Assessments - 5, GPA: 3.4
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Risk of Electrical Shock… Ensure all electrical power to the heater has been disconnected prior to removing the heater front access panel. Leave electrical power disconnected throughout the following jumper repositioning procedure. 1. To access the jumper, disconnect electrical power and remove the heater front entry panel; then, remove the metal cover from heater electrical enclosure. For layout details of the PC control board, see figures on next page. 2. Locate the mode jumper in the upper right hand corner of the PC control board; per the figures on the following page, identify the correct location for the jumper. If the jumper is found to be incorrectly positioned, gently disengage the jumper by pulling it directly away from the control board. 3. Correctly reposition the jumper, leaving one pin uncovered. Note: The jumper should cover two (2) pins: one always being the middle pin, and the other the correct pin for the features of the heat pump. Controls Configuration & Adjustments... Microprocessor Mode Jumper Positioning... continued: Controls Configuration & Adjustments... Defrost Systems- Described DEFROST CYCLE (HEAT ONLY UNITS): The microprocessor controller monitors the heater’s air-coil temperature, minimizing air-coil freeze- up during cooler weather conditions. If the controller senses air-coil temperatures conductive to making ice, the heater’s compressor operation is interrupted while the fan is allowed to continue in operation. With the compressor off, the air-coil begins to warm to the surrounding air temperature. When air-coil temperatures rise above approximately 38oF, the compressor is restarted and heating resumes. In the event air temperatures remain below approximately 38oF, the compressor will remain off until the air temperature rises above 38oF. The unit will not heat the water as long as the compressor remains off. During defrost cycles, when the controller has stopped compressor operation, the display will read: [FS]. DEFROST CYCLE (HEAT & COOL UNITS): The microprocessor controller, in conjunction with the defrost sensor, constantly monitors the heater’s evaporator (air-coil) temperature. Should the controller sense ice or frost has formed on the evaporator, sufficient in amount as to affect the heater’s performance, an active defrost cycle (more below) is initiated. Before initiating a defrost command, the controller defrost logic looks at both the air-coil temperature, and the length of time the coil has remained at an ice-making temperature. Active defrost involves using hot refrigerant gas, from the compressor, to rapidly remove ice or frost from the evaporator coil. In practice, during a hot gas defrost cycle, valving, internal within the refrigerant system, reverses the flow of the refrigerant; this reversal of flow temporarily makes the air-coil the condenser. During hot gas defrost, the air-coil warms very quickly, and accumulated ice and frost is rapidly melted. Under most conditions the evaporator will be completely cleared in under 5-minutes. HEAT & COOL DEFROST SEQUENCE DETAILS: • When the controller senses air-coil temperatures conductive to making ice, the unit will enter a 50-minute defrost delay (counting) period. • During the counting period, the fan and compressor will continue to operate, and the water will continue to be heated. During the counting period it is normal to see a moderate amount of frost and ice formation on the air coil. • If, after the 50-minute counting period, the controller senses a need to defrost: 1. The refrigerant circuit reversing valve will be activated, changing the flow of hot refrigerant gas from the pool water heat exchanger to the air-coil. 2. Fan operation will be suspended, permitting maximum heating of the air-coil. 3. The reverse cycle will continue until either: A. The air-coil attains a predetermined temperature (indicative of total defrost), or; B. Until 10-minutes have elapsed (regardless of total defrost having occurred). • During hot gas defrost cycles, the compressor will not deactivate; rather, the compressor will continue operation throughout the sequence. Upon completion of the defrost cycle (as terminated per “A” or “B,” above), the reversing valve will be deactivated, fan operation will recommence, and water heating will resume. Controls Configuration & Adjustments... Water Flow (Pressure) Switch Adjustment Occasionally, plumbing system design features will create a situation whereas the heater will abnormally cycle on the water flow circuit. This situation will be evident if the circulator pump is operating, the filter is clean, and all water valves are set to flow water through the heater– but the error code: “FLO” remains displayed (or displays intermittently). In these rare instances where the factory water pressure switch (WPS) setting will not satisfy site conditions, a WPS adjustment, to enable normal heater operation, is possible. Failure to heed the following may result in permanent injury or death.WARNIN...
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