Installation; Location; Foundation; Pipework - Grundfos Hydro Dome CHV 2-50 Installation And Operating Instructions Manual

5. Installation

5.1 Location

The booster set should be placed in a well-ventilated room to
ensure adequate cooling of the pump motors. It should be placed
with a 0.5 metre clearance in front and on the two sides.
The tanks can be placed on the discharge manifold or on the
floor/wall anywhere around the booster set.

5.2 Foundation

The booster set does not require a special foundation, but it
should be positioned on a plane and solid surface, e.g. a concrete
floor.

5.3 Pipework

The pipes connected to the booster set must be of adequate size
(2"). To avoid resonance, expansion joints should be fitted in the
suction and discharge pipes/manifolds. See fig. 3. Either end of
the manifolds can be used for pipe connections.
In the case of suction lift installation, the suction manifold must be
removed and each pump must be fitted with its own suction pipe
and non-return valve.
The booster set is not designed to support more
than one 24-litre tank mounted on the discharge
manifold. One more 24-litre tank on the discharge
Caution
manifold is optional. If two tanks are mounted on
the manifold, additional supports/pipe hangers
are required.
Additional tanks have to be placed on the floor/wall anywhere
around the booster set. The pipes must be fastened to parts of
the building to ensure that they cannot move or be twisted.
See fig. 3.
The booster set should be tightened up before start-up.
2
Fig. 3
1. Expansion joint.
2. Pipe hanger.
The tanks, expansion joints and pipe hangers shown in fig. 3 are
not included in the standard booster set.

5.4 Dry-running protection

Accessory: It is possible to install a pressure switch (normally
open (NO)) on the suction side of the booster set to monitor the
inlet pressure and to prevent the booster set from running dry
(a level switch can be used if the suction side is connected to an
open tank).
8
1
2
2
1
2
When the inlet pressure/level drops below the set value (0.4 bar),
the pumps are cut out and the alarm is activated. When the
correct pressure/level is restored (1.2 bar), the pumps are cut in
automatically. In the case of three-phase versions, the alarm
must be reset manually.

5.5 Overpressure protection

Accessory for three-phase versions only: An additional
pressure switch can be installed on the discharge side of the
booster set to protect the discharge pipes and components
against overpressure. This pressure switch can be set to the
maximum operating pressure or lower according to system
condition.
When the maximum pressure is reached, the pumps will be cut
out and the alarm is activated. When the correct pressure is
restored, the pumps are cut in automatically. The alarm must be
reset manually.

5.6 Tank selection

To ensure reliable operation, the booster set must be connected
to a diaphragm tank (or bladder tank). The tank volume can be
optimised according to the pumping condition. Furthermore, the
volume can be distributed on several tanks, e.g. two 24-litre tanks
on the discharge manifold and a customised tank on the floor.
The optimised tank volume can be calculated from the following
formula:
⋅ ⋅
Q 1000
V = --------------------------------------------------------------------------- -x
4n
V = Tank volume [litres].
Q = Mean flow for one pump [m
Δp =
Difference between cut-in and cut-out pressures.
Cut-in = Cut-in pressure [bar].
n = Maximum number of starts/stops per hour:
max.
n = 100.
max.
k = Constant for diaphragm tank (or bladder tank)
precharge pressure: k = 0.9.

5.7 Priming

Do not start the pumps until they have been filled with liquid.
See installation and operating instructions for CHV pumps.
Start-up is carried out according to section 7.

5.8 Electrical connection

The electrical connection should be carried out by an authorised
electrician in accordance with local regulations.
Warning
Before making any connections in pumps,
terminal boxes or control cabinet, the power
supply must be switched off.
The wiring diagram and motor labels show required values for the
electricity supply.
Single-phase versions:
In single-phase versions, a built-in thermal switch protects the
motor. If required according to local regulations, an additional
motor protection must be installed.
The mains supply cable with the leads L1, N and PE must be
connected to the CS 201 controller:
• L1 and N to main switch terminals and
• PE to terminal .
Three-phase versions:
No additional motor protection is required as the CS 203b
controller incorporates an automatic circuit breaker.
The mains supply cable with the leads L1, L2, L3 and PE must be
connected to the CS 203b controller:
• L1, L2 and L3 to main switch terminals and
• PE to the terminal located at the earth bar/plate.
( ( ) Δp )
1 + cut-in + 1
-- -
⋅ Δp
k
max
3
/h].