8C-PAIH52 Honeywell

Using Accutune with Duplex (Heat/Cool) Control

“TUNE” can be done for applications using Duplex (Heat/Cool) control.

During tuning, Accutune II assumes SP 1 will cause a Heating demand, and then the calculated tuning 

parameters will be automatically entered as the first set of PID constants. Likewise, it assumes tuning at 

Local SP 2 will cause a Cooling demand, and the cooling parameters will be entered as the second set of 

PID constants.

Procedure

After “TUNE” has been enabled in the Tuning Set Up group as described in section 4, use the procedure in 

82HTable 5-24 to start tuning. Note that control group parameter “SP SOURC” must be set to “2LOCAL” to 

enable the second setpoint.

To abort tuning in progress, press the MAN/AUTO key to take the recorder out of Auto mode. The 

message “AbRT” (abort) will be displayed as the value of Tuning Set Up group parameter “AT ERR”. The 

tuning parameters will retain the values they had at the start of the Accutune operation.

Table 5-24 Procedure for using Accutune for duplex control

Step Press Action/Result

Heating Tuning

1 DISP Until you see Setpoint 1.

Lower Display: SP nnn

2

or

Until the value of Setpoint 1 is at the desired value within the Heat 

zone.

Make sure the recorder is in Auto mode. (“A” indicator lit.)

If not, use the MAN/AUTO key to put the unit in Auto.

3 DISP Until you see

Lower Display: UseSPn

This is the prompt used to select the setpoint. If it is not 

“USESP1”, use or to switch to “USESP1”.

4 DISP Until you see

Lower Display: TUNExOFF x = 1 or 2

If “TUNExOFF” (tune off) does not appear, then Accutune is not 

enabled.

5

or

to toggle to

Lower Display: TUNExON x = 1 or 2 

Tuning will begin and the lower display will flash “TUNING”. The 

output will cycle between 50% and 100% (or high output limit). 

When tuning has been completed the lower display will again 

show “TUNExOFF”. The Heat tuning parameters are entered for 

the first set of PID constants in the Tuning Set Up group

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