York R-410A, Technical & Service Manual, Page: 269 / 385

Installation
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5. Processing &Installation of drainage pipe
5.1) Gradients and Supporting
5.1.1 Keep the drainpipe sloping downwards at a gradient of at least 1/100. Keep the drainpipe
as short as possible and eliminate the air bubble.
5.1.2 The horizontal drainpipe should be short. When the pipe is too long, a prop stand must be
installed to keep the gradient of 1/100 and prevent bending. Refer to the following table for the
specification of the prop stand.
Diameter Distance between the prop stands
Hard PVC pipe 25~40mm 1.5~2m
5.1.3 Precautions
5.1.3.1 The diameter of drainpipe should meet the drainage requirement at least.
5.1.3.2 The drainpipe should be heat-insulated to prevent atomization.
5.1.3.3 Drainpipe should be installed before installing indoor unit. After powering on, there is
some water in water-receiver plate. Please check if the drain pump can act correctly.
5.1.3.4 All connection should be firm.
5.1.3.5 Wipe color on PVC pipe to note connection.
5.1.3.6 Climbing, horizontal and bending conditions are prohibited.
5.1.3.7 The dimension of drainpipe can’t less than the connecting dimension of indoor drainpipe.
5.1.3.8 Heat-insulation should be done well to prevent condensation.
5.1.3.9 Indoor units with different drainage type can’t share one convergent drainpipe.