Technical data

Technical Manual Cold Storage Controllers TKP / TKC x130 - x140 Page 19
Evaporator Fan Control
For one or all of the 4 circuits it is possible to assign a relay for the
evaporator fan. The fan control depends on the following parameters:
•„
cooling mode “ (mode page)
The fan is controlled from the N/O-contact in refrigeration
mode and from the N/C-contact in freezing mode.
•„ fan operation “ (mode page)
You can select either „permanent“, where the fan runs
continously and stops only during electric defrost, or
select „interval“, where the fan runs during cooling periods
only.
•„ defrost type “ (defrost page)
If „on“: fan turns during defrost
If „off“: fan ist stopped during defrost.
Fan off delay
To use latent energy of the ice and evaporator block the fan can turn
up to 30 minutes after the cut-off of the valve or compressor („ fan off
delay “, setpoint page).
Fan operation modes, defrost termination using electric heaters
Fan trailing delay
The start-up time delay for the fan after defrosting is set with
parameter „ fan start delay “ (setpoint page). This avoids that water
drops will be blown into the chamber. " rem fandelay 1 " thru " rem
fandelay 4 " (actual page) show the remaining time up to the fans in
the single circuits will be switched on.
Examples for fan operation modes
1.
fan in permanent mode
This mode is mainly used with refrigerated shelfs, refrigerated
display counters and chest freezers, where the fan runs even
during defrost. It is not necessary to connect the fans to a relay
of the controller, fans run directly from mains voltage.
" fan operation " is set to 'permanent', " defrost type " is set to
'on' and " pause aft. defr " is set to '0'.
2. fan in interval mode, defrost by fan
In use for cold storage chambers with higher temperatures.
Use a relay output for the fan. In this case you select „ fan
operation “='interval' and „ defrost type “='on'.
3. fan in interval mode, defrost by electric heater/hot gaz:
In use for cold storage chambers with lower temperatures
and freezers. Use a relay output for the fan. In this case you
select „ fan operation “='interval' and „ defrost type “='off'.
The fan runs when cooling is on. The fan is disabled during
defrost periods and comes on after defrost with a time delay
which is set by the „ fan start delay “ parameter.
4. fan in permanent mode and defrost by electric heater
Use a relay output for the fan. In this case you select „ fan
operation “='permanent' and „defrost type“='off'. Then the fan
will run continously and stops during a defrost period only.
The fan comes on after defrost with a time delay which is set
by the „ fan start delay “ parameter.
Please note that the fan relay contacts change with the application
(refrigeration/freezing).
interval fan
electric heater
interval fan
airflow defrost
permanent fan
electric heater
OFF
OFF
ON
OFF
ON
fan off delay
limitation temp.
evap temperature
defrost
ON
OFF
ON
coolin
g
OFF
ON
1. "pause aft. defr"
(drain time)
21
2. "fan start
delay"
defrost ends
defrost starts
refri
g
. relay
coolin
g
mode=
refri
g
-
eration
M
L
fan relay
refri
g
.relay
coolin
g
mode=
freezin
g
M
L
fan relay