Drain Connections - Mitsubishi Electric MVZ-A12AA7 Installation Manual

12. Drain connections

IMPORTANT!
Over-tightening the drain connections could result in drain pan
breakage and failure.
Please follow the following technique for attaching the drain pan
adapter:
1. Apply (2) wraps overlapping of sealing tape
2. Torque the drain pan adapter to 2.5 Nm +/-0.5 [22 in-lb]
The air handler contains ¾" FPT drain connections. When the unit
The air handler contains ¾" FPT drain connections. When the unit is
is used in the vertical position, there is one set. When the unit is
used in the vertical position, there is one set. When the unit is
mounted horizontally there is one set. Each set contains a primary
mounted horizontally there is one set. Each set contains a primary
drain and a secondary or auxiliary drain. The primary drain is the
drain and a secondary or auxiliary drain. The primary drain is the one
one that is lowest (even with the bottom of the pan). The secondary
that is lowest (even with the bottom of the pan). The secondary drain
drain is at the higher level. They are labeled on the dimensional
is at the higher level. They are labeled on the dimensional drawings
drawings above.
above.
-These units operate with a positive pressure at the drain
-These units operate with a positive pressure at the drain
connections and although a P-trap is not required, it is
connections and although a P-trap is not required, it is
recommended to prevent capacity loss. Always follow local
recommended to prevent capacity loss. Always follow local
codes and standards
codes and standards
-The trap needs to be installed as close to the unit as possible.
-The trap needs to be installed as close to the unit as possible. Make
Make sure the top of the trap is below the connection to the drain
sure the top of the trap is below the connection to the drain pan to
pan to allow complete drainage of the pan.
allow complete drainage of the pan.
-Slope the drain line a minimum of ¼" per foot.
-Slope the drain line a minimum of ¼" per foot.
-Do not reduce the pipe size from ¾", this could cause premature
-Do not reduce the pipe size from ¾", this could cause premature
blockage in the lines
-Do not braze near the plastic drain piping blockage in the lines
-Do not braze near the plastic drain piping
2" Min.
2" Min.
Note:
Horizontal runs must also have an anti-siphon air vent
(standpipe) install ahead of the horizontal run to eliminate air trapping.
Horizontal drain lines must be pitched a minimum ¼" per foot.
Route the drain lines outside or to an appropriate drain. Drain lines
must be installed so they do not block service access to the front of
sure the top of the trap is below the connection to the drain pan to
allow complete drainage of the pan.
-Slope the drain line a minimum of ¼" per foot.
-Do not reduce the pipe size from ¾", this could cause premature
blockage in the lines
-Do not braze near the plastic drain piping
Note:
(standpipe) install ahead of the horizontal run to eliminate air
Note:
trapping. Horizontal drain lines must be pitched a minimum ¼" per
(standpipe) install ahead of the horizontal run to eliminate air trapping.
foot.
Horizontal drain lines must be pitched a minimum ¼" per foot.
Route the drain lines outside or to an appropriate drain. Drain lines
Route the drain lines outside or to an appropriate drain. Drain lines
must be installed so they do not block service access to the front
must be installed so they do not block service access to the front of
of the unit. 24" clearance in the front is for routine maintenance or
the unit. 24" clearance in the front is for routine maintenance or
service.
service.
Note:
Note:
existing drainage system.
existing drainage system.
Insulate the drain lines where sweating could cause water damage.
Insulate the drain lines where sweating could cause water damage.
Upon completion of installation, it is the responsibility of the installer
Upon completion of installation, it is the responsibility of the
to ensure the drain pan(s) captures all condensate, and all
installer to ensure the drain pan(s) captures all condensate, and all
condensate is draining properly and not getting into the
condensate is draining properly and not getting into the ductwork/
ductwork/system.
system.
Vertical Mounting:
When mounted vertically, the air handler's primary drain connection
is located in the center of the unit. The slightly higher drain to the
PA79D202H01
left is the secondary drain.
Attach the drain connector and tighten TO THE PROPER TORQUE
SHOWN PREVIOUSLY with sealant and install the drain line.
IMPORTANT!
Over-tightening the drain connection could result in drain pan
breakage and failure.
The secondary connection should be connected to a separate
drainage system. Run the secondary drain so the occupants will be
able to notice water flowing through the secondary drain indicating
a blockage in the primary drain. Optional use for the secondary is a
primary drain line overflow switch (provided by others). This device
will shut the cooling operation unit down in the event of a primary
drain line blockage. See wiring section for connecting this device.
Horizontal (Left or Right):
If the unit is installed horizontally, remove the knockout in the front
2" Min.
panel to gain access to the side drain pan connections. Attach the
Anti-syphon
connector as described above and route drain line. Any vertical
air vent
drain pan openings must be covered to eliminate air loss which will
decrease the capacity of the unit.
IMPORTANT!
Over-tightening the drain connection could result in drain pan
breakage and failure.
The secondary connection should be connected to a separate
Vent T
drainage system. Run the secondary drain so the occupants will be
Drain Trap
able to notice water flowing through the secondary drain indicating
a blockage in the primary drain. Optional use for the secondary is a
primary drain line overflow switch (provided by others). This device
will shut the cooling operation unit down in the event of a primary
drain line blockage. See wiring section for connecting this device.
2" Min.
Vertical Mounting:
2" Min.
When mounted vertically, the air handler's primary drain
connection is located in the center of the unit. The slightly higher
drain to the left is the secondary drain.
Attach the drain connector TO THE PROPER TORQUE SHOWN
Horizontal runs must also have an anti-siphon air vent
ABOVE with sealant and install the drain line.
Horizontal runs must also have an anti-siphon air vent
IMPORTANT!
Over-tightening the drain connection could result in drain pa
breakage and failure.
The secondary connection should be connected to a separate
drainage system. Run the secondary drain so the occupants will
be able to notice water flowing through the secondary drain
Check local codes before connecting the drain line to an
indicating a blockage in the primary drain. Optional use for the
Check local codes before connecting the drain line to an
secondary is a primary drain line overflow switch (provided by
others). This device will shut the cooling operation unit down in th
event of a primary drain line blockage. See wiring section for
connecting this device.
Horizontal (Left or Right):
If the unit is installed horizontally, remove the knockout in the fron
panel to gain access to the side drain pan connections. Attach th
connector as described above and route drain line. Any vertical
drain pan openings must be covered to eliminate air loss which w
decrease the capacity of the unit.
IMPORTANT!
Over-tightening the drain connection could result in drain pa
breakage and failure.
The secondary connection should be connected to a separate
drainage system. Run the secondary drain so the occupants will
be able to notice water flowing through the secondary drain
indicating a blockage in the primary drain. Optional use for the
secondary is a primary drain line overflow switch (provided by
others). This device will shut the cooling operation unit down in th
event of a primary drain line blockage. See wiring section for
connecting this device.
14. Electrical Wiring
Warning:
Electrical work should be done by a qualified electrical
contractor in accordance with "Engineering Standards fo
Electrical Installation" and supplied installation manuals
If the power circuit lacks capacity or has an installation
failure, it may cause a risk of electrical shock or fire.
− Be sure to follow local and national code requirements
when wiring these units
− Install the unit in a manner to prevent that any of the
control circuit cables (remote controller, transmission
cables) are brought in direct contact with the power cab
outside the unit.
− Ensure that there is no tension on any wire connections
− Some cables (power, remote controller or transmission
2" Min.
Anti-syphon
air vent
Vent T
Drain Trap
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