This is necessary for unit drain to function properly.

Unit leveling tolerances are shown in Fig. Improperly applied gasket can also result in air leaks and poor unit performance.Ĭurb should be level. Install gasket supplied with the roof curb as shown in Fig. IMPORTANT: The gasketing of the unit to the roof curb is critical for a watertight seal. Connection plates must be installed before unit is set in roof curb. If gas, electric power or control power is to be routed through the curb, attach the accessory thru-the-curb service connection plates to the roof curb in accordance with the accessory installation instructions. Install insulation, cant strips, roofing felt, and counter flashing as shown. ROOF CURB - Assemble and install accessory roof curb in accordance with instructions shipped with curb. Seals around duct openings must be tight. Using the same screws, install covers on vertical duct openings with the insulation side down. To convert to horizontal configuration, remove screws from side duct opening covers and remove covers. Unit is shipped in the vertical discharge configuration. Electrical shock could cause personal injury. When pressure testing field-supplied gas piping at pressures of 3.4 kPa ( 1/ 2 psig) or less, a unit connected to such piping must be isolated by manually closing the gas valve(s).īefore performing service or maintenance operations on unit, turn off main power switch to unit. If gas valve is ever subjected to pressure greater than 3.4 kPa ( 1/ 2 psig), it must be replaced before use. Pressures greater than 3.4 kPa ( 1/ 2 psig) will cause gas valve damage resulting in hazardous condition. Have fire extinguishers available for all brazing operations.ĭisconnect gas piping from unit when leak testing at pressure greater than 3.4 kPa ( 1/ 2 psig). Use quenching cloth for unbrazing operations. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.įollow all safety codes. All other operations should be performed by trained service personnel. Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Step 8 - Adjust Factory-Installed Options.

Carrier manual outside air damper