Make Piping Connections; Water Coil Connections - Daikin ARQ Installation 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 possibility 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
appropriate 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
improper unit operation and coil freeze-ups.
NOTICE
Use piping shut off valves and connection unions for future
servicing 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.
Page 22 of 42 Self-Contained WSHP Unit Ventilator Models ARQ, ERQ, GRQ

Water Coil Connections

Hook up water piping in accordance with Figure 38.
Figure 38: Water Supply and Return Connections (Unit
Size 040 & 048 Shown)
Figure 39: 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
Water Return
3/4" FPT Fitting
Water Supply
3/4" FPT Fitting
IM 1083