IV–77L16 Faulty Water Heat Exchanger Unit Settings* Only detected when the water heat exchanger unit is connected.Re-check the settings if it is not the relevant model.c Error detection methodAn error is determined in accordance with the criteria shown below the first time the settings on the water heatexchanger unit’s control board are incorrect.• When the temperature during heating with SW4 and 5 is outside of the temperature setting.• When the temperature during cooling (water) with SW1 to 3 is outside of the temperature setting.• When the temperature during cooling (brine) with SW1 to 3 is outside of the temperature setting.• When the setting for the anti-icing control switch with SW8-1 is incorrect.d Troubleshooting1Set temperaturecheck duringheating1-1 Are the settings for SW4 and SW5 between 35°C and55°C?Yes 2-1No Revise settings2Set temperaturecheck duringcooling (water)2-1 Is it used as a water chiller? Yes 2-2No 3-12-2 Is SW1-2 set at OFF?Yes 2-3No Proceed to 2-3 afterchanging to OFF2-3 Is SW1-3 set at OFF?Yes 2-4No Proceed to 2-4 afterchanging to OFF2-4Are the settings for SW2 and SW3 between 5°C and 15°C?(If the answer is “No” for either 2-2 or 2-3, diagnostics willend even if 2-4 is “Yes.”)Yes 4-1No Revise settings3Set temperaturecheck duringcooling (brine)3-1 Is SW1-2 set at ON?Yes 2-2No Proceed to 2-2 afterchanging to ON3-2Are the settings for SW1, SW2 and SW3 between -15°Cand 15°C? (If the answer is “No” for 3-1, diagnostics willend even if 3-2 is “Yes.”)Yes 4-2No Revise settings4Anti-icingcontrol switchsetting check4-1 Is SW8-1 set at OFF? OK 5-1NG Change to OFF4-2 Is SW8-1 set at ON? OK 5-1NG Change to ON5Miscellaneous 5-1Momentarily reverse (switch to the opposite sides) all dipswitches (SW1-2. SW1-3, SW1-8) and then try returningthem to their previous positions. Has the problem beensolved?Yes End diagnosticsNo 5-25-2Move the position of the rotary switches (SW2 to 5) aroundat random, and then try returning them to within the setrange. Has the problem been solved?Yes End diagnosticsNo Replace the controlboard● For details on the procedures for replacing the water heat exchanger unit’s control board, see Chapter 5“Reference Document.”● For details on board and electrical wiring diagrams, see Chapter 6.● 1-1Set SW4 at tens place and SW5 at ones place. The set temperature range is between +35°C and +55°C.(Example: If SW2 is set at “4” and SW3 at “5”, the set temperature is “+45°C”.)
