Daikin RXQ18PY1 [203/355] Example 3 drain pipe trap shape defective

Daikin RXQ32PY1 [203/355] Example 3 drain pipe trap shape defective
SiEN34-705 Appendix
General Information 197
7.14.3 Example 3: Drain Pipe Trap Shape Defective
Situation Indoor unit was fitted with a drain trap but a leak occurred during subsequent operation.
Source of
Problem and
Remedial Action
The trap was not properly shaped thus preventing it from functioning effectively as a trap and
resulting in drain leakage. The trap was reshaped and the fault disappeared.
Main Points ! Duct types (40~125) require a drain trap.
Reason:There is resistance on the air inlet side caused by the heat exchanger and air filter and
this in turn creates negative pressure in relation to the atmospheric pressure on the discharge
side. If there is no drain trap then air will be drawn in from the drain pipe and the waste water
splashed around giving rise to the risk of water overflowing from the drain pan. To avoid this
problem it is therefore necessary to design a trap which takes account of the maximum negative
pressure which is likely to be created on the suction side.
Negative pressure
Negative pressure
Trap ineffective
H
1
= 50 mm or more
H
2
= 1/2 H
1
H
1
= 0 mm

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