York THGD Series Installation Manual

Contents

York THGD Series Installation Manual Manual pdf 9 page image

835961-UIM-D-0213Johnson Controls Unitary Products 9SECTION IX: SYSTEM START-UPENERGIZE CRANKCASE HEATERIf this unit is equipped with a crankcase heater for the compressor, awarning label with an adhesive back is supplied in the unit installationinstruction packet. This label should be attached to the field supplieddisconnect switch where it will be easily seen.In order to energize the crankcase heater, set the indoor cooling ther-mostat to the OFF position. Close the line power disconnect to the unit.WITH POWER TO UNIT AND THERMOSTAT IN COOLINGPOSITION:1. In the cooling cycle, discharge gas is pumped to the outdoor coilwhich is the condenser. The indoor coil is the evaporator.2. If fan switch is in ON position, a circuit is made through blower relayto provide continuous blower operation.3. With fan switch in AUTO position, a circuit is made from thermostatcooling contact through blower relay to provide blower operation.4. System will cycle with thermostat demand to provide cooling asneeded.An attempt to start the compressor without at least 8 hours of crank-case heat will damage the compressor.TABLE 1: R-410A Saturation PropertiesTemp °F PressurePSIG Temp °F PressurePSIG Temp °F PressurePSIG Temp °F PressurePSIG Temp °F PressurePSIG45 130 60 170 75 217 90 274 105 34146 132 61 173 76 221 91 278 106 34547 135 62 176 77 224 92 282 107 35048 137 63 179 78 228 93 287 108 35549 140 64 182 79 232 94 291 109 36050 142 65 185 80 235 95 295 110 36551 145 66 188 81 239 96 299 111 37052 147 67 191 82 243 97 304 112 37553 150 68 194 83 247 98 308 113 38054 153 69 197 84 250 99 313 114 38555 156 70 201 85 254 100 317 115 39156 158 71 204 86 258 101 322 116 39657 161 72 207 87 262 102 326. 117 40158 164 73 211 88 266 103 331 118 40759 167 74 214 89 270 104 336 119 412FIGURE 10: Heat Pump Flow DiagramCHARGE COMPENSATOR(Empty in cooling / full in heating)(Not included in all Units)FIELD CONNECTED LINE INDOOR COILOUTDOORCOIL4-WAYREVERSINGVALVEFILTER DRYER(Solid core)SUCTIONACCUMULATORLIQUIDSENSORCOMPRESSORBI-FLOWTXV/CHECKVALVE (Cooling) **BI-FLOWTXV/CHECKVALVE OR ORIFICE (Heating)