High-country-tek HFS-2Q Manual do Utilizador descarregar pdf (Página 9)

Hydraulic Fan System Controller : HFS - 2

Charge Air:

There can be a special case of cooling requirements when the engine is warming up

from a cold start. For this situation, the controller has a ‘Cold Engine Fan Limit’

option available to the user which if enabled, will temporarily stop the fans rotation

to prevent excessive cooling.

The ‘Charge Air’ temperature can easily exceed its desired setpoint value while the

Engine Coolant temperature is still too cold to let the standard mechanical

thermostat open

Normal operation would allow the ‘Charge Air’ temperature to capture the fan

control, cooling any other above ambient liquids in the radiator.

This would typically cause a sudden introduction of cold water when the engine

does eventually warm up enough to cause the thermostat to open, resulting in the

chance of engine block damage with thermal shock.

‘Ch g Ai ’ t ll d f d l l d gi

ti g ti g ll ti

‘Ch

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con

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spee

can

own

warm-up

enera

unnecessary

on,

inefficient running and excess fuel usage. On a cold start, reversing the fan during a ‘purge cycle’ will have a

similar effect as most radiators will then be cooled by the air sucked from around the cold engine.

The ‘Cold Engine Fan Limit’ feature avoids these problems by not allow the Charge Air OR Reversing inputs to

take control of the Fan speed while the Engine Coolant temperature is less than the ‘Engine Warm Temp’

setpoint.

 The Engine Coolant senso

MUST be connected to Thermistor 1 input and set to type

Thermistor.

 The ‘Charge Air’ sensor MUST be connected to Thermistor 2 input and may be set to type

Thermistor or Switch.

Fan control b

the thermistor 1 and 3 in

uts is not limited b

the ‘En

ine Warm Tem

’ set

oint. While the unit

Important Notes:

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Ot ’

t i t’ ill id th ‘

CldE i

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is waiting for thermistor 1 to reach engine warm temperature, clearing the ‘Cold Engine Fan Limit’ will not exit

the waiting mode.

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arge

’

empera

ure reac

e user en

ere

‘

ver

emp

’

t’

ill

overr

‘

Fan Limit’ and go to full fan forward rotation while the condition exists, to ensure that damage does not

occur and that the Overtemp condition is reduced.

2. The ‘Charge Air’ limiting feature only functions when power is initially applied to the controller.

3. The ‘Warm engine temp’ setting MUST NOT exceed the ‘Coolant’ temperature setpoint.

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