Unit installation

CDU Installation Guide Page 31
Cooling Distribution Unit
OPERATION (continued)
Screen
/ Level
Title
Options & (Info)
6-8-2
Flood op. u/f
Default Alarm [adj. alarm only / shutdown] (under floor sensor tape operation)
6-8-3
Threshold u/f
Default 143 [adj. 75 to 250] (u/f sensor sensitivity)
6-8-4
Flood delay u/f
Default 10 secs [adj. 5 to 60 secs] (u/f sensor alarm/shutdown delay)
6-9
Event relays
Default N/O [adj. normally closed, normally open] (relay operation mode)
Parameters (screen 6)
IM P E R I A L U N I T S
6-1
Reservoir
6-1-1
Fill pressure
Default 8 PSI [adj. 8 to 15 psi] (shut off threshold for fill pump)
6-1-2
Fill pump run
Default 3 mins [adj. 1 to 15 mins] (run time for float switch to make or fill
pressure to be achieved, prior to alarm)
6-1-3
Float switch delay
Default 4 secs [adj. 1 to 30 secs] (reservoir float switch de-bounce time)
6-2
Secondary pumps
6-2-1
No of RDHx
Default 1 [adj. 1 to 6]
6-2-2
DP setpoints
(pump differential
pressure set points for
pump speed control
loop)
6-2-2-1 Sys diff 1 RDHx – Default 30 PSI [adj. 8 to 60 psi]
6-2-2-2 Sys diff 2 RDHx – Default 33 PSI [adj. 8 to 60 psi]
6-2-2-3 Sys diff 3 RDHx – Default 36 PSI [adj. 8 to 60 psi]
6-2-2-4 Sys diff 4 RDHx – Default 39 PSI [adj. 8 to 60 psi]
6-2-2-5 Sys diff 5 RDHx – Default 42 PSI [adj. 8 to 60 psi]
6-2-2-6 Sys diff 6 RDHx – Default 45 PSI [adj. 8 to 60 psi]
6-2-3
DP loop refresh
Default 10 [adj. 5 to 120 secs] (scan period for pump speed control loop)
6-2-4
Pump DP hys
Default 8 PSI [adj. 2 to 45 psi] (threshold for pump low flow alarm)
6-2-5
Pump DP delay
Default 80 secs [adj. 1 to 300 secs] (time delay prior to pump low flow alarm)
6-2-6
DOL DP set point
Default 30 PSI [adj. 15 to 70 psi] (pump diff. press. set point when DOL)
6-2-7
PV c/o interval
Default 7 days [adj. 1 to 30 days] (pump/valve duty sharing period)
6-2-8
PV c/o time
Default 03:00 hrs [adj. 00:00 to 23:59 hrs] (time of day for pump/valve duty
sharing change over)
6-2-9
Pump c/o delay
Default 5 secs [adj. 1 to 10 secs] (dead time between pump change over)
6-2-10
Max ctrl.press
Default 60 PSI [adj. 15 to 115 psi] (max pump speed control loop pressure)
6-2-11
Min pump speed
Default 10 % [adj. 0 to 50 %] (set minimum pump speed)
6-2-12
Over pressure
6-2-12-1 Set point – Default 105 PSI [adj. 30 to 105 psi]
6-2-12-2 Action – Default Alarm [adj. alarm only / shutdown]
6-2-13
Inverter startup
6-2-13-1 Speed – Default 0 % [adj. 0 to 100 %]
6-2-13-2 Period – Default 0 secs [adj. 0 to 30 secs]
6-2-14
Fault attempts
Default 1 [adj. 0 to 5] (no. of inverter restarts before fault recognition)
6-3
Heat exchanger
6-3-1
Set point
Default 65 °F [adj. 50 to 75 °F] (water supply temperature to racks)
6-3-2
Valve runtime
Default 40 secs [adj. 10 to 180 secs] (valve motor run time for control loop)
6-3-3
Control mode
Default Fixed SP + Dew Point override [adj. Fixed SP, Fixed SP + DW
O/R, DW tracking]
6-3-4
Dew point offset
Default 4 °F [adj. 2 to 6 °F] (maintains set point threshold above dew point)
6-3-5
CV loop refresh
Default 5 secs [adj. 1 to 30 secs] (scan period for valve position control)
6-3-6
Demand/act error
Default 10 % [adj. 0 to 50 %] (difference between demand & actual valve
position prior to alarm / change over)
6-3-7
Valve check int
Default 15 min [adj. 1 to 120 mins] (scan period for valve position monitoring)
6-3-8
Loop settings
6-3-8-1 Prop band – Default 31°F [adj. 2 to 75 °F]
6-3-8-2 Integral reset – Default 400 secs [adj. 0 to 999 secs]
6-3-9
Sec low temp
Default 4 °F [adj. 2 to 18 °F] (temp. alarm threshold below set point)
6-3-10
Sec high temp
Default 4 °F [adj. 2 to 18 °F] (temp. alarm threshold above set point)
6-3-11
Sec temp hys
Default 2 °F [adj. 1 to 9 °C] (low/high alarm reset threshold)
6-3-12
Sec high temp
DW
Default 70 °F [adj. 60 to 75 °F] (high alarm threshold when dew point tracking)
6-4
Primary
6-4-1
Prim flow delay
Default 5 mins [adj. 1 to 30 mins] (time delay prior to alarm)
*** IMPERIA L UNITS ***