2420 38TH ST ROYELL MANUFACTURING 2025-03-27

Table 7. Unit Wei hts Unit Size Model 030 045 060 075 100 125 1 150 `1 175 200 225 250 300` 350 400 Pounds(kg) UBX 84 89102 108 168 171 300 320 320 385 400 458 494 506 (38 40) (46) (49) 76 78 136 145 145 175 (181) (208) 224 230 UBZ 85 90 103 i09 169 172 301 321 321 386 401 459 495 507 39) 41 47 (49 (77 78 (137) (146) (146) (175 182 208 (225) (230 UDX 57 62 71 76 101 106 178 193 193 211 223 277 303 316 26 (28) (32) (34 46A8 81 88 88 (96) (101) (1 26J.. 137 143 UDZ 58 63 71 77 102 107 179 194 194 212 224 278 304 317 26 29 (32 (35) (46) (49) (81) 1 (88) (88 96 102 126 138 144 Combustion Air Requirements 0 WARNING • Do not install a unit in a confined space without providing wall openings leading to and from the space. • Unit heater models UBX and UDX are designed to take combustion air from the space in which the unit is installed and are not designed for connection to outside combustion air intake ducts. Connecting outside air ducts voids the warranty and could cause hazardous operation. • For UBZ and UDZ models, refer to the combustion air requirements in the venting instructions listed in 'Cable 1. • UBX and UDX models must be supplied with the air that enters into the combustion process and is then vented to the outdoors. Sufficient air must enter the equipment location to replace that which is exhausted through the heater vent system. • In the past,the infiltration of outside air assumed in heat loss calculations(one air change per hour)was assumed to be sufficient.However,current construction methods,which use more insulation,vapor barriers,tighter fitting and gasketed doors and windows,weather-stripping,and/or mechanical exhaust fans,may now require the introduction of outside air through wall openings or ducts. • Under all conditions, enough air must be provided to ensure there will not be a negative pressure condition within the equipment room or space. • Requirements for combustion air and ventilation air depend upon whether the unit is located in a confined or unconfined space. A confinedspace is defined as a space whose volume is<50 cubic feet per 1,000 BTUh of the installed appliance input rating. An unconfined space is defined as a space whose volume is>50 cubic feet per 1,000 BTUh of the installed appliance input rating. • For confined space installation of UBX and UDX models (including those with CV option), provide openings (depending on the combustion air source)near the floor and ceiling for ventilation and air for combustion,as shown in Figure 4 and as listed in Table 8. NOTE: For further details on supplying combustion air to a confined space, refer to the National Fuel Gas Code ANSI 2223.1 a (latest edition). C A ` --___B-__ _ ` CONFINER SPACE C A B_ __ \ blmnmimmm Figure 4. Confined Space Combustion Air Openings(Refer to Table 8) 1-UBX-UBZ-UDX-UDZ(04-21)1034344-0 11