Unit installation

CDU Installation Guide Page 27
Cooling Distribution Unit
OPERATION (continued)
Use the & keys to scroll through the options within the ‘Status’ screen - refer to the ‘Controller
Menu Summary’ in Section 6.2 for detail on the viewable information that can be displayed. When a
title is highlighted, press the key to view the associated information.
Example 1: By selecting the ‘Heat Exchanger’ title (screen ref. 3-2) and pressing , the screen
below will be displayed.
* This figure will show the ‘Fixed’, ‘Dew Point Tracking’ or ‘Ambient Tracking’ set points as a steady
state display. If Dew Point Override is active, then this figure will alternate between the Fixed Set point
and the Override value.
Example 2: By selecting the ‘IO Status’ title (screen ref. 3-12) and pressing , then selecting
‘Digital I/O’ + , the screen below will be displayed.
Reading from left to right the digital I/O are:
Digital Inputs Digital Outputs
- Reservoir tank level switch - Pump P1 contactor (inverter drive)
- Inverter fault - Pump P2 contactor (inverter drive)
- Flood tray float switch - Pump P1 contactor (DOL)
- Pump 1 DOL overload - Pump P2 contactor (DOL)
- Pump 2 DOL overload - Inverter drive enable signal
- Start/Stop push button - Inverter drive fault reset
- (not used) - Level 1 fault alarm
- Fill pump push button - Level 2 fault alarm
- Pulse from primary flow meter - Fill pump P3
- (not used)
Note:
The solitary number at the far right of the 1
st
line (digital inputs), signifies whether 24v supply is present (0 = no 24v)
on the controller motherboard. This should be checked if there is ever a complete control failure.
To return to the welcome screen, repeatedly press the key.
ESC
1 046% 046%
18.0°C 18.4°C
24.0°C 38%rh
4.4°C
Feedback position
from Valve
Actual secondary
temperature
Room relative humidity
Calculated dew point
from room conditions
Room temperature
* System set point
Control valve currently
operational (1 or 2)
Demand signal to
Valve
OK
OK
OK
OK
1
st
line = Digital input status
2
nd
line = Digital output status
0 = digital status OFF
1 = digital status ON
digital i/o
000000000 1
0000000000
Screen title