Service manual

General Functionality ESIE03–01

2–4 Part 2 – Functional Description

1.2 Functions of Thermistors

Locating the

thermistors

The thermistors on the illustration below are used to control the system. This control secures a proper

operation and prevents problems of the unit.

Functions of the

thermistors

The table below contains the thermistor functions of the large h/p.

Ther-

mistor

Location

Wiring

symbol

Mode Function

1 Indoor

heat

exchanger

R2T Cooling

P Optimise discharge temp. (evap. temp.)

P Freeze-up thermostat

Heating P Optimise discharge temp. (cond. temp.)

P Integral capacity calculation (to determine

defrost)

P Hot start indoor fan

P Peak cut-off

P Outdoor unit fan control