GTLU3044 Thermostat 190°F | 70 Inch Probe

GTLU3044 Thermostat 190°F | 70 Inch Probe

The GTLU3044 is a high-reliability bulb and capillary
thermostat designed for precise temperature control and over-temperature
protection in hot-water pressure washers, boilers, heat exchangers, and industrial
process equipment. Featuring a rugged sensing bulb, flexible capillary tube, and
snap-action switch mechanism, this thermostat provides accurate switching at a
fixed cutoff point, helping safeguard coils, burners, pumps, and operators from
overheating conditions.

Packaged in a compact, field-serviceable housing, the GTLU3044 is ideal for OEM
builders and service technicians who need a dependable temperature limit device
that integrates easily into new builds or retrofit projects. The remote bulb
design allows the sensing element to be mounted directly in the heat source
(coil, tank, or pipe) while the control body is mounted in a protected, convenient
location for wiring and inspection.

Thermostat Design & Operation

Bulb & Capillary Technology

• Liquid-filled sensing bulb responds quickly to temperature changes in the heated medium (water, oil, or glycol mixes).
• Capillary tube transmits pressure from the bulb to the internal switch, allowing remote mounting of the control body.
• Snap-action switching provides reliable contact opening at the set temperature, helping to cut power to burners, heating elements, or control circuits.
• Remote sensing design keeps electrical components away from the hottest area, improving long-term reliability.

GTLU3044 Fixed High-Limit Protection

• Configured as a high-limit safety thermostat with a fixed OFF temperature (commonly used as an over-temperature cutoff).
• Designed to open the circuit when the setpoint is exceeded, protecting coils, hoses, and pump components from damage.
• Ideal as a secondary safety device alongside adjustable control thermostats or PLC temperature control.
• Helps equipment comply with temperature-safety best practices required in many commercial and industrial installations.

Key Specifications – GTLU3044

Functional Characteristics

• Type: Bulb & capillary temperature control / high-limit thermostat.
• Sensing Element: Immersion bulb (typically brass or stainless, depending on revision).
• Capillary Length: Flexible capillary tube to allow remote mounting of the control body.
• Temperature Function: Fixed OFF at high-limit setpoint; automatic reset when temperature falls below reset threshold (depending on system wiring).
• Application: Hot-water pressure washers, boilers, heat exchangers, industrial tanks, and process heating equipment.

Electrical & Mechanical Data

• Switch Type: Single-pole snap-action contact (SPST or SPDT depending on version).
• Contact Rating: Suitable for standard control-voltage and burner/element relay circuits (verify against system load and local code).
• Housing: Compact control body with terminal connections, designed for panel or chassis mounting.
• Ingress Protection: Intended for mounting in protected enclosures or control cabinets.
• Operating Environment: For use in dry, non-condensing electrical compartments with proper strain relief and grounding.

Applications & Use Cases

Hot-Water Pressure Washers

• Coil temperature protection in burner-fired pressure washers to prevent excessive outlet temperatures.
• High-limit cutoff for electric-element wash systems, shutting down heat if water flow is interrupted.
• Retrofit safety upgrades on older washers that lack modern high-limit protection.

Boilers & Process Heating

• Auxiliary high-limit on small boilers, heat exchangers, and process tanks.
• Equipment safety interlock for glycol heaters, oil heaters, and closed-loop systems.
• Redundant safety layer in PLC-controlled systems that require a mechanical backup device.

OEM & Service Applications

• OEM skid builders integrating fixed high-limit devices into packaged hot-water systems.
• Service technicians replacing failed or out-of-tolerance limit controls on industrial equipment.
• Custom retrofits where an additional temperature safeguard is required by site or insurance standards.

Installation & Wiring GTLU3044

Mounting & Sensing

• Install the sensing bulb in a properly sized immersion well or directly in the flow path, per equipment manufacturer instructions.
• Route the capillary tube carefully to avoid kinks, sharp bends, or abrasion points.
• Mount the control body in a dry, accessible location for wiring and future service.

Electrical Integration

• Wire the thermostat in series with the burner control, heating element contactor, or safety circuit according to the equipment wiring diagram.
• Use properly rated wire, terminals, and strain relief for the environment and load.
• Confirm correct operation during commissioning by verifying that the circuit opens when the bulb is heated above the limit threshold.

Maintenance & Safety

Service Best Practices

• Inspect the capillary and bulb for physical damage during routine equipment maintenance.
• Periodically verify trip and reset behavior as part of your safety-device test procedure.
• Replace the thermostat if there are signs of corrosion, insulation breakdown, or erratic switching.
• Always de-energize equipment before servicing the thermostat or opening the control housing.
• When installed and maintained correctly, the GTLU3044 provides a reliable safeguard against overheating in hot-water and process-heat systems.