Trane Application Considerations for SXHF Air Conditioners

Application Considerations

Figure AC-3 is a simplified sketch showing which panels can be used for horizontal supply and/or return. On 90 to 130 ton units, only one side of the extended casing may be used for horizontal supply because of the location of the unit control panel.There are, however, on SXHF models two panels (Panels A) on the side opposite the control box which can be removed along with the vertical support which separates the two. Removal of the vertical support is optional, but will ensure maximum airflow. On SLHG, SSHG models only one of the Panel A’s may be used for horizontal supply

because of the location of the heating coil. Horizontal return is accomplished in much the same way as on S*HFs by removing the exhaust fan access door (Panel B). SeeTables AC-4 and 5 for S*HG panel dimensions.

When using an IntelliPak® Rooftop for horizontal supply and return, an additional pressure drop must be added to the supply external static to account for the 90 degree turn the air is making. This additional pressure drop depends on airflow and rooftop size, but a range of 0.10 inches to 0.30 inches can be expected.The openings on the rooftop all have a one inch lip around the

perimeter to facilitate ductwork attachment. If exhaust fans are being used on an IntelliPak Rooftop unit with horizontal return, provisions should be made for access to the exhaust components, since the access door opening is now being used as a return. Perhaps the return ductwork attachment to the rooftop can include a section of removable duct. Use the dimensions provided and the supply and exhaust CFM to calculate the velocity (ft/min) through the openings.

Horizontal Discharge SXHG, SLHG, SSHG Rooftops (90 to 130 tons)

The SXHG, SLHG, SSHG rooftops can be field modified to supply and return air

Figure AC-3 — Horizontal Discharge Panel Dimensions — 90 - 130Tonss SXHG, SLHG, SSHG Units

horizontally without the use of a horizontal supply/return curb.

To supply air horizontally, use Panel A only.The Panel on the opposite side cannot be used due to the location of the unit control Panel. SXHG rooftop air conditioners do not have a panel configuration like the 20 to 75 ton rooftops.To achieve maximum airflow, vertical support can be removed after the unit has been placed on the roof curb. It is secured by four screws. (See Note 1) For horizontal discharge on SLHG and SSHG units, only the Panel A next to the condenser fan section can be removed. The other Panel A next to the supply fan cannot be used due to the location of the heating coils.

To return air horizontally, the exhaust fan access door (Panel B) can be removed and used as a return opening.

Note:

1.SXHG units have two Panel A’s that can be removed. Once unit is installed, panel(s) and the 61/2” vertical support channel in between may be removed.

Table AC-4 — SXHG, SLHG, SSHG —

Panel A and B Dimensions

			Total Area (H X W)
Panel	H (in.)	W (in.)	(in.2)	(ft2)
A	72.7	27.5	1999	13.9
B	72.7	34.5	2508	17.4

Notes:

1.Add an extra 0.20-inches pressure drop to the supply external static to account for the extra turn the air is making.

2.The openings all have a 1.25-inch lip around the perimeter to facilitate ductwork attachment.

Table AC-5 — SXHG, SLHG, SSHG —

X,Y and Z Dimensions

Model	X (in.)	Y (in.)	Z (in.)
S*HG 90-130	69.0	77.8	244.7
* = X, L, or S

3.If exhaust fans are being used, provisions should be made for access to the exhaust components, since the access door is now being used as a return.

4.Use the dimensions provided and the supply Cfm to calculate the velocity (ft/min) through the openings to be sure they are acceptable.

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