9
MECHANICAL M1/1
11.2
Introduction of Water Treatment
PISCES
MINIFILL
The Mains Cold Water Supply pipework MUST be thoroughly cleaned and flushed to remove debris, flux residues, etc.
before opening the isolation valve and flooding the Pisces Minifill pressurisation manager.
After the Heating / Chilled Water system has been filled, flushed, and cleaned in accordance with BS 7593:1992, the
system will need to be treated with a suitable Water Treatment for the prevention of corrosion, scale formation and micro-
biological growth.
Some Water Treatments are supplied in a concentrated liquid form; following the successful commissioning of the
appliance as detailed below in Section 12, and in the absence of a suitable dosing pot, the Water Treatment Chemicals may
be added to the water in the Break Tank
in small doses
.
Drain an amount of water from the system (at a position some distance from the Pisces Minifill pressurisation manager), so
that the system pressure drops and the Treated Water in the Break Tank is introduced into the system.
As the Break Tank is replenished with fresh water, gradually add the water treatment chemical (at the correct concentration)
until the appliance turns off.
Repeat this process until the entire water treatment chemical has been fully introduced. Let the system circulate for a
minimum of 1 hour, and then undertake a water analysis to ensure the correct dosage level has been obtain. See Section
12.0 Commissioning.
12.1
Commissioning
The commissioning of a Pressurisation Manager shall only be undertaken by a competent person, as various safety
items associated with the safe operation of the heating / cooling / chilled water system need to be checked and
confirmed. We would therefore recommend that a Qualified Gas Safe registered engineer undertake these works.
The following Items 11.0 Filling the System, and 11.1 Set Up, needs to be completed.
12.2
First Fill and Setting to Work
Before attempting the Set Up procedure, please ensure that the following checks have been completed;
1)
Check the Heating / Chilled Water system expansion vessel air charge. This vessel charge should be equal to the
calculated Cold Fill Pressure (+/- 0.2 bar) when the vessel is empty of water. See Section 10.0.
2)
The Quarter Turn Isolation Valve on the underside of the Break Tank is in the CLOSED position.
3)
The Quarter Turn Isolation Valve on the Water Outlet (on the end of the flexible pipe) is in the CLOSED position.
4)
The Mains Water Supply has been connected, vented, and the appliance Break Tank has been filled with clean
water. Any foreign bodies/debris are to be removed before the appliance is set to work.
5)
The Electrical Supply has been connected and tested for correct polarity.
Power should not be applied to the appliance at this stage.
6)
The Heating / Chilled Water system has been fully flooded and vented as detailed in Section 11.1 above.
On completion of the above checks the unit is ready to be Set Up to the system requirements, and the following procedure
shall be followed.
To Prevent duplication of setting activities, it is advisable to undertake the testing/setting of the High and Low Pressure
Alarm Switches prior to setting the Cold Fill Pressure. To prevent potential over pressurizing or loss of water treatment,
the following test shall be undertaken with the outlet value of the appliance CLOSED.
