Greenheck Microprocessor Controller v3.0 (469690) - Manual (Page 10)

10
Access the OVERRIDES menu through the Main Menu. Scroll through the menu screens using the keys.
***ACCESS DENIED***
Enter Password:0000
WRONG PASSWORD
T HIS SCREEN CAN BE LOCKED TO PREVENT TAMPERING WITH THE SETTINGS .
F
ROM 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)
T
HE
O
VERRIDE
M
ENU 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”.