Assessments - 2, GPA: 4
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4-OUT Terminal Terminal OUT controls unit defrost when connected to one side of the defrost relay coil. An internal relay connected to terminal OUT closes to allow external defrost relay to energize and initiate defrost. At the end of the defrost period, the internal relay connected to terminal OUT opens to de-energize the external defrost relay. 5-RST Terminal This terminal is not functional for the specified application. 6-Timing Pins (T1,T2,T3) Each of these pins provides a different timed interval between defrosts (30, 60 or 90 seconds). A jumper connects the pins to circuit board terminal Wl. To change the interval between defrosts, remove the jumper from the pin it is connected to and reconnect the jumper to one of the other available pins. A factory installed jumper on the circuit board connects terminal Wl on the circuit board to one of the three timing pins. 8-TST Pins Each board is equipped with a test pins for use in troubleshooting the unit. When jumpered together, these pins reduce the control timing to about 1/256 original time. A CAUTION To Place Control in Test Mode: 1-Turn off all power to avoid damaging the circuit board. 2-Make sure all control terminats are connected as shown on unit wiring diagram before attempting to place control in test mode. IMPORTANT 3-Connect jumper to "TST" pins, 4-Turn indoor thermostat to heat mode and adjust to highest temperature setting. 5-See table 1 for control timings in "TST" mode, 6-Turn on power to unit and re-adjust thermostat. Be sure to remove jumper when test is complete. TABLE 1 TEST MODE CONTROL TIMINGS NORMAL !_ 30+3 60±6 : 90_9 _ 14+1,4 OPERATION MIN MIN i MIN. MIN. "TST" PINS 1!7+0r7 14+1A i 21_+21 3-3_0.3 JUMPERED SEC. i SEC i SEC* i SEC TOGETHER ! Page 3 DEFROST CONTROL TROUBLESHOOTING FLOWCHART START HERE I Check control transformer primary and secondary voltages. Repair or replace as necessary. I Turn off power to unit. I Check defrost sensor. Is sensor temperature or pressure activated? For help in determining, refer to operation of control in unit installation instructions and unit wiring diagram. I I I Pressure Temperatu re I Is sensor making good contact with coil? Yes _ No I Repair or replace sensor bracket. Check all electrical connections at the defrost control. Defrost sensor and defrost relay. I Connect a jumper across the defrost relay. I Connect a jumper across the two "TST" pins on the delrost Control, I Turn indoor thermostat to heat mode and adjust to highest temperature setting. 1 Turn on power to unit. I Check voltage across "HLD" terminal and "COM" terminal, Is voltage 24 + 6VAC? 1 I I Yes ls solenoid engaging? Yes _t No i1 Replace reversing Replace solenoid. valve. Repeat Repeat troubleshoot- troubleshooting ing procedure, procedure. ................ .o___1 i 1 Is defrost control set for Is compressor contactor 30, 60 or 90 minute de = energized? frost intervals? i---No ................Yes I Check thermostat and thermostat widng. Repair or replace as necessary I Repeat troubleshooting procedure. Check circuit from "HLD" terminal back to thermostat, Repair or replace as necessary. Does un_ go into defrost t within appropriate time? I | Repeat troubleshooting Yes No _ procedure. i ] Unit is operating properly. Check voltage across "OUT" Turn off power to unit, terminal and "COM" terminal. Remove all test jumpers. Is voltage 24 ± 6VAC? Reassemble unit. Yes I Connect a jumper between "OUT" terminal and "COM" terminal. CAUTION-Be careful not to short "OUT" terminal to "24v" terminal, Permanent controt damage could result. I Does unit go immediately into defrost? Yes t No I Turn off power to unit. Check voltage across de- Remove all test jumpers. frost relay coil. Is voltage Replace defrost control with new 24 ± 6VAC? control board, Repeat troubleshooting procedure. I ["-_ Yes _ No Is defrost relay energized? I No Yes Check voltage across re= versing valve coil. Is voltage 24 . 6VAC? Check voltage across "24Y" terminal and "COM" terminal. Is I voltage 24 ± 6VAC? I No I NO ,,,, ,,,,,, _ ..... Yes II I Turn off power to unit. Turn off power to unit. Check and repair circuit Check circuit from defrost from reversing valve Turn off power to unit. switch back to control through defrost relay to Replace defrost relay, transformer. Repair of re- control transformer. Repeat troubleshooting place as necessary, Repeat troubleshooting procedure. Repeat troubleshooting procedure. procedure, Page 4 ...
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