Digital Controller

EWP & FAN DIGITAL CONTROLLER - PART No: 8020  (INSTRUCTION SHEET.pdf)
The updated Digital Controller how has two specific functions. This unique Controller will now manage the operation of the EWP® by varying the speed of the EWP® in response to the temperature of the engine and manage control of your electric engine fan. The Controller has a push-button on the facia panel that offers 5 target temperatures, 75ºC, 80ºC, 85ºC, 90ºC & 95ºC. Generally, higher engine temperature will offer improved fuel efficiency and lower engine temperature more power. The Digital Controller will now operate the engine’s electric fan automatically once the engine has reached +3c above the target temperature. A significant benefit too is the Controller allows the EWP® to run on after ignition shutdown to reduce heat soak. It is recommended that engine operational temperatures be checked with manufacturer.
 
The Digital Controller can be used with our EBP however it is not recommended as it will not vary the speed of the pump in response to temperature but rather simply turn the pump on and off once the top end temperature is reached. For a far more economical & appropriate solution, we would recommend Part Number 0401 & 0402 to turn the EBP on and off at your set temp.
 
*Note: This controller (part no 8020) is suitable for only negativley earthed systems.
In combination with a Davies, Craig Thermatic Fan®,  the temperature of the whole cooling system can be customised to suit your requirements.

  
Thermal Switches

A Thermal Switch is a device which senses the temperature of the radiator and turns on the electric fan when cooling is needed. The Thermal Switch is adjustable over a wide range of temperatures by turning an adjustable screw located on the controller. Davies Craig offers two types of switches, a mechianical & electronic version.

MECHANICAL THERMAL SWITCH - PART No: 0401 & 0404(with relay) (INSTRUCTION SHEET)
The Mechanical Thermal Switch is adjustable from 40° to 100°C (104° to 212°F).
It is mounted near the radiator and the stainless steel probe fitted inside the radiator hose making contact with the coolant. The mechanical thermal switch is then connected to the  ignition circuit for operation. The thermal switch & relay kit (Part 0404) enables a fan to operate both thermally and also when the air conditioning is running.     
                                                                                              

ELECTRONIC THERMAL SWITCH (12V ONLY) - PART No: 0402 (INSTRUCTION SHEET)
The Electronic Thermal Switch Kit has an adjustable temperature range of 40ºC to 99ºC (104ºF to 210ºF). The Electronic Thermal Switch, relay and wiring loom are assembled and pre-connected ready for installation. This switch is operated thermally and also when the air conditioning is in operation. The Electronic Thermal Switch has the advantage over the Mechanical Thermal Switch in that the probe is designed to be placed between the radiator fins and accurately senses the air temperature.
                                                                                               
 
TEMPERATURE SENSOR ADAPTOR KIT - PART No: 0409 (INSTRUCTION SHEET)
Now there is no need to squeeze the probe of the Mechanical Thermal Switch or EWP Controller between the radiator inlet and radiator hose. This simple and economical Adaptor Kit allows easy fitting directly into the radiator hose. Just fit probe into compression fitting, remove about 17mm of radiator hose, fit adaptor between each end of hose, secure hose clamps and the job is done. The kit comes with everything you need for a watertight and effective installation. We even supply rubber sleeves to enable fitment to radiator hose sizes from 32 to 40 mm diameter.
                                                                                              

 
LOW COOLANT LEVEL ALARM KIT - PART No: 1030 (INSTRUCTION SHEET)
This new Low Coolant Level Alarm Kit will monitor the coolant level in engines and will immediately identify low coolant should this situation develop. This cool new device comes with a loud audible alarm and will help prevent an over-heating engine and significant engine failure. The new Davies, Craig Low Level Coolant Alarm Kit simply fits into your engine’s top radiator hose. The Kit, will alert you immediately to the loss of engine system coolant. This kit’s module, mounted in the driving compartment, will sound an audible alarm should the engine coolant level drop. This situation may occur when a radiator hose splits or frays, a radiator springs a leak and the engine’s coolant is either low or lost. The vehicle’s simple temperature gauge will not alert the driver to this event and the Low Level Coolant Alarm adds security to assist monitor your engine’s coolant level. Loss of engine coolant can cause the water pump to lose pressure and will quickly develop into to an overheated engine. Most engine temperature protection systems and gauges will not detect coolant loss as they rely on sensing the coolant temperature. When the coolant is lost, the gauges cannot sense engine temperature and as such expensive engine failure may occur. 
                                                                                             
 
CAUSES OF OVERHEATING IN ORDER OF LIKELIHOOD
1.  Fan facing wrong direction.
2.  Fan rotating wrong direction.
3.  Fan wired to coil or alternator (only 8 Volts.)
4.  No condenser fan.
5.  Temperature gauge faulty - disagrees with thermometer in radiator.
6.  Towing a heavy caravan.
7.  Inadequate kit fitted.
8.  Oil cooler obstructing ram air.
9.  Insect screen obstructing ram air.
10. Driving lights obstructing ram air.
11. Number plate obstructing race air.
12. Battery not up to 13 Volts.
13. Insufficient water in radiator.
14. Radiator needs cleaning.
15. Radiator cap faulty allowing water to boil at 100°C.
16. Thermostat faulty.
17. Electric motor faulty.
18. Fan not in hot corner of radiator.
19. Engine out of tune or idling too fast. 
 
Please visit our buy online section to view the Davies Craig Controller & Switches range.