Install Instructions

Examine the components carefully to make sure no
damage has occurred to the pump during shipment. Care
should be taken to ensure the pump is NOT dropped or
mishandled; dropping will damage the pump.
Shipment Inspection
Before beginning installation procedures, the following checks
should be made. They are all important for proper installation
of the circulator pump.
1. Uses: Model UPS15, and UP15, 25, 26, 43 and 50 series
pumps are generally designed to circulate water from 32
deg F to 230 deg F up to a maximum pressure of 150 psi.
Some models have temperature limitations which are
shown in Table 2A below. If required, a 50% by volume
solution of ethylene or propylene glycol and water can be
used, however, a decrease in pump performance may
result due to an increase in the viscosity of the solution.
Check with manufacturer for information regarding
suitability of pumping other fluids.
Closed Systems: Model UPS15, and UP15, 25, 26, 43 and
50 series pumps with cast iron pump housings are
designed to pump water compatible with their cast iron
construction. They are recommended for use in closed
hydronic systems. (i.e. airless, non-potable water).
Open Systems: Model UPS15, and UP15, 25, 26, 43 and 50
series pumps with stainless steel or bronze pump
housings are designed to pump water compatible with
their construction and can be used in both open and closed
systems.
2. Maximum Water Temperature: The maximum
allowable water temperature is determined by the ambient
or surrounding air temperature as shown in Table 2A.
Table 2A – Maximum Water Temperature
Pre-Installation Checklist
3. Inlet Pressure Requirements
The amount of pressure required at the inlet of the pump is a function
of the temperature of the water as shown in Table 2B.
Table 2B – Inlet Pressure Requirements
Water (°F) 190 165 140
Required Inlet Pressure (ft.) 5 4.5 3
(psi) 2.2 1.9 1.3
In a pressurized system, the required inlet pressure is the
minimum 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.).
Installation
Position of terminal box: 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. See Figure 3A.
If the terminal box position needs to be changed, it is best
to do so before installation. However, if the pump is
already installed, ensure that the electrical supply is
turned off and close the isolation valves before removing
the Allen screws.
To change terminal box position:
1. Remove the four (4) Allen screws (4 or 5mm wrench)
while supporting the stator (motor).
2. Carefully separate the stator from the pump chamber
and rotate it to the correct terminal box orientation.
3. Replace the Allen screws and tighten diagonally and
evenly (7 ft.-lb. torque).
4. Check that the impeller turns freely. If the impeller
does not turn easily, repeat the disassembly/
reassembly process.
Pump Mounting: For Indoor Use
Arrows on the side or bottom of the pump chamber indicate
direction of flow through the pump. GRUNDFOS circulators
can be installed in both vertical and horizontal lines. The pump
must be installed with the motor shaft positioned horizontally.
Under no circumstances should the pump be installed with the
shaft vertical or where the shaft falls below the horizontal plane.
See Figure 3B.
It is recommend that isolation valves be installed on each side
of the pump. If possible, do not install elbows, branch tees,
and similar fittings just before or after the pump. Provide
support to the pump or adjacent plumbing to reduce thermal
and mechanical stress on the pump.
Installation Requirements
1. Thoroughly clean and flush the system prior to pump
installation.
2. Do not install the pump at the lowest point of the
system where dirt and sediment naturally collect.
3. Install an air vent at the high point(s) of the system to
remove accumulated air.
4. Ensure that water does not enter the terminal box
during the installation process.
5. (Open System) Install the pump in the supply line; the
suction side of the pump should be flooded with water.
Ensure that the static head requirement from Table
2B is achieved.
6. (Closed System) Install a safety relief valve to protect
against temperature and pressure build-up.
7. If there are excessive suspended particles in the water,
it is recommended that a strainer and/or filter be
installed and cleaned regularly.
8. DO NOT START THE PUMP UNTIL THE SYSTEM HAS BEEN
FILLED.
CHECK VALVE REMOVAL:
1. Use needle nose pliers to remove check valve from
pump housing. 2. Check to make sure no part of the
valve remains in the pump housing. 3. Apply enclosed
round "Check Valve Removed" label over the Check
mark symbol located on the name plate of the pump.
Electrical
Figure 3A
Recommended Terminal Box Orientation
All electrical work should be performed by a qualified
electrician in accordance with the latest edition of the
National Electrical Code, local codes and regulations.
Warning: The safe operation of this pump requires that
it be grounded in accordance with the National Electrical
Code and local governing codes or regulations. The
ground wires should be copper conductor of at least the
size of the circuit conductor supplying power to the pump.
Minimum ground wire size is 14 AWG. Connect the
ground wire to the grounding point in the terminal box
and then to an acceptable ground. Do not ground to a gas
supply line.
The proper operating voltage and other electrical
information can be found on the nameplate attached to
the top of the motor. Depending on pump model, the
motor has either built-in, automatic resetting thermal
protection or is impedance protected and in either case
does not require additional external protection. The
temperature of the windings will never exceed allowable
limits, even if the rotor is locked.
Wire sizes should be based on the ampacity (current
carrying properties of a conductor) as required by the
latest edition of the National Electrical Code or local
regulations. Both the power and grounding wires must
be suitable for at least 194°F (90°C).
For all 115V and 230V models: Connect the white/white electrical leads
from the circulator to the incoming power leads with wire nuts or other
approved connectors. Attach incoming grounding wire to either of the
green grounding screws.
Figure 3B
Acceptable
Unacceptable
1
2 3
4
Ambient (°F) 104 120 140 160 175
Water All UP* (°F) 230 220 210 190 175
UP15-100F (°F) 205 195 185 175 -
UP26-120U (°F) 205 195 185 175 -
UP26-116 (°F) 150 140 - - -
*Exceptions below:
Maintenance-Free Circulators
Maintenance-Free Circulators
Maintenance-Free Circulators
Maintenance-Free Circulators
Wiring diagram for 115V and 230V multi-speed pumps.
Capacitor
Green Ground
Neutral
Line
Jumper Wire
Line
Neutral
Green Ground