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Table 4: Troubleshooting

Condition

Cause

Solution

Inadequate power to the valve

Check the power source voltage. The voltage

leaving the transformer and entering the

PSHC should be close to the intended supply

voltage of 24 V. A transformer voltage that

is too low could indicate problems with the

transformer, its wiring, or its VA rating being

too low for a small load. If the voltage that

enters the PSHC is low but the transformer

voltage is normal, there could be a problem

with terminal connections or interconnecting

wiring.

Temperature sensor incorrectly

mounted

Verify that the PSHC temperature sensor is

firmly mounted to the evaporator's outlet

at a 10 o'clock or 2 o'clock position. Check

that the temperature sensor is wrapped with

insulation.

Over voltage to QREV

Check the resistance across the valve

terminals. Remove both power connections

from the QREV and measure its resistance with

a multimeter. The resistance reading should

be between 26 ohms to 34 ohms for a 24 V

valve. If the resistance is significantly out of

this range the QREV is damaged and should be

replaced.
Check that the PSHC gain settings meet the

system requirements.

High superheat

This may indicate that the QREV is not

opening fully. Common symptoms

include compressor short cycling.

QREV slow or quick to open

Connect and disconnect the power to the valve

several times to manually actuate the valve.
Check that the PSHC gain settings meet the

system requirements.

QREV slow or quick to close

Connect and disconnect the power to the valve

several times to manually actuate the valve.

Temperature sensor incorrectly

mounted

Verify that the PSHC temperature sensor is

firmly mounted to the evaporator's outlet

at a 10 o'clock or 2 o'clock position. Check

that the temperature sensor is wrapped with

insulation.

Low superheat

This may indicate that the QREV is

staying open. Common symptoms

include compressor frosting.

Severely oversized valve

Determine the capacity of the evaporator and

check the valve model number to confirm

that the two are compatible regarding their

capacities.

Repair information

If a QREV or PSHC fails to operate within its specifications, replace the unit. For a replacement QREV or

PSHC, contact the nearest Johnson Controls

representative.

Quick Response Expansion Valve and Precision Superheat Controller Installation Guide

Содержание PSHC Series

Страница 1: ...e 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 ...

Страница 2: ...rated 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...

Страница 3: ... 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 Refrigerant type 513A R 513A 134A Packaging C Individual C Dimensions Figure 3 QREV01 QREV05 type valve dimensions mm in 3 Quick Response Expansion Valve and Precision Superheat Controller Installation Guide ...

Страница 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 4 ...

Страница 5: ... un dysfonctionnement de l appareil et causer des dégâts matériels Use a wiring harness to connect the QREV and PSHC Mount the suction line temperature sensor at the outlet of the evaporator to measure the temperature of the vapor leaving the evaporator Figure 7 shows a typical application Install the PSHC at the outlet of the evaporator The PSHC replaces the thermostatic expansion valve s TXV bul...

Страница 6: ...rator inlet Make sure that the braze connections the field copper tubing and copper connectors are free of metal filings and contaminants before brazing Metal filings and contaminants can damage the QREV and void the warranty Do not cut or swage the braze connections on the QREV because this voids the warranty Do not apply the brazing flame directly to the QREV braze connections Apply the flame to...

Страница 7: ...nstallation of the QREV PSHC and new liquid line filter drier before you apply a vacuum and return the system to operation See Installing the QREV for more information Flushing gases You can use flushing gases such as dry nitrogen to flush the line with the PSHC in line However the unpowered PSHC is almost fully closed and so allows flushing gases to leak and enter down stream of the valve at very...

Страница 8: ...ough for the access valve to extend beyond the insulation so that you can install the PSHC to the access valve See Figure 12 Figure 10 PSHC installation orientation on a horizontal evaporator outlet pipe Figure 11 PSHC installation orientation on a vertical evaporator outlet pipe Important When you install the 1 4 in SAE access valve observe standard practices for brazing the fitting to the evapor...

Страница 9: ...pply more than 9 ft lb 12 N m of torque to the flare nuts on pressure connection line fittings Overtightening or applying more than 9 ft lb 12 N m of torque may damage fitting threads and void the warranty 2 Attach the wiring harness 10 Pin connector to the PSHC as shown in Figure 13 Note If the PSHC is located in a wet or potentially wet environment apply silicone dielectric grease of any grade i...

Страница 10: ...nsfer between the evaporator outlet and the thermistor 3 Ensure that the thermistor wire is not tied down to the tubing The zip tie should be secured around the thermistor body only See Figure 14 Do not tie the thermistor wire leads to the refrigeration tubing 4 Wrap the thermistor with insulation material and secure the insulation in place using a zip tie See Figure 15 Wiring Notice Risk of Prope...

Страница 11: ...sque d entraîner des dégâts matériels Notice Risk of Property Damage Do not run low voltage cable in the same conduit or wiring troughs with high voltage wires Running low and high voltage wires in the same conduit or wiring troughs may damage the equipment or cause system malfunction Notice Risque de dégâts matériels Ne pas faire courir un câble basse tension dans les mêmes gaines ou goulottes él...

Страница 12: ...ogy if PSHCs are networked with non isolated 3rd party instrumentation and both share the same power supply Most 1 2 wave implementations use a single diode only which can result in a high current ground loop Wiring a PSHC QREV application 1 Choose a QREV model that is rated for your application s supply power Note The PSHCs operate on 12 VDC 24 VDC or 24 VAC The QREVs are voltage specific See Tab...

Страница 13: ... purple Pin 10 wires You do not use these wires in this application 4 If you use but do not network a single or multiple PSHC units isolate and insulate the red Pin 3 black Pin 4 and green Pin 2 RS 485 communication wires 5 Coil and secure all unused wires Wiring harness The WHA PSHC 150 1 wiring harness is compatible with all PSHC product types See the following table and figure for more informat...

Страница 14: ...Thermistor power Black 0 25 mm 2 24 AWG Pin 7 PWM PWM output White 0 75 mm 2 18 AWG Pin 8 PWM PWM output White 0 75 mm 2 18 AWG Pin 5 GPB General purpose not utilized Brown 0 50 mm 2 20 AWG Pin 10 GPA General purpose not utilized Purple 0 50 mm 2 20 AWG Figure 19 Pin assignments for model WHA PSHC 150 Troubleshooting Table 4 describes troubleshooting procedures for the PSHC and QREV However before...

Страница 15: ... should be replaced Check that the PSHC gain settings meet the system requirements High superheat This may indicate that the QREV is not opening fully Common symptoms include compressor short cycling QREV slow or quick to open Connect and disconnect the power to the valve several times to manually actuate the valve Check that the PSHC gain settings meet the system requirements QREV slow or quick t...

Страница 16: ...raze connections length QREV 01 08 6 9cm 3 in each QREV 09 15 10 4 cm 4 1 in each Enclosure IP67 when you use dielectric grease on the wire harness connector Moisture and corrosion 100 hour salt spray test ASTM B117 Fluid cleanliness requirement ISO 11171 18 16 13 Warranty 3 years Compliance North America United States ULus Listed File YIOZ MH3536 Canada cUL Listed File YIOZ7 MH3536 Table 6 PSHC t...

Страница 17: ...ant provisions of the RoHS Directive and EMC Directive The performance specifications are nominal and conform to acceptable industry standards For application at conditions beyond these specifications consult the local Johnson Controls office Johnson Controls shall not be liable for damages resulting from misapplication or misuse of its products North American emissions compliance United States Th...

Страница 18: ... of single contact APAC Europe NA SA JOHNSON CONTROLS C O CONTROLS PRODUCT MANAGEMENT NO 32 CHANGJIJANG RD NEW DISTRICT WUXI JIANGSU PROVINCE 214028 CHINA JOHNSON CONTROLS WESTENDHOF 3 45143 ESSEN GERMANY JOHNSON CONTROLS 507 E MICHIGAN ST MILWAUKEE WI 53202 USA 2019 Johnson Controls All rights reserved All specifications and other information shown were current as of document revision and are sub...

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