Pre-Heater Control Unit; Control Panel - KAMAZ 5490 Operation Manual

5. Pre-heater control unit

Jointly with the control panel, the control unit is
used to control the pre-heater operation
The control functions of the pre-heater are the following:
a) initial health check of the pre-heater units at
start;
b) health check of the pre-heater units during
operation;
c) «normal» and «economic» programs selection
and support of their automatic operation (switching over
to different modes depending on temperature of the
coolant fluid);
d) pre-heater switch off:
- when the preset cycle finishes (3h or 8h cycle);
- when one of the controlled units fails;
- when the preset parameters (temperature,
voltage, blowout) are out of the limits;
- when flameout in the combustion chamber is
arise.

6. Control panel

Control panel (further on – panel) is a part of the
pre-heater meant for manual control of the device.
The panel functions are the following:
- pre-heater manual starting and switching off;
- selection of a program and duration of
operation;
- control of the cab heater fan;
- indication of the pre-heater status (ON, OFF,
Failure).
Figure 4 – Control panel faceplate
6.1 «ПУ-4МР» control panel set-up and how-to-
use principle.
The faceplate of the panel has two key switches (1
and 2), LED (3), heat controller knob (4) – refer to
Figure 4.
6.1.1 The key switches are used for the following:
- key switch 1 is used to start (position «I») and
stop (position «О») the pre-heater;
- key switch 2 is used to select the operating
mode:
The pre-starting mode is used to warm up and
keep the engine warm for 3 hours.
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