PENN Controls - Building Automation and Controls - Electronic Expansion Valve - QREV and PSHC Electronic Expansion Valve and Superheat Controller - QREV - Application - B - 2019-05-20

Quick Response Expansion Valve and Precision Superheat Controller Installation Guide

brand
PENN Controls
prodname
QREV and PSHC Electronic Expansion Valve and Superheat Controller
docrev
B
doctype
Installation Guide
docpartnumber
24-7664-3280
revised_modified
2019-05-20
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

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.

Note: The QREV, PSHC, and wiring harness are available as individual items and you must purchase each item separately.

You can apply the QREV and PSHC in most HVACR applications that use any of the 18 approved refrigerants. The capacity can be fractional values. Figure 1 shows the 01 to 05 models, Figure 2 shows the 06 to 08 models, and Figure 3 shows the 09 to 15 models.

The following applications are ideal for the QREV and PSHC:

  • Refrigerated display cases, both self-contained and with remote condensers
  • Commercial refrigerators and freezers
  • Heat pumps
  • Walk-in coolers and freezers
  • HVAC systems
  • Chillers

Table 1 explains the naming convention for the QREV model numbers, using the example code QREV01-24SC-C.

Table 1. QREV product code matrix
Feature Code letter or number and description Product code example: QREV01-24SC-C
Family code QREV QREV
Sequence Code 01–08 01
09–15
Valve voltage 12 = 12 VDC 24
24 = 24 VDC/VAC
Valve body type S = Straight Body Connection SC
Engineering version C = Alpha character
Packaging C = Individual C
Note: Refer to the QREV product code numbers and nominal capacities tables in the Quick Response Expansion Valve (QREV) and Precision Superheat Controller (PSHC) Product Bulletin (LIT-12012398) to determine the QREV capacity that you require.

Contact your Johnson Controls account representative about availability of 12 VDC QREV models.

Table 2 explains the naming convention for the PSHC model numbers, using the example code PSHC01-134A-C.

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 01 01
Refrigerant type 134A = R-134A 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
422D = R-422D
427A = R-427A
438A = R-438A
448A = R-448A
449A = R-449A
405A = R-405A
452A = R-452A
0507 = R-507
513A = R-513A
Packaging C = Individual C