Webasto BCT010300C Repair Manual download pdf (Page 11)

Functional Description

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3. Functional Description

3.1 General Information

The control module is designed with a 30 minute delayed start feature. When a 12 volt positive signal is applied to the

pink wire (connector X1, position 3), the control module begins the 30 minute time delay count down. However, if

during this 30 minute period, the key is cycled OFF and ON regardless the number of times, the 30 minute countdown

sequence will not be interrupted.

Once 30 minutes have elapsed, the control module will check for:

• KOS 12V positive reference signal

• Digital temperature sensor signal (located in the cold storage core)

• A closed circuit through the ambient temperature thermostat and high/low refrigerant pressure switch

3.2 Charging Mode (Operation with 30 Minute Delayed Start Feature)

3.2.1 Key On Signal (KOS) with 12V reference signal to control module.

Condition 1:

With the key ON

(engine running) and the internal storage core temperature < 30 ºF (–1 °C) the power output from

the control module (connector X1, position 5) to the control relay IS NOT

provided, unless during driving time the

temperature is 30 ºF (–1 °C).

If during vehicle operation (engine running) of a sufficient amount of time to drop the internal storage core

temperature below 30 ºF the control module will initiate a new 30 minute delayed start countdown after which, based

on the temperature in the storage unit, WILL

or WILL NOT provide a signal to the control relay.

Approximate time to completely recharge (freeze) the storage core is approximately 6 hours depending on the ambient

temperature.

Condition 2:

With the key ON

(engine running) and the internal storage core temperature 30 ºF (–1 °C) the power output from the

control module (connector X1, position 5) to the control relay IS provided.

If during vehicle operation (engine running) of a sufficient amount of time to drop the internal storage core

temperature below 30 ºF (charge complete) the control module will initiate a new 30 minute delayed start countdown

after which, based on the temperature within the storage core, WILL

or WILL NOT provide a signal to the control relay.

Approximate time to completely recharge (freeze) the storage core is approximately 6 hours depending on the ambient

temperature.

System Monitoring:

The storage core is considered fully charged when the internal core temperature is less than 30 ºF (–1 °C).

To ensure the temperature is maintained below 30 ºF (–1 °C), the control module will continually repeat the 30 minute

delay countdown and temperature sampling and based on the temperature within the storage core, WILL

or WILL NOT

provide a signal to the control relay.

Key OFF:

With the key OFF

(engine stopped), regardless the internal storage core temperature, power output from the control

module (connector X1, position 5) to the control relay IS NOT

provided. (See Section 3.3, “Discharge Mode”)

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Webasto BCT010300C Repair Manual Page 11

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