Condensate Piping; Direct Expansion (Dx) R-22 Piping - Daikin AVS Installation Manual

Figure 85 - Piping Stub-Up Details, 6" End Panel
Piping Stub-up Within Cabinet
Unit End Compartment
Wall Line
1"
⁄ "
11 5
8
Note: Space available in left
end compartment for piping
stub-up. Stub-up, including
unions and shutoff valves,
must disconnect below floor
line for unit installation and
removal.

Condensate piping:

Daikin cooling unit ventilators are designed for condensate removal
into a condensate disposal system. Do not connect the unit drain
connection so that condensate exits to the outside and/or is exposed to
freezing temperatures. Installer is responsible for any damage that
might be caused from freezing condensate. In applications with an
end compartment auxiliary drain pan, see the installation instructions
shipped with the auxiliary drain pan itself.
Direct-Expansion (DX) R-22 Piping
DX coils have O.D. sweat connections. Interconnecting tubing is
field-supplied. See Table 21, page 31 and job-specific drawings for
correct tubing sizes.
CAUTION
Wrap TXV valve with a quenching cloth and remove bulb from
suction line to avoid valve damage while brazing.
Proper ventilation is required for brazing. When brazing, be sure to
protect unit ventilator components from overheating damage (melting
insulation, also damage to valves, wiring, electronics, sensors, etc.).
During brazing, bleed nitrogen through the piping. Using field-supplied
material suitable for insulating refrigerant lines, wrap the thermal
expansion valve (TXV) bulb and the piping between the TXV and
the point where it enters the coil with at least one thickness of the
material. Likewise, insulate the suction line. (See figures 87-90 for
typical piping and wiring)
Ensure proper insulation of supply and return piping. Proper insulation
prevents loss of unit ventilator capacity, overheating of end compartment,
and / or moisture dripping.
NOTICE
Ensure refrigerant pressure taps are installed in piping end
compartment for proper charging and setting of the TXV
valve.
IM 817-4
Piping Stub-up Within 6" End Panel
Wall Line
1"
10"
Space available
at left end of unit
1-3/8" Left End
for piping stub-up
when 6" end panel
of unit
(Less end panel)
is used.
Unit End Compartment
4"
Left End of unit
(Less end panel)
Figure 86 - TXV Valve Piping Detail (Left Hand Shown)
STOP! Before Brazing
Use A Quenching Cloth When Brazing, to Prevent Overheating The TXV Valve
Body (Avoid Valve Damage and Erratic Operation)
Thermal Expansion
Valve (TXV)
Superheat Adjustment.
Install Pressure Taps on Supply (Liquid Line) and Return (Suction
Line) Piping (By Others).
End Panel 6"
Application and Dimension
6"
6" End Panel
Equalization Tube
Return (Suction Line)
Remove Bulb When
Brazing
To Prevent Overheating
Damage
Bulb
attached in the 2 or
10 o'clock position
Supply (Liquid Line)
Condensate Drain (Protect Drain Pan with
a quenching cloth when brazing, to prevent
damage).
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