Topic 11 - Chillers

Question 1

What is the maintenance required for split system air conditioning?

Answer 1

Regular cleaning of the exterior and the air filter inside

Question 2

What is the probable cause for condenser to trip?

Answer 2

1. The condenser coil gets dirty
2. Electrical shorts in the system

Question 3

What is the probable cause of water dripping from fan coil unit?

Answer 3

1. Poor installation of FCU
2. A dirty air filter blocks airflow over the evaporator coil

Question 4

What happens if the discharge pressure is too high?

Answer 4

1. Running current will increase
2. Unit will cycle on and off

Question 5

What happens if the suction pressure is too low?

Answer 5

1. Frost will appear on the coil
2. “white smoke” (saturated air) will be observed discharging from the evaporator

Question 6

What causes scaling at the condenser and what is the effect of it?

Answer 6

Evaporator and condenser tubes collect minerals and sludge deposits from the circulating water. It will increase the resistance of water flow through the tubes thus reducing flow rate and heat exchange.