P:\1doc\pman\cinst\TC156.DOC Page 2 of 4 Q1 2008 Issue 3
Unlocking stage by simply pressing
the and keys for a total of 10
seconds, at which time the symbol AA
is displayed. Program items which can
be accessed in the advanced menu are
indicated in the following table and are
explained under their appropriate
function headings.
Sett-
ing Def-
ault Value Shown
(adjustment range)
AA 14 Alarm Acknowledge/
Limit Start Time
tr 5 * * not applicable to this
model
Co/He Co Cooling or heating
mode
dt 1 Heater drain period
(0~12minutes)
Ft 1 Fan delay/ Pump down
time (0.0~4.0 min.)
dE/dg dE * Electric or Hotgas
defrost (electric only
available)
tE/rA tE* * not applicable to this
model
Sd/Hd Sd Show/Hide temperature
display during defrost
St 3 Time of first defrost
(0~23)
CA 0.0 Calibration Offset
(-9.9 to 9.9°C)
2b. A PROGRAMMING
EXAMPLE
A small fruit room needs to be
controlled at 1.0°C. We want a high
alarm at 9.0°C and a low alarm
at -2.0°C to indicate out of range
conditions. Being a small room, we
will set the alarm time to 60 minutes.
As we are energy conscious, we will
use the economy mode of operation.
We want two 45 minute defrosts per
day.
Step 1 Use the auto-setup to load
suitable settings:
•Unlock the TC1 using and
keys. Display reads UL, then...
•Display shows SP eg. 5.0.
•Decrease the setpoint by pressing
until 1.0 is displayed.
•Store the new setpoint with .
•dl (for differential) then Ec
(Economy mode * ) is displayed.
•Press and AU (Automatic
mode *) is displayed.
•Store the automatic setting with
key.
* There are three programming
options in differential dl :
Ec Economy mode - a method to
reduce energy usage whilst using the
internal limit start timer to protect the
compressor.
AU Auto setup - Default settings
(for all the programmable values)
based on your setpoint are loaded into
the TC1's memory.
0.5 to 5.0 Differential Temperature in
°
C - The specific temperature
required for the control. (See Cooling
and Heating Operations)
Step 2 The TC1 has stored close
values, but we now "fine tune" the
settings for our application:
•Unlock the TC1: and
•Display UL.
•SP then 1.0 is displayed, press
•dl then EC is displayed, press
.
•AH then 14 is displayed, decrease
the high alarm to 9.0 using
Store the new high alarm setting
with .
•AL then -4.0 is displayed,
increase the low alarm setting to
-2.0 using
•Store the new low setting using
•At then 90 is displayed, decrease
the alarm time delay to 60 using
, then store with .
•nd then 1 is displayed. We want 2
defrosts so press then to
store.
•dd then 30 is displayed, set the
defrost duration to 45 and store
with .
Step 3 Check our Settings
Press for 2 seconds, and our stored
values are automatically displayed.
The TC1 is now ready for operation.
3. COOLING AND
HEATING OPERATIONS
Heating and cooling control is between
the setpoint SP (cut in) and the
setpoint minus the differential dl (cut
out). For example: SP =10oC, dl
=1.0oC: control between 9.0oC and
10°C. Another example: SP = -10oC,
dl =3.0oC: control between -10oC and
-13oC.
The Heating and Cooling options HE
and Co [AA menu] select whether the
C1/C2 output controls heaters or
coolers. In heating mode there is no
limit start timer or defrost function and
programming options which relate to
defrosts will be skipped. If Cooling is
selected, a limit start timer protects
against short cycling the compressor.
The timer will prevent the cooling
output turning on for a period starting
the previous time the cooling output
turned on. Once this period has
elapsed the output is free to turn on as
required. The limit start period is the
units part of the AA (alarm
acknowledge) setting. For example
AA=4,14,24 etc. means a limit start
period of 4 minutes, AA=9,19,29,39
etc. means 9 minutes, AA=10,20,30
etc means 0 minutes or no limit start
delay.
C1/C2 comes on when cooling is
required.
The terminate/range temperature
function tE/rA referred to in
programming is not available in the
TC1 model.
4. ALARM
Where alarm lights, buzzers and
connection to a dialler system is
required, the TACm model should be
used.
The Alarm function has a high
temperature (in °C) setpoint, AH, a
low temperature (in °C), AL, and a
time delay, At. If either setpoint is
exceeded for longer than the time
delay an alarm will occur, indicated
solely by the display flashing. If
cooling mode is selected the low alarm
will occur in 1/4of the time delay At.
An Alarm Memory is shown by the
display flashing but the temperature
has returned to normal limits. In this
situation, an alarm has occurred but
the temperature has since returned to
normal operating limits. It may be
cleared by pressing the button.
5. DEFROST
The defrost duration dd is the time in
minutes in which the refrigeration is
switched off and the heaters are on.
Defrosts are spaced at equal periods
during the day and the number per day
is set by nd. For example, if nd = 2 a
defrost will occur every 12 hours.
A 24 hour clock sets the time of day
for defrosts.
Press to find out when the next
defrost will occur, td is displayed,
followed by the number of hours until
the next defrost. Similarly, pressing
displays Fd followed by the number
of hours since the last defrost
occurred. The decimal place represents
10 minutes, ie 2.4 is 2 hours and 40
minutes.
To initiate a Toggle Defrost, hold the
button for 1 second and either
