Carrier 50TFQ008-012 specifications Unit Leveling Tolerances

MAXIMUM ALLOWABLE

DIFFERENCE (in.)

A-B	B-C	A-C
0.5	1.0	1.0

Fig. 2 — Unit Leveling Tolerances

SLAB MOUNT (Horizontal Units Only) — Provide a level concrete slab that extends a minimum of 6 in. beyond the unit cabinet on all sides. Install a gravel apron in front of the outdoor coil air inlet to prevent grass and foliage from obstruct- ing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

ALTERNATE UNIT SUPPORT — When the curb or adapter cannot be used, support unit with sleeper rails using unit curb or adapter support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.

Step 2 — Field Fabricate Ductwork — On verti- cal discharge units, secure all ducts to the roof curb and building structure. Do not connect ductwork to the unit. For horizontal applications, field-supplied flanges should be attached to horizontal discharge openings and all ductwork attached to the flanges. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accor- dance with applicable codes.

Ducts passing through an unconditioned space must be insulated and covered with a vapor barrier.

If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applica- ble fire codes.

A minimum clearance is not required around ductwork. Cabinet return-air static pressure (a negative condition) should not exceed 0.35 in. wg with economizer, or 0.45 in. wg without economizer.

Step 3 — Install Condensate Drain Line and External Trap — Condensate drain connections are locat- ed at the bottom and end of the unit. Unit discharge connec- tions do not determine the use of drain connections; either drain connection can be used in vertical or horizontal applications.

When using the standard end drain connection, make sure the plug in the alternate bottom connection is tight before in- stalling the unit.

To use the bottom drain connection for a roof curb installa- tion, relocate the factory-installed plug from the bottom connec- tion to the end connection. The center drain plug looks like a star connection, but can be removed with a 1/2-in. socket drive exten- sion. See Fig. 3. The piping for the condensate drain and external trap can be completed after the unit is in place.

All units must have an external trap for condensate drain- age. Install a trap at least 4-in. deep and protect against freeze- up. If drain line is installed downstream from the external trap,

pitch the line away from the unit at 1/4-in. per ft of run. Do not use a pipe size smaller than the unit connection. See Fig. 4.

Step 4 — Rig and Place Unit — Inspect the unit for transportation damage. File any claim with the transportation agency. Keep the unit upright and do not drop it. Spreader bars are not required if top crating is left on the unit. Rollers may be used to move the unit across a roof. Level by using the unit frame as a reference. See Table 1 and Fig. 5 for additional information. Operating weight is shown in Table 1 and Fig. 5.

Lifting holes are provided in the base rails as shown in Fig. 5 and 6. Refer to rigging instructions on the unit.

POSITIONING — Maintain clearance around and above the unit to provide proper airflow and service access. See Fig. 6.

Position the unit on the roof curb so that the following clear- ances are maintained: 1/4-in. clearance between the roof curb and base rails on each side and in front of the unit; 35/16-in. clearance between the roof curb and the outdoor fan end of the unit (see Fig. 1, section C-C).

Do not install the unit indoors. Do not locate the unit air inlet near exhaust vents or other sources of contaminated air.

Although the unit is weatherproof, guard against water from higher level runoff and overhangs.

After the unit is in position, remove the polyethylene ship- ping wrapper and rigging skid.

HORIZONTAL	DRAIN PLUG
DRAIN OUTLET

NOTE: Drain plug is shown in factory-installed position.

Fig. 3 — Condensate Drain Pan (Side View)

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4-in. trap is recommended.

Fig. 4 — Condensate Drain Piping Details

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