| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that either a plurality of motors for cooling fans or a motor for a cooling water pump is not operated if any one phase of a three-phase AC power source is interrupted due to some cause in an engine heat pump, an outdoor unit does not demonstrate any original function thereof, and the entire engine heat pump fails. SOLUTION: The engine heat pump in which a cooling fan of a heat exchanger and a cooling water pump to discharge engine cooling are connected to the three-phase AC power source in the outdoor unit comprises a three-phase zero cross point detecting means in the three-phase AC power source, a means to determine and display the phase interruption when detecting only one phase cross point, and a means to determine and display the negative phase if the cross-point detected phase order is reverse. |
