Unit Protection Devices - Carrier 38AW050H7 Bedienungsanleitung

Unit protection devices

Operating
Type of safety device
mode
Protection against excessively high
Heating
heat exchanger temperatures
Outdoor heat exchanger defrost
Heating
cycle
Indoor heat exchanger frost
Cooling
protection
Cooling or
Delayed compressor start
heating
IMPORTANT!
During functioning in heat pump heating mode, the unit performs defrost cycles to eliminate any ice that might form at low
temperatures inside the outdoor unit.
Maintenance
The following maintenance operations must be carried
out by qualifi ed personnel.
Cleaning the coil
If necessary, proceed as follows for more careful cleaning
of the coil:
Switch the mains supply OFF.
Troubleshooting
System does not start:
• Electrical connections are wrong or incomplete, fi x them.
• Some switch or braker are in the OFF position; place them
in the ON position.
• Wait for 3 minutes: protection against frequent
compressor cycling is ON..
• Selected temperature is lower than actual temperature (or
higher in cooling mode).
System is not supplying enough heating (or cooling):
• Air cannot circulate freely around the outdoor unit.
• Dirty water fi lter in the hydronic module reduces water
fl ow.
128H50_38AW copia.indd 11 128H50_38AW copia.indd 11
What happens
Compressor operation frequency is
reduced or stopped altogether
The outdoor unit fans are switched off
Compressor operation frequency is
reduced or stopped altogether
The compressor does not start
immediately when the appliance is
switched on
Remove unit top cover by losening the fi xing screws and
lifting the cover. Carefully clean the coil with a vacuum
cleaner from inside to outside. With the same vacuum
cleaner, remove the dust from inside the fan compartment
and the fan blades. Avoid any damage to the blades which
may cause future vibrations and noise.
Replace the unit cover and tighten the screws.
• Doors and/or windows are open.
• Pump speed (in the hydronic module) is to low. Pump
speed must be changed by skilled personnel only.
• Selected temperature is not correct.
A slight whistling noise is heard when the outdoor unit
starts or stops:
• This is due to the refrigerant beginning to circulate or an
adjustment of the refrigerant pressures. This is a normal
operating condition.
When the safety device
trips
During functioning
During functioning
During functioning
On start-up or on mode
change
38AW-
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7-04-2009 14:11:40 7-04-2009 14:11:40