Grundfos BoosterpaQ Hydro MPC, Инструкция по установке и эксплуатации

Страница: 56 / 58

56
13. Maintenance
13.1 Pumps
Pump bearings and shaft seal are maintenance-free.
13.2 Motor bearings
Motors without grease nipples are maintenance-free.
Motors with grease nipples should be lubricated with a high-
temperature lithium-based grease, see the instructions on the fan
cover of Grundfos motors.
In the case of seasonal operation (motor is idle for more than 6
months of the year), it is recommended to grease the motor when
the pump is taken out of operation.
13.3 CU 351
The CU 351 is maintenance-free. It must be kept clean and dry.
Furthermore, the CU 351 must not be outside the ambient
temperature range, see
16. Technical data .
14. Frost protection
Pumps which are not being used during periods of frost should be
drained to avoid damage.
Drain the pump by loosening the vent screw in the pump head
and by removing the drain plug from the base.
Do not tighten the vent screw and replace the drain plug until the
pump is to be used again.
15. Taking out of operation
Switch off the mains switch to take the booster set out of
operation.
Individual pumps are taken out of operation by switching off the
corresponding motor starter, automatic circuit breaker or fuse.
Follow a lock out tag out procedure.
16. Technical data
16.1 Pressure
Inlet pressure
Hydro MPC booster sets can operate with a positive inlet
pressure (precharged pressure system) or with a negative inlet
pressure (i.e vacuum at the inlet manifold).
Calculation of the inlet pressure is recommended when
• water is drawn through long pipes,
• water is drawn from depths,
• inlet conditions are poor.
To avoid cavitation, make sure that there is a minimum inlet
pressure on the suction side of the booster set. The
minimum inlet pressure in bar can be calculated as follows:
P
b
= Barometric pressure in feet (33.9 feet at sea level). In
closed systems, P
b
indicates system pressure in feet.
H
f
= Friction loss in suction piping in feet. (At the highest flow
the pump will be delivering).
H
v
= Vapor pressure in feet.
NPSH =
N
et
P
ositive
S
uction
H
ead in feet.
NPSH can be read from the NPSH curve at the
maximum capacity at which the pump will run.
(See installation and operating instructions for CR, CRI,
CRN).
HS = Safety margin = minimum 2 feet.
If "H" is calculated as positive, the pump can operate at a suction
of maximum "H" feet. If "H" is calculated as negative, an
inlet pressure (psia) if minimum "H" feet is required.
Maximum inlet pressure
Operating pressure
As standard the maximum operating pressure is 230 psi [16 bar].
On request, Grundfos offers Hydro MPC booster sets with a
maximum operating pressure higher than 230 psi [16 bar].
Warning
Before starting work on the pumps, make sure that
the electricity supply has been switched off.
Lock the mains switch with a padlock to ensure that
it cannot be accidentally switched on.
Warning
Care must be taken to ensure that the escaping
water does not cause injury to persons or
damage to the motor or other components. In hot
water installations, special attention should be
paid to the risk of injury caused by scalding hot
water.
Warning
The conductors in front of the mains switch are still
energized. Lock the mains switch with a padlock to
ensure that it cannot be accidentally switched on.
Note
In this installation and operating instruction the
term ‘inlet pressure’ is defined as the pressure/
vacuum which can be measured immediately
before the booster set.
Pump
Maximum inlet pressure
[bar / psi]
50 Hz
CR(E) 3-10 10 / 145
CR(E) 5-4 to CRI(E) 5-10 10 / 145
CR(E) 10-3 to CRI(E) 10-6 8 / 116
CR(E) 15-5 10 / 145
CR(E) 20-5 10 / 145
CR(E) 32-4 4 / 58
CR(E) 45-2 4 / 58
CR(E) 45-3 to CR(E) 45-4 10 / 145
CR(E) 64-4-2 10 / 145
CR(E) 90-3 15 / 218
60 Hz
CR(E) 5-7 10 / 145
CR(E) 10-3 8 / 116
CR(E) 15-3 10 / 145
CR(E) 20-3 10 / 145
CR(E) 32-2 4 / 58
CR(E) 45-2-1 10 / 145
CR(E) 64-2-1 10 / 145
CR(E) 90-2-1 15 / 218
Note
The maximum inlet pressure is determined by the
construction of the pump, such as bearing
pressure.
For information about other CR pump sizes, see
WebCAPS on www.grundfos.com.
H P
b
NPSH
–
H
f
–
H
v
–
H
s
–
=
www.motralec.com / service-commercial@motralec.com / 01.39.97.65.10