The Conditions When Dx-Coil Unit Is Forcibly Thermo-Off - Mitsubishi Electric GUG-01SL-E Technical Manual

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System configurations /
CHAPTER

3. The conditions when Dx-coil unit is forcibly thermo-OFF

Under the conditions listed below, Dx-coil unit is always and forcibly thermo-OFF. Dx-coil unit cannot be thermo-ON for about 10
minutes after the condition is canceled.
• When the supply fan of Lossnay unit is stopping, fan speed 1 or fan speed 2.
• When the Lossnay unit is operating at Night-purge mode.
• When outdoor air temperature detected by a thermistor in Lossnay unit is less than -15
• When outdoor air temperature detected by a thermistor in Outdoor unit is more than 19
temperature control and heating mode.
• When the system (Lossnay unit, Dx-coil unit, Outdoor unit) has an error.
4. Water level sensor
The Dx-coil unit has a water sensor to detect the water level in the drain pan and has a drain pump to drain the condensation
water during cooling mode.
If the drain pump cannot drain the water properly, the water level in the drain pan increases and the water sensor detects the
water, and then finally an error occurs to avoid the water overflow.
During the error is occurring, the supply fan of Lossnay unit will continue to run at fan speed 2 or 1 to avoid that the water fly
out from the product.
5. Drain pump operation
The drain pump becomes ON at the conditions listed below.
• When Dx-coil unit is cooling mode.
• When the water sensor is detecting the water.
• When the lead wire connector that should be connected CN10 of PCB B is disconnected.
• When the drain pump test run switch is ON.
The drain pump continues to run for six minutes after the condition is canceled except for the test run.
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3. The conditions when Dx-coil unit is forcibly thermo-OFF/4. Water level sensor/5. Drain pump operation
.
˚C
, if GUG-03SL-E is used at SA
˚C