21
● Manual defrosting (Heat Pump only)
1.System must be running with demand from the thermostat.
2.Forced Defrost Test can be initiated when the running time must be longer than 8 minutes in heat mode only.
3.Press “FORCE” key for 6 secends to begin forced defrost.
4.Execute Forced Defrost.(Please wait 40 secends before defrost)
5.When test begins,the displays will display “dF”.(the display procedure:the running speed of 40S-- “dF”-- the
running speed )
6.Forced Defrost Test is complete automatically ,and the displys is the running speed.
7.If Forced Defrost is needed again , you can repeat step 3 after 5 minutes.
4、Defrost description (Heat Pump only)
● The demand defrost control measures the coil temperature with a sensor locatde on the heat pump coil.A
second sensor located outside the outdoor coil is used to measure outdoor ambient temperature.
The demand of defrost is computed by the coil temperature and outdoor ambient temperature ,also , by the
running time and outdoor ambient temperature, by the running time and high pressure when hing pressure is
lower than a certain value.
● Enter defrosting
The following 3 situations were determined to enter defrosting:
①Outdoor coil temp. T3<34°F, and satisfy a certain correspondence of T4 ambient temp.
②When operating time accumulates to a certain value. For different Ambient Temp. T4, time settings are
different, when T4<-23°F, cumulative time is 4h, when T4≥-23°F and T4＜42°F the cumulative time is 2h .
③ When high pressure lasts low, the situation that the saturation temperature of high pressure lower than
82°F lasts for 20 min determines to enter defrosting.
● Dial code SW5：
Defrosting quit
According to outdoor coil temp.T3 is up to 64°F and lasts for 1 min. Or defrosting time is up to 8 min.
● Defrosting control choice
Dial code SW5 can adjust and set the time that enters and quits defrosting
In general, adjust dial code to ON can enhance the ability of defrosting.
Defrosting choice
SW5-1
SW5-2
Remarks
ON
OFF Normal
Normal
Default
Remarks
Enter defrost
Quit defrost
ON
OFF
1 2
SW5
Operating time is
reduced by 10%
Defrosting extended
for 60 seconds
To Next Page
Loading...
