24
b) Freezer
Defrost timer terminates
Legend:
Comp
-compressor
ConFM
-condenser fan motor
CTh
-cabinet thermistor
DB
-display board
DH
-defrost heater
DTh-
defrost thermistor
EvapFM
-evaporator fan motor
2. Cool Down
3. Cool Down Achieved
Comp
energized
ConFM
energized
EvapFM
energized
CTh in control
2.5 min.
Comp Delay
CTh cools
to 3°F (1.7°C)
below setpoint
CTh w
ar
ms
to 3°F (1
.7°C)
abo
ve setpoint
5. Defrost
EvapFM
energized
(if dip switch 7 or 8 on)
Comp
de-energized
ConFM
de-energized
EvapFM
de-energized
(if dip switch 7 and 8 off)
DTh warms to
100°F (38°C)
Note:
• 2.5-minute minimum compressor on and off time.
• Evaporator fan motor de-energizes when door is open.
• 20-minute minimum defrost time.
• 1-hour maximum defrost time.
• Perimeter heater controlled by perimeter heater switch
(except RFH1-SSB(-HS)(-HSE)).
• Glass door (-GD models) heater controlled by glass door
heater switch.
• RFH1-SSB(-HS)(-HSE): Perimeter heater and mullion heater
are controlled through the control board and turn on and off
with compressor when S3 dip switch 8 is in the off position.
• Models may utilize any combination of the following heaters:
Condensate Pan Heater, Cord Heater, Drain Heater, Duct
Heater, and Glass Tube Heater. See "VII.Wiring Diagrams"
for specific model details.
DTh in control
DH
energized
Comp
de-energized
ConFM
de-energized
EvapFM
de-energized
EvapFM
energized
(if dip switch 7 or 8 on)
2.5-min. Comp
on timer starts
4. Cool Down Restart
DH
de-energized
5-min. delay timer starts
after defrost heater
de-energizes
6. Cabinet Cool Down Defrost Recovery (Drip Time)
to 6 below
from 5 above
Comp
energized
ConFM
energized
Evaporator temperature
drops below 70°F (21°C)
Display changes from "dEF"
on DB to cabinet temperature
when CTh drops to 15°F
(8.3°C) or less above setpoint.
To 2 above
2.5-min. Comp off
timer starts
"RI-A" Control Board
Freezer Sequence Flow Chart
Comp
energized
ConFM
energized
EvapFM
energized
DTh at or above
100°F (38°C)
1. Startup
from 6 below
DH
de-energized