WhisperGen PPS16 Installation and Commissioning Manual Rev: 080801
9
6.3 Plumbing the primary coolant circuit
See
Figure 2
: WhisperGen services layout,
Figure 3
: Primary coolant circuit – series; and
Figure 4
: Primary coolant circuit - parallel.
The WhisperGen primary inlet and outlet connections are ISO Rp
¾
BSP female threads.
They are on the back of the WhisperGen enclosure, marked “PRIMARY HEATING IN”
and ‘PRIMARY HEATING OUT”.
The primary circuit shall have a pressure relief system on top of the header tank, set at a
maximum of 1 bar.
The tubing for the primary coolant circuit shall:
●
have an inside diameter of between 19mm (¾”) and 30mm (1¾”);
●
be rated for continuous operation at 100°C at 1 bar.
●
be as short as possible, with a maximum length of 25 metres;
●
have as few bends as possible with no sharp bends or kinks; and
●
be clean and free of debris.
The primary coolant pump shall be mounted directly below the coolant tank.
For
series circuits
:
●
a self-bleeding header tank shall be installed at the highest point in the circuit. The
volume of the header tank shall be at least 5% of the total volume of coolant in the
circuit. This will allow for thermal expansion of the coolant. Allow approximately 2
litres for the WhisperGen.
●
the distance between the self-bleeding header tank and the primary coolant pump
shall be a maximum of 300mm; and
●
the minimum distance between the top of the WhisperGen and the outlet from the
self-bleeding header tank is 100mm.
For
parallel circuits
:
●
air bleed valves shall be installed at all high points;
●
the minimum distance between the top of the WhisperGen and the outlet from the
header tank is 100mm; and
●
the tubing which goes through the hot water cylinder shall have an inside diameter
of 22mm. The rest of the plumbing shall use tubing with an inside diameter of
15mm. It is important that the flow restriction of the tubing which goes through the
hot water cylinder is less than the other parallel heating devices.
