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Home └Course 9 — Service, Maintenance and Troubleshooting └Quiz 9: check your understanding

Course 9 — Service, Maintenance and Troubleshooting

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Quiz 9: check your understanding

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1. Which of these is a quarterly task rather than a daily one?
Checking for active alarms Measuring superheat and subcooling Listening for unusual noise Reading supply and return water temperature
2. During descaling of a PHE, the main isolation valves should be:
Open, so acid cleans the whole system Closed, with the descaling pump connected to the service valves Half open Removed
3. The approach temperature of a water-side condenser rises from 3 K to 8 K at the same load. The most likely cause is:
Overcharge Scale on the water side Faulty LP switch Low ambient temperature
4. Which water setup best protects a heat pump PHE on very hard borewell water?
Open system with no treatment Higher hot-water set point Indirect closed loop with a coil in the storage tank Removing the strainer
5. A fault code shows "high-pressure protection". What does it tell you?
The exact root cause Which protection acted, not why That the compressor has failed That the refrigerant is low
6. A heat pump in heating mode trips on HP. Water ΔT across the condenser is 11 K (design 5 K). First action?
Recover some refrigerant Raise the HP switch set point Check strainer, pump and valves for low water flow Replace the compressor
7. LP trip with high superheat and low subcooling most likely means:
Overcharge Low refrigerant charge Scaled condenser High water flow
8. Measured flow 2,000 LPH, ΔT 7 K, input 4.2 kW. Field COP is about:
2.5 3.9 5.2 16.3
9. Which is the most common root cause of compressor liquid floodback?
High superheat Low superheat from overfeeding or low evaporator air/water flow High supply voltage Clean coils
10. After a leak repair, the vacuum decay test shows pressure rising and then levelling off. This means:
A leak is still present Moisture is still in the system; keep evacuating The system is ready to charge The gauge is faulty