2525 W CASINO RD BASE FILE 2025-01-03

installation SPECIAL PRECAUTIONS 1.Disconnect power supply before making wiring connections 13.Do not locate unit closer to combustible materials than 6 to prevent electrical shock and equipment damage.All units inches to top and flue pipe,18 inches to sides,and 12 inches must be wired strictly in accordance with wiring diagram fur- to bottom. nished with the unit. 14.Allow at least 6"clearance at the sides and 12"clearance at 2.Turn off all gas before installing unit heaters. rear to provide ample air for combustion and proper opera- 3.Gas pressure to unit heater controls must never exceed 14" tion of fan. W.C. 15.The minimum distance from combustible material is based Testing Piping System.The appliance and its individual shutoff on the combustible material surface not exceeding 160°F. Clearance from the top of the unit may be required to be valve must be disconnected from the gas supply piping sys- greater than 6"if heat damage,other than fire,may occur to tem during any pressure testing if the test pressure is in excess materials above the unit heater at the temperature described. of 1/2 psi. The appliance must be isolated from the gas supply piping 16.Do not install units below 7 feet measured from the bottom system by closing its individual manual shuoff valve during of the unit to the floor. any pressure testing of the gas supply system at test pres- 17.Modine unit heaters are designed to be used for heating sures equal to or less than'/z psi. applications with ambient temperatures between 320F and 4.Check the gas supply pressure at the unit upstream from 90°F. If an application exists where ambient temperaturescan be expected to fall outside of this range,contact factory the pressure regulator.For the purpose of input adjustment, for recommendations. the minimum supply pressure should be 6"W.C.on natural gas or 11"W.C. on propane.The maximum inlet pressure 18.Provide clearance for opening hinged bottom for servicing. on natural gas should be 7"W.C.and 14"W.C.on propane. See Figure 2. Do not set unit on its bottom. Supply pressure with any gas must never exceed 14"W.C.; 19.To assure that the flames do not impinge on heat exchanger if so,install an additional pressure regulator upstream of the surfaces,the unit must be suspended in a vertical and level combination gas valve.Purging of air from gas lines,piping, position. Failure to suspend unit properly may shorten the and lighting the pilot should be performed as described in life of the unit heater. ANSI Z223.1 -Latest Edition National Fuel Gas Code(CAN/ CGA-B149 in Canada). 20. Do not lift unit heater by gas controls or gas manifold. 5. All units must be vented to the outside atmosphere. See 21.Be sure no obstructions block air intake and discharge of page 4 for proper venting instructions. unit heater. 6. Gas-fired heating equipment which has been improperly vented, 22.Do not attach duct wok, air filters, or polytubes to any pro- or which experiences a block vent condition may have flue peller(PA/PAE) model unit heaters. gases accidently spilled into the heated space.See page 20 23.In aircraft hangars, keep the bottom of the unit at least 10' for specific information about the blocked vent safety switch from the highest surface of the wings or engine enclosure of supplied on the unit. the highest aircraft housed in the hangar and in accordance 7. Do not install in potentially explosive or flammable atmo- with the requirements of the enforcing authority and/or NFPA spheres laden with grain dust,sawdust,or similar air-borne No.409, Latest Edition. materials.In such applications a blower type heater installed 24.In garages or other sections of aircraft hangers such as of- in a separate room with ducting to the dust-laden room is fices and shopswhich communicate with areas used forservicing recommended. or storage,keep the bottom of the unit at least 7'above the 8.Installation of units in high humidity or salt water atmospheres floor. In public garages,the unit must be installed in accor- will cause accelerated corrosion resulting in a reduction of dance with the Standard for Parking Structures NFPA No. the normal life span of the units. 88A and the Standard for Repair Garages NFPA No. 88B. 9.To prevent premature heat exchanger failure at In Canada, installation of unit heaters in airplane hangars not locate must be in accordance with the requirements of the enforc- ANY gas-fired unit in areas where chlorinated, haloge- ing authority and in public garages, in accordance with the Hated or acid vapors are present in the atmosphere. current CAN/CGA-B149 codes. 10.Avoid installing units in extremely drafty locations.Drafts can cause burner flames to impinge on heat exchangers which 25.Consult piping,electrical,and venting instructions in this manual shortens life.Maintain separation between units so discharge before installation. from one unit will not be directed into the inlet of another. 26.All literature shipped with your unit should be kept for future 11.Do not locate units in tightly sealed rooms or small compart- use for servicing or service diagnosis. Do not discard any ments without provision for adequate combustion air and literature shipped with your unit. venting. Combustion air must have access to the confined space through a minimum of two permanent openings in the enclosure,one near the bottom.They should provide a free area of one square inch per 1000 BTU per hour input rating of the unit with a minimum of 100 square inches for each opening,whichever is greater. 12.Do not install units outdoors. ©MODINE MANUFACTURING CO.