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If pressure and temperature do not match on chart, system refrigerant charge may not be correct. Do not use chart to adjust refrigerant charge. NOTE: When charging is necessary during heating season, charge must be weighed in accordance with unit rating plate ±0.6 ounces per foot of a inch liquid line above or below 15 feet respectively. 506 01 5001 00 INSTALLATION INSTRUCTIONS 3-phase R-22 Split System Heat Pump Figure 16 R-22 Required Liquid Line Temperature (°F) - Cooling Mode Measured Liquid Pressure (psig) Rating Plate (required) Subcooling Temperature (°F) 5 10 15 20 Measured Liquid Pressure (psig) Rating Plate (required) Subcooling Temperature (°F) 5 10 15 20 134 71 66 61 56 233 107 102 97 92 141 74 69 64 59 243 110 105 100 95 148 77 72 67 62 253 113 108 103 98 156 80 75 70 65 264 116 111 106 101 163 83 78 73 68 274 119 114 109 104 171 86 81 76 71 285 122 117 112 107 179 89 84 79 74 297 125 120 115 110 187 92 87 82 77 309 128 123 118 113 196 95 90 85 80 321 131 126 121 116 205 98 93 88 83 331 134 129 124 119 214 101 96 91 86 346 137 132 127 122 223 104 99 94 89 359 140 135 130 125 SEQUENCE OF OPERATION A. COOLING MODE On a call for cooling, the thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O energizes reversing valve, switching it to cooling position. Circuit R-Y energizes contactor, starting outdoor fan motor and compressor. Circuit R-G energizes indoor unit blower relay, starting indoor blower motor. When thermostat is satisfied, its contacts open, de-energizing contactor and blower relay. Compressor and motors stop. NOTE: If indoor unit is equipped with a time-delay relay circuit, the blower runs an additional length of time to increase system efficiency. (Applies to both cooling and heating modes.) NOTE: Low ambient cooling feature allows unit to operate safely in cooling mode down to 0 F outdoor ambient. B. HEATING MODE On a call for heating, the thermostat makes circuits R-Y and R-G (circuit R-O is NOT made, and the reversing valve stays in the de-energized, heating position). Circuit R-Y energizes contactor, starting outdoor fan motor and compressor. Circuit R-G energizes indoor blower relay, starting blower motor. If the room temperature continues to fall, circuit R-W2 is made through the second-stage room thermostat bulb. Circuit R-W2 energizes a sequencer, bringing on the first bank supplemental electric heat and providing electrical potential to the second heater sequencer (if used). If outdoor temperature falls below the setting of the outdoor thermostat (field-installed option), contacts close to complete the circuit and bring on the second bank of supplemental electric heat. When the thermostat is satisfied, its contacts open, de-energizing contactor, blower relay, and sequencer. Compressor, motors, and heaters stop. 506 01 5001 00 INSTALLATION INSTRUCTIONS 3-phase R-22 Split System Heat Pump TROUBLESHOOTING Some models are factory equipped with the Comfort Alert Diagnostics device in the control box (refer to Figure 17). Comfort Alert provides around-the-clock monitoring for common electrical problems, compressor defects, and broad system faults. If trouble is detected, an alert code is displayed with a flashing LED indicator. NOTE: Comfort Alert is required for unit operation. Comfort Alert provides active safety protection and compressor may be shut down. Alert codes are listed in Figures 18 and 19. Comfort Alert is factory wired and requires no modification. Low voltage lead wires are provided in the control box for connection to thermostat wires (use wire nuts). The Comfort Alert device operates by monitoring the compressor power leads and the thermostat demand signal (Y terminal). It draws constant 24 VAC power at the R and C terminals. MAINTENANCE Figure 17 Comfort Alert Diagnostics (some models) POWER LED Second Stage Compressor Signal First Stage Compressor Signal 24 VAC for Thermostat Indicator 24 Volt Power 24 Volt Common 24 Volt Compressor Protection Function DC Compressor Solenoid ALERT LED TRIP LED DC SOL Compressor Wires Pass Through Holes (3) DATA PORT Y L R C P Y2 Condensate Drain During the cooling season, check monthly for free flow of drainage and clean if necessary. Cleanliness These tips will help keep the air conditioner looking better and working more efficiently: 1. Free flow of air is essential. Keep fences, shrubs, trash cans, and other obstructions at least 18 inches from all coil inlets. 2. Keep the coil free of grass clippings, leaves, weeds, and other debris. NOTE: Coil may occasionally require cleaning with a liquid solution. The coil must be cold when cleaning. Use an alkaline based cleaner only. Cleaning a hot coil or using an acid based cleaner will remove the paint from the fins and may clog the coil. 3. Never use a weather cover over the outdoor unit unless it is a ventilated type or made of breathable fabric that will allow moisture to evaporate rapidly. A cover that holds moisture in the unit will cause more rust build-up and damage than n...

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