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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

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 ***

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