Check for electronic expansion valve (EXV) functionality through the controller.
Your chiller's (e.g., ALS 125, ALS 300) Current suction and discharge pressures
Calibrate pressure transducers and thermistors against certified gauges. 🎛️ MicroTech Controller Diagnostics mcquay als chillers service manual
However, their complexity—featuring multiple refrigerant circuits, electronic expansion valves, and sophisticated logic—means that seat-of-the-pants repairs are impossible. This is where the becomes essential.
Evacuate the isolated section before reopening the service valves. Condenser Fan Motor Replacement Disconnect and tag the specific fan motor circuit breaker. Remove the protective fan guard assembly. Loosen the fan blade hub setscrews and remove the blade. Disconnect the motor wiring from the junction box. Unbolt the faulty motor from the support structure. This is where the becomes essential
Журнал Сантехника, Отопление, Кондиционирование 💻 MicroTech II Controller Navigation
McQuay ALS F Chiller Overview | PDF | Heat Exchanger - Scribd Remove the protective fan guard assembly
Covers models ALS 125A through 380A and ALS-F series. It includes critical instructions on receiving, handling, and water piping.
Note: The exact button mapping changed between the "A" series (grey screen) and "B" series (color touchscreen). The service manual contains separate flowcharts for each.
Regular maintenance is essential to ensure optimal performance and extend the life of McQuay ALS chillers. The service manual provides schedules and procedures for routine maintenance tasks, including:
The chiller trips in the middle of a hot afternoon. Manual Action: The service manual’s alarm section explains that this is likely due to a dirty evaporator strainer or a malfunctioning EEV. It provides the resistance values for the evaporator pressure transducer (typically 0.5 to 4.5 VDC output) and step-by-step EEV manual override using the MicroTech keypad.