IM 817-4
Page 29 of 60
Ensure refrigerant pressure taps are installed in piping end
compartment for proper charging and setting of the TXV
valve.
1-3/8" Left End
of unit
(Less end panel)
Thermal Expansion
Valve (TXV)
Superheat Adjustment.
Return (Suction Line)
Bulb
attached in the 2 or
10 o'clock position
Equalization Tube
Condensate Drain (Protect Drain Pan with
a quenching cloth when brazing, to prevent
damage).
Supply (Liquid Line)
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.
Wrap TXV valve with a quenching cloth and remove bulb from
suction line to avoid valve damage while brazing.
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.
STOP! Before Brazing
Remove Bulb When
Brazing
To Prevent Overheating
Damage
Use A Quenching Cloth When Brazing, to Prevent Overheating The TXV Valve
Body (Avoid Valve Damage and Erratic Operation)
Figure 86 - TXV Valve Piping Detail (Left Hand Shown)
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.
Piping Stub-up Within Cabinet
Unit End Compartment
Piping Stub-up Within 6" End Panel
End Panel 6"
Application and Dimension
Wall Line
1"
11
5
⁄
8
"
10"
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.
Space available
at left end of unit
for piping stub-up
when 6" end panel
is used.
Left End of unit
(Less end panel)
Wall Line
4"
1"
Unit End Compartment
6"
Figure 85 - Piping Stub-Up Details, 6" End Panel
Install Pressure Taps on Supply (Liquid Line) and Return (Suction
Line) Piping (By Others).
6" End Panel
CAUTION
NOTICE
