Refrigeration Thermostats - Refrigeration and HVAC

Marine refrigeration and HVAC thermostats sense temperature and switch or control compressors, fans, heaters, and valves. They are available as mechanical capillary thermostats or electronic controllers for provision rooms, chilled-water systems, air-conditioning units, and refrigerated spaces.

ProShipWorks provides end-to-end support to source and supply Refrigeration Thermostats for marine vessels, ship operators, industrial facilities, maintenance teams and procurement departments.

Last updated: October 11, 2026

Product Information

Product Name	Refrigeration Thermostats
Product Category	Refrigeration and HVAC
Product Reference	1427
Brands / Manufacturers	Danfoss, Johnson Controls/PENN, Ranco
Unit of Measure	Piece

Key Features

Key Feature
1. Mechanical or electronic temperature control
2. Adjustable set point and differential
3. Capillary bulb, probe, or remote sensor options
4. SPDT or relay outputs for control circuits
5. Suitable variants for vibration, humidity, and marine service

Applications of Refrigeration Thermostats

Application
1. Marine provision and cold-storage refrigeration
2. Shipboard air-conditioning and HVAC units
3. Chilled-water, fan-coil, and machinery-space temperature control

Models & Manufacturers

Model	Manufacturer
KP Series KP 61	Danfoss
RT Series RT 5	Danfoss
A19 Series	Johnson Controls/PENN
O Series Mechanical Thermostats	Ranco

Technical Specifications

Model	Specification	Value	Unit
KP 61	Temperature range	-30 to +15	°C
KP 61	Contact configuration	SPDT	—
RT 5	Temperature range	Typically -5 to +30	°C
A19 Series	Control type	Electronic or electromechanical temperature control, depending on variant	—
O Series	Sensing method	Remote capillary bulb	—

Standards, Certifications & Class Approval

Review the available standards and approval information relevant to the product. Actual certification, material traceability, inspection and classification requirements depend on the product type, intended application and purchasing specification.

Applicable Standards & Certification	Applicable products may comply with IEC 60730-1 and IEC 60730-2-9 for automatic electrical temperature controls. Actual conformity, EMC, environmental rating, and electrical approvals depend on the exact model and installation.
Class Approval	Thermostats are not universally class-approved as standalone items. Marine acceptance may require approved equipment, type approval, or system documentation from DNV, ABS, Lloyd's Register, Bureau Veritas, or ClassNK, depending on vessel requirements and installation.

Installation, Maintenance & Safety Information

Installation Notes	Verify temperature range, sensing method, contact rating, supply voltage, and refrigerant or HVAC application before installation. Mount the sensing bulb or probe at the specified location, protect capillary tubing from sharp bends and vibration, and connect wiring according to the manufacturer diagram.
Maintenance Tips	Check set point and differential during scheduled HVAC or refrigeration inspections. Inspect terminals, capillary tubes, probes, seals, and enclosure condition. Compare indicated temperature with a calibrated reference and replace thermostats showing unstable switching or inaccurate readings.
Safety Notes	Isolate electrical power and follow lockout/tagout procedures before servicing. Prevent contact ratings from being exceeded and use suitable relays or contactors for compressors and motors. Refrigerant-system work must be performed by qualified personnel in accordance with vessel procedures and applicable regulations.