Technical content reviewed November 13, 2026 · Tillman & Associates
Start with the complete heater
A mounting or control request begins with the heater model, cabinet size, electrical nameplate and installation conditions. Similar-looking hardware or a familiar thermostat family name does not establish compatibility.
Send photographs of the heater label, existing accessory and mounting location. Identify whether you need a complete kit, an individual replacement component or a new control function so the quote can describe the correct scope.
Choose the support arrangement
FX6-family mounting documents cover distinct basic, wall, hanging, swivel-hanging and pipe arrangements. Match the kit carton and current instructions to the exact heater. Do not transfer FX6 kit numbers to an AH, HP or FR installation by appearance.
The linked wall-kit instructions require a structure capable of supporting the heater, installer-supplied structural fasteners and additional support during transport. The stated suspended-weight limit belongs to that kit’s instructions, not every Ruffneck mounting arrangement.
Thermostats are control accessories
XT-311 and XT-312 Defender thermostats belong in the controls category. Their catalog describes industrial heating-only, cooling-only or ventilation control applications. Select the exact switching arrangement, electrical rating, temperature range and required approvals for the intended circuit.
A thermostat may control a contactor or fan rather than carry the full heater load. Provide the wiring diagram and desired sequence, including any remote control or building-system interface. Ask Tillman to confirm the compatible device and wiring requirements.
Disconnects and a complete accessory request
XS is the manufacturer’s disconnect-switch family. A disconnect provides electrical isolation; it does not replace temperature control. Confirm the selected switch’s electrical rating, installation arrangement and hazardous-location suitability.
List mounting kits, controls, disconnects and spare parts separately with quantities. Include what already exists and what the installer will supply. Tillman can coordinate a complete request and identify items that require factory confirmation rather than assigning a part number from an incomplete description.
What to send Tillman
- Heater model, serial number, cabinet and electrical label photos
- Complete kit or individual replacement-part scope
- Mounting method, structure, available space and transport exposure
- Control function, setpoint range, load and wiring diagram
- Site classification, enclosure/environment and disconnect requirements
- Quantity of each accessory and existing items to retain
Common questions
Should XT-311 and XT-312 have separate heater cards?
They are thermostats, so they are grouped here as control accessories.
Are all mounting kits interchangeable?
No. Verify the exact heater/cabinet compatibility and complete kit contents.
Does a disconnect replace a thermostat?
No. Isolation and temperature control are different functions.