York CZH Installation Manual

Also see for AC6B SERIES: Installation manual User's information manual User's information manual

835965-UIM-C-081418 Johnson Controls Unitary Products3. If the coil needs to be cleaned, use clean water to wash dust, dirt,and debris from outdoor condensing coil.4. Refer to the furnace or air handler instructions for filter and blowermotor maintenance.5. The indoor coil and drain pan should be inspected and cleaned reg-ularly to prevent odors and assure proper drainage.SECTION VIII: AC CONTROL BOARDFUNCTIONALITYANIT-SHORT CYCLE DELAYThe control includes a five-minute anti-short cycle delay (ASCD) timerto prevent the compressor from short cycling after a power interruptionor thermostat signal interruption. The ASCD timer is applied when thecontrol is first powered from the indoor unit thermostat and immediatelyfollowing the completion of a compressor run cycle. The compressorand the outdoor fan will not operate during the five minutes that thetimer is active.The ASCD timer can be bypassed by connecting the TEST terminalsfor three seconds while the thermostat is calling for compressor opera-tion (Y1 input signal energized).LOW VOLTAGE DETECTIONThe control monitors the transformer secondary (24 VAC) voltage andprovides low voltage protection for the AC unit and its components. Inparticular, the control prevents contactor chatter during low voltage con-ditions. If the voltage drops below approximately 19 VAC, the controlwill continue to energize any relays that are already energized but willnot energize any additional relays until the voltage level increases. Ifthe voltage drops below approximately 16 VAC, the control will immedi-ately de-energize the relay outputs and will not energize any relays untilthe voltage level increases. The control will store and display the appro-priate fault codes when low voltage conditions occur.TEST INPUTThe control includes a TEST input connector that can be used for vari-ous testing functions during installation and service. Table 2 summa-rizes the behavior of the control when the two TEST pins areconnected.On 5 Ton unit the outdoor fan motor is a permanent magnet DCbrushless type. The motor requires a separate Electronic Control tooperate. Do not attempt to replace this motor with a typical PSCtype. Damage to Electronic Control may result.DO NOT use coil cleaners to clean outdoor condensing coil. clean-ers containing HF-, hydroxides, chlorides, and sulfates can greatlyreduce the lifetime of the aluminum condensing coil.NOTICENOTICEDo not connect manifold gauges unless trouble is suspected.Approximately 3/4 ounce of refrigerant will be lost each time a stan-dard manifold gauge is connected.IT IS UNLAWFUL TO KNOWINGLY VENT, RELEASE OR DIS-CHARGE REFRIGERANT INTO THE OPEN AIR DURINGREPAIR, SERVICE, MAINTENANCE OR THE FINAL DISPOSALOF THIS UNIT.WHEN THE SYSTEM IS FUNCTIONING PROPERLY AND THEOWNER HAS BEEN FULLY INSTRUCTED, SECURE THEOWNER’S APPROVAL.TABLE 1: R-410A Saturation PropertiesTEMP. °F PRESSUREPSIG TEMP. °F PRESSUREPSIG TEMP. °F PRESSUREPSIG TEMP. °F PRESSUREPSIG TEMP. °F PRESSUREPSIG45 129.70 60 169.60 75 217.40 90 274.10 105 340.5046 132.20 61 172.60 76 220.90 91 278.20 106 345.3047 134.60 62 175.50 77 224.40 92 282.30 107 350.1048 137.10 63 178.50 78 228.00 93 286.50 108 355.0049 139.60 64 181.60 79 231.60 94 290.80 109 360.0050 142.20 65 184.60 80 235.30 95 295.10 110 365.0051 144.80 66 187.70 81 239.00 96 299.40 111 370.0052 147.40 67 190.90 82 242.70 97 303.80 112 375.1053 150.10 68 194.10 83 246.50 98 308.20 113 380.2054 152.80 69 197.30 84 250.30 99 312.70 114 385.4055 155.50 70 200.60 85 254.10 100 317.20 115 390.7056 158.20 71 203.90 86 258.00 101 321.80 116 396.0057 161.00 72 207.20 87 262.00 102 326.40 117 401.3058 163.90 73 210.60 88 266.00 103 331.00 118 406.7059 166.70 74 214.00 89 270.00 104 335.70 119 412.20