Greenheck Microprocessor Controller v3.0 (469690) Manual de usuario descargar pdf (Pagina 10)

Access the OVERRIDES menu through the Main Menu. Scroll through the menu screens using the keys.

***ACCESS DENIED***

Enter Password:0000

WRONG PASSWORD

THIS SCREEN CAN BE LOCKED TO PREVENT TAMPERING WITH THE SETTINGS.

FROM THE FACTORY, ACCESS IS NOT PASSWORD PROTECTED TO ALLOW QUICKER

START-UP.

To set the password, go to the ‘PROGRAM’ menu by pressing the button. Once

there, scroll down until you arrive at the Change Password screen. The ‘Level 1’

password protects the ‘OVERRIDES’ Menu.

Manual override of

control loops

(Unit must be ON)

THE OVERRIDE MENU IS USED FOR MANUAL OVERRIDE OF THE CONTROL LOOP.

THE USER CAN OVERRIDE THE ENERGY RECOVERY WHEEL OPERATION.

This screen only appears if there is not a VFD operating the energy wheel.

When the wheel is in MANUAL mode, use the arrow buttons to turn the wheel ON or

OFF.

Energy recovery

wheel override

Wheel:AUTO

Wheel:OFF

THE USER CAN OVERRIDE THE ENERGY RECOVERY WHEEL OPERATION.

This screen only appears if the Modulating Wheel Frost Control or Modulating Wheel

Economizer was provided with the unit.

When the wheel is in MANUAL mode, use the arrow buttons to change the % Speed to

vary the wheel rotational speed. The % Speed is directly proportional to a 0-10V signal

being sent to the energy wheel VFD.

Energy recovery

wheel override

Wheel:AUTO

% Speed:000%

THE USER CAN OVERRIDE THE COOLING LOOP OPERATION.

This screen only appears if a cooling option was provided with the unit.

When the cooling loop override is in MANUAL mode, use the arrow buttons to vary the

% output.

Chilled Water Coil: Loop Output % is directly proportional to a 0-10 VDC or 2-10 VDC

signal.

000% = 0 VDC = Full Closed; 100% = 10 VCD = Full Open

000% = 2 VDC = Full Closed; 100% = 10 VCD = Full Open

2 Stage DX Coil: Loop Output displays compressor engagement as a percent.

000% Compressor OFF

050% First Compressor ON

100% First & Second Compressor ON

Second stage will NOT disengage until Loop Output is below 50%

First stage will NOT disengage until Loop Output is 0%

1 Stage DX Coil: Loop Output displays compressor engagement as a percent.

000% Compressor OFF

100% Compressor ON

In a single stage DX cooling system, the compressor engages when the Loop Output is

100%. Once the compressor is engaged, it will not disengage until the Loop Output is

0%.

Note: Damage can occur to compressors from short-cycling, therefore the controller

has built-in time delays which are effective upon each engagement of a compressor.

Cooling loop

override.

Cooling:AUTO

Loop output:000%

MANUAL OVERRIDE MENU

To manualy override a function, change the status “AUTO” to “MANUAL”.

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Greenheck Microprocessor Controller v3.0 (469690) Manual de usuario Pagina 10

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