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Construction
The UP pumps are of the canned rotor type, i.e. pump and
motor form an integral unit without shaft seal and with only two gaskets
for sealing. The bearings are lubricated by the pumped liquid.
The pumps are characterized by:
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Ceramic shaft and radial bearings.
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Carbon thrust bearing.
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Stainless steel rotor can and bearing plate.
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Impeller in corrosion-resistant material.
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Pump housing in cast iron.
Installation
The pump must always be installed with horizontal motor
shaft.
Proper installation of the pump will have the terminal box
located to one side of the pump or the other, with the conduit entry down.
UP can be installed in both vertical and horizontal lines.
UP pumps are intended for indoor use only.
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Motor
UP pumps
The motor is a 2 pole asynchronous squirrel-cage PSC
(permanent split capacitor) motor with UL, CUL, and CSA approvals.
UP pumps are available in Single-phase 115V & 230V
versions with one, or three speeds. The terminal box is easily accessible
and has functional cable connecting leads or terminals. Insulation class:
F.
The motor incorporates thermal overload or impedance
protection. Therefore, no external motor protection is required.
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UPS model pumps are multi speed and the speed can be
changed by a speed selector switch located on the front of the terminal
box.
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UP models are single speed.
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UP models with VS or MR suffixes are variable speed with
integrated control.
Motor Horse powers range from 1/25 thru 1/6 and power
consumption from 25 to 385 watts.
Pumped liquids
Depending on type, Grundfos circulator pumps are designed
for the following liquids:
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Potable Water
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Non-Potable Water
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Water/Glycol Mixtures.
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Chilled water.
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Domestic Hot Water
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Softened Water
If the circulator pump is used for a glycol mixture with a
higher viscosity than water, the hydraulic performance of the pump will be
reduced.
Example: 50% glycol at 68°F (20°C) means a viscosity of
approx. 10 cSt and a reduction of pump performance by approx. 15%.
When selecting a pump, the viscosity of the pumped liquid
must be taken into consideration. |
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Ambient and liquid temperatures
The maximum allowable water temperature is determined by
the ambient or surrounding air temperature as shown in Table 2A.
The above table refers to all standard product without
timer/control options and or other special features.
The ambient temperature for standard pumps with a
permissible liquid temperature from +2°C to +110°C should always be lower
than the liquid temperature, as otherwise condensation may form in the
stator housing.
Temperature requirements for pumps with timer/control and
or other special features may be found on their technical data page.
For all Domestic Hot water systems it is recommended to
keep the operating temp. as low as possible (e.g. 140°F (60°C) to avoid
calcium precipitation. |
Miximizer - Mixing Reset pump
The Grundfos MixiMizer, a fully integrated injection pump
and indoor/outdoor controller, is the only pump and controller system of
its kind. Equipped with a weather responsive control, also known as
indoor/outdoor control or reset control, the MixiMizer automatically
calculates and controls mixed water temperatures according to outdoor
temperatures in primary/secondary piping systems.
The control also provides pump exercising for 10 seconds
every 3 days and a 20 second post purge when the heat demand is removed.
For maximum design flexibility, the MixiMizer can be
integrated into a thermostat or zoning control system through the user
selectable ‘external call for heat/demand input’.
A fully serviceable check valve integrated into the pump
housing eliminates ghost flows in primary/secondary injection systems and
zone applications.
LEDs located on the terminal box are designed to indicate
performance and diagnose faults without tools.
Other standard user selectable features include boiler
protection, system/slab ‘over temperature’ control and a 5 degree F
parallel shift of the heating curve. |
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Maximum system pressure
ALL UP PUMPS: 145 PSI (10bar)
Inlet pressure requirements
The amount of pressure required at the inlet of a pump is
a function of the temperature of the water as shown in Table 2B:
Performance
In a pressure system, the required inlet pressure is the
allowable system pressure. In a system open to the atmosphere, the
required inlet pressure is the minimum distance the pump must be located
below the lowest possible water level of the water source (tank, pool,
etc.). |
Variable Speed pump
The Grundfos Variable Speed pump is another product with
fully integrated control. The variable speed controller requires a control
signal from a 0- 10/2-10 DC voltage sources or 0-20/4-20 mA current
sources and is user selectable.
If desired the manual-% dial allows the speed of the pump
to be manually adjusted and set by the user.
The speed of the pump may be manually adjusted anywhere
from min to 100%, but once set remains fixed at that speed.
In addition pump speed may be set as 0-100% or 15-100% by
user.
The control also provides pump exercising for 10 seconds
every 3 days and a power up reset, which runs the pump for 3 seconds at
full speed, for all modes of operation.
Terminal box mounted LEDs provide operation (power is
applied) and performance (flashes slower or faster) indication.
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