Welbilt Delfield 4000P Series, Installation, Operation And Maintenance Manual

Part Number: 9294045C  03/22 13

Section 3 

Operation

Electronic Temperature Control Location & Adjustment

Location

The Carel temperature control is mounted in a junction box 

on the back of the unit that includes the thermistors and 

power cord.

Start-up

At initial start-up or anytime power is disconnected and 

then reconnected to the unit, the control will start the unit 

in defrost.

Defrost

Defrost can be terminated and initiated by pressing 

the snowflake button. Display freezes the last cabinet 

tempurature recorded until defrost is completed and the 

cabinet reaches set point again.
The unit can be turned on and off by pressing the on/off 

button on the control.

Set Point Adjustment

To adjust the set-point temperature, press and hold the set 

button until the current set point appears and is blinking 

on the screen.  Press the down or up arrows to adjust to the 

desired temperature.  Press the set button again to save the 

temperature.

Factory set point:

407p Freezer  

-1.5°F

406p/4048 Cooler 

33°F

Error Codes
LED 

Flashes: This means there is a function that is being 

delayed by a timer/external signal or disabled by another 

process that is already going on.  For example, the 

compressor icon will flash if the cabinet temperature is 

above the cut-in temperature, but the control hasn’t met 

the minimum compressor off-time.

E0:

 Air probe error

E1: 

Coil probe error

LO: 

Low temperature alarm (-20°F for 90 minutes)

HI:

 High temperature alarm (+20°F for 90 minutes)

Ef: 

Unit operating on parameter error

Ed: 

Defrost ended on timeout rather than by temperature

Controls/Programming/Settings

R290 REFRIGERATORS

The control will initiate a defrost at start up. This defrost will 

continue up to 41°F or a minimum runtime of 1 minute/

maximum runtime of 75 minutes. The evaporator fans will 

run continually during the operation of the unit. There will 

be no drip time after the defrost. The compressor powers 

on immediately after reaching defrost termination temp. 
When the control calls for cooling, a minimum compressor 

on time is 2 minutes. Condensing unit/evaporator fans 

power on and the normal cooling cycle continues. 
Defrost will initiate after 6 hours of actual time (note: this 

is not running time). Display freezes the last cabinet temp 

recorded until defrost is completed and the cabinet reaches 

set point again.