Grundfos iGRID P-Zone, Инструкция по установке и эксплуатации, Страница: 17 / 80

English (GB)
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Fig. 13 Access to iGRID P-Zone and T-Zone
It is possible to access iGRID P-Zone and T-Zone via the cover
and the fixed ladder with handles.
The cover and fall protection grid must be secured and locked in
open position before accessing the pit.
When leaving the pit, the cover must be closed and locked with a
padlock or special tool to prevent unwanted access.
Check the ladder with handles fixed in the pit and the attachment
points of the handles at least once a year for cracks, corrosion
and other irregularities. Do not stand on the pump or pumps,
pipes or any other equipment installed in the pit in connection
with accessing and leaving the pit.
5.1.1 Isolating valves
5.2 Replacing a pump
1. Disconnect the power supply.
2. Ensure that the pipe system connected to the pump is isolated
from the district heating pipe system and that the valves
cannot be unintentionally reconnected.
3. Depressurise the pipe system, and drain it slowly for district
heating water.
4. Drain the pump for water if possible.
5. Disconnect the connected cables to the pump power supply.
6. Dismantle wiring connections to sensors connected directly to
the pump, and retract them to the sensor.
7. Loosen and remove bolts and nuts in the flange.
8. Loosen and remove bolts and nuts in motor bracket.
5.3 Lifting a detached pump
Before lifting the pump, ensure that the pump has been detached
according to section
5.2 Replacing a pump .
1. Ensure that there is adequate space above the pit for the
lifting equipment to lift the pump completely free of the pit and
cover.
2. Lift the pump at the designated lifting points, see pump
installation and operating instructions.
3. Fit the straps approved for lifting, see fig. 13 .
4. Ensure that the pump has been emptied of water to the extent
possible before lifting it.
5. Ensure that the pump flanges do not touch other flanges.
6. Lift the pump from the pit.
5.4 Replacing a non-return valve, gasket, fixture tap or
flow sensor in the pipe system
1. Ensure that the pipe system with the non-return valve, gasket
or flow sensor to be replaced is isolated from the district
heating pipe system.
2. Ensure that the isolating valves cannot be unintentionally
opened.
3. Depressurise the pipe system and drain it slowly for district
heating water.
4. Dismantle the wiring connections to the flow sensor, and
retract them to the sensor.
5. Loosen and remove bolts and nuts in the flanges.
6. Remove the non-return valve, gasket, fixture tap or flow
sensor.
7. Install the new component by following the procedure in
reverse order.
8. When replacing the fixture tap, remember to wrap packing
yarn around the threads of the pipe system stub before
installing the new fixture tap.
TM0
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All work in the pit must be carried out according to
local regulations.
– When working in or near an open pit, always
place warning signs and safety guards around
the pit to ensure that persons and vehicles do
not fall into the pit. The warning signs must be
clearly marked and visible from all sides.
– The cover and locking device must be operated
by the same person.
– The cover and locking device must only be used
when no persons are in the pit.
Make sure to operate the isolating valves at least
once every 6 months to ensure they are functional.
90° 90°
1. 2.
3. 4.
WARNING
Crushing hazard
Death or serious personal injury
- Check that the lifting equipment can lift the load
before lifting the pump. See the weight on the
nameplate.