A high temperature differential (more than 2 degrees) between return air temperature at the grille and the return air temperature at the unit indicates:
A) Low refrigerant charge. B) Clogged liquid line.
C) Return air leakage. D) Dirty evaporator coil.
C
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Los colectores de vapor suelen ubicarse _____.
a. bajo tierra b. en el ático c. cerca de la caldera d. sobre la pila
The electric motor is the smallest load used in most heating, cooling, and refrigeration systems.
Answer the following statement true (T) or false (F)
A unique feature of multizone and double-duct systems is that they:
A) Can deliver conditioned air to different zones. B) Will fit in tight spaces. C) Can heat and cool at the same time using a single air handler. D) Operate more efficiently than most other systems.
An op-amp circuit has the following values: +V = 9 V, -V = -9 V, Av = 115. Assume that the load will not restrict the output voltage swing. The maximum allowable value for Vin is
A) 21.17 mVpp B) 10.59 mVpp C) 60.87 mVpp D) 157 mVpp