Tabla de contenido
Publicidad
Daily Maintenance
Fault Finding
Service
As mentioned earlier, it is imperative that the air flow is not impeded
in any way. It is important that the grilles are kept clean and clear at
all times. Even dust and fluff can impair the performance, therefore
the units must be used in a clean environment or they should be
regularly cleaned.
1 Check that the airways have not been restricted either by
something placed in front of them or through build up of dust and
fluff on the grilles, etc.
2 The most common cause of poor performance is that the liquid is
not being circulated over the coil. First check that the pump unit is
not blocked either by foreign matter or by balls from a ball blanket
or in any other way. Also check that the pipe system, if you are
using the fridge unit for an external system, is not kinked or
restricted in any way.
4 If the liquid or the circulation is not the cause of the poor
performance then there may be a number of other causes.
5 Check that the internal fan is running by feeling if there is air
blowing when the unit is on. If not then the unit needs servicing as
below.
6 Check that the compressor is running by listening for it to start
and stop as the unit gets to its lowest temperature. If not then the
unit needs servicing as below.
7 Last of all the unit may have lost gas and needs servicing as
below
1 Complete servicing and repair of Techne products is available at
Techne see the contact information on page 4.
2 A Service Manual is available and servicing may be undertaken by
any competent refrigeration engineer.
The following table gives a guide as to the gas charge for each of
the units:
Unit
CH-5
* There have been several improvements in design which have
varied the charge. To increase the cool-down rate increase the
charge slightly; to reach a lower temperature reduce the charge
slightly. Adjust the charge during testing.
§ Early units were charged with R12 please consult Techne for
advice on repair of older units. Units charged with R134a have
GN after the Serial Number,
eg 12345/5 GN.
C H - 5 C h i l l e r U S E R ' S M A N U A L
Refrigerant §
Charge *
R134a
95 gm
P A G E 15
Publicidad
Tabla de contenido
