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manual abstract
It is available with either of two factory-installed direct expansion coils (Model 180R- or 240R-379) or with no expansion coil as Model 450-379H. Model 180R units are equipped for use with R22 refrigerant and provide 180,000-Btuh cooling when connected with a Bryant Model 180-566 Condensing Unit. Model 240R units are equipped for use with R500 refrigerant and provide 240,000-Btuh cooling when connected with a Bryant Model 240-566 Condensing Unit. All three models have a heating input of 450.000 Btuh (approximately) for both natural and propane gas. They are equipped with a two-stage firing arrangement for operation at a reduced input of 225.000 Btuh. ; .FI L DO NOT! REMOVE Important-Read Before Installing Bè sure the available gas supply is the same as that shown on the American Gas Association (A.G.A.) rating plate. Check the electrical supply to be sure that voltage, frequency, and phase correspond to that specified on the unit rating plate. Check all national, state, and local building codes affecting the installation of this unit. Check all local ordinances that could affect the installation of this type equipment. WARNING: All access panels must be in place at all times when unit is in operation. GENERAL The design of the unit is certified by the American Gas Association (A.G.A.) for use with riatural or propane gas with the appropriate controls and orifices. The units are designed specifically for outdoor installation, either at rooftop or ground level. Installation of the unit consists of the following: I. Locating the Unit II. Gas Piping III. Duct Connection IV. Venting V. Coil Connection (Models 180R- and 240R-379H) VI. Electrical Connections VII. Start-up and Adjustments VIII. Maintenance Figure 1 SECTION I. LOCATING THE UNIT Extreme caution should be observed to prevent damage when moving the unit. Maintain the unit in an upright position at all times during rigging and moving operations. To facilitate lifting and moving operations, place the unit in an adequate rope or cable sling. CAUTION: Protect the top and sides of the unit from possible damage from rigging sling. Rooftop Installation Level the unit on a base situated a minimum of 6 inches above the roof to insure proper drainage. Consult local and state building codes for installation requirements. Be assured the roof construction will support the weight of the equipment. Ground Level Installation The unit should be placed on a level concrete slab (4-inch minimum thickness); level the unit on the slab with 1-inch clearance to insure proper drainage. Combustible Clearances Minimum clearances are: 6 inches from rear or duct side, 24 inches on all other sides, and 0 inch on the bottom. These clearances permit the use of combustible materials for supports. The top of the unit must be kept clear at all times. -.681- -76f- 3 E UNIT SIZE CONNECTION SIZE (COIL) A B c D 7/8 OD (Suction)* 2 ea 6-3/16 14-13/16 180R-379H 5/8 OD (Liquid)* 2 ea 10-3/16 18-13/16 1-3/8 OD (Suction) 2 ea 7-3/16 12-5/8 240R-379H 5/8 OD (Liquid) 2 ea 10-3/16 18-1/2 *Refer to condensing unit for compressor suction and liquid line sizes Approximate Shipping Weights 450-379H—1425 lbs 180R-379H—1460 lbs 240R-379H—1565 lbs ^4 Figure 2-Dimensional Drawing ■jFCRT. DRAIN CONN.-(OPPOSITE SIDE) A69420 TABLE I- Ratings and Capacities • Model 450-, 180R-, & 240R-379H Heating Input, 1st Stage Btuh 225,000 Heating Output, 1st Stage Btuh 166,000 Heating Input, 1st & 2nd Stages Btuh 450,000 Heating Output, 1st & 2nd Stages Btuh 337,000 Approved Temp Rise °F 20-75 CFM 0.5 inch wc S.P. 6,000 Blower Motor HP 3 Power Supply 208-60-3 230-60-3 Full Load Current Amps 8.4 8.4 Locked Rotor Current Amps 58.2 53.0 Speed RPM 3450 Frame Size 56 Branch Circuit Wire Size Min* AWG No. 14 14 Branch Circuit Fuse Size Max Amps 25 25 Filters Size (450-379H) (6) 16x25x1 (180R & 240R) (3) 16x25x1 (3) 20x25x1 *If aluminum conductors are to be used, the connections must be made in accordance with the National Electric Code. The wire size selected must have a current capacity not less than that of the copper wire specified and must not create a voltage drop between the service panel and the unit in excess of 2% of the unit rated voltage. 39379D35 -2- SECTION II. GAS PIPING SECTION IV. VENTING A separate gas supply line should be installed to run directly from the meter to the heating section. Check your local utility for recommendations concerning existing lines. Choose a supply pipe large enough to keep the pressure loss as low as practical. Never use pipe smaller than the gas connection to the heating section. Observe local codes for all gas pipe installations. The following are pertinent recommendations: 1. Avoid low spots in long runs of pipe. It is best to grade all pipe 1/4 inch in every 15 feet to prevent traps. All horizontal runs should grade downward to risers. Risers should be used to connect to heating section ...