York YXV series Installation Manual

5284792-UIM-A-0317Johnson Controls Unitary Products 9TOTAL SYSTEM CHARGE DETERMINED1. Determine outdoor unit factory charge from Tabular Data Sheet.2. Determine indoor coil adjustment (if any) from Tabular Data Sheet.3. Calculate the additional charge for refrigerant piping using the Tabu-lar Data Sheet if line length is greater than 15 feet (4.6 m).4. Total system charge = item 1 + item 2 + item 3.5. The manifold gauge set is already installed on the unit for evacua-tion and charging. Use these gauges to initially charge the systemusing system pressures and subcooling. You will find the charginginformation printed on the bottom of the unit data tag. More charginginformation is available in the “Service Data Application Guide”,available online. For subsequent annual maintenance visits thecharge verification display can be used to quickly check overall sys-tem condition and the system charge without attaching a separatemanifold gauge set or temperature sensors.6. Permanently mark the unit data plate with the total amount of refrig-erant in the system.CHARGE VERIFICATION MODEThe outdoor display will assist the installer with charging the system.Through interaction with the Outdoor Display the system will operate atpredetermined nominal speed values. During this operation the systemwill monitor pressures and temperatures. When the subcooling is withinthe predetermined values set by the OEM, the outdoor display will indi-cate SYSTEM CHARGE VALIDATED. This mode is only availablewhen the ID temperature is within 73 to 83°F and humidity is less than73% as measured by the Hx TM thermostat. Operation will continue butcharge will not be verified.User Interaction/Operation:1. Press Menu, press Arrow until Modes is displayed, press Select.Press Arrow until Charge Verification is displayed, press Select.2. Press Select while in Charge Verification Mode. The system willdetect the Unit Type and Unit Tonnage. The outdoor display willupdate and scroll text, see the example below.Example: 4-TON AC FOUND * VERIFY CHARGE? * 4-TON ACFOUND * VERIFY CHARGE?3. Press Select to verify charge, the outdoor display will update andscroll text, see the example below.Example: VERIFYING CHARGE * PLEASE WAIT * VERIFYINGCHARGE * PLEASE WAIT(5 minute wait time during initial charge calculation)4. ADD CHARGE or REMOVE CHARGE will display on the bannerwith the appropriate response dependent upon the OEM's predeter-mined values, user may press Select when the banner displaysADD CHARGE or REMOVE CHARGE. The display will indicateACCEPTED for 5 seconds and return to the example defined inStep 1. However, if the system does meet the charge requirementsdefined by the OEM, the outdoor display will indicate the below textexample for 5 seconds and return to the text example in Step 2 untilcharge verification has fully completed.Example: SYSTEM CHARGE VALIDATEDThe system will repeat steps 1-3 until the subcooling has reached thepredetermined values set by the OEM.5. Once charge verification is fully complete the outdoor display willreturn to the Second Menu Layer.SECTION VII: SYSTEM OPERATIONANTI SHORT-CYCLE DELAYThe control includes a five-minute anti short-cycle delay (ASCD) timerto prevent the compressor from short-cycling after a power or thermo-stat signal interruption. The ASCD timer is applied when the control isfirst powered and immediately following the completion of a compressorrun cycle. The compressor and the outdoor fan will not operate duringthe five minutes that the timer is active.LOW VOLTAGE DETECTIONThe control monitors the outdoor transformer secondary (24 VAC) volt-age and provides low voltage protection for the heat pump and its com-ponents. If the voltage drops below approximately 22 VAC, the controlcontinues to energize any outputs that are already energized. If the volt-age drops below approximately 19 VAC, the control immediately de-energizes the outputs and can no longer energize any outputs until thevoltage level increases above 22VAC. The control stores and displaysthe appropriate fault codes when low voltage conditions occur.TEST MODE OPERATIONTest mode operation provides the features found in Table 3 to assists inunit commissioning and troubleshooting. TEST MODE is accessedthrough the Outdoor Display. Please see Page 11 for detailed OutdoorDisplay operation.WARNINGDO NOT attempt to pump “Total System Charge” into outdoor unit formaintenance, service, etc. This may cause damage to the compres-sor and/or other components. Recover and weigh “System Charge”into an appropriate recovery cylinder for any instances requiringevacuation.CAUTIONIt is unlawful to knowingly vent, release or discharge refrigerant intothe open air during repair, service, maintenance or the final disposalof this unit.FIGURE 10: Main Outdoor Control and Display!!67$786)$8/76'5&2<