General; Installation; Motor Cooling; Outdoor Installation - Grundfos CRE Installation And Operating Instructions Manual

2. General

Grundfos E-pumps are pumps fitted with frequency-controlled
standard motors for single-phase or three-phase mains
connection.
Pumps without factory-fitted sensor: The pumps have a built-
in PI controller and can be connected to an external sensor
enabling control of for instance pressure, differential pressure,
temperature, differential temperature or flow in the system in
which the pumps are installed.
The pumps have been set to uncontrolled operation, i.e. the
pump performance can be set according to the demand.
Pumps with pressure sensor: The pumps incorporate a PI
controller and a pressure sensor enabling control of the pump
discharge pressure.
The pumps can be set to controlled- or uncontrolled-operation
mode.
The pumps are typically used as pressure booster pumps in
systems with variable demands.
The desired setpoint can be set directly on the pump control
panel, via an input for external setpoint signal or by means of the
Grundfos wireless remote control R100.
All other settings are made by means of the R100.
Important parameters such as actual value of control parameter,
power consumption, etc. can be read via the R100.
The pump incorporates
• inputs for external potential-free contacts for start/stop and
digital function.
The digital function enables external setting of max. curve,
min. curve, external fault function or flow switch.
• an output for a potential-free fault, operating or ready signal.
• an input for bus communication.
Via the bus communication input, the pump can be controlled
and monitored by a building management system or another
external control system.

3. Installation

The pump must be secured to a solid foundation by bolts through
the holes in the flange or base plate.
Pumps 0.37-7.5 kW: In order to maintain the
UL/cUL approval, additional installation
Note
procedures must be followed, see page 27.

3.1 Motor cooling

To ensure sufficient cooling of motor and electronics, the
following must be observed:
• Place the pump in such a way that sufficient cooling is
ensured.
The temperature of the cooling air must not exceed 40 ° C.
•
• Cooling fins and fan blades must be kept clean.

3.2 Outdoor installation

When installed outdoors, the pump must be provided with a suit-
able cover to avoid condensation on the electronic components,
fig. 1 or 2.
4
Fig. 1 Examples of covers, 0.37-7.5 kW
Fig. 2 Examples of covers, 11-22 kW
For further installation, see installation and operating instructions
for the standard pump.
3.3 Electrical connection – single-phase pumps
The user or the installer is responsible for the
installation of the correct earthing and protection
according to valid national and local standards.
Caution
All operations must be carried out by a qualified
electrician.
Warning!
All electric supply circuits must be interrupted
before working in the pump terminal box.
Never make any connections in the pump
terminal box unless the electricity supply has
been switched off for at least 5 minutes.

3.3.1 Mains switch

The pump must be connected to an external all-pole mains switch
with a contact separation of at least 3 mm in each pole according
to IEC 364.
3.3.2 Protection against electric shock – indirect contact
The pump must be earthed and protected against
indirect contact in accordance with national
regulations.
Protective earth conductors must always have a yellow/green
(PE) or yellow/green/blue (PEN) colour marking.