Solution: Check the cool water circuit and refill cool water to rated volume or wait for cool load rise. Reason: It may be cool water not enough or cool load low Solution: Change the core of oil filter or tighten the oil pressure adjusting valve so that the oil pressure rise to rated pressure or disassembly to check or change the bearing or check oil pressure meter, reset the pressure sensor and change it when necessary or do apply the oil heater when cooler stops to maintain rated oil temperature (check if wire of oil heater is breaking, and if the set temperature for oil heater to heat is correct). Reason: It may be oil filter blocked or oil pressure adjusting valve (gate gurgle valve) opened too wide or outlet oil at oil pump decreased or bearing abrades or failure occurred at oil pressure meter (or sensor) or too many refrigerant mixed into lubricating oil (oil pressure is too low for oil bubbles when starting). What to do when the difference of oil pressure is too low? to lower (or rise) the temperature of cool water to rated temperature as soon as possible or get rid of non condensed gas or clean the tube. Solution: Check the cool water circuit and adjust it to rated current flow or check cooling tower and expand throttle etc. Reason: It may be cooling water not enough or capacity of cooling tower reduced or temperature of cool water too high or cooling capacity too high to increase the load at condenser or non condensed gas exist or heat transfer at condensing tube bad for the pollution like furring. What to do when condensing pressure is too high? Solution: Check the cool water circuit and refill the cool water to rated volume or check the rated temperature at auto on/off device or check if expand throttle is blocked or clean the heat transfer tube or fill the refrigerant to needed volume. Reason: It may be cool water not enough or cool load low or failure occurred at throttle orifice or heat transfer at heat transfer tube of evaporator bad for the pollution like furring or lack of refrigerant. What to do when evaporating pressure is too low?

Delta air conditioner control panel