B4X-15140 and B7-15140 Adjustable Ambient Control Thermostats Product Specifications Application . . . Electric Heat Tracing Control The B4X-15140 and B7-15140 are designed to provide ambient sensing control of electric heat tracing circuits for freeze protection of piping and vessels. These adjustable thermostats can be used to control a single heating circuit or as pilot control of a contactor switching multiple heat tracing circuits. B4X-15140 . . . An epoxy polyamide coated die-cast alumi- num NEMA 4X enclosure provides watertight, dusttight and corrosion-resistant protection to the thermostat switch. B7-15140 . . . An aluminum lacquer finished die-cast aluminum enclosure provides NEMA 4 (watertight and dust- tight) and NEMA 7/NEMA 9 (explosionproof) protection to B4X-15140 the thermostat switch. The tamper-resistant, threaded and gasketed aluminum dial cover is externally adjustable. The B4X-15140 thermostat is approved for use in ordinary (nonclassified) locations. The B7-15140 is approved for use in both ordinary (nonclassified) and hazardous (classified) locations. 4 B7-15140 Ratings/Specifications . . . Voltage rating ............................................125/250/480 Vac Switch rating .............................................................22 amps Certifications/Approvals . . . 1 Switch type ...................................................................SPDT Underwriters Laboratories Inc. Electrical connection Ordinary Locations 2 Hazardous (Classified) Locations (B7-15140 only) B4X-15140 ............................ screw terminals on switch Class I, Divisions 1 & 2, Groups B, C and D 3 B7-15140 ............................................... terminal blocks Class II, Divisions 1 & 2, Groups E, F and G Class III, Divisions 1 and 2 Adjustable control range ......... 15°F to 140°F (-9°C to 60°C) Class I, Zone 1, Group IIB + H T6 2 Maximum control differential ...............................6°F (3.3°C) Setpoint repeatability ..........................................±2°F (1.1°C) International Electrotechnical Commission Maximum bulb exposure temperature .............. 160°F (71°C) IEC Certification Scheme for Explosive Atmospheres IEC Ex 5 UL 09.0004X (B7-15140 only) Bulb dimensions .............................9/16" x 3" (14 x 76 mm) Ex d IIC T6 6 Bulb material .....................................................stainless steel Ex tD A21 IP66 T85°C -40°C ≤ T ≤ +75°C Amb Notes . . . 1. See back for typical wiring diagram. 2. The B4X-15140 utilizes a ½" NPT conduit hub with an internal grounding termi- nal. The external bonding terminal is not to be used as the primary equipment grounding terminal. The internal grounding terminal shall be used as the primary equipment grounding means and the external grounding terminal is only for a supplemental (secondary) bonding connection where local authorities permit or require such a connection. 3. The B7-15140 utilizes a ¾" NPT conduit hub with an internal grounding terminal. The external bonding terminal is not to be used as the primary equipment grounding terminal. The internal grounding terminal shall be used as the primary equipment grounding means and the external grounding terminal is only for a supplemental (secondary) bonding connection where local authorities permit or require such a connection. 4. Date code format on nameplate is "YYWW" for year and week. 5. Zone hazardous locations flameproof gap and joint details. Activation plunger to guide through hole gap joints: 1.105" minimum length by 0.0030" maximum annular gap. Adjustment shaft to shaft through hole gap joints: 1.060" minimum length by 0.0030" maximum annular gap. 6. Plug is approved explosion-proof with the product as a full assembly, and does not carry individual markings. ® THERMON . . . The Heat Tracing Specialists 100 Thermon Dr. PO Box 609 San Marcos, TX 78667-0609 For the Thermon office nearest you • • Phone: 512-396-5801 Facsimile: 512-396-3627 1-800-820-HEAT visit us at . . . • • www.thermon.com In Canada call 1-800-563-8461 www.thermon.com B4X-15140 and B7-15140 Adjustable Ambient Control Thermostats 1 Typical Wiring Diagram . . . CB L1 L2/N Ambient Sensing Thermostat NO NC COM Heater Heat Tracing Junction Box Notes . . . 1. The National Electrical Code, Article 427-56(b) states: “Temperature- controlled switching devices which do not have an “off” position shall not be required to open all ungrounded conductors and shall not be permitted to serve as the disconnecting means.” The B4X/B7-15140 thermostats have no “off” position and therefore may be used for switching one conductor of a two-phase heating circuit. Form TEP0032-1009 © Thermon Manufacturing Co. Printed in U.S.A.