Lennox A111C, Руководство пользователя

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13
DEFROST MANAGEMENT
COD
MIN MAX UNIT VAR. DEF
DESCRIPTION
d8
0 1 --- 1
0/1
It establishes the enabling of the indoor fan during the defrost cycle.
d8=0 Disabled (Fan off)
d8=1 Enabled (Fan on)
VALUES
Factory setting:
If the unit is not supplied with electrical heater (option), inner fan turns on during defrost cycle after some fan time;
in this case factory setting is d8=0.
If the unit is supplied with electrical heater (option), inner fan doesn't turn on during defrost cycle; in this case factory
setting is d8=1.
In any case, running of electrical heater is joined with inner fan operation.
DEFROST CYCLE SEQUENCE:
During defrost cycle, the compressor will stop for a short time, It will change the mode of working (heating mode
to defrost cycle), then the outdoor fan will stop and at the end, the indoor fan will stop or not according to the
parameter d8.
START DEFROST CYCLE
The defrost cycle begins when outdoor probe temperature reaches -3ºC more than 1 minute.
END DEFROST CYCLE
The defrost cycle ends when outdoor probe temperature reaches 25ºC.
DELAY BETWEEN TWO DEFROST REQUESTS
Time between two defrost cycles is calculated from the end of one to the beginning of next , it could be from 14
to 35 minutes, depending on external conditions.
MAXIMUM DEFROST DURATION
10 minutes is the maximum time defrost cycle will be on.
POWER BOARD OF THE SYSTEM AT THE ELECTRICAL BOX OF THE AIR-CONDITIONING UNIT
-The board features a signaling green LED which flashes when unit is electrically supplied.
-The control features a minimum run timer, which ensures that once started in heating or cooling, mode the
compressor (and other associated components) remain running for a minimum of 5 minutes. The unit will not
respond to a change in mode for this period of time. This prevents premature wear of components. Please bear
this in mind when carrying out maintenance to the unit.
d13
0 1 --- 1 0
d13=0 Normal operation for defrost function.
d13=1 Force defrost function to start, defrost function will last for
10 minutes.
Any time we turn on to normal operation, set d13 parameter to 0
The defrost process is activated during heating mode in heat pump units, when the outside temperature is low and
the outdoor coil could become frozen.
To melt the ice the defrost function will switch the unit to cooling operation for a short period.
Note: During defrost function, if indoor fan is working, cold air will be supplied into the room. Using d8 parameter,
the indoor fan can be switched off during the defrost process.