Honeywell DR4300 manual Using Accutune with Duplex Heat/Cool Control

Appendix D - Using Accutune II

D.3 Using Accutune with Duplex (Heat/Cool) Control

Introduction

“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 Table D-2to start tuning. Note that control group parameter “NumSPs” must be set to “TWO” to enable the second setpoint.

To abort tuning in progress, press the MAN/AUTO/RESET 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 D-2 Procedure for Using Accutune for Duplex Control

Step		Press			Action/Result
Heating Tuning
1			Lower Display		Display Setpoint 1.
		DISP
			SP nnn
	until you see
2			Until the value of Setpoint 1 is at the desired value within the Heat
		or	zone.
			Make sure the recorder is in Auto mode. (“A” indicator lit.)
			If not, use the MAN/AUTO/RESET key to put the unit in Auto.
3			Lower Display
		DISP
			UseSPn	This is the prompt used to select the setpoint. If
			it is not “USESP1”, use		or to switch to “USESP1”.
	until you see
4			Lower Display
		DISP
			TuneOF	If “TuneOF” (tune off) does not appear, then
				Accutune is not enabled.
	until you see
5			to toggle to
		or	Lower Display
			TuneON	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
				“TuneOF”. The Heat tuning parameters are
				entered for the first set of PID constants in the
				tuning set up group.

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