Drain Piping Work - Mitsubishi Electric PFAV-P250VM-E Manuel D'installation

P500·P600-F models
Follow the procedure below to connect the supplied pipes by brazing.
* When brazing, take care that the flame of the torch does not come into contact
with the thermistor and LEV wiring.
(1) Remove the front bottom panel and filter.
(2) When drawing the pipe out from the right, punch the knockout for the
refrigerant pipe on the right side.
When drawing the pipe out from the left, punch the knockout for the
refrigerant pipe on the left side.
(3) Cut the charge pipe (part indicated by X mark) of the gas piping/cap
piping shown in [Fig. 6.1.4] to let out the nitrogen gas sealed inside the
pipe.
(4) Remove the rubber caps from the gas pipe connections and liquid pipe
connections shown in [Fig. 6.1.4]. Perform this work from the front.
(5) Connect the supplied pipes and locally procured pipes by brazing from
the front as shown in [Fig. 6.1.5] and [Fig. 6.1.6].
Note 1: When drawing out the pipe from the right, perform brazing in the
order shown below.
Connections for locally procured pipes ([Fig. 6.1.6]) 
Connections for supplied pipes ([Fig. 6.1.5])
Note 2: When brazing locally procured pipes, take care that the flame of
the torch does not come into contact with any surrounding
material.
(6) Attach the pipe cover as shown in [Fig. 6.1.6].
P750·P900-F models
Follow the procedure below to connect the supplied pipes by brazing.
* When brazing, take care that the flame of the torch does not come into contact
with the thermistor and LEV wiring.
(1) Remove the front bottom panel by unscrewing the three fixing screws at
the top and bottom of the panel.
(2) When drawing the pipe out from the right, punch the knockout for the
refrigerant pipe on the right side.
When drawing the pipe out from the left, punch the knockout for the
refrigerant pipe on the left side.
When drawing the pipe out from the back, punch the knockout for the
refrigerant pipe on the back side.
(3) Cut the charge pipe (part indicated by X mark) of the gas piping/cap piping
shown in [Fig. 6.1.8] to let the nitrogen gas sealed inside the pipe.
(4) Remove the brazing caps from the gas pipe connections and liquid pipe
connections shown in [Fig. 6.1.7]. Perform this work from the front.
(5) Connect the supplied pipes and locally procured pipes by brazing from the
front.
Note 1: When brazing locally procured pipes, take care that the flame of
the torch does not come into contact with any surrounding
material.
(6) Attach the pipe cover as shown in [Fig. 6.1.9].
[Fig. 6.1.1] (P.5) When viewed from left side of unit
A Service panel
C Closed-end pipe cap (liquid)
E Closed-end pipe cap (gas)
<A> Viewed from the direction of arrow A
[Fig. 6.1.2] (P.5) When viewed from left side of unit
A Service panel
C Refrigerant pipe 2 (liquid)
E Maintenance access hole
G Knockout holes for refrigerant pipes
[Fig. 6.1.3] (P.5) When viewed from front of unit
A Field-installed pipe (liquid)
C Field-installed pipe (gas)
<A> (Pipes routed on the left of the unit)
<B> Caulk the gap between the pipe cover (field supplied) and the access hole on
the side panel.
<C> Insert at least 50 mm of the end of the pipe covers (liquid/gas) into the access
hole on the side panel.
<D> Caulk the gaps around the field-installed pipes and pipe covers to keep
condensation out.
* This also applies when routing the pipe on the left.
[Fig. 6.1.4] (P.5) When viewed from front of unit
A Cap pipe (Gas pipe)
[Fig. 6.1.5] (P.5) When viewed from left side of unit
A Supplied pipe connection parts
B L bend pipe 2 (for liquid pipe)
D Knockout holes for refrigerant pipes
[Fig. 6.1.6] (P.5) When viewed from front of unit
A Connections for locally procured pipes
B Locally procured pipes (gas and liquid)
16
B Closed-end pipe cap (gas)
D Maintenance access hole
F Unit front
B L-shaped pipe 1 (gas)
D Connection to the supplied pipe
F Unit front
B Connection to the field-installed pipe
B Rubber cap (Liquid pipe)
C L bend pipe 1 (for gas pipe)
<A> (When drawing the pipe out from the left)
<B> Caulk the side panel through holes and pipe covers (procured locally) to
ensure there is no gap.
<C> Insert the covers for the liquid pipe and gas pipe at least 50 mm into the side panel.
<D> Perform caulking or other measures to prevent dew condensation water from
entering the locally procured pipe covers.
* The same procedures apply when drawing out the pipes from the left.
[Fig. 6.1.7] (P.6)
A Gas refrigerant line
[Fig. 6.1.8] (P.6)
A Cut off the charging pipe on the closed-end gas pipe to release the nitrogen gas
inside the pipe.
B Cutoff
[Fig. 6.1.9] (P.6)
A <Inside the indoor unit>
C Side (or rear) panel

6.2. Drain piping work

[Fig. 6.2.1] (P.6)
A Machine room
C Drain
[Fig. 6.2.2] (P.6)
A Drain plug
C Side panel through hole
[Fig. 6.2.3] (P.6)
A Unit
C Open sewer
• Ensure that the drain piping is downward (pitch of more than 1/100) to the
outdoor (discharge) side.
• Ensure that any cross-wise drain piping is less than 20 m (excluding the
difference of elevation). If the drain piping is long, provide metal braces to
prevent it from waving. Never provide any air vent pipe. Otherwise drain may
be ejected.
• When using a PVC pipe, be sure to connect the pipe properly with PVC
based bond.
• To prevent air intake from the drain pipe, be sure to provide a drain trap.
• Make sure the collection pipe is at a position that is around 10 cm lower than
that of the unit drain outlet, and make sure that the collection pipe is VP35 or
more, and connect the pipe so that there is a decline of 1/100 or more.
• Put the end of the drain piping in a position where no odor is generated.
• Do not put the end of the drain piping in any drain where ionic gases are
generated.
• Check drainage by pouring water into the drain pan and check to see that it
drains properly.
• The drain pipe is connected to the right side of the unit at the time of
shipment, but it can be changed to the left side. To do so, remove the drain
plug inserted in the drain pan left side and insert it in the right side. Use seal
tape to ensure the drain plug is sealed properly.
• The drain pan installed in this model is horizontal at the time of shipment, but
it is possible to set it in a tilted position to change the securing position of the
screw on the unit side. To set the drain pan in a tilted position, perform the
work according to the procedure below.
• Install the supplied insulating cap on the drain plug on the unit panel opposite
from the drainpipe side as shown in Fig. 6.2.2. (P300-F·P600-F models)
Note: Install the insulating cap so that the hole on the side panel is
completely sealed.
• Drain piping will be required at two (upper/lower) parts for P750·P900-F
models. For the collective draining of the two pipes, position the connected
pipe at the point lower than the upper pipe to avoid an inflow from the upper
pipe to the lower.
B Liquid refrigerant line
B Refrigerant pipe (field supplied)
D Pipe cover (field supplied)
B Drain Pan
B Heat insulation cap
D Remove the separator
B Drain pan