Figure 51. Refrigerant flow diagram.

Figure 51. Refrigerant flow diagram.

d. Heating Operation. Placing the selector

(4) To prevent frost from forming on the

switch in the LO-HEAT position actuates half of

evaporator, a back pressure regulating valve is

the evaporator heaters mounted, in the condi-

provided to prevent the suction pressure from de-

tioned air stream, directly behind the evaporator

creasing to a pressure which corresponds to a tem-

coil. When the selector switch is placed in the HI-

perature of less than 32F. (Fahrenheit).

AGO 20053A