Two New Products that can make you Money: Time is money and the more time it takes you to install a product the less money you make. Want to up your Control Game? Watch this video: Think about it: How long does it take for you to install and set up a thermal expansion valve? What if you could reduce that time by at least an hour, and have more precise control of your superheat? What about Walk in coolers or freezers? What if you could reduce your set up time and leave you with a way to diagnose a problem remotely? Would that up your service game? Have you tried either of these products yet? If so please let me know in comments, and let me know how much it reduced your installation and startup time.
Meet the PENN Controls Quick Response Valve
The Quick Response Expansion Valve (QREV) and the Precision Superheat Controller (PSHC) together are a compact, electronic, closed loop, rapid response superheat control solution for refrigeration and HVAC applications.
The QREV is next generation electronic expansion valve (EEV) technology, and provides maximum evaporator efficiency by quickly reaching the preferred superheat. The QREV includes a silicon-based microelectromechanical system (MEMS) pilot valve that responds to a signal from the PSHC and pilots a smooth gliding spool valve that regulates refrigerant flow through the QREV, virtually eliminating valve wear and extending valve life. You can order QREVs in several capacity ranges.
The PSHC is an electronic superheat controller that provides precise control to the QREV through varying load conditions. You install the PSHC on a pressure port at the evaporator outlet. The PSHC uses an internal pressure sensor and an external temperature sensor to control the QREV flow and maintain
the preferred superheat at the evaporator outlet. The PSHCs are currently set up to control one of 18 approved refrigerants for easy commissioning.
Features and benefits
Quick response valve
Provides rapid precision control of evaporator outlet superheat.
Silicon-based MEMS technology and smooth-action spool valve
Reduces valve wear and extends valve life.
Closed loop solution
Simplifies installation and commissioning without the need for a front-end or supervisory controller.
Modbus® Remote Terminal Unit (RTU) compliant subordinate device
Provides remote monitoring and adjustment on modbus networks.
Use in limited-space applications.
Important: Use the Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC) only as an operating control. Where failure or malfunction of the valve and controller could lead to personal injury or property damage to the controlled equipment or other property, additional precautions must be designed into the control system. Incorporate and maintain other devices, such as supervisory or alarm systems or safety or limit controls, intended to warn of or protect against failure or malfunction of the QREV and PSHC.
Important: Utiliser ce Quick Response Expansion Valve (QREV) et Precision Superheat Controller (PSHC) uniquement en tant que dispositif de contrôle de fonctionnement. Lorsqu’une défaillance ou un dysfonctionnement du QREV et PSHC risque de provoquer des blessures ou d’endommager l’équipement contrôlé ou un autre équipement, la conception du système de contrôle doit intégrer des dispositifs de protection supplémentaires. Veiller dans ce cas à intégrer de façon permanente d’autres dispositifs, tels que des systèmes de supervision ou d’alarme, ou des dispositifs de sécurité ou de limitation, ayant une fonction d’avertissement ou de protection en cas de défaillance ou de dysfonctionnement du QREV et PSHC.
The QREV and the PSHC replace electronic expansion valves (EEVs) and standard thermostatic expansion valves (TEV/TXVs) in commercial refrigeration and HVAC applications.
The QREV and the PSHC form a closed loop solution that does not require any additional controller so that you can install and commission it easily. The QREV and the PSHC provide rapid response superheat control through varying load conditions.
The QREV is compact and lightweight. Install the QREV at the evaporator coil inlet just like an EEV or standard TXV.
Figure 2: QREV
Install the PSHC at the evaporator coil outlet. It has a standard 1/4 inch SAE internal flare fitting with integral Schrader® depressor. The PSHC has an internal pressure sensor and a microprocessor that
you connect to a temperature sensor on the wiring harness at the evaporator outlet. You connect the PSHC, temperature sensor, and QREV together with the wiring harness. See Figure 4. Each PSHC model is factory-set to operate with one of 18 approved refrigerants.
Figure 3: PSHC
2 Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC) Product Bulletin
You can use the QREV and PSHC for HVAC and refrigeration systems that use any of the approved refrigerants in Table 3. At the specified conditions, the nominal capacity of available QREV models is listed in Table 3 and Table 4.
For the QREV and PSHC dimensions, see Physical features and dimensions. For detailed information about ordering the QREV and PSHC, see Ordering information.
Figure 4: QREV and PSHC installed on a typical evaporator
The PSHC senses both temperature and pressure at the evaporator outlet and calculates the actual superheat sensed at the outlet. Because the sensed superheat value varies away from the user-selected superheat value, the PSHC modulates the electronic signal to the QREV.
The QREV has an electronically actuated, silicon-based MEMS pilot valve that receives the electronic signal and then provides a proportional command pressure to the spool valve. See Figure 5.
The spool valve uses feedback pressure to balance the command pressure, and the spool position
is determined by the balance between these two pressures. The spool position in the valve body determines the size of the main spool valve orifice and the refrigerant volume that flows through the QREV.
Figure 5: Microelectromechanical system layers
Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC) Product Bulletin 3
Meet The PENN Controls A525
A525 Series electronic refrigeration controllers with adaptive defrost offer multiple functions in a smart controller, delivering efficiency, easy installation and use, application flexibility, and network integration. Control all aspects of refrigerated spaces, with five control relays for variable speed fans, compressor, defrost and alarms; two-speed fan control to optimize air flow; unique adaptive defrost algorithms to save energy; and numerous customization options.
The A5xx Series Wall Mount Refrigeration and Defrost Controllers provide refrigerated space and defrost control for low and medium temperature refrigeration applications. The A5xx Controller includes five line- voltage, dry-contact relays to control the compressor, defrost heater or solenoid, evaporator fans, and user- provided alarm devices. The A5xx Controller can control two-speed evaporator fans and resistive heat, hot-gas bypass, or passive defrost.
The A5xx Controller’s adaptive defrost adjusts the defrost schedule to the minimum number of defrost intervals that you require to achieve peak efficiency, save energy, and maintain consistent space temperature.
The A5xx Controller includes an IP65 enclosure with holes in the enclosure base for wall and surface mounting. You can order an optional DIN rail mounting kit (part no. BKT524-1K).
and Defrost Controllers
Features and benefits
Plain language programming—Displays a scrolling alphanumeric message system that shows you what to
Time-based or adaptive defrost—Provides a choice between a conventional time-based defrost or the more advanced adaptive defrost. Adaptive defrost improves efficiency by learning and automatically adjusting the defrost schedule of your system.
Meets Title 24 standards—You can program the controller to determine when to operate the fan at high- speed, low-speed, or set the fan to off. This feature provides better air circulation in the conditioned space and meets energy efficiency standards.
Complete integration with PENN Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC)—Facilitates the adjustment of superheat levels and the selection of refrigerant types for optimal efficiency.
Alarming—Facilitates the programming of high-temperature, low-temperature, door open, man-in-room, refrigeration leak, high-pressure, low-pressure, and sensor failure conditions. Failure messages display in plain language to reduce confusion about the source of an alarm.
Reporting and recording—Automatically records temperatures at preferred intervals to improve food safety. You can also create reports to show that food storage occurs at the required temperatures.
Program copy and firmware updates—Features a USB port that you can use to upload your preferred settings or to update the controller’s operating firmware.
Talk to these Remotely with the Johnson Controls Verasys
The Verasys® system provides bundled equipment and controls solutions that are well-proven. Verasys is a plug and play solution that is part of the Johnson Controls® SMART Systems. The Verasys system features both simple, configurable controllers and HVACR equipment from the factory or installed in the field. You can use Verasys to configure many HVACR controls applications for one building or an entire enterprise comprised of multiple buildings, without using special programming tools or control engineering.
Verasys has a key role in the Internet of Things (IoT) ecosystem in the light commercial market. The technology is based on the SMART equipment technology and uses the core assets of Johnson Controls Metasys® product lines. You can use Verasys to create installation use cases that provide standard feature sets for the light commercial space.