Delfield SAF3S-S Specifications download pdf (Page 16)

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The electronic temperature control constantly monitors box

temperature as well as evaporator coil temperature to maintain

consistent product temperatures. The control also sends

temperature readings to the digital temperature display. The

control circuits continually self-check and if an error occurs,

the digital display will switch from temperature read-out to

error read-out, i.e. E1. Even when an error is displayed, the

refrigeration and controls system should continue to function,

however not at optimal performance. Whenever the display has

an error read-out, Delﬁeld Service should be contacted.

At initial start-up or anytime power is disconnected, then

reconnected to the unit, the control will delay all operations for

a short time (up to 10 minutes.) While in this delay period, the

control initializes the control parameters and conﬁrms that the

temperature sensors and circuits are operational. The digital

temperature display will not display temperature OR errors until

the self-check is complete and the control has switched on the

evaporator fan motor, compressor and condenser fan motor.

Regarding Freezers: After initializing, the control will

immediately enter a DEFROST mode and the display

will read DEF. The compressor and condenser fan

as well as the evaporator fan will remain off until

initialization defrost is complete. This initial defrost

cycle may take up to 15 minutes to complete, at which

time the freezing cycle will begin. The display will

continue to read DEF for an additional 30 minutes

before displaying temperature.

The control is located in the control box in the top of the unit

behind the hinged louvered front panel. Refrigerators are factory

set at mid-range to maintain about 38ºF (3ºC) box temperature.

Freezers are factory set at mid-range to maintain about 3ºF

(-18ºC) box temperature. To adjust for colder temperatures,

turn the knob clockwise. For warmer temperatures, turn the

knob counter-clockwise. Turn the knob fully counter-clockwise

to turn the refrigeration system off. Never turn the knob more

than 1 dial number and always allow 8 hours for temperature

stabilization before making any additional adjustments.

Refrigerator:

Whenever the refrigerator is plugged in, and the control has

completed initializing, the evaporator fans will operate as described

in the Evaporator Operation Section. The digital temperature will

display box temperature in degrees F. The temperature control

will cycle the compressor and condenser fan motor to maintain

box temperature at the control setting.

Refrigerator Defrost

The temperature control also monitors the evaporator temperature

and will turn off the compressor and condenser fan motor when

needed to allow accumulated frost on the evaporator to clear.

During this defrost cycle, the digital temperature display will

read dEF. After the defrost cycle is complete, the temperature

control will return to a normal cooling cycle, but the display

will continue to read dEF until the evaporator returns to normal

cooling temperatures (up to 15 minutes).

Energy Saver Switch

The energy saver switch is a rocker switch located next to the

thermostat knob that controls the amount of heat applied to the

door perimeter. The normal operating position for this switch is the

ON position, providing the least heat. If excessive condensation

is observed on the door opening, press the energy saver switch

to the OFF position, to increase the amount of heat (red portion

of the rocker switch will be visible). Note: This feature is not

present on Dual Temperature models.

Freezer:

Whenever the freezer is plugged in, and the control has completed

initializing including the initial defrost cycle, the evaporator

fans will run continuously (except during a defrost cycle) and

the digital temperature display will display box temperature in

degrees F. The temperature control will cycle the compressor

and condenser fan motor to maintain box temperature at the

control setting.

Freezer Automatic Defrost

The control also monitors compressor total running time and

will enter a defrost cycle after total compressor running time is

greater than 4-hours since the last defrost cycle OR if evaporator

coil temperature drops below -34ºF (-37ºC) (indicating excessive

frost on the coil.)

Freezer Manual Defrost

If a manual defrost is desired, simply unplug the unit for several

seconds, then plug unit back in. This will cause the control to

re-initialize and then enter a defrost cycle.

Electronic Temperature Control Operation

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Delfield SAF3S-S Specifications Page 16

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