Federal ITD Series, Инструкция по установке и эксплуатации

Страница: 47 / 64

- 47 -
Defrost Cycle
The control is programmed to initiate defrost via two different methods. There are 3 programmed
defrost cycles in the case which will initiate a defrost cycle every 8 hours. The unit does not have a
time clock so the defrost cycles cannot be set for any specific time of day.
The unit also has an ‘On demand’ defrost feature that will initiate a defrost when the temperature
differential between the evaporator temperature and the air temperature is more than 20°F (11.1°C)
for 5 minutes after 30 minutes into the refrigeration cycle (e.g. if the air stream probe measures
42°F/5.6°C or greater and the defrost probe measures 20°F/-6.7°C or lower for five minutes). Once
initiated the defrost cycle will terminate when evaporator coil sensor reaches 43°F (6.1°C).
If a manual defrost is required, one can be initiated by pressing and holding the down arrow for
three (3) seconds. This is typically unnecessary and should only be performed if special
circumstances require it.
Control Parameters
Table 3 - Control Parameters
Parameter Description

Control Setpoint

1
2 3 4 5 6 7 8 9
Compressor Cut in [°F] 38.0
Compressor Cut out [°F]
32.0 31.0 30.0 29.0 28.0 27.0 26.0 25.0 24.0
Compressor Min On Time 2 min
Compressor Min Off Time 2 min
Compressor Max Run Time 60 min
Defrost Termination Temp [°F] 43.0
Time to first defrost 8 hr
Time to subsequent defrost 8 hr
Defrost duration
30 min
Defrost on demand differential [°F] 18.0
Delay for defrost on demand 5 min
Time delay to the next defrost on demand 30 min