In an area where freezing drizzle is common in winter, which defrost interval stands the best chance of
keeping a heat pump outdoor coil free of frost?
a. 30 minutes
b. 60 minutes
c. 90 minutes
d. 120 minutes
Question 2
In the heating mode, a leaking check valve on the indoor coil will show up as _____.
a. a noisy compressor
b. a chattering check valve
c. normal operation
d. low head pressure