The advantage of the backward curved centrifugal fan over the forward curved centrifugal fan is that
A) backward curved fans are normally quieter in operation
B) backward curved fans are non-overloading
C) backward curved fans operate at lower RPMs
D) backward curved centrifugal fans are well suited for small airflow quantities
B
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The ____________________ of the primary circuit is found by multiplying the primary voltage and current values..
Fill in the blank(s) with the appropriate word(s).
The ____ opening is the size of the opening required in the foundation wall to accommodate the window.
A. nominal B. masonry C. anchor D. girder
Fan cycling, fan speed control, damper control, and condenser flooding are different types of:
A) Condenser low ambient controls. B) System capacity control. C) Energy efficiency improvements. D) Protection against excessively high condenser pressures.
When a zone thermostat fan control switch is moved from Auto to On, what should happen?
a. All system dampers open and the blower starts. b. The zone damper for each zone set to On opens and the blower starts. c. The zone damper for that zone closes, all the others open, and the blower starts. d. The zone damper remains open at all times, regardless of the system operating conditions