Owner's Manual for Stelpro 0521TDIS Agricultural Unit Heater

Quick guide from the manual

This manual provides installation, operation, and maintenance instructions for the Stelpro Agricultural Unit Heater (Series SFH). Key safety requirements include installing the unit at a minimum height of 6 ft (1.83 m) from the floor and maintaining a minimum clearance of 6 in. (15 cm) from vertical surfaces and 24 in. (60 cm) of free space under the unit. Installation must be performed by a certified electrician in accordance with local building and electrical codes.

Installation

Before starting, ensure you have the necessary tools: stud finder, Phillips No. 2 screwdriver, flat screwdriver, measuring tape, wire stripper, ratchet with 1/2 in. socket, and a level. The unit and bracket weigh 35 lbs (16 kg), so ensure the mounting surface can support this weight.

Unit location

Install the heater in an open area. Ensure the mounting bracket is attached to a stud. Check for pipes, electrical wires, or other components inside the ceiling before drilling.

Attaching the bracket

Locate studs using a stud detector. Secure the bracket using two 1/2 x 1 1/2 in. lag bolts. Ensure the bracket is level before proceeding.

Attaching the unit

Loosen the nut on top of the unit and release the slotted washer. Lift the unit to insert the nut into the bracket mounting hole, ensuring the screw locks into the notch. Insert the slotted washer between the bracket and the nut, position the unit, and tighten the nut firmly.

Connecting the electrical wires

Turn off the power supply at the main electrical panel before beginning. Open the junction box cover by unscrewing the two screws. Remove the protective cap to unblock the opening for power cables. Install a sealed connector (not included) and insert the power cables, leaving 6 in. (15 cm) of wire inside the box. Connect the power supply and thermostat wires according to the specific diagram for your model (with or without built-in thermostat). Ensure all terminal screws are tightened securely.

Operation

Restore power at the electrical panel. Use the main switch to turn the unit on. For models with a built-in thermostat (SFH0521TDIS and SFHGX0521TDIS), adjust the temperature using the thermostat dial. Use the operation mode selector switch to choose between Ventilation only mode or Ventilation and heating mode.

Maintenance

Turn off the power at the electrical panel before cleaning. Dust the unit with a soft cloth or use a vacuum cleaner with a dust brush in dusty areas. The unit is water-resistant and can be hosed down. Never use metal brushes, scouring pads, chlorine, abrasive cleaning products, or hydrochloric-acid based products.

Restoring thermal protection

If the unit overheats, the thermal protection may trigger. For the SFHGX0521TDIS model, turn off the power, open the junction box cover, and press the button at the center of the thermal protection component. Close the cover and restore power.