DRAIN PIPE CONNECTION
The fan coil is equipped with a drain hose. It is tied together with the refrigerant piping. During installation, it is important to observe the following instructions to prevent water overflowing from the drain pan.
!Insure that the indoor unit is level and not tilted forwards or backwards.
!Insure that the drain hose does not rise above the drain pan. It should be sloping towards the hole.
!Route the drain hose through the same hole as the refrigerant pipes.
!If the drain pipe extends horizontally a long way, use PVC tubing to provide heat insulation.
!Outside insert the drain hose into a PVC drainpipe and not the other way around and glue them together.
!Run the PVC drainpipe straight down the wall. There should be no traps and avoid putting the end of the pipe into water.
!Ensure that all sections of the PVC pipes are glued securely together.
!Ensure that the entire indoor part of the drain hose is insulated to avoid condensation from dripping.
!Drain pipe may be required for heat pump unit and should be connected if necessary.
SLIME
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| Downward |
| Down- | Slant | |
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| ward |
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Drain Pipe | slant |
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| Drain Pipe |
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• Traps | The lack of a |
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Trap | downward |
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slope causes |
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| water to build |
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| up and |
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| overflow the | Traps | |
| drain pan. |
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Even if there is a downward slope overall, there must not be any “double traps” formed
• Long Horizontal Extensions
Gap of approximately 50 cm
Good |
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| Stiff vinyl |
Secure in place | chloride (PVC) |
with saddles | tubing |
No good | Trap effect created |
| Flexible tube |
| Good |
| No good |
| Drain hose |
| Drain water cannot |
| flow freely |
Drainage gutter | Drainage gutter |
Water leakage due to a clogged drain hose can be caused by accumulated dirt in the drain pan or by a buildup of slime inside the drain hose.
Slime is caused by the following factors:
!Temperature : 25°C (77°F) to 30°C(86°F)
!Accumulated water
!Nutrients (components of perspiration and dust in the air)
!A combination of certain types of mold and bacteria.
To reduce the chance of clogging, it is very important to ensure that the drain hose has a downward slant to prevent water from accumulating and a clean and a well ventilated environment.