In a Water-Cooled Package Unit (WCPU) system, the circulation pump is responsible for moving water between the unit’s internal condenser and the external cooling tower. If this pump fails or loses efficiency, the WCPU cannot reject heat, leading to high-pressure (HP) trips, increased energy consumption, and eventually a total loss of cooling for the zone. EKG (Malaysia) Sdn Bhd provides specialized diagnostic services for WCPU pumps, focusing on identifying hydraulic, mechanical, and electrical faults that impact your building's climate control.
Frequent High-Pressure (HP) Trips – The WCPU compressor shuts down because the pump is not moving enough water to cool the refrigerant.
Low Delta-T (Temperature Difference) – The water entering and leaving the unit has a similar temperature, indicating poor heat exchange due to low flow.
Metallic Grinding or Screeching – Signs of bearing failure or an impeller rubbing against the pump casing.
External Water Leaks – Water pooling around the pump base, typically from a compromised mechanical seal.
Motor Overheating – The pump motor feels excessively hot to the touch or trips the thermal overload relay.
We measure the pressure at both the suction and discharge ports. By calculating the Differential Pressure (Delta-P), we can determine if the pump is operating on its design curve or if it is suffering from internal wear, air-locks, or clogged suction strainers.
We check the "weep hole" of the pump for active leaks. In a WCPU setup, leaks often lead to mineral scaling that can seize the pump shaft if not addressed. We evaluate the seal faces for "heat checking" caused by running the pump dry.
Using digital vibrometers, we measure the vibration frequency of the motor and pump housing. High-frequency vibration usually points to bearing wear, while low-frequency vibration often indicates Shaft Misalignment between the pump and the motor.
If flow is low but pressures are high, we dismantle the pump casing to inspect the impeller. We look for:
Erosion/Pitting: Caused by cavitation or poor water treatment.
Debris: Plastic shards, scale, or "bio-slime" from the cooling tower that can clog the impeller vanes.
We perform an insulation resistance test (Mega-test) on the motor windings. We also check for Phase Unbalance or "voltage sag," which can cause the motor to draw more current and run hot, potentially leading to a burnout.
We test the flow switch and the communication between the WCPU controller and the pump starter. We ensure that the WCPU compressor only starts when the pump is confirmed to be moving water, preventing expensive compressor damage.
WCPU Specialists: We understand the specific flow and pressure requirements for water-cooled package systems.
ISO-Certified Quality: Our diagnostic procedures follow strict international standards to ensure accuracy and safety.
Rapid Response in Selangor: We provide fast on-site troubleshooting to get your cooling system back online.
Comprehensive MEP Approach: We diagnose the pump as part of the total HVAC system, including the cooling tower and the WCPU unit itself.
Don't let a faulty circulation pump compromise your cooling reliability or increase your energy bills. Trust EKG (Malaysia) Sdn Bhd for technical, ISO-certified WCPU circulation pump diagnosis and repair. Our expert team will identify the root cause of your issue and provide a permanent, efficient solution.
Is your WCPU tripping or not cooling enough? Contact us now for a free site assessment and a technical diagnostic quote for your circulation pumps!
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