907611.pdf

Installation Instructions

Battery Discharge Protection Module P/N 900030

MODULE PIN IDENTIFICATION

Pin 3:

Battery direct (+)

Pin 5:

Switched ON signal from

Webasto switch device

Pin 8:

Output signal to Webasto

control unit (ON signal)

Pin 6:

Ground (–)

This system limits battery discharge from the

Webasto heater unit to a preset level of 11.5

volts to ensure adequate minimum voltage for

engine starting requirements.

The Battery Protection System is installed

in-line between the ON/OFF device and the

control unit of the heater.

SPECIFICATIONS

POWER INPUT

PROTECTION

Voltage:

12/24 VDC Models

Transients

RF signals

Reverse polarity

Fuse 10 Amp.

Temperature compensated

Voltage stable

Current:

250 Milliamps max.

plus load.

SIGNAL OUTPUT

10 Amp. Non-Inductive

5 Amp. Inductive

For questions concerning the installation instructions or the products discussed on this sheet, call: 1-800-555-4518 USA

1-800-667-8900 Canada

Org. 04/1997 907611

www.webasto-thermo.com • www.webasto-us.com • www.webasto.com

Page 1 of 4

Installation Instructions

Battery Discharge Protection Module P/N 900030

FUNCTION

When the heater is switched on, the system is initiated and continuously monitors battery

voltage. If the battery voltage reaches the preset level (suggested 11.5 volts) and remains low

for 8 seconds, the audio alarm is activated indicating impending heater switch off due to low

voltage. After 20 seconds the heater will be switched off, and the audio alarm stops. The ON

signal is “locked out” until the system is reset by cycling the Webasto switch off and then back

on.

The module is adjustable by tenths of a volt to any voltage level. On the plug end of the module

is an adjusting screw and a LED to indicate switching points. Turning the screw clockwise will

increase voltage cut-out level and counter clockwise to decrease cut-out level.

SELF-TEST

Each time the heater is switched ON, the system self-tests, indicated by the audio alarm for three

seconds. The circuitry includes a momentary low voltage trigger for this purpose.

INSTALLATION

Mount battery discharge protection module near the Webasto heater switch or timer behind

dashboard in a protected area. Do not expose to weather conditions or other sources of

contamination.

See following wiring diagrams for proper connection to the electrical circuitry of the heater.

WIRING DIAGRAMS

Wiring diagrams apply to common switch or timer configurations as used with current

Thermo 90 / 90 S and DBW 2010.73 model heaters manufactured after 9/96.

For wiring configurations different from those shown, please contact Webasto Product North

America, Inc. directly for instructions.

For questions concerning the installation instructions or the products discussed on this sheet, call: 1-800-555-4518 USA

1-800-667-8900 Canada

Org. 04/1997 907611

www.webasto-thermo.com • www.webasto-us.com • www.webasto.com

Page 2 of 4

Installation Instructions

Battery Discharge Protection Module P/N 900030

WIRING DIAGRAMS

Diagram 1: General Terminal and Connection Identification

Additional jumpers and terminals will

be required in applications where

both a timer and switch are utilized.

Adapter harness to connect switch or timer

ON signal terminal to pin 5 of battery

discharge protection module shown below.

Harness P/N 901164

Diagram 2: Switch Connections

Use supplied adapter harness

to connect pin 5 of module to

‘On signal’ terminal of switch.

For questions concerning the installation instructions or the products discussed on this sheet, call: 1-800-555-4518 USA

1-800-667-8900 Canada

Org. 04/1997 907611

www.webasto-thermo.com • www.webasto-us.com • www.webasto.com

Page 3 of 4

Installation Instructions

Battery Discharge Protection Module P/N 900030

Diagram 3: Switch and 72 Hour Timer Connections

Use supplied adapter harness to connect

pin 5 of module to ‘On signal’ terminal

of switch and timer.

Diagram 4: 7-Day Digital Timer Model 1529 Connections

Diagram 5: 7-Day Digital Comfort Timer Model 1531 Connections

For questions concerning the installation instructions or the products discussed on this sheet, call: 1-800-555-4518 USA

1-800-667-8900 Canada

Org. 04/1997 907611

www.webasto-thermo.com • www.webasto-us.com • www.webasto.com

Page 4 of 4

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