Defrosting Control (Heat Pump) - McQuay MQS-24018-CFC216A Installation And Operation Manual

Floor ceiling air-conditioning unit
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radios to prevent picture interference and noise.
(Depending on the incoming signal strength, a distance of 1 meter may not be sufficient to eliminate noise.)
Remote controller (wireless) transmitting distance can be shorter than expected in rooms with electronic
fluorescent lamps (inverter or rapid start types).
Install the indoor unit as far away from fluorescent lamps as possible.
Do not install the air conditioner in the following locations:
1. Where there is a high concentration of mineral oil spray or vapour (e.g. a kitchen).
Plastic parts will deteriorate, parts may fall off and water leakage could result.
2. Where corrosive gas, such as sulphurous acid gas, is produced.
Corroding of copper pipes or soldered parts may result in refrigerant leakage.
3. Near machinery emitting electromagnetic radiation.
Electromagnetic radiation may disturb the operation of the control system and result in a malfunction of the unit.
4. Where flammable gas may leak, where there is carbon fibre or ignitable dust suspensions in the air, or where
volatile flammables such as paint thinner or gasoline are handled.
Operating the unit in such conditions may result in fire.
3

Defrosting Control (Heat Pump)

The Defrosting Mode:
After the compressor consecutively runs for "t" minutes, it will start defrosting if the sensor detects the
temperature "T1"
for consecutiv e 1 minute. Defrosting will stop after running for 10 minutes or the sensor
detects the temperature over "T2" .
Defrosting Control:
There are 8 defrosting modes corresponding to different DIP ways (refer to Table 3-1, NOTE: the contents of the
table may vary as the technology updates.)
Firstly the abbreviations are defined as below:
T---------the defrosting temp sensor starts to detect after the compressor has been operating for t minutes
accumulatively
T1----------the defrosting circuit on the main board starts to work when the defrosting temp sensor has been in T1
or under T1
for 1 minute continuously
T2---------The defrosting will stop after it goes on for 10 minutes continuously or the temp sensor detects the
ambient temperature over T2
T-----------outdoor ambient temperature
Outdoor ambient
temp sensor
000
DIP
T
-
T
44
T1
-2
T2
15
Outdoor ambient temp sensor
does not work
001
010
011
-
-
-
44
60
90
-5
0
0
20
20
20
Outdoor ambient temp sensor works
101
100
-
≥ -3
<-3
30
30
60
0
-2
-10
20
20
15
6
110
111
≥ -3
<-3
≥ -3
44
90
90
-2
-10
-2
20
15
20
<-3
120
-15
15

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