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 3 shows the 01 to 05 models, Figure 4 shows
the 06 to 08 models, and Figure 5 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
01–08
Sequence Code
09–15
01
12 = 12 VDC
Valve voltage
24 = 24 VDC/VAC
24
Valve body type
S = Straight Body Connection
Engineering version
C = Alpha character
SC
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.
Quick Response Expansion Valve and Precision Superheat Controller Installation Guide
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