Davies, Craig says it is an all-round air conditioning industry performer

Who would have thought that back in the ‘60s two young Aussies, Daryl Davies and Bill Craig, would carve out a niche in Australian automotive aftermarket history with their innovative work developing Australian automotive and air conditioning electric fans?
From very humble beginnings Davies and Craig, both of whom were qualified commercial airline pilots, formed Davies, Craig Pty Ltd almost 50 years ago.
This Australian owned and operated company commenced as a manufacturer in the automotive and air-conditioning condenser cooling fan industry sectors producing a range of innovative Thermatic Electric Fans.
Davies, Craig says that the role played by its Thermatic Electric Fans in the world of air conditioning is significant, based on its 50+ years of innovation, research and development.
Following, the company examines the air conditioning system and puts forward some frequently asked questions relating to electric fans, which it says along with the evaporative cooler and compressor is the most vital A/C component.

Size of the condenser
Does size matter? Davies, Craig says yes – stating that the larger the condenser, the better as you want to fill as much of the radiator core size as possible.

Mechanical or electric fans?
Which is more efficient in an air conditioning system? Davies, Craig says airflow supplied by a mechanical fan changes with engine RPM and can be insufficient at low-engine rpm while also absorbing horsepower.
It says the key is air flow and that either of Davies, Craig Thermatic Electric Fans (14-inch high performance or 16-inch Electric Fan) mounted flush with the radiator core and set up as ‘pullers’, requiring a minimum of 2100 CFM ft3/min of airflow, will be sufficient.
Further, it says if you can also install a ‘pusher’ fan as a secondary fan on the condenser core, this will increase the air-conditioning performance at low speeds or at idle (for instance, in traffic).
With most cars and light trucks, Davies, Craig says the installation of one of its Thermatic Electric Fans is a great choice to free up horsepower and decrease fuel consumption.

Evaporator size
What determines the size of an air conditioner evaporator? Davies, Craig says you should install the largest unit possible that will fit into the available space, keeping in mind that when the system is on high and working to its maximum capacity-say, on a 40°c day, it is easier to turn the A/C down than to turn it up.

Suggested modifications
Are there any suggested engine/cooling system modifications necessary when adding air conditioning? Davies, Craig says you should ensure you have a high-performance, high CFM ft3/min Davies, Craig Thermatic Electric Fan, and a high volume flowing mechanical water pump.
Alternatively, it suggests you install a suitable Davies, Craig Electric Water Pump and, finally, at least a double row aluminium radiator.
Should you select the Davies, Craig Electric Water Pump, Davies, Craig says you should opt for the Combo Pack which offers the LCD EWP/Fan Controller. The digital ‘adjustable thermostat’ controls the coolant flow commensurate with engine temperature.

Internal or external?
Most vehicles today have some form of factory-fitted transmission oil cooler. These may be adequate for normal driving, but Davies, Craig says they can prove to be inadequate under heavy load or towing conditions.
As such, Davies, Craig recommends an external or auxiliary Davies, Craig Transmission Oil Cooler which transfers damaging heat.

Interior modifications
Engine heat and outside heat must be kept out of the vehicle’s interior. Efficient air-conditioning systems assisted by tinted windows, proper weatherstrip and door/glass seals will also help isolate the interior and lessen the load on the A/C system.

Most common installation errors
Davies, Craig says not preparing for air conditioning in the planning stages, lack of insulation, not allowing for appropriate space, overcharging or undercharging the A/C system, not seeking advice from a fully qualified specialist, and under-sizing the evaporator to the vehicle are just some of the most common installation errors that it sees.

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