Make Piping Connections; Water Coil Connections - Daikin ARQ Installation And Maintenance Manual

Make Piping Connections

CAUTION
Be sure the hot and chilled water supply and return system are
thoroughly flushed and cleaned before connecting piping to the
unit ventilator. Debris in the lines can damage the unit. See "Water
System Cleaning".
For All Systems
Be sure to install the control valve(s) on the correct unit
ventilator. Indiscriminate mixing of valves in the field can result
in valves improperly sized for the desired flow rate, which can
result in poor operation and coil freezeups. Install control valve
so there is at least 2" (51mm) minimum clearance to remove
the actuator from the valve body.
Be certain that the control valve is installed correctly, with its
orientation vertical. Valves should be installed at least 5° off
center.
CAUTION
Be certain that the control valves are installed with the proper port
orientation to provide proper flow and fail safe operation. Incorrect
installation can result in improper unit operation, and/or the pos-
sibility of coil freeze-up.
With future servicing considerations in mind, use standard, field-
supplied shutoff valves and union connections; this permits easy
removal of the coil or control valve if servicing is required.
WARNING
While brazing, have an extinguisher readily available. Wear ap-
propriate eye and hand protection. Ensure all areas with shared
ventilation have ample fresh air ventilation.
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.).
Ensure proper insulation of supply and return piping. Proper
insulation prevents loss of unit ventilator capacity, overheating
of end compartment, and / or moisture dripping.
The piping to and from the unit must be protected from outside
air and freeze conditions. The piping must be suitably insulated
for condensation or heat lose or gain. Penetrations entering the
unit end compartments must be fitted/sealed for unit integrity.
CAUTION
Failure to install water piping to coils properly can result in im-
proper unit operation and coil freeze-ups.
NOTICE
Use piping shut off valves and connection unions for future ser-
vicing to the coil supply and return stubs, instead of hard piping.
This permits easy removal of the coil or control valve if servicing
is required.
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Water Coil Connections

Hook up water piping in accordance with Figure 35.
Figure 35: Water supply and return connections (unit size
040 & 048 shown)
Figure 36: Typical piping through the floor, inside cabinet
(unit size 024 shown)
Heat
Exchanger
Coil
Flexible Return
Hose with Flow
Controller/Ball
Valve
Flexible Supply
Hose with
Y-Strainer/Ball
Valve
21
Water Return 3/4"
FPT Fitting
Water Supply
3/4" FPT Fitting
IM 1083-3