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Application
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 valve and controller.
Important: Utiliser ce détendeur de réponse rapide (QREV) et régulateur de surchauffe de
presicion (PSHC) uniquement en tant que dispositif de contrôle de fonctionnement. Lorsqu'une
défaillance ou un dysfonctionnement du détendeur et régulateur 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 détendeur et régulateur.
The QREV is a proportional control expansion valve that uses microelectromechanical system (MEMS)
microvalve technology to provide precise flow control for industry-standard HVAC and refrigeration
applications. See Figure 1. The QREV has a MEMS pilot valve that changes the pressure on the spool
valve. The signal from the PSHC controls the refrigerant flow. See Figure 2. Install the QREV at the
evaporator coil inlet.
Figure 1: QREV
Figure 2: PSHC
24-7664-3280 Rev. B
2019-05-20
Quick Response Expansion Valve and Precision
Superheat Controller Installation Guide
QREV, PSHC
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Table of Contents
Related Manuals for Penn QREV Series
Summary of Contents for Penn QREV Series
- Page 1 Quick Response Expansion Valve and Precision Superheat Controller Installation Guide Application 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.
- Page 2 The PSHC controls the QREV performance. The PSHC includes an internal MEMS pressure sensor. Install the PSHC at the outlet of the evaporator on a 1/4 in. SAE access valve, and connect the PSHC to the QREV with a 1.5 m (4.9 ft.) wiring harness with an integral temperature sensor. The PSHC monitors the pressure and temperature at the evaporator coil outlet and adjusts the signal to the QREV to control flow volume through the QREV and maintain the target superheat temperature.
- Page 3 Table 2: PSHC product code matrix Feature Code letter or number and description Product code example: PSHC01-134A-C Controller series PSHC PSHC Firmware version 134A = R-134A 0022 = R-22 404A = R-404A 407A = R-407A 407C = R-407C 407F = R-407F 410A = R-410A 417A = R-417A 422A = R-422A...
- Page 4 Figure 4: QREV06-QREV08 type valve dimensions, mm (in.) Figure 5: QREV09-QREV15 type valve dimensions, mm (in.) Figure 6: PSHC dimensions, mm (in.) Quick Response Expansion Valve and Precision Superheat Controller Installation Guide...
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Page 5: Installation
Installation Notice Risk of Property Damage Install the Quick Response Expansion Valve and Precision Superheat Controller according to the instructions and guidelines included with the device. These instructions and guidelines are intended to reduce the risk of malfunction of the device and resulting property damage. Failure to follow these instructions and guidelines could cause the device to malfunction, resulting in property damage. - Page 6 Installing the QREV An arrow molded on the QREV body indicates the proper flow direction through the valve. See Figure 7 and Figure 8. Note: Complete the installation of the QREV, PSHC, and new liquid line filter drier before you apply a vacuum and return the system to operation.
- Page 7 Important: As shown in the following figure, wrap the area where the braze connections meet the valve body with a wet quenching cloth to reduce heat transfer to the valve body when you braze the QREV braze connections. Figure 9: Brazing the QREV brazed connector fittings Installing the PSHC To install the PSHC, use a 1/4 in.
- Page 8 • Apply best practice methods and industry standards when you braze the access valve to the evaporator outlet. • Ensure that the access valve, evaporator outlet, and copper connectors are free of metal filings and contaminants before brazing. Metal filings and contaminants can damage the PSHC and void the warranty.
- Page 9 Figure 12: Brazed access valve Figure 13: Use two wrenches to attach PSHC to access valve Mounting the PSHC on the access valve Mount the PSHC onto the access valve. Turn the PSHC housing clockwise by hand until it is hand- tight. Use 7/16 in. and 9/16 in. wrenches in tandem to tighten the PSHC connection. See Figure 13. Important: Do not apply more than 9 ft•lb (12 N•m) of torque to the flare nuts on pressure connection line fittings.
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Page 10: Installing The Thermistor
Installing the thermistor Install the thermistor at the evaporator outlet near to the access fitting using a zip tie. Position the thermistor at either the 10 o’clock or 2 o’clock position only. Clean the surface of the tubing with sandpaper, if needed. See Figure 14. Figure 14: Thermistor installation at evaporator outlet Figure 15: Insulation secured to the thermistor Apply thermal paste between the thermistor and the evaporator outlet to increase thermal transfer... - Page 11 Notice Risque de dégâts matériels Ne pas mettre le système sous tension avant d'avoir vérifié tous les raccords de câblage. Des fils formant un court-circuit ou connectés de façon incorrecte risquent d'endommager irrémédiablement l'équipement. Notice Risk of Property Damage Insulate and secure each unused wire lead before applying power to the Precision Superheat Controller.
- Page 12 • Use proper electrostatic discharge (ESD) precautions during installation and servicing to avoid damaging the electronic circuits of the device. PSHC-QREV application wiring See the QREV and PSHC technical specifications table for power requirements. Power supply usage and application When you install the QREV and PSHC, observe the following guidelines when you wire the application. Grounding PSHCs that you network with non-isolated instrumentation must share only one single-point earth ground, or you must fully isolate them from each other.
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Page 13: Wiring Harness
See the following figure for more information. Figure 17: Grounding errors Figure 18: Single PSHC-QREV wiring diagram Connect the white output signal wire, two 0.75 mm (18 AWG) white wires, to the QREV electrical connections. See Figure 18 and Table 3. Isolate and insulate the brown Pin 5 and purple Pin 10 wires. You do not use these wires in this application. -
Page 14: Troubleshooting
Table 3: PSHC and wiring harness pin assignments for WHA-PSHC-150 Pin number Pin name Pin function Color and size of wire Pin 1 Power input Red, 0.75 mm (18 AWG) Pin 6 Power input Black, 0.75 mm (18 AWG) Pin 3 DATA- RS485- communication A terminal Black, 0.25 mm... -
Page 15: Repair Information
Table 4: Troubleshooting Condition Cause Solution High superheat Inadequate power to the valve Check the power source voltage. The voltage leaving the transformer and entering the This may indicate that the QREV is not PSHC should be close to the intended supply opening fully. - Page 16 QREV and PSHC technical specifications Table 5: QREV technical specifications Specification Description Power supply 12 VDC ±15% for 12 V QREV control 24 VAC or 24 VDC ±15% (50/60 Hz ± 1%) for 24 V QREV control Electrical connection Two 0.50 mm (20 AWG), UL 1332, copper wires, with black FEP insulation Power consumption Max power 10±1 W, Nominal 5±1 W |t operating ≥...
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Page 17: North American Emissions Compliance
Table 6: PSHC technical specifications Specification Description Suitable environmental < 95% RH humidity Superheat factory setpoint 5.5°C (10°F) Voltage requirements 12 VDC ±15% for 12 V QREV control 24 VAC or 24 VDC ±15% (50/60 Hz ± 1%) for 24 V QREV control Power consumption ≤... -
Page 18: Points Of Single Contact
Canada This Class (B) digital apparatus meets all the requirements of the Canadian Interference-Causing Equipment Regulations. Cet appareil numérique de la Classe (B) respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada. Points of single contact APAC Europe NA/SA JOHNSON CONTROLS...
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