Calorex PORTA TEMP 240, Service Manual

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8) ROUTINE MAINTENANCE
The air filter must be kept clean, never allow to become
choked with dust or dirt. If allowed to do so, the performance
of the unit will become impaired, resulting in loss of air flow,
freezing up of the evaporator coil and possible component
damage.
ACCESSING THE FILTER
Lift open the return air grille on the front face of the unit,
Fig 4. On refitting the filter ensure that it is correctly
positioned covering the whole rear face of the grille. The
filter (see Fig. 4) can be washed in warm, soapy water,
rinsed and shaken dry before replacement. Frequency of
cleaning depends upon application and can only be
determined by the user. However, you should never allow
more than two months to elapse between cleaning. The
probable life of the filter will be about one year and spares
are available from the supplier of the unit itself. Failure to
have filter fitted during operation will cause serious damage.
FIG 4.
The refrigeration circuit inside the room unit is fitted with a
HIGH and a LOW pressure sensing switch. They are both
manually re-settable. A pencil or screwdriver with gentle
pressure on the knob behind is all that is required to re-set.
Necessary access is provided through the control console.
HOWEVER, DO NOT ATTEMPT TO RE-SET WITHOUT
FIRST DISCOVERING WHY THE TRIP
OCCURRED IN THE FIRST PLACE
LIFT AND REMOVE AIR FILTER
UNSCREW RETAINERS AND OPEN PANEL TO REMOVE FILTERS
9) MACHINE NOT WORKING?
ONLY A COMPETENT ELECTRICIAN SHOULD
ATTEMPT TO RECTIFY ELECTRICAL SUPPLY
PROBLEMS. DO NOT REMOVE ANY PANELS FROM
THE MACHINE.
Problem - No air flow from room unit.
Diagnosis -Red "MAINS" light off.
Cure - Turn on electricity and/or check mains supply
fuse.
Problem - No air flow from room unit.
Diagnosis - Red "MAINS" light on, White "DEFROST"
light on.
Cure - Machine in defrost mode, do not adjust anything,
machine will revert to normal run after 10 mins.
Problem - Insufficient air flow from room unit.
Diagnosis - Blocked air filter.
Cure - Clean filter
Problem - No cooling.
Diagnosis - Green "COOLING" light off.
Cure - Revolve thermostat knob fully anti-clockwise to
"1". Wait 10 minutes for time delay on start-up
Problem - No cooling.
Diagnosis - Amber "ATTENTION" light illuminated.
High pressure trip.
Cure - Press "+" button to re-set and check for :-
Lack of water flow ... kinked hoses? Shortage of
water ... top up.
External heat exchanger unit mounted in very high
temperature? Water frozen? Add glycol (33%).
External heat exchanger coil blocked with dirt ... clean.
Problem - No Cooling.
Diagnosis - Amber "ATTENTION" light illuminated.
Low pressure trip.
Cure - Press, "-" button to re-set and check for :-
No air flow, blocked filter?
Evaporator blocked with ice. Very low external
temperature?
Problem - No Cooling.
Diagnosis - Amber "ATTENTION" light illuminated.
Low pressure trip.
Cure - Condensate pump not reducing water level.
Kink in Condensate tube between room unit and heat
exchanger? Leak inside room unit. Sump filter inside
room unit blocked. Condensate tube frozen.