1°C (only with =SN4): measuring range -50/-9.9 … 19.9/80°CINP
2°C : measuring range -50 … 120°C
°F : measuring range -55 … 240°F
Caution: upon changing the value, it is then necessary to reconfigure the parameters relevant SCL absolutely
to the absolute and relative temperatures ( , , SPL SPH SP, , ALA AHA, etc..)
SPL -50..SPH Minimum limit for SP setting (-5°C)
SPH SPL.120° Maximum limit for SP setting (5°C)
SP SPL... SPH Setpoint (value to be maintained in the room). (0.0°C)
C-H REF; HEA Refrigerating (REF) or Heating (HEA) control mode
HYS 1...10° OFF/ON thermostat differential (3°C)
CRT 0...30min Compressor rest time. The output is switched on again after CRT minutes have elapsed since the previous
switchover. We recommend to set CRT=03 with HYS<2.0°. (3)
Thermostat output run when probe T1 is faulty. With
=0 the output will always remain OFF.
Thermostat output stop when probe T1 is faulty. With
>0 the output will always be ON.
= 6: In case of probe T1 failure, the compressor will cycle 4 minutes ON and 6 minutes
CSD 0..30min Compressor stop delay after the door has been opened (active only if DS=YES). (1)
DFR 0... 24(1/24h) Defrost frequency expressed in cycles/24 hours. (3)
DLI -50...120° Defrost end temperature. (6°C)
DTO 1...120min Maximum defrost duration. (20)
OFF: off cycle defrost (Compressor and Heater OFF).
ELE: electric defrost* (Compressor OFF and Heater ON).
GAS: hot gas defrost* (Compressor and Heater ON).
* The defrost output is active if only OAU=DEF.
DDY 0...60min Display during defrost. If DDY DDY=0 during defrost the temperature continues to be displayed. If > 0, during
defrost the display shows DEF, when defrost is over REC is displayed during DDY minutes. (10)
Alarm threshold management.
NON: all temperature alarms are inhibited (the following parameter will be ADO).
ABS: the values programmed in ALA AHA and represent the real alarm thresholds.
REL: the values programmed in and are alarm differentials referred to and ALR AHR SP SP+HY.
ALA -50... 120° Low temperature alarm threshold. (-50°C)
AHA -50... 120° High temperature alarm threshold. (120°C)
ALR -12... 0° Low temperature alarm differential. With =0 the low temperature alarm is excluded. ALR (0°C)
AHR 0... 12° High temperature alarm differential. With AHR=0 the high temperature alarm is excluded. (0°C)
ATD 0... 120min Delay before alarm temperature warning. (30)
ADO 0... 30min Delay before door open alarm warning. (5)
Condenser periodic cleaning. When the compressor operation time, expressed in weeks, matches the ACC
value programmed, “CL” flashes in the display. With ACC=0 the condenser cleaning warning is disabled. (0)
Stand-by button enabling . (YES)
DS NO/YES Door switch input enabling (closed when door is closed). (NO)
NON : output disabled (always off).
0-1 : the relay contacts follow the on/standby state of controller.
DEF: output programmed for defrost control.
LGT : output enabled for light control.
ALR : contacts make when an alarm condition occurs.
Temperature sensor selection. With
, the probes must be the Intermatic models SN4..; with
ST1, the probes must be the Intermatic models ST1...
OS1 -12.5..12.5°C Probe T1 offset. (0°C)
T2 NO/YES Probe T2 enabling (evaporator). (NO)
OS2 -12.5..12.5°C Probe T2 offset. (0°C)
TLD 1...30 min Delay for minimum temperature (TLO) and maximum temperature (THI) logging. (5)
SIM 0...100 Display slowdown. (0)
ADR 1...255 AT1-5 address for PC communication. (1)
■Insert the controller through a hole measuring 71 mm x 29 mm.
■Make sure that electrical connections comply with the paragraph “wiring diagrams”. To reduce the effects of electromagnetic disturbance,
keep the sensor and signal cables well separate from the power wires.
■Fix the controller to the panel by means of the suitable clips, by pressingly gently; if fitted, check that the rubber gasket adheres to the
panel perfectly, in order to prevent debris and moisture infiltration to the back of the instrument.
■Place the probe T1 inside the room in a point that truly represents the temperature of the stored product.
■Place the probe T2 on the evaporator where there is the maximum formation of frost.
During normal operation, the display shows either the temperature measured or one of the following indications:
DEF Defrost in progress HI Room high temperature alarm
REC LORecovery after defrost Room low temperature alarm
OFF Controller in stand-by E1 Probe T1 failure
CL E2Condenser clean warning Probe T2 failure
The information available in this menu is:
T1 TLOInstant probe 1 temperature Minimum probe 1 temperature recorded
T2 CNDInstant probe 2 temperature Compressor working weeks
THI Maximum probe 1 temperature recorded LOC Keypad state lock
Access to menu and information displayed.
■Press and immediately release button .
■With button or select the data to be displayed.
■Press button to display value.
■To exit from the menu, press button or wait for 10 seconds.
Reset of THI, TLO, CND recordings
■With button or select the data to be reset.
■Display the value with button .
■While keeping button pressed, use button .
SETPOINT (display and modifi cation of desired temperature value)
■Press button for at least half second, to display the setpoint value.
■By keeping button pressed, use button or to set the desired value (adjustment is within the minimum and the maximum SPL
■When button is released, the new value is stored.
Button , when pressed for 3 seconds, allows the controller to be put on a standby or output control to be resumed (with SB=YES only).
The keypad lock avoids undesired, potentially dangerous operations, which might be attempted when the controllers is operating in a public
place. In the INFO menu, set parameter =YES to inhibit all functions of the buttons. To resume normal operation of keypad, adjust setting LOC
Timed defrost. Defrosting starts automatically when necessary time has elapsed to obtain the defrosting frequency set with DFR. For
example, with =4 defrosting occurs once every 6 hours. The internal timer is set to zero when power is applied to the controller and at DFR
each subsequent defrost start. When the controller is put on a standby, the accumulated time count is “frozen” (is not incremented).
Manual defrost. Defrosting may also be induced manually by keeping the button pressed for 2 seconds.
Defrost type. Once defrost has started, Compressor and Defrost outputs are controlled according to the parameters DTY and OAU. The AUX
output is associated to defrost function with OAU=DEF exclusively.
Defrost termination. Defrost lasts as long as time DTO but, if the evaporator probe has been enabled (T2=YES) and temperature DLI is
achieved before this time elapses, defrost will be terminated in advance. Caution: if =HEA all defrost functions are inhibited; if DFR=0 C-H
the timed defrost function is excluded; during defrost, the high temperature alarm is inhibited.
■The setup menu is accessed by pressing button + for 5 seconds.
■With button or select the parameter to be modified.
■Press button to display the value.
■By keeping button pressed, use button or to set the desired value.
■When button is released, the newly programmed value is stored and the following parameter is displayed.
■To exit from the setup, press button or wait for 30 seconds.
Thank you for having chosen an Intermatic electronic product. Before installing the instrument, please read these instructions carefully to
ensure maximum performance and safety.
AT1-5 INSTRUCTIONS FOR USE
AT1-5…E 230Vac±10%, 50/60Hz, 3W
AT1-5…U 120Vac±10%, 50/60Hz, 3W
AT1-5…D 12Vac±10%, 50/60Hz, 3W
AT1-5.Q1(2)… compressor 12(4)A
AT1-5.S1(2)… compressor 16(4)A
AT1-5.Q3(4)… compressor 12(5)A
AT1-5.S3(4)… compressor 16(5)A
AT1-5.Q5(6)… compressor 12(8)A
AT1-5.S5(6)… compressor 16(8)A
Auxiliary loads 7(2)A 240vac
AT1-5.Q… maximum total current 12A
AT1-5.S… maximum total current 16A
NTC 10K�@25°C, Intermatic part No. SN4...
PTC 1000�@25°C, Intermatic part No. ST1…
-50 / -9.9 … 19.9 / 80°C (with NTC10K only)
<0.5°C within the measurement range
-10 … +50°C; 15%...80% r.H.
CE – UL (Approvals and Reference Norms)
Intermatic Customer Service:
Manual defrost / Decrease button
Increase / manual activation button
■Disconnect power at the circuit breaker(s) or disconnect switch(es) before installing or servicing.
■More than one circuit breaker or disconnect switch may be required to de-energize the equipment before servicing.
■Installation and/or wiring must be in accordance with National and Local Electrical Code requirements.
■The device shall be installed in compliance with the enclosure, mounting, spacing and segregation requirements of the ultimate enclosure.
Risk of Fire or Electric Shock
Temperature alarm with relative thresholds,
refrigerating control (ATM=REL, C-H=REF).
Temperature alarm with relative thresholds,
heating control ( =HEA). ATM=REL, C-H
Refrigerating control (C-H=REF ) Heating control (C-H=HEA)
