condensate drainage problems

[mr saw]

thanks for all the responses, the traps and filters are all ok, what i find when system operating is the condensate water in the condensate pan is pulled by the suction of the supply fans to such a degree that the water is kept away from the drainage pipe almost lifted out of the tray. when an access panel is opened up stream then the water flows down the trap quite freely.

[frank]

Your trap on the drainage line should be close to the drain pan and at least 150mm deep then the drain should fall away from the trap. If you have a large static pressure on the fan the drain line may need to be larger than 20mm diameter

[Brian_UK]

thanks for all the responses, the traps and filters are all ok, what i find when system operating is the condensate water in the condensate pan is pulled by the suction of the supply fans to such a degree that the water is kept away from the drainage pipe almost lifted out of the tray. when an access panel is opened up stream then the water flows down the trap quite freely.

You say that traps are OK but they don't seem to be working.

Check the static pressure at the trap inlet and ensure that the trap is deep enough.

Something on the inlet side of the fan is blocked to have increased the suction pressure from what, we assume, was a working drainage system.

Blocked filter, collapsed filter, dirty coil, fire damper dropped, inlet grille damper closed etc.

[mr saw]

the evaporator coil did have a carpet layer of dirt which has been clean, thinking about it the coil would really need a deep clean because internally it is still floud to a degree. thanks chaps...

[Makeit go Right]

The Fresh air intake louver will normally have a bird wire screen behind it, which can get clogged up after a while. Maintenance deals with filters but can miss this one.

Might be worth a check if all else looks okay on the suction side of fan.