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If wall thermostat closes during this delay, TDR is reset and fan relay remains energized. TDR is a 24-v device that operates within a range of 15-v to 30-v and draws about 0.5 amps. If the blower runs continuously instead of cycling off when the fan switch is set on AUTO, the TDR is probably defective and must be replaced. XII. LOSS OF CHARGE SWITCH The loss of charge switch is located on the outdoor liquid line. This switch contains a Schrader core depressor. This switch opens at 7 psig and closes at 22 psig. No adjustment is necessary. NOTE: Because these switches are attached to refrigeration system under pressure, it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists. If switch must be removed, remove and recover all system charge so that pressure gauges read 0 psi. Never open system without breaking vacuum with dry nitrogen. XIII. CHECK DEFROST THERMOSTAT There is a liquid header with a brass distributor and feeder tube going into outdoor coil. At the end of 1 of the feeder tubes, there is a 3/8-in. OD stub tube approximately 3 in. long (See Fig. 36). The defrost thermostat should be located on this stub tube. Note that there is only 1 stub tube used with liquid header, and on most units it is the bottom circuit. XIV. DEFROST THERMOSTAT Defrost thermostat signals heat pump that conditions are right for defrost or that conditions have changed to terminate defrost. It is a thermally actuated switch clamped to outdoor coil to sense its temperature. Normal temperature range is closed at 30° +/-3°F and open at 80° +/-5°F. NOTE: The defrost thermostat must be located on the liquid side of the outdoor coil on the bottom circuit and as close to the coil as possible. TROUBLESHOOTING Refer to the Cooling and Heating Troubleshooting Chart (Table 11) for troubleshooting information. START-UP CHECKLIST Use the Start-Up Checklist to ensure proper start-up procedures are followed. —22— 689 100.0 (030) 60 Hz CHARGING CHART OUTDOOR TEMP F C 125 52 115 46 105 41 620S) 90.0 95 35 SCAL85 29 551KILOPA80.0(PSIG) 75 24 483SSURE (70.0ESSURE65 18 414E PRE60.0LINE PR55 13 345SUCTION LIN50.0CTION45 7 276 40.0 SU207 30.0 20.0 30.0 60.050.040.0 SUCTION LINE TEMPERATURE (DEG. F) 70.0 80.0 -7 -1 16104 SUCTION LINE TEMPERATURE (DEG. C) 21 27 50JX500220 C99032 Fig. 29—Cooling Charging Chart, 602A 030 Units 689 100.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 207 276 345 414 483 551 620SUCTION LINE PRESSURE (KILOPASCALS) SUCTION LINE PRESSURE (PSIG) 20.0 -7 272116104-1 80.070.060.050.040.030.0 50JX500221 (036) 60 Hz CHARGING CHART OUTDOOR TEMP F C 125 52 115 46 105 41 95 35 85 29 75 24 65 18 55 13 45 7 SUCTION LINE TEMPERATURE (DEG. C) SUCTION LINE TEMPERATURE (DEG. F) C99033 Fig. 30—Cooling Charging Chart, 602A 036 Units 689 100.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 207 276 345 414 483 551 620SUCTION LINE PRESSURE (KILOPASCALS) SUCTION LINE PRESSURE (PSIG) 20.0 -7 272116104-1 80.070.060.050.040.030.0 50JX500222 (042) 60 Hz CHARGING CHART OUTDOOR TEMP F C 125 52 115 46 105 41 95 35 85 29 75 24 65 18 55 13 45 7 SUCTION LINE TEMPERATURE (DEG. C) SUCTION LINE TEMPERATURE (DEG. F) C99034 Fig. 31—Cooling Charging Chart, 602A 042 Units SUCTION LINE TEMPERATURE (DEG. F) 689 100.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 207 276 345 414 483 551 620SUCTION LINE PRESSURE (KILOPASCALS) SUCTION LINE PRESSURE (PSIG) 20.0 -7 272116104-1 80.070.060.050.040.030.0 50JX500223 (048) 60 Hz CHARGING CHART OUTDOOR TEMP F C 125 52 115 46 105 41 95 35 85 29 75 24 65 18 55 13 45 7 SUCTION LINE TEMPERATURE (DEG. C) C99035 Fig. 32—Cooling Charging Chart, 602A 048 Units 689 100.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 207 276 345 414 483 551 620SUCTION LINE PRESSURE (KILOPASCALS) SUCTION LINE PRESSURE (PSIG) 20.0 -7 272116104-1 SUCTION LINE TEMPERATURE (DEG. C) 80.070.060.050.040.030.0 SUCTION LINE TEMPERATURE (DEG. F) 50JX500224 (060) 60 Hz CHARGING CHART OUTDOOR TEMP F C 125 52 115 46 105 41 95 35 85 29 75 24 65 18 55 13 45 7 C99036 Fig. 33—Cooling Charging Chart, 602A 060 Units —23— TABLE 9—FILTER PRESSURE DROP (IN. WG) FILTER SIZE CFM 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 20 X 20 X 1 0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15 — — — — — — — — — — — 20 X 24 X 1 — — — — 0.09 0.10 0.11 0.13 0.14 0.15 0.16 — — — — — — — — 24 X 30 X 1 — — — — — — — 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16 0.17 0.18 TABLE 10—ELECTRIC HEAT PRESSURE DROP TABLE SMALL CABINET STATIC CFM 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 5kW 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 10 kW 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 0.09 0.10 0.11 15 kW 0.00 0.00 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 20 kW 0.00 0.00 0.02 0.04 0.06 0.08 0.09 0.11 0.13 0.15 0.17 0.19 LARGE CABINET STATIC CFM 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 5kW 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 10 kW 0.00 ...

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