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S
OURCE WATER PUMP INSTALLATION
Recently there has been a continuous increase in installations (solution 1 at page 32) where the variable speed source water pump
(inverter type) is used.
The Lochinvar Limited states that it is of fundamental importance the correct flow rate of water source in order to avoid
problems of freezing of the source heat exchanger. In this regard it is noted that the source water pump should be exclusively
dedicated to the heat pump and, must be working as an on/off type control.
In the case of using the source water pump for other purposes (irrigation, etc.) and you need a variable speed pump
(inverter type) , undertakes the installation of the modulating valve V2MO. In these cases, the pump must ensure a
constant pressure at the inlet of the source circuit of the heat pump of at least 3 bars, regardless of the type and
number of active users.
In case of variation of the water flow to the source circuit there is a risk of freezing of the source heat exchanger. In this
case the warranty expires immediately.
The activation of the modulating valve V2MO shows a selector used to vary the type of signal and the sense of rotation of
the valve itself. Tampering can undermine the correct operation of the valve precluding security.
H
YDRAULIC CONNECTIONS
The water pipe-work must be installed in accordance with national and local regulation and can be made from copper, steel, galvanized
steel or PVC. The Pipework must be designed to cater for the nominal water flow and the hydraulic pressure drops of the system, a maximum
pressure drop of 300 Pa/m run being typical. All pipes must be insulated with closed-cell material of adequate thickness. The hydraulic piping
should include:
Pockets for temperature sensor to measure the temperature in the system.
Flexible joints, to isolate the unit from the rest of the system
Temperature and pressure gauges for maintenance and servicing operations.
Shut-off manual valves to isolate the unit from the hydraulic circuit.
Metallic filters to be mounted on the inlet pipe with a mesh not larger than 1 mm.
Vent valves, expansion tank with water filling, discharge valve.
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