheres to the following formal requirements to ensure proper drainage and compliance with local plumbing and building codes:

- Pitch and Alignment: The drain line must be pitched away from the unit. Additionally, pitch the unit toward the drain as illustrated in Figure 2. For units under 2.5 tons (8.8 kW), verify that the pitch does not result in internal condensate leaks.

- Trap Installation: Install an individual condensate trap for each unit. The top of the trap must be positioned below the unit’s drain connection, as shown in Figure 4.

- Trap Design: The trap depth (water-seal) must be designed based on the blower’s External Static Pressure (ESP) capability (e.g., 2 inches of ESP requires a 2-inch trap depth), with a minimum requirement of 1.5 inches.

- Configuration: Each unit must have its own trap and connection to the main line or riser. Do not use common traps or vents. Please also provide a means to flush or blow out the line.

- Venting: A vent is required if the line is prone to collecting dirt/air or if there is a long horizontal run. Vents are also necessary for large units operating against higher ESP than others on a shared main. Note that any installed vent must be located after the trap in the direction of the flow.