Heating. - TM-5-4120-393-140026

TM 5-4120-393-14

(5) The service valves (V1) are provided for charging, and general servicing of the high and low pressure sides

of the refrigerant system.

(6) The low pressure switch (S6), the high pressure switch (S5), and the pressure relief valve (V3) are provided

to protect the unit from damage due to pressure extremes.

1-14. Heating.

a. Hi HEAT Mode. When the mode selector switch is set for HI HEAT the six heating elements, located in front of

the evaporator coil, are energized. These elements are protected from overheating by a thermal cutout switch. Three of

the elements are thermostatically controlled by the TEMPerature control thermostat, and the remaining three are on all the

time.

b. LO HEAT Mode. When the mode selector switch is set for LO HEAT, only the three thermostatically controlled

heating elements are used.

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