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*
TP series circulator is recommended for hard water areas in lieu of UPS series circulator
* Manifold header sizes are minimum requirements for water heater performance
Minimum Pump Inlet Pressure
Circulating pumps require a minimum inlet pressure in order to operate without cavitation. Refer to the
table below for minimum pressure requirements for Grundfos UPS series pumps. Minimum pressure
requirements for TP series pumps depend on system characteristics and need to be calculated.
Contact your pump supplier for more information.
Pump
UPS32-80B
350,430,507,520,670,770,870
UPS40-60/2B
768,868,972,992,1142,1182,1242,1292
1362,1412,1492,1552,1662,1722,1852,
UPS50-120B
1922,2004,2214
2404,2634,2804,3164,3304,3694,3804,
UPS80-120B
4224
COLD WATER SUPPLY / MAKE-UP
All pipe work must be cleared of foreign matter before connection and purged before attempting to
operate the water heater. All olive compression fittings must use brass or copper olives. Use thread
sealing tape or approved thread sealant on all fittings.
Mechanical, Hydronic and Process Heating Applications
The pressure of the make up supply must be controlled. This may be achieved by the use of a
pressure limiting valve or a header tank which is designed to provide the correct operating pressure for
the system.
Where the water heater is fitted with a 60PSI relief valve, the maximum pressure setting must not
exceed 330kPa. The minimum inlet pressure is dependant on a number of factors including operating
temperature, minimum inlet pressure for circulating pumps and system pressure losses.
Backflow prevention in accordance with AS/NZS 3500.1 may be required, please check with the local
water supply authority for any local code requirements.
A suitably sized expansion vessel must be fitted to a closed heating system to prevent discharge of
system fluid during the heating cycle.
Domestic Hot Water Applications
An isolation valve and non-return valve must be installed on
the cold water line to the system. An acceptable arrangement
is shown in the diagram opposite.
The cold water supply to a domestic water heating system
must be fitted with a pressure limiting valve if the water supply
pressure exceeds 80% of the lowest rated relief valve in the
system.
INSTALLLATION
Models
14
Minimum Inlet Head Required at
Operating Temperature (m)
°
°
°
75
C
80
C
85
C
0.5
0.5
0.5
1.5
2.5
3.5
4.0
5.0
6.0
16.0
17.0
18.0
°
°
90
C
95
C
3.0
5.0
4.5
7.0
7.0
9.0
19.0
20.5
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