Lennox MWMA009S4-*L, Руководство по обслуживанию

Страница: 93 / 168

93
Table 3. Status Indicators
Display Remark
47 Indoor unit F capacity demand code Not used
48 Indoor unit F evaporator outlet temp.(T2BF) Not used
49 Indoor unit F room temp.(T1F) Not used
50 Indoor unit F evaporator temp.(T2F) Not used
51 EXV open angle for F indoor unit Not used
19.4. Outdoor Unit Digital Display Tube
There is a digital display tube in outdoor PCB. Digital display tube display function
Table 4. Operation Display
Description
In standby , the LED displays “- -”
In compressor operation, the LED display the running frequency,
In defrosting mode, The LED displays “dF” or alternative displays between running frequency and “dF”(each displays 0.5s)
In compressor pre-heating, The LED displays “PH” or alternative displays between running frequency and “PH”(each displays 0.5s)
During the oil return process, The LED displays “RO” or alternative displays between running frequency and “RO”(each displays 0.5s)
In low ambient cooling mode, the LED displays “LC” or alternative displays between running frequency and “LC”(each displays 0.5s)
In forced cooling mode, the LED displays “FC” or alternative displays between running frequency and “FC”(each displays 0.5s)
When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or alternative displays between running frequency and
“E6”(each displays 0.5s)
In protection or malfunction, the LED displays error code or protection code.
19.5. Dry Mode Operation - MWMA and MWMB
19.5.1. Procedure
1. Press the MODE button to select DRY mode.
2. Press the UP/ DOWN button to select the desired temperature. The temperature setting range is from 62°F to 86°F in
one degree increments.
NOTE: The blower is preset at a low speed and cannot be changed therefore it will get cold and most likely will over
shoot the temperature setting by 6-10 degrees depending on the room size or other various factors. Also the
Follow Me
mode does not operate in this mode.
The Follow Me
mode is only available when a return air sensor
is utilized. Typically in most cases the Follow Me mode will not be sufficient to remove excessive humidity.
In addition, the outdoor units do not have a humidistat installed therefore they are unable to determine humidity
levels. This product is not recommend as a main source for dehumidification.
19.5.2. Dry Mode Operation Sequence
When in dry mode operation the unit is actually in cooling mode with a low speed blower operation. The compressor will stop
when the room temperature is two degrees Celsius lower than the temperature setting.
However there is a temperature compensation for cooling mode that is two degrees Celsius. So the unit will stop when the
temperature is four degrees Celsius lower than the room temperature settings.
NOTE:
Four degrees Celsius is equivalent to 8°F difference.
19.6. Test Run - MWDA and MWMB
Only perform test run after you have completed the following steps:
• Electrical Safety Checks – Confirm that the unit’s electrical system is safe and operating properly
• Gas Leak Checks – Check all flare nut connections and confirm that the system is not leaking
• Confirm that gas and liquid (high and low pressure) valves are fully open.