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manual abstract
Unit leveling tolerances is ± 1/16 in. per linear ft in any direction. Refer to Accessory Roof Curb Installation Instructions for additional information as required. B. Alternate Unit Support When the curb cannot be used, support unit with sleepers using unit curb support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side. II. STEP 2 — RIG AND PLACE UNIT Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable damage. Rollers may be used to move unit across a roof. Level by using unit frame as a reference; leveling tolerance is ± 1/16 in. per linear ft in any direction. See Fig. 1 for additional leveling tolerance information. Unit weight is shown in Table 1. Four lifting holes are provided in ends of unit base rails as shown in Fig. 3. Refer to rigging instructions on unit. A. Positioning Provide clearance around and above unit for airflow, safety, and service access (Fig. 4 and 5). Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air. Although unit is weatherproof, guard against water from higher level runoff and overhangs. B. Roof Mount Check building codes for weight distribution requirements. III. STEP 3 — FIELD FABRICATE DUCTWORK Secure all ducts to building structure. Use flexible duct connectors between unit and ducts as required. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with applicable codes. Ducts passing through an unconditioned space must be insu lated and covered with a vapor barrier. The 542J units with electric heat require a 1-in. clearance for the first 24 in. of ductwork. information required to field fabricate a roof curb are shown —2— Fig. 1 — Roof Curb Details PKG. NO. REF. CURB HEIGHT DESCRIPTION CRRFCURB010A00 1.-2. (305) Standard Curb 14. High CRRFCURB011A00 2.-0. (610) Standard Curbfor Units Requiring High Installation CRRFCURB012A00 2.-0. (610) Side Supply and Return Curb for High Installation NOTES: 1. Roof curb accessory is shipped disassembled. 2. Insulated panels: 1. thick neoprene coated 11/2 lb density. 3. Dimensions in ( ) are in millimeters. 4. Direction of airflow. 5. Roof curb: 16 ga. (VA03-56) stl. 6. A 90 degree elbow must be installed on the supply ductwork below the unit discharge for units equipped with electric heaters. 7. To prevent the hazard of stagnant water build-up in the drain pan of the indoor section, unit can only be pitched as shown. DIMENSIONS (degrees and inches)* UNIT A B Deg. in. Deg. in. ALL .28 .45 .28 .43 NOTE: CRRFCURB013A00 is a fully factory preassembled horizontal adapter and includes an insulated transition duct. The pressure drop through the adapter curb is negligible. For horizontal return applications: The power exhaust and barometric relief dampers must be installed in the return air duct. FULLY INSULATED SUPPLY PLENUM 23" 14 3/4" 6" 3 1/2" 1" INSULATION 1 1/2 # DENSITY, STICK PINNED & GLUED 2" X 1/4 SUPPORT TYP. STITCH WELDED 12" WIDE STANDING SEAM PANELS ACCESSORY CURB DESCRIPTION PACKAGE NO. HEIGHT 1.-11. Pre-Assembled, Horizontal CRRFCURB013A00 (584) Adapter Roof Curb Fig. 2 — Horizontal Supply/Return Adapter Installation UNIT 542J MAXIMUM SHIPPING WEIGHT DIMENSION A lb kg ft-in. mm 150 1895 860 3-1 948 180 2205 1000 3-6 1059 NOTES: 1. Dimensions in ( ) are in millimeters. 2. Refer to Table 1 for unit operating weights. 3. Remove boards at ends of unit and runners prior to rigging. 4. Rig by inserting hooks into unit base rails as shown. Use corner post from packaging to protect coil from damage. Use bumper boards for spreader bars. 5. Weights do not include optional EconoMi$erIV. See Table 1 for EconoMi$erIV weight. 6. Weights given are for aluminum indoor coil plate fins and copper outdoor coil plate fins. Weights of other metal combinations are listed in Table 1. CAUTION: All panels must be in place when rigging. Fig. 3 — Rigging Details Outlet grilles must not lie directly below unit discharge. NOTE: A 90-degree elbow must be provided in the ductwork to comply with UL (Underwriters Laboratories) codes for use with electric heat. WARNING: For vertical supply and return units, tools or parts could drop into ductwork and cause an injury. Install a 90-degree turn in the return ductwork between the unit and the conditioned space. If a 90-degree elbow cannot be installed, then a grille of sufficient strength and density should be installed to prevent objects from falling into the conditioned space. Due to electric heater, supply duct will require 90-degree elbow. IV. STEP 4 — MAKE UNIT DUCT CONNECTIONS Unit is shipped for thru-the-bottom duct connections. Duct- work openings are shown in Fig. 6. Field-fabricated concentric ductwork may be connected as shown in Fig. 7 and 8. Attach all ductwork to ro...