Duct Connections; Water Coil Connections; General Wiring Recommendations - Distech Controls Smart Air Control Valve Installation Manual

Duct Connections

It is recommended that all SACV units be provided with a minimum of:
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3-duct diameters of straight duct prior to the inlet of the unit, and
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3-duct diameters of straight duct from the discharge of the units prior to any take-offs or transitions.
The Smart Air Control Valve is designed for low-pressure and low-velocity operation under 2"WC of inlet static pressure. Appropriate
measures should be taken to reduce the operating static pressure when this is above 2"WC.
After all connections have been made, ensure that the entire ductwork system is airtight. In some high pressure systems, duct sealer may be necessary.
Provide insulation around the entire unit.
Use caution when making ductwork connections or insulating so as not to damage the flow tubes.
Cut "slits" in the insulation for the flow tubes and secure with duct tape.
If the unit is to be installed in a location with high humidity, external insulation around the heating coil should be installed as required.

Water Coil Connections

Water coil piping connections are 7/8" in diameter.
Always connect the inlet piping to the bottom connection of the coil regardless of handling.
Carefully support the water coil piping connections while connecting the adjoining pipe. Drain bids are available to collect any water drip from the coils.
It is recommended that piping to the water coil be done after field-mounted controls, external insulation, and ductwork connections have been completed.
Do not connect water valve or pipe extensions to the water coil connections unless supported.

General Wiring Recommendations

Risk of Electric Shock: Turn off power before any kind of servicing to avoid electric shock.
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All wiring must comply with electrical wiring diagrams as well as national and local electrical codes.
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To connect the wiring to the controller, use the terminal connectors. Use a small flat screwdriver to tighten the terminal connector screws once the
wires have been inserted (strip length: 0.25'' (6 mm), maximum tightening torque 0,4 Nm (3.45 in-lb)).
£ Comply with all network and power supply guidelines outlined in the Network Guide.
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Keep wiring separate according to their function and purpose to avoid any ambient noise transmission to other wires. Use strapping to keep these
wires separated. For example, keep power, hazardous voltage, SELV, PELV, network, and input wiring separate from each other.
£ Power cables must be between 18 and 14 gauge (0.82 to 2.1mm
clamping cage (pole), the wire must be between 22 and 14 gauge (0.33 and 2.1mm
troller's terminal block clamping cage, both wires must be the same thickness, both wires must be between 22 and 16 gauge (0.33 to 1.3mm
sectional area), and both wires must be of the same type (solid or stranded). Twist the wires together and insert then into the controller's terminal
block clamping cage. For any other wiring combination (mixed wire thickness, mixed solid and stranded conductors, more than three wires, wire
thickness is out of range), twist the wires together and use a wire nut and a pig tail to connect to the controller's terminal block connector as show
below.
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Keep input and output wiring in conduits, trays or close to the building frame if possible.
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Always use unshielded cabling with a minimum Category 5 (CAT5) cable for ethernet communications.
£ Do not connect the universal inputs, analog/digital outputs or common terminals to earth or chassis ground (unless stated otherwise and/or using
shielded Ethernet cable).
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Wire Nuts
Pigtails
Terminal Block
Connector
Controller
Figure 4: Using a Wire Nut and Pigtail to Wire the Controller
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cross-sectional area). When connecting one wire to a controller's terminal block
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cross-sectional area). When connecting two wires to a con-
Wire Connections
2
cross-