Cornelius COR40RRTMD - Manual (Page 11)

Reach-In Refrigerator Service Manual
© 2004, IMI Cornelius Inc. - 7 - Publication Number: 630460272SER
When the coil temperature reaches the proper temperature, the fan(s) will automatically start and
continue to run until it comes to the defrost cycle. The fan(s) may turn off if the doors are left open too
long during a loading period and the coil becomes warm. Do not call for service until the freezer is given
enough time to come down to the proper temperature. After the unit is put into operation, the fan(s) will
continue to operate until the storage area reaches a proper temperature (recommended average 38
o
F).
The red pilot on the front of the top grill should turn off after about an hour of operation or whenever the
sensing element reaches the prescribed temperature. Under some conditions the red warning light may
go on at the end of the defrost cycle. However, after the defrost cycle is ended, the temperature should
recover in a reasonable length of time and the red light will go out. The defrost periods are set at the
factory for 6 a.m. and 6 p.m. and may be changed if needed.
When the pin on the outer dial of the time clock is opposite the pointer, the defrost cycle will start. The
condensing unit and the blower fan shut off and the defrost heaters turn on. The heaters are located on
the coil. As soon as the coil has reached approximately 50
o
F and the coil is clear, the combination defrost
limit and fan delay switch will trip the timer solenoid and end the defrost cycle to put the system back into
the refrigeration cycle. The blower fan will remain off until the coil cools down to 20
o
F. If the limit switch or
solenoid should fail to terminate the defrost cycle, the inner fail safe dial will take over and terminate the
defrost cycle when the prescribed time is up. The length of the defrost cycle will vary depending on the
type of product stored in the cabinet, the number of door openings, and the atmospheric conditions. The
defrost cycle will usually take longer in the summer than in the winter. Before you make changes to the
length of the fail safe or the number of defrost periods, a competent service engineer should make a
complete study of all the contributing factors.
FIGURE 8