6. Tank pre-charge pressure is too low or too high — when
the system drops to low flow demand, the BoosterpaQ
will stop at a pressure slightly higher than the set-
point. It will restart when the pressure drops again
below the set-point. If the system stops and starts
frequently the tank pre-pressure may be too low or too
high. Stop the system, close the valve to the tank, bleed
the tank, and check the pre-charge air pressure. It must
be 0.7 times the set-point of the system (0.9 times for
MS and MSH systems). If the system continues to stop
and start frequently, consider a larger size tank.
7. Suction and discharge piping reversed.
8. Pump, manifold, or system piping is plugged with
debris.
9. Pumps rotate clockwise (must be counter-clockwise
looking from the top). On 3 phase systems, switch any
2 of the 3 power mains wires supplied to the control
panel. Do NOT switch other wires until this has been
tried.
10. Voltage monitor is triggered. Check voltage (loss of
phase, large imbalance).
INDICATOR LIGHTS OUTPUTS PFU 2000 OUTPUTS PMU 2000
Fault (red) Operation (green) Fault Operation Fault Operation Description
Electricity supply switched off or
Off Off supply failure
.
At least one pump in each zone is
Off in operation.
All pumps in at least one zone have
been stopped:
• via external on/off switch or
• via function selector in
PFU 2000 (pos. STOP),
• via PFU 2000/PMU 2000.
At least one pump is stopped due
to fault.
At least one pump is or has been
stopped due to fault. At least one
pump in each zone is in operation.
All pumps in at least one zone have
been stopped:
• via external on/off switch or via
function selector in PFU 2000
Flashing
• via PFU 2000/PMU 2000. At least
one pump is or has been stopped
due to fault.
FlashingOff
Permanently
on
Permanently
on
Permanently
on
Permanently
on
Permanently
on
Of
f
11. PFU 2000 DIP Switch Settings are different than the
factory listed settings in this Installation and Operating
Manual — check them against the factory settings on
page 12 depending or whether your system has only a
PFU 2000 or a PMU 2000. Call your Grundfos distribu-
tor or the Grundfos factory if you believe you have
discovered incorrect settings.
Operating and fault indications
The two indicator lights (LED) on the front cover of PFU
2000/PMU 2000 indicate pump operation (green) and/or
fault (red). Two external indicator lights (LED) can be con-
nected instead of the two indicator lights (LED) on the
front cover (see page 38, Terminals 7 and 8). The function
of the indicator lights (LED) and the operating and fault
signal outputs are listed in the table below.
10
BpaQ IO INDD.indd 1/28/2005, 11:01 AM10
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