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A421 Series Standard Electronic Temperature Controls Installation Instructions

10

Viewing and Changing Values in the Basic Menu

To access the Basic menu and view and change the 
Basic parameter values, follow these steps:

To exit the Basic menu and go directly into the 
Advanced menu, simultaneously press 

 and 

, and 

hold them for 5 seconds.

Advanced Menu

The Advanced menu allows you to change the 
parameter values in the Basic menu and the parameter 
values for the Advanced parameter codes; including 
Temperature Units (

Un

), Temperature Setback (

tSb

), 

Sensor Offset (

So

), High Temperature Setpoint Stop 

(

HtS

), Low Temperature Setpoint Stop (

LtS

), and 

Backlight Level (

bLL

). 

See 

Parameter Codes and Modes of Operation

 and 

Table 4 for more information regarding parameter 
codes, usable parameter values, and default values. 

1.

With the Main screen displayed, 
press 

MENU

. The LCD displays 

OFF

which is the first parameter code 
screen displayed in the Basic menu.

2.

Press 

 or 

 to scroll through all of 

the Basic

 

parameter codes and 

display the preferred code. 

3.

With the preferred parameter code 
displayed, press 

MENU

 to display the 

current parameter value for the code.

4.

With the current parameter value 
displayed, press 

 or 

 to scroll 

through all of the parameter’s usable 
values and display the preferred 
value.

5.

With the preferred parameter value 
displayed, press 

MENU

 to save the 

displayed value and go to the next 
parameter code.

Figure 7: Navigating the Basic Menu (Factory 

Default Values Shown)

38

o

F

OFF

On

25

o

F

35

o

F

Figure 8: Navigating the Advanced Menu 

(Factory Default Values Shown)

Содержание A421ABC-02C

Страница 1: ...A421 control could lead to personal injury or property damage to the controlled equipment or other property additional precautions must be designed into the control system Incorporate and maintain ot...

Страница 2: ...is connected to a standard A421 control the range of usable values is restricted by the control to 40 to 212 F 40 to 100 C See Wiring Technical Specifications and refer to the A99B Series Temperature...

Страница 3: ...rness between the enclosure base and cover more than 180 Wiring WARNING Risk of Electric Shock Disconnect or isolate all power supplies before making electrical connections More than one disconnection...

Страница 4: ...l does not provide any internal power to the TB2 terminals or relay contacts The A421 control simply energizes and de energizes the relay to open and close the contacts based on the On OFF temperature...

Страница 5: ...d Wire Sizes TB1 24 VAC Models LN Low Voltage 24 VAC Control Power Common Connect the 24 VAC supply power to operate the control 28 AWG to 12 AWG 0 08 mm2 to 4 0 mm2 24V Low Voltage 24 VAC Control Pow...

Страница 6: ...12 AWG 0 08 mm2 to 4 0 mm2 LNO Line Voltage SPDT Relay Normally Open Contact Connects controlled equipment to the Line Voltage Normally Open LNO contact on the SPDT relay When LC is closed to LNO the...

Страница 7: ...and the green LED goes off The range of usable temperature values is 40 to 212 F 40 to 100 C in 1 increments Relay On Temperature On Select the temperature at which the output relay energizes the LC t...

Страница 8: ...ode the effective On and OFF setback values On tBs and OFF tBs can be greater than the selected HtS value or less than the selected LtS value Temperature Setback tSb Select a temperature value for set...

Страница 9: ...gh all of the available parameter values for the associated parameter code With the preferred parameter value displayed press MENU to save the value and go to the next parameter code screen Note If yo...

Страница 10: ...Modes of Operation and Table 4 for more information regarding parameter codes usable parameter values and default values 1 With the Main screen displayed press MENU The LCD displays OFF which is the f...

Страница 11: ...On value automatically shifts equal to the OFF value adjustment The OFF value can only be adjusted to values that maintain the entire control band within the restricted temperature adjustment range de...

Страница 12: ...OFF value and return to the OFF code screen 5 Press and simultaneously to return to the Main screen Troubleshooting Fault Codes A421 Series controls display fault codes on the LCD as described in Tabl...

Страница 13: ...ad from the output relay terminals b Ensure that the Parameter Adjustments jumper is installed so that access to adjust parameters is unrestricted c Reconnect the sensor leads and supply power to the...

Страница 14: ...l Type 4X NEMA IP66 watertight enclosure for surface mount applications Rated for 120 240 VAC Includes an A99BB 200C temperature sensor with 6 6 ft 2 0 m cable A421GBF 02C Low Voltage Type 1 Electroni...

Страница 15: ...erating temperature range 40 to 248 F 40 to 120 C A99CB 200C PTC Temperature Sensor Extended probe 6 in 15 2 cm with 6 6 ft 2 0 m PVC cable Ambient operating temperature range 40 to 212 F 40 to 100 C...

Страница 16: ...lass B limits Europe CE Mark Johnson Controls Inc declares that this product is in compliance with the essential requirements and other relevant provisions of the EMC Directive Low Voltage Directive A...

Страница 17: ...rd A421 control model the range of displayed temperature values is 40 to 212 F or 40 to 100 C The performance specifications are nominal and conform to acceptable industry standards For application at...

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