After resetting the chiller and compressor starts, carefully watch your gauges.
#York model ycal xhiller sensors install#
Is the refrigeration system low on charge? A quick why to determine a low charge is to install a manifold gauge set on the high and low side of the refrigeration system. Make sure that NO stray wires from the micro are touching the case or any other wire connection on the back of the micro.ħ. If there is any excess wire shielding on the gray transducer cables showing, tape the area with black electrical tape. Make sure ALL wire connections on the back of the microprocessor are tight. These valves are shipped in the closed position from the factory.Ħ. If your chiller is equipped with a flooded condenser option, make sure both liquid refrigerant king valves entering and leaving the receiver are fully back seated � OPEN. * If your process requirements require settings lower that above, glycol freeze protection must be used to prevent Lo 1 trips and provide freeze protection.ĥ. Make sure your SP micro setting is no lower than 45F. Make sure your LP micro trip point is set at 54 PSI. If you have an ES,PAC system such filters and strainers must be cleaned, as they WILL cause low flow errors. On all chiller models, the factory recommends a filter or strainer on the FROM PROCESS loop line to prevent debris from entering the chiller. Before processing with any other steps, turn the power to the chiller off and clean the strainer. On PACT and EST systems with integrated water storage tanks a common problem is a plugged strainer located just above the tank recirculation pump discharge. Clean ALL filters and strainers: Restrictions to flow through the chillers cooling system WILL cause Lo 1 trips. On Single-phase chillers, if your pump is running the wrong direction, please call the factory for further instruction.Ģ. On THREE PHASE systems only, if your pump is spinning the wrong direction, STOP turn the main power OFF to the chiller and reverse any two legs of power on the main buss. You pump MUST be spinning the same direction. This arrow will indicate the design rotation. Located at the end of the pump there is an arrow embossed into the SS head of the pump. If the wire to end goes UP the pump is spinning CW and if DOWN CCW. When your wire tie makes contact with the plastic cooling fan the end will be forced up or down depending on the direction of spin. You can check for pump direction by CAREFULLY sliding a nylon wire tie through the air vent at the end of the pump housing. Make sure your pump is turning in the correct direction. Low-pressure trips should not happen provided the system is started up properly therefore further investigation is unusually needed.Ĭheck the following items BEFORE resetting from a Low Pressure trip:ġ. If that does not work, turn main supply power to the chiller OFF for one minute and then back on. First, by pressing the power button for 2-3 seconds.
For more information CLICK HEREĪ micro reset can be achieved in two ways. As a result, replacement parts for this process chiller control system are expected to run out in 2016.Īs of 1-1-2013, Legacy Chiller Systems has developed a retrofit package for the PSG process chiller control system.
On 12-31-15, PSG Controls (makers of chiller controls from 2000 to 2012 for both Legacy and Drake brand chillers) went out of business. The micro will then display the above faults and lock out the chillers cooling system(s). If at any time during a run cycle the micro sees low-side pressure below the LP set point for more than 90 seconds, the micro will lock out the chillers compressor until the micro is reset. Upon compressor start, the micro processes monitors the Suction or Low-Side pressure of the refrigeration system. After power up and compressor start, compressor stops before reaching the SP1 or SP2 set point and the micro processor indicated a �Lo 1� or “Lo 2” in the top screen, the trip pressure in the bottom screen and the low pressure indicator light on the micro is lit. Low pressure (Lo1 or lo2) error message on microprocessor controller.
#York model ycal xhiller sensors how to#
This article describes how to fix a chiller system that, after startup, has a stopped compressor and a low pressure error.