Which of the following could lead to low refrigerant head pressures on a wet bath chiller?
a. A dirty condenser, faulty fan controller/ VFD, or high ambient air temperature.
b. Low ambient air temperature, low fluid flow, or low refrigerant.
c. Faulty crankcase heater, bad pump seal, or peeling paint.
d. Condenser fans running too fast, a low reservoir, or low refrigerant.