Installation, Maintenance & Troubleshooting Flashcards
7 cards from real CWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Installation, Maintenance & Troubleshooting flashcards as text
When installing a water softener, the bypass valve should be in which position during the initial startup and brine tank filling?
Answer: Bypass position
The bypass valve should be in bypass position during initial setup to prevent untreated water from entering the system before it is properly charged and tested.
A customer reports their water softener regenerates every day but water still feels hard. What is the most likely cause?
Answer: The resin bed is exhausted or fouled
Resin fouled by iron, chlorine, or other contaminants loses exchange capacity, causing hardness breakthrough even with frequent regeneration.
What is the purpose of the air check valve in a brine tank?
Answer: To stop brine draw when the brine tank reaches a low water level
The air check (or safety float) stops brine from being drawn into the resin tank once the brine tank water level drops to the preset minimum, preventing air from being pulled into the system.
During installation of an RO system, permeate tubing from the membrane housing should be connected to which port?
Answer: The product water outlet port
The product (permeate) water outlet port directs purified water to the storage tank, while the reject port sends concentrate to the drain.
A UV disinfection system log shows that the UV intensity alarm activated. What is the first corrective action a technician should take?
Answer: Clean the quartz sleeve
A fouled quartz sleeve is the most common cause of low UV intensity; cleaning it is the first and least costly corrective step before replacing components.
What minimum clearance above a water softener is typically recommended to allow for resin replacement?
Answer: 24 inches
A minimum of 24 inches of overhead clearance is generally required to remove the control valve and access the resin tank for media replacement.
Which symptom most strongly indicates that a sediment pre-filter is due for replacement in a residential treatment system?
Answer: Noticeable drop in water pressure throughout the house
A clogged sediment filter restricts flow, causing a measurable pressure drop across the filter and reduced pressure at downstream fixtures.