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– Secondary
A27
Over Pressure
or (depending on setup)
RM100 stops
– Secondary
A32
Over Pressure
– System
A31
Low Pressure
Water Make-Up
Make-Up Empty
Fig.18 – Fill Pressure & Level Flow Chart (when running)
CDU Operating & Maintenance Guide
Neptune DWC RM100 in-rack Coolant Distribution Unit
RM100 water pressure
management
System
Y
pressure (PS2)
>
d
N
Fill pressure
<
(PS1)
>10 secs?
Y
'Fill Pump Request'
& manual
fill pump start
Fill pressure
Y
<
(PS1)
a-c
>1 min?
N
Y
Fill pressure
(PS1) ≥
a+b
N
Fill pump stops
Has fill pump
run > 5 secs?
Y
– Check
A30
Has fill pump
run > 1 min?
Y
– Water
A15
Fill pump stops
RM100 continues
to run
Page
Unit running, with make-up
fill bag connected
= fill pump 'switch on' threshold
a
pressure (default 0.8 Bar (12psi))
= fill pump 'switch off' hysteresis
b
pressure (default 0.2 Bar (3psi))
c
= hysteresis pressure for low
?
pressure alarm (default 0.2 Bar
(3psi), non-adjustable)
d
= system over pressure threshold
(default 6 Bar (87psi))
N
a
for
for
?
N
N
24
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