Question about Turbo Air 49 cu. ft. / 1388 liter Commercial Freezer MSF-49NM

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Msf-49nm evaportor pan and drain iced up

Hello - Upper evaporator housing and drain are frozen solid (since new) with, I presume, dripping during defrost, which drips onto frozen goods and into incandescent light housing, breaking the bulb. Is there a drain heater or pan heater reset? Is this a common thing? I know refrigeration basics, but am looking for wisdom before dropping the evaportor housing for an icy looksie.

Turbo Air, Maximum MSF-49NM

Thanks - Ed

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  • Turbo Air Master
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I deal with MasterBilt which is a private lable made by TurboAir.
I have several units but only one does this icing up thing. Look for a bad seal on the door gasket. These really ice up if that does not seal almost perfectly. Look for premature termination of the defrost cycle. Check that the heater is pulling amps. The wiring diagram at "turboairinc.com" is very poor but it shows 2 heaters for the refrigerator. They list a diagram for the freezer but it's not there. I know for sure that there is a heater for the evap but don't know about the drain. I've seen some have it and some don't. there tech support line has much to be desired but it's worth a shot. Also, the bottom hinge on the door fails fairly regularly. This allows the door to drop just enought to disengage the switch at the top of the door and stop the evap fan from running, thus causing a freeze up.
Good Luck . You got your hands full with this one.

Posted on Mar 07, 2009

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Inside rear panel bulging


Unplug the unit and take out all the drawers and remove the back (behind the drawers) panel carefully. (This back panel has foamy thermal insulation behind it and this will be probably be enmeshed with ice - you may have to wait awhile for this ice to melt before you can remove the panel, even after you have unscrewed it.
When you have got the back panel off, you will see a large solid block of ice, probably halfway up the cooling coils, right down to the bottom of the exposed space. You have to melt all this ice (I used a hair dryer to blow warm air onto the ice (have towels and a bucket ready to mop up the melted water, otherwise it will run over the floor. When you have melted all this ice, you will see a drain hole at the bottom of the exposed space. This will have ice in it and it must be cleared.
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I now defrost in this manner every six months or so. Sadly, very sadly, Hotpoint, like other white goods manufacturers (Baxi Potterton boilers for instance) do not reply to my enquiries.
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Normal 0 MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-fareast-font-family:"Times New Roman";} Your evaporator coils frost up in normal use and every eight hours or so the entire unit shuts down and the defrost heater comes on to melt the frost. This cycle last about 20 minutes. The melted frost drips into a drain pan and through a drain tube to the drain tray under the freezer/refrigerator where it's evaporated by the condenser fan.


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Your evaporator coils frost up in normal use and every eight hours or so the entire unit shuts down and the defrost heater comes on to melt the frost. This cycle last about 20 minutes. The melted frost drips into a drain pan and through a drain tube to the drain tray under the freezer/refrigerator where it's evaporated by the condenser fan.


Your drain tube may be stopped up with ice at the upper end because it drains too slow because it's stopped up at the lower end in the evaporator pan under the unit at the floor. It can get dust and mold in it. Once you get the ice out at the top a little pressure with a turkey baster will usually clear it out. Flushing it out with hot water and clorox may help.
Make sure it drains quick enough to prevent refreezing. . The drain should be located below the evaporator coils on the lower back of the freezer.

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Your drain tube may be stopped up with ice at the upper end because it drains too slow because it's stopped up at the lower end in the evaporator pan under the unit at the floor. It can get dust and mold in it. Once you get the ice out at the top a little pressure with a turkey baster will usually clear it out. Flushing it out with hot water and clorox may help

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