Drain Pipe Installation - Toshiba MMU-AP0091H Installation Manual

Super modular multi outdoor / indoor unit air conditioners
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10. DRAIN PIPE INSTALLATION

10-1. Natural Draining
1. The drain pipe should have a downward slope of at least 1/100.
2. The drain pipe should be as short as possible, and routed so that air pockets will not form.
3. The horizontal run should be as short as
possible. If it must be long, support it with
hanging supports at the prescribed
intervals (to prevent undulations in the
pipe).
Nominal
diameter
Hard polyvinyl
25 to 40mm
chloride pipe
CAUTION
1) The drain pipe should be at least as large as the size of the drain pipe connector on the indoor unit.
2) Insulate drain pipes completely.
Failure to insulate drain pipes will allow condensation to form.
Insulate the pipe and the connector on the indoor unit as well.
3) Make all connections completely.
(Especially when using polyvinyl chloride pipe, do not forget to apply the adhesive for hard polyvinyl
chloride.)
10-2. Collective Drain Piping
1. Connections to a horizontal main pipe should be dropped in from above. Furthermore, use pipe with a
nominal diameter of at least VP20 (VP30) for the collective drain pipe.
2. Limit as much as possible the number of
units that drain into a collective pipe in
order to keep the length of the horizontal
main pipe to a minimum.
3. Do not connect models with a built-in
drain pump and models that use gravity
drains to the same horizontal pipe.
10-3. Selecting the Diameter for the Collective Pipe
Calculate the amount of drain water based on the number of
indoor units that will be connected to the collective drain pipe,
and select the pipe diameter accordingly.
Assume 2 liters/hour per horsepower for the amount of drain
water produced by an indoor unit.
• The above table is for a horizontal pipe.
Support bracket
interval
Within 1.5 to 2m
Do not let the drain
pipe slope upwards.
Use as long a pipe
as possible (10cm)
Downward slope (at least 1/100)
(a drop of 1cm per meter)
1.5m to 2m
Support
bracket
Downward
slope at
least 1/100
Heat insulation
Do not leave the
NG
end of the drain
hose in water.
Insulation
VP25 (Outer dia. : Ø32mm)
VP30
(Outer dia. : Ø38mm)
Nominal
30
40
50
102
NG
Over another
pipe
NG
Trap
Do not leave any
undulations in the
drain pipe.
NG
NG
Polyethylene foam with
a thickness of 6mm
Downward slope
of at least 1/100
Inner dia.
Allowable volume
(mm)
(Grading 1/100)
31
88 l /hr
40
175 l /hr
51
334 l /hr
Extended
bent stack

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