Trane RT-SVX10C-EN Heavy Objects, Pitch Pocket Location, Installation Unit Rigging & Placement

Trane's Engineering Bulletin RT-EB-80 provides additional information concerning duct design and sound reduction.

Pitch Pocket Location

The location of the main supply power entry for S_HF 20 through 75 Ton rooftop units is located at the bottom right- hand corner of the control panel. Figures 3-2A, B & C illus- trate the location for the electrical entrance through the base in order to enter the control panel. If the power supply conduit penetrates the building’s roof beneath this opening, it is recommended that a pitch pocket be installed before the unit is placed onto the roof curb. The center line dimen- sions shown in the illustration below indicates the center line of the electrical access hole in the unit base when it is positioned on the curb, ±3/8 inch. The actual diameter of the hole in the roof should be at least 1/2 inch larger than the diameter of the conduit penetrating the roof. This will al- low for the clearance variable between the roof curb rail and the unit base rail illustrated in Figure 3-5.

The pitch pocket dimensions listed are recommended to en- hance the application of roofing pitch after the unit is set into place. The pitch pocket may need to be shifted as illus- trated to prevent interference with the curb pedestal.

Installation (Continued)

Note: If a “built-up” curb is provided by others, keep in mind that these commercial rooftop units do not have base pans in the condenser section.

Note: If this is a REPLACEMENT UNIT keep in mind that the CURRENT DESIGN commerical rooftop unitsdo not have base pans in the condenser section.

Unit Rigging & Placement

WARNING

Heavy Objects!

Do not use cables (chains or slings) except as shown. Each of the cables (chains or slings) used to lift the unit must be capable of supporting the entire weight of the unit. Lifting cables (chains or slings) may not be of the same length. Adjust as necessary for even unit lift. Other lifting arrangements may cause equipment or property-only damage. Failure to properly lift unit may result in death or serious injury. See details below.

Unit	Tonnage	“A” Dimension	"B" Dimension
S*HF	20, 25 & 30	4' 5-9/16"	5-9/16"
S*HF	50 & 55	9' 5-11/16"	5-1/2"
S*HF	40, 60, 70 & 75	6' 9-5/8"	7-3/16"

* = All unit functions (SAHF, SEHF, SFHF, SSHF, SLHF and SXHF)

If a Trane Curb Accessory Kit is not used:

a. The ductwork can be attached directly to the factory-provided flanges around the unit’s supply and return air openings. Be sure to use flexible duct connections at the unit.

b. For “built-up” curbs supplied by others, gaskets must be installed around the curb perimeter flange and the supply and return air opening flanges.

Note: Use spreader bars as shown in the diagram. Refer to the Installation manual or nameplate for the unit weight.Refer to the Installation Instructions located inside the side control panel for further rigging information.

1.A Center-of-Gravity illustration and the dimensional data is shown in Figure 3-3.

2.Attach adequate strength lifting slings to all four lifting lugs on 20 through 75 Ton units and to all six lifting lugs on 90 through 130 Ton units. The minimum distance be- tween the lifting hook and the top of the unit should be 7 feet for 20 through 75 Ton units and 12 feet for 90 through 130 Ton units. Figure 3-4 illustrates the installa- tion of spreader bars to protect the unit and to facilitate a uniform lift. Table 3-3 list the typical unit operating weights.

3.Test-lift the unit to ensure it is properly rigged and bal- anced, make any necessary rigging adjustments.

4.Lift the unit and position it over the curb and pedestal. (These units have a continuous base rail around the air handler section which matches the curb.

5.Align the base rail of the unit’s air handler section with the curb rail while lowering the unit onto the curb. Make sure that the gasket on the curb is not damaged while positioning the unit. (The pedestal simply supports the unit’s condenser section)

A cross section of the juncture between the unit and the roof curb is shown in Figure 3-5.

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