Trane PKG-SVX17A-EN manual Installation, Clearances, Unit Mounting, Roof Mounted Unit

Installation

Clearances

Provide enough space around the unit to allow unrestricted access to all ser- vice points. Refer to Figure 1 through Figure 4 for unit dimensions and mini- mum required service and free air clearances. Observe the following points to insure proper unit operation.

A. Do not install the unit under a low overhang. Condenser discharge must not be restricted. See Notes in Figure 1 through Figure 4.

NOTICE: Do not obstruct condenser discharge air. This can result in warm air recirculation through the coil.

B. Do not locate the unit in a position where runoff water can fall into the fan discharge openings.

C. Condenser intake air is supplied from three or four sides of the unit. Adhere to the minimum required clearances given in Figure 1 through Figure 4.

Unit Mounting

Rooftop Mounting: If the unit will be roof mounted, determine for certain that the structure is strong enough to support the unit and any required accessories. Unit weights are given in Table 2. The unit should be elevated on a level, field fabricated four-inch steel or wood 4" x 4" mounting frame. Complete the frame and secure it into position before lifting the unit to the roof. The mounting frame must sup- port a minimum of three of the unit’s four sides and should span roof sup- ports to distribute the load on the roof.

Figure 5 Roof Mounted Unit

WARNING

Structural Failure!

Ensure that the roof structure supports are strong enough to support the weight of the unit and any accessories. Failure to do this could result in death or seri- ous injury due to structural fail- ure and could seriously damage the unit and the building.

Ground Level Mounting

“For ground level installation, the unit base should be adequately supported and hold the unit near level. The installation must meet the guidelines set forth in local codes.” The support should extend two inches beyond the unit base channels at all points. The unit and support must be isolated from any adjacent structure to prevent possible noise or vibration problems. Any ground level location must com- ply with required clearances given in Figure 1 through Figure 4.

Holes must be made in the structure to run refrigerant lines. For the major- ity of ground-level installations, the holes can be made in the header that rests on top of the foundation. Alter- natively, these holes may also be made in the foundation itself. On roof- mounted units, refrigerant lines should enter the building as close to the unit as possible; preferably within three to four inches of the refrigerant connection on the unit, plus a six-inch (long radius) 90 degree "L" entering the building (See Figure 5).

Refrigerant Piping Guidelines A. Maximum recommended line lengths: (per circuit)

Maximum linear length	200 Ft.
(w/o accumulator)
Maximum discharge line lift	200 Ft.
Maximum liquid line lift	60 Ft.
B. Maximum allowable pressure
drops (R-410A):
Discharge line	10 psi
Liquid line (without subcooler)...	50 psi

Route refrigerant piping for minimum linear length, minimum number of bends and fittings (no reducers) and minimum amount of line exposed to outdoor ambients.

C. Recommended line sizes: CTA090, 120A (single circuit) CTA120B, 180B (dual circuit)

Discharge line - 7/8 inch sealed type L

refrigerant tubing.

Liquid line - 1/2 inch sealed type L refrigerant tubing.

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