Installation of Diffusers

General

All units must be installed upright and level as indicated by the arrow on the side of the units. Return air slots should be placed perpendicular and offset to the slot diffusers to avoid short- circuiting of air distribution patterns.

Place the unit in its approximate final position and check that it is upright and level. For single- slot units, engage the back of the diffuser over the t-bar with an edge and both ends resting on the t-bar. For double-slot units, slide the unit over the t-bar. For center- notch units, place diffuser over the t-bar, straddling it across a t-bar and resting on the units ends.

If the unit has a fire damper, make sure that the damper is still fully open. Diffuser discharge must always be flush with the ceiling tiles to assure the proper airflow (Coanda effect).

Diffusers require specific installation information when mounting to a desired ceiling type. Select the ceiling type that closely matches the job site application and use the following procedures.

T-Bar Ceiling

Finish installation of the diffuser in t-bar ceiling. (See Figure 29.) Follow these procedures before the ceiling construc- tion is completed.

1.Position the diffuser at each end resting directly on the structural t-bar for support and the t-bar fitting into the channel provided at the unit discharge air throw.

2.A ceiling tile support flange is provided on each side of the discharge slot of the unit.Trim ceiling tile approximately 1½ inches each to allow for width of discharge slot. For revealed edge ceilings, tile must be cut in a “Z” pattern.

3.Install ceiling tiles in usual manner with cut edges resting on the flanges of the air slot.

Figure 29 – Diffuser Installation inT-Bar Ceiling

Concealed Spline Ceiling

Follow these procedures to finish installation of control and satellite diffusers and concealed spline for suspension ceilings before completing the ceiling construction (Figure 30).

Place the units in their approximate final positions. If using the trim angle diffuser, its slots must be even with the spline level. If applying the trim accessory, the bottom of the diffuser must be level with the finished ceiling.

If installing the trim accessory, insert the trim into the ceiling opening from below and engage the diffuser slot to the trim t-bar structure.With bottom flange of trim accessory against the ceiling, and using the pre-drilled holes in the flange as a guide, drill holes in the flange of the diffuser. Join the diffuser and trim accessory with self-taping sheet metal.

Figure 30 – Diffuser withTrim Accessory Installation in Concealed Spline Ceiling

Drywall/Plaster Ceiling

Finish installation of diffusers in plaster ceiling. Follow these procedures before completing the ceiling construction (Figure 31).

1.Suspend the units above the intended ceiling level and their approximate horizontal positions and finish running flexible ductwork.

2.After drywall and/or plaster is installed, cut openings to receive the diffuser air outlets. Also, allow for access openings to complete installation and service of the unit.

3.Slide the trim accessory up and into the ceiling opening. Using the rim accessory as a template, drill four guide holes in the lip of the diffuser slot. Lower the unit onto the trim frame and attach with the sheet metal screws.

Note:The bottom of the throat section must be parallel to the ceilings for proper air distribution.

CAUTION

Equipment Damage!

Do not install trim frame into ceiling using screws.When diffuser is placed on the trim frames, it will pull out.

Figure 31 – Diffuser withTrim Accessory Installation in Plaster Ceiling

Plaster trim frame attaches with 2–4 tension clips on the side of the diffuser.

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Trane VAV-SVN01E-EN Installation of Diffusers, General, Bar Ceiling, Concealed Spline Ceiling, Drywall/Plaster Ceiling
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VAV-SVN01E-EN, Trane specifications

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