Heavy-Duty Electric Unit Heaters OWNER’S MANUAL Model: DR-P130 DR-P350 DR-P275 DR-P2100 DR-P3150 DR-P3200 IMPORTANT INSTRUCTIONS READ & SAVE 1
IMPORTANT INSTRUCTIONS PLEASE READ ALL INSTRUCTIONS BEFORE USING THIS HEATER NOTE: There may be a trace of smoke or odor when unit is first operated. Don’t be alarmed. This indicates that a drop of oil fell on the heating coil during the manufacturing process. It will quickly evaporate and should not re-occur. Make sure that the room in which the appliance is located is well ventilated during this operation.
Features and Benefits These heavy-duty Electric forced-air unit heaters are suited for factories, schools, service buildings, dormitories, hospitals, stock rooms and other public buildings. The Heaters’ high capacity and wide range of voltages/phases selections meet most installation requirements. All units are equipped with overheat protection and a totally enclosed, permanently lubricated motor. Can be installed for use in down flow or horizontal applications.
INSTALLING INSTRUCTIONS All wiring must be installed by a certified electrician according to the electrical safety. The ceiling heater must be grounded in accordance with all national and local building codes. All wiring procedures and connections shall be in accordance with the national and local codes having jurisdiction. Before installation: Disconnect the main supply connection. The heater must be connected to individual branch circuit.
MOUNTING ROD MOUNTING HORIZONTAL DISCHARGE 1 Install four threaded mounting rods in the threaded holes and secure in place using lock nuts. 2 Securely attach the four mounting rods to the ceiling. (Refer to Table 1 for wall and ceiling clearances, and Table 2 for mounting rod spacing) Mounting Rod(4) Lock Nut Unit Heater Threaded Mounting Holes(4) 6 Feet Min. Clearance to Floor VERTICAL DISCHARGE 1 Remove bolts from the threaded holes in the back of the heaters.
WIRING BRANCH CIRCUIT (POWER) 1. Connect heater only to the voltage, amperage and frequency specified on the nameplate. 2 Field wiring must be properly sized to carry the amperage in accordance with the NEC. 3 The access door is hinged. There are either one or two screws accessible from the bottom that must be removed to gain access. 4 A knockout is provided in the back of the heater close to the power terminal board. The control terminal board knockout is 1/2 inch conduit size.
2 DR-P350 14 M5X1.0 3 DR-P275 6 M6X1.0 4 DR-P2100 6 M6X1.0 5 DR-P3150 6 M6X1.0 6 DR-P3200 10 M6X1.0 6 The power terminal board is equipped with box terminals sized to accept the correct size power supply wire. Wire rated at 600V and 60°C is satisfactory for the heater branch circuit. Copper wire is satisfactory for connection to the heater power terminal board box terminal. 7 Each heater has a wiring diagram affixed to the inside of the access door.
CONTROL WIRING Line voltages is present on some of the terminals on the control terminal board. Always disconnect the power from the heater before making any connections to the control board to prevent hazard. 1.Use min. 600 volt, NEC Class 1 insulated wire for all control circuit wiring. 2.Use a crimp-on type fork terminal on the wire ends that attach to the control terminal board if more than one connection is to be made under the terminal screw. 3.Control wiring must be rated minimum 18 AWG.
Wiring Diagrams DR-P130 DR-P350 9
DR-P2100 DR-P275 10
DR-P3150&DR-P3200 11
TROUBLE SHOOTING If your heater fails to operate, please follow these procedures: This heater has a thermal cut-off protection. If the thermal cut-off protection trips, switch off the power, switch off the circuit breaker. The unit should reset automatically after 10-30 minutes. If the thermal cut-off protection trips again, consult a certified/licensed electrician to determine the reason for overheating. Problem Probable Cause Solution Overheat protection has temporarily deactivated the heater.
How long is the warranty? This heater comes with a ONE-YEAR LIMITED COMPONENT WARRANTY. If your unit does not appear to be working properly, please contact our service center by calling 1-800-317-1688. Prior to your call, we encourage you to visit our service related website www.DrHeaterUSA.com for troubleshooting tips and service instructions if needed. Warranty Information Register your product at our website: Or visit DrHeaterUSA.
