Carrier 50YDV Installation, Operation And Maintenance Instructions

Carrier 50YDV Installation, Operation And Maintenance Instructions Manual pdf 35 page image

35R e s i d e n t i a l P a c k a g e d U n i t s - 6 0 H z P u r o n ®R e v. : 4 J a n . , 2 0 1 2Note: If performance during any mode appears abnormal,refer to the CXM section or troubleshooting section of thismanual. To obtain maximum performance, the air coil shouldbe cleaned before start-up. A 10% solution of dishwasherdetergent and water is recommended.Unit Start-Up Procedureblocked line. Check that the condensate trap is filledto provide a water seal.e. Refer to Table 10. Check the temperature of bothentering and leaving water. If temperature is withinrange, proceed with the test. If temperature is outsideof the operating range, check refrigerant pressuresand compare to Tables 11 through 12. Verify correctwater fl ow by comparing unit pressure drop acrossthe heat exchanger versus the data in Tables 9athrough 9b. Heat of rejection (HR) can be calculatedand compared to catalog data capacity pages. Theformula for HR for systems with water is as follows:HR = TD x GPM x 500, where TD is the temperaturedifference between the entering and leaving water,and GPM is the flow rate in U.S. GPM, determinedby comparing the pressure drop across the heatexchanger to Tables 9a through 9b.f. Check air temperature drop across the air coil whencompressor is operating. Air temperature drop shouldbe between 15°F and 25°F [8°C and 14°C].g. Turn thermostat to “OFF” position. A hissing noiseindicates proper functioning of the reversing valve.6. Allow five (5) minutes between tests for pressure toequalize before beginning heating test.a. Adjust the thermostat to the lowest setting. Place thethermostat mode switch in the “HEAT” position.b. Slowly raise the thermostat to a higher temperatureuntil the compressor activates.c. Check for warm air delivery within a few minutes afterthe unit has begun to operate.d. Refer to Table 10. Check the temperature of bothentering and leaving water. If temperature is withinrange, proceed with the test. If temperature is outsideof the operating range, check refrigerant pressuresand compare to Tables 11 through 12. Verify correctwater fl ow by comparing unit pressure drop acrossthe heat exchanger versus the data in Tables 9athrough 9b. Heat of extraction (HE) can be calculatedand compared to submittal data capacity pages. Theformula for HE for systems with water is as follows:HE = TD x GPM x 500, where TD is the temperaturedifference between the entering and leaving water,and GPM is the flow rate in U.S. GPM, determinedby comparing the pressure drop across the heatexchanger to Tables 9a through 9b.e. Check air temperature rise across the air coil whencompressor is operating. Air temperature rise shouldbe between 20°F and 30°F [11°C and 17°C].f. Check for vibration, noise, and water leaks.7. If unit fails to operate, perform troubleshooting analysis(see troubleshooting section). If the check describedfails to reveal the problem and the unit still does notoperate, contact a trained service technician to insureproper diagnosis and repair of the equipment.8. When testing is complete, set system to maintaindesired comfort level.9. BE CERTAIN TO FILL OUT AND RETURN ALLWARRANTY REGISTRATION PAPERWORK.ѥ WARNING! ѥѥ CAUTION! ѥWARNING! When the disconnect switch is closed, highvoltage is present in some areas of the electrical panel.Exercise caution when working with energized equipment.CAUTION! Verify that ALL water control valves are openand allow water flow prior to engaging the compressor.Freezing of the coax or water lines can permanentlydamage the heat pump.