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Фрагмент инструкции
If the defrost thermostat contacts are closed, the unit defrosts. The defrost timer limits defrosting period to 10 minutes. Normally the frost is removed and the defrost thermostat contacts will open to terminate defrosting before 10 minutes have elapsed. Defrost thermostat contacts open at 80 ± 6 F. When defrosting is terminated, the outdoor fan motor is energized and reversing valve solenoid is de-energized, returning unit to heating cycle. The 90-minute period to check for defrost can be changed to 50 or 30 minutes by moving a jumper wire on the defrost printed-circuit board. HEAT PUMP CIRCUITS shown in Fig. 10 are refrigerant flow diagrams for heating and cooling cycles. Refrigerant Charging A WARNING Avoid contact with hot gas discharge line to prevent a burn when working on compressor. Before installing or servicing unit, turn off main power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause personal injury or death. COOLING STRAINERS HEATING COOLING STRAINERS HEATING HEATING CYCLE COOLING CYCLE Fig. 10—Refrigerant Flow Diagrams Table 5—Service Data MODEL 50QQ 018 024 030 036 042 048 060 R-22 CHARGE* (lb) 7 lbs 4 oz 6 lbs 8 oz 8 lbs 0 oz 7 lbs 4 oz 8 lbs 12 oz 9 lbs 0 oz 9 lbs 0 oz Piston Htg/clg. 52/42 61/49 67/32 76/63 78/70 82/73 93/84 INDOOR FAN Centrifugal—Direct Drive Rpm 840 840 1100 1100 Diameter (in.) 10 12 Width (in.) 6 6 Range (cfm) 525-750 700-1000 875-1250 1020-1450 1170-1670 1340-1920 1690-2420 Motor Hp % 1/3 'h % "V2 % % OUTDOOR FAN Propeller—Direct Drive Cfm 2200 2200 2200 2700 3200 3200 3400 Rpm 840 840 840 1100 1100 1100 1100 Diameter (in.) 22 22 22 22 22 22 22 Motor Hp % 'L V'. 74 1A ’A I2 *Factory refrigerant charge A WARNING To prevent personal injury, wear safety glasses and gloves when handling refrigerant. Do not overcharge system. An overcharge can cause compressor flooding. Unit refrigerant system is factory charged. When recharging is necessary, weigh in total charge indicated in Table 5. (Charge must be weighed in during heating season.) Remove any refrigerant remaining in system before recharging. If system has lost complete charge, evacuate system to 5000 microns (29.7-in. vacuum) before recharging. Schrader fitting connections are provided on unit suction and discharge lines for evacuation and charging. (See Fig. 12 for Schrader fitting location.) Volumetric charging device is an accurate device used to recharge systems by weight. These cylinders are available at refrigeration supply firms. CHARGING AND ADJUSTING REFRIGERANT CHARGE NOTE: Check refrigerant charge in cooling mode when outdoor temperature is above 65 F. Check charge in heating mode when temperature is below 65 F. If charge must be checked in opposite mode, do not operate unit continually for more than 10 minutes or damage to compressor may result. Refrigerant system is fully charged with R-22 refrigerant, tested, and factory sealed. For more applications, factory charge is the correct amount for best performance; however, this charge may require a slight adjustment to attain rated performance. NOTE: Adjustment of refrigerant charge is not required unless unit is suspected of not having proper R-22 charge. A CAUTION When evaluating refrigerant charge, an indicated adjustment to specified factory charge must always be very minimal. If a substantial adjustment is indicated, an abnormal condition exists somewhere in system, such as insufficient airflow across either or both coils. Heating Mode 1. Remove gage port caps from both service valves and attach gage manifold. Use hoses with valve core depressors. 9 A Table 6—Field Charging Table—Fixed Restrictor HEATING OPERATING PRESSURES PSIG (Pressures at High and Low Side Service Ports) MODEL INDOOR OUTDOOR TEMPERATURE (F) DRY BULB 50QQ DRY BULB (F) 60 50 40 30 20 10 0 -10 65 High 217 202 189 178 168 157 149 140 Low 77.2 65 53.8 43.7 34.7 26.8 19.7 12.6 018 70 High 232 217 203 192 181 169 158 147 Low 77.8 65.4 54.2 44 35 27 19.8 12.9 75 High 248 232 218 205 195 184 174 165 Low 78.4 65.9 54.9 44.4 35.2 27.3 21.1 13.2 65 High 219 204 191 179 171 161 150 139 Low 72.1 60.4 50.2 40.8 32.5 25.1 18.4 11.7 024 70 High 235 219 205 194 183 174 164 154 Low 72.6 60.9 50.5 41.2 32.9 25.4 18.7 12 75 High 251 235 221 209 196 185 176 165 Low 73.2 61.4 51 41.6 33.2 25.6 18.9 12.1 65 High 219 203 190 179 168 153 150 141 Low 70.5 58.9 48.7 39.8 31.9 24.7 18.1 11.6 030 70 High 235 219 205 195 184 170 158 145 Low 71.1 59.4 49.2 40.2 32.2 24.9 18.3 11.7 75 High 250 235 222 208 196 186 176 167 Low 71.5 59.9 49.7 40.6 32.5 25.2 18.6 11.9 65 High 218 202 190 180 172 161 152 142 Low 70.9 59.1 48.8 39.8 31.9 24.6 18.1 11.6 036 70 High 231 216 202 192 186 174 163 153 Low 71.4 59.6 49.3 40.1 32.2 24.9 18.3 11.7 75 High 246 230 216 205 198 187 178 169 Low 72 60.1 49.7 40.5 32.5 25.2 1...