VersaFlo CSI specifications - DOC

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Magna Wet Rotor Circulator
Part I – GENERAL

1.1 WORK INCLUDED

A. Contractor shall furnish and install Grundfos Magna sensor-less variable speed wet rotor in–
line circulator pumps in accordance with manufacturer’s recommendations and plans.

1.2 REFERENCE STANDARDS

The work in this section is subject to the requirements of applicable portions of the following
standards:
A. Hydraulic Institute
B. ANSI – American National Standards Institute
C. ASTM – American Society for Testing and Materials
D. IEEE – Institute of Electrical and Electronics Engineers
E. NEMA – National Electrical Manufacturers Association
F. NEC – National Electrical Code
G. ISO – International Standards Organization
H. UL – Underwriters Laboratories, Inc.
I. CSA –Canadian Standards Association

1.3 INSTALLATION REFERENCES

The wet runner pump manufacturer shall have minimum 10 years of experience in the country of
the installation. The contractor shall provide minimum 5 installation references of similar size in
the state/province pump is going to be installed.

Part 2 – PRODUCTS

2.1 WET ROTOR CIRCULATOR PUMPS

A. Furnish and install variable speed 1x60x230V as per plans and pump schedule.
B. The pump shall be a standard product of a single pump manufacturer. The pump and motor shall
be designed and built by the same manufacturer.
C. The wet rotor circulator pump shall be certified and listed by UL (1Z28 Water circulating pump)
and/or CSA (Water Circulating Pump) and/or ETL Water Circulating Pump) for conformance to
U.S. and Canadian Standards to operate at maximum 230 F and minimum 35 F water.

D. The sound pressure level of the pump shall be lower than 38dB(A)
E. The pumps shall be capable of operating continuously at 203 F.

Magna Wet Rotor Circulator Specification, Page 1 of 4
2.1.1 PUMPS

A. The pumps shall be of the quiet wet rotor in-line design.
B. The head-capacity curve shall have a steady rise in head from maximum to minimum flow within
the preferred operating region.
C. The pumps shall have the following features:
1. The pump housing shall be of the in-line type and have a stainless steel neck ring to
minimize recirculation and increase pump efficiency.
2. The impellers shall be of the radial type with curved blades. The impeller shall be secured
to the shaft by a split cone and nut.
3. The suction and discharge flanges shall be tapped and drilled to allow gauge installation on
the pump.
4. Pump Construction.
a. Pump housing: Cast iron EN-JL-1040 (35B-40B) or
Stainless Steel 1.4408 (CF8M)
b. Impellers: 304 Stainless Steel or
Composite PES 30% GF
c. Rotor can: 304 Stainless Steel
d. Rotor cladding: 316 Stainless Steel
e. Shaft: 303 Stainless Steel
f. Thrust Bearing: Tungsten Carbide
g. Axial thrust bearing: Carbon MY106
h. Journal: Tungsten Carbide
i. O-rings: EPDM
j. Bearing plate: 304 Stainless Steel

2.1.2 INTEGRATED VARIABLE FREQUENCY DRIVE MOTORS
A. Each motor shall be 4- or 8-pole, synchronous, permanent-magnet (PM motor) and tested with
the pump as one unit by the same manufacturer. Conventional asynchronous squirrel-cage
motors shall not be acceptable.
B. Each motor shall be of the Integrated Variable Frequency Drive design consisting of a motor and
a Variable Frequency Drive (VFD) built and tested as one unit by the same manufacturer.
C. The stator housing shall be made of pressure die cast aluminum. The stator housing shall have 3
drain holes to enable condensed water to escape.
D. The motor shall be cooled by the pumped fluid.
E. Motor shall be self ventilating. The stator housing shall have nickel plated brass inspection screw.
F. Minimum insulation class for the motors shall be Class F.
G. The integrated VFD control shall utilize an energy optimization algorithm to minimize energy

Magna Wet Rotor Circulator Specification, Page 2 of 4
consumption by reducing the factory-set setpoint and adjust to actual system characteristics.
This shall be accomplished without the need of any external sensors or input.

2.1.3 Operating Modes

A. The pump shall be have the following control modes:
1. AutoADAPT – During operation, the pump automatically reduces the factory-set setpoint and
adjusts it to the actual system characteristic. Manual setting of the setpoint is not possible.
2. Proportional Pressure – The head delivered shall be reduced from a manual setpoint linearly in
accordance with decrease in flow demand in the system
3. Constant Pressure – A manual set constant head is maintained, irrespective of flow
4. Constant Curve – The pumps runs as an uncontrolled pump according to a pump curve set. The
pump shall have between 5 and 10 curves in addition to maximum and minimum capable of being
selected from the control panel. Additionally, the pump shall have between 41 and 91 curves in
addition to maximum and minimum capable of being selected from a wireless remote control.
5. Automatic Night-Time duty – The pump shall change automatically between normal duty and
night-time duty. Changeover between normal and night-time duty shall take place as a result of
flow-pipe temperature measured by an internal integrated temperature sensor. The changeover
shall take place when the temperature sensor registers a flow-pipe drop of more than 10-15
Degress Celsius within approximately 2 hours. The required temperature drop shall be a
minimum of 0.1 degress Celsius per minute.
6. Temperature Influence – The pump shall be capable of temperature influence set to a maximum
temperature of either 50 degrees Celsius or 80 degrees Celsius. A drop in flow-pipe temperature
will cause a linear reduction of setpoint.

2.1.4 TERMINAL BOX

A. The terminal box shall be made of black composite material. Enclosure class shall be IP44.
Aluminum terminal boxes shall not be acceptable.
B. The terminal box shall be able to connect directly to the mains with out the need of an external
contactor.
C. The terminal box shall be suitable to accept add-on modules.
Choose one of the below…
Two pumps in parallel, duty/standby application;
D. Each pump shall be supplied with a Genibus module for duty standby pump application (2 pumps
only). The module shall be capable of rotating the pumps every 24 hours. The module shall
accept an external reference setpoint via an analog 0-10V signal.
To obtain communication with LonWorks® building management systems the pumps shall be
supplied with

Magna Wet Rotor Circulator Specification, Page 3 of 4
E. Each pump shall be supplied with a LON module compatible with LonTalk® protocol, FTT10, to
provide data transmission between a LON network and the Magna pump.
F. The circulator shall be supplied with an integrated VFD and shall not be used with any external
VFDs.

2.2 INSTALLATION

G. The pump shaft shall be installed horizontally per manufacturer’s recommendations. The terminal
box shall be located as per manufacturer’s recommendations. The system shall be vented out
from a higher location form the pump. The required inlet pressure by the pump shall be available
at the pump inlet.

2.3 TESTING

A. The pumps shall be factory performance and hydrostatic tested as a complete unit prior to
shipment. The testing shall be done in accordance with ISO 9906 Annex A. No test certificate is
required.

2.4 WARRANTY

A. The warranty period shall be a non-prorated period of 24 months from date of installation, not to
exceed 30 months from date of manufacture. Warranty shall cover pump, motor and add-on
modules as complete unit.

Magna Wet Rotor Circulator Specification, Page 4 of 4