Control Menu Loop

From the Control Menu you may select the Setpoints and Tuning menu loops. The controller is programmed to require level 1 password authorization to enter the menu screens (see Section 3.2.1). Once password access is granted, the user may select and adjust set points and control loop tuning parameters.

Press Enter ( ) Key To

PRECOOL TEMP: 61.3°F TUNING MENU

PRECOOL TEMP: 88.3°F

Press ( ) or ( ) arrow key to

* NOTE: Display screens shown with a dashed border appear only if the applicable feature is enabled.

(Oct, 2011)

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CONTROL TUNING

SETPOINTS

TUNING

Allows modifi cation of basic operating set points. Level 2 password is needed to enter this menu loop.

SETPOINTS REACTIVATION DISCHARGE

SETPOINT

135.0°F

Reactivation discharge air temperature setpoint. Temperature of the reactivation air after it passes through the reactivation segment of the rotor.

SETPOINTS REACTIVATION HEATER

SETPOINT

290.0°F

Reactivation heater temperature set point for the air entering the rotor. This screen appears for gas and electric reactivated units. This screen may appear for steam reactivated units if the unit is optionally confi gured to utilize the heater temperature with the control method.

SETPOINTS DISCHARGE RELATIVE

HUMIDITY SETPOINT

10.0%

Process supply relative humidity set point for the air leaving the unit or the relative humidity set point for the conditioned space (dependent on sensor location).

SETPOINTS PRECOOL/PREHEAT

SETPOINT

55.0°F

Process supply temperature set point for the air leaving the pre-cooling and/or pre-heating coils. This screen only appears for units confi gured with optional pre-cooling and/or pre-heating.

SETPOINTS POSTCOOL/POSTHEAT

SETPOINT

68.0°F

Process supply temperature set point for the air leaving the post-cooling and/or post-heating coils. This screen only appears for units confi gured with optional post-cooling and/or

post-heating when using cascade control (reference Sections 4.2.8.1, E and 4.2.8.2, E).

SETPOINTS STATIC PRESSURE

SETPOINT

500mI Static pressure set point in mI (milli Inches) for the process supply air leaving the unit or static pressure of the conditioned space (dependent on sensor location).

SETPOINTS DISCHARGE TEMPERATURE

SETPOINT

68.0°F

Used only with post-heating and/or post-cooling, this screen displays the process supply temperature set point for the air leaving the unit, or set point temperature of the

conditioned space (dependent on sensor location).

5.5.2 Tuning

CONTROL SETPOINTS

TUNING

SETPOINTS

Allows adjustments to P/I (proportional/Integral) and digital (On/Off) control parameters. Level 2 password is needed to enter this menu loop. Tuning parameters vary depending on the unit type and confi guration. Refer to Section 4.2.3 for detailed descriptions of the modifi able tuning parameters and how adjustments made in these screens affect the functions they control.

5.5.2.1 Adjustable P/I Parameters

For each proportionally controlled function, a tuning screen is available for making adjustments. Only screens that apply to enabled features will appear in the display. Examples of the screens available for P/I controlled functions appear below:

(Adjustable parameters are shown with bold text.)

TUNING MENU

The reactivation discharge air temperature is one of three input variables used by the controller to manage the reactivation heater. It is the temperature of the air leaving the reactivation segment of the rotor (after it has been used to reactivate the rotor).

TUNING MENU

The reactivation heater temperature is also an input variable used to manage the

reactivation heater. It is the temperature of the air from the heater (measured as it enters the reactivation segment of the rotor).

TUNING MENU

The next Tuning display screen varies depending on the reactivation control method. It is also an input variable for managing reactivation heat. The screen shown allows

adjustments to the humidity control loop for the H-Trac reactivation control method. A similar screen is available for adjusting the dewpoint control loop if your unit is confi gured for Dew-Trac or C-Trol II.

TUNING MENU PRECOOL SP: 55.0°F PB: 40.0°F

ERR DB: 0.6°F IT: 100 ACTION:FORWARD

OFFSET: 0.2°F WSP: 55.2°F LOOP OUTPUT: 100.0%

PRECOOL TEMP: 61.3°F

TUNING MENU PREHEAT SP: 55.0°F PB: 40.0°F

ERR DB: 0.6°F IT: 100 ACTION:REVERSE

OFFSET: 0.2°F WSP: 54.8°F LOOP OUTPUT: 100.0%

OFFSET: 0.1°F WSP: 67.9°F LOOP OUTPUT: 0.0%

POSTHEAT TEMP: 88.3°F TUNING MENU

Refer to Section 4.2.7. Pre and Post air treatment options are proportionally controlled. If the option is enabled, a tuning display screen is available to make adjustments. When a unit is equipped with Pre-cooling and Pre-heating for example, they both share a set point, 55 °F in this example. To prevent the cooling and heating control loops from outputting at the same time and trying to achieve the same set point, an offset is entered for each loop so that each function has a unique set point. If a 0.2 °F offset is entered for each loop, the displayed cooling loop working set point (WSP) becomes 55.2 °F and the heating loop WSP becomes 54.8 °F.

TUNING MENU

If static pressure control is enabled, the process blower motor is equipped with an optional VFD. With this, the blower speed may be varied from 30% to 100% of the motor’s full rated RPM. A static pressure sensor is required to provide an input signal to the system

controller. The controller manages process blower speed to maintain the static pressure to the set point with the tuning parameters entered in this screen.

(Oct, 2011)

5.5.2.2 Adjustable Digital Parameters

For functions that utilize digital (On/Off) control, screens are available to adjust the digital control values. Examples of the screens available for digital controlled functions appear below:

TUNING MENU REACT HEATER STAGING

CUT IN CUT OUT

% %

% %

% %

% %

% OF LOOP OUTPUT

The CUT IN value is the point at which the function is enabled. The CUT OUT value is the point at which the function is disabled. In this case, heating stages are enabled based on the CUT IN value in % and disabled based on the CUT OUT value in %. These values correspond to the control loop output for the reactivation heater.

TUNING MENU ENABLE REACTIVATION ENERGY SAVINGS: YES CUT OUT: 5.0%

DIFFERENTIAL: 4.0%

LOOP OUTPUT: 100.0%

IDLE TIMER: 20 MIN

Available with P/I reactivation control methods, the Energy Savings feature disables all reactivation functions (reactivation heater, reactivation blower, rotor rotation drive motor) when dehumidifi cation is not required. The controller may be programmed to begin the Energy Savings mode by the parameters entered in this screen. If the controller’s reactivation control loop output (displayed) remains below the entered cut-out set point during the period entered for the idle timer, reactivation is disabled. The idle timer can be set from 1 to 50 minutes (factory default is 20 minutes). Once the displayed loop output rises above the Energy Savings differential value entered, all reactivation functions are re-enabled and the idle timer resets.

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