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D
(
OMESTIC HOT WATER
DHW
The domestic hot water (DHW) circuit also requires a minimum water content to guarantee correct operation and to
avoid excessive cycling of the compressors that can reduce the working life of the unit.
The minimum domestic hot water circuit content required is:
Model
Minimum water content (l)
Safety valve (bar)
The minimum water content of the domestic hot water circuit shown above in the table indicates
only the minimum water content required by the system to guarantee the correct operation of the
unit in terms of the correct number of start/stops of the compressors and minimum operating time
allowed for each cycle. The above value does not guarantee the availability of an adequate domestic
hot water flow to the user and its correct temperature over the long term; this value must be
calculated according to the DHW load of the site. Please contact Lochinvar for help sizing the DHW
load.
F
ILLING THE HYDRAULIC CIRCUIT
• Before filling, check that the system drain valve is closed.
• Open all pipework, heat pump and terminal unit air vents.
• Open the shut off valves.
• Begin filling, slowly opening the water valve in the filling group outside the unit.
• When water begins to leak out of the terminal unit air vents, close them and continue filling until the pressure gauge indicates a
pressure of 1.5 bar.
The installation should be filled to a pressure of between 1 and 2 bars. It is recommended that this operation be repeated
after the unit has been operating for a number of hours (due to the presence of air bubbles in the system). The pressure of the
installation should be checked regularly and if it drops below 1 bar, the water content should be topped-up. If frequent top-ups
are required, check all connections for leaks.
E
MPTYING THE INSTALLATION
• Before emptying, place the mains switch in the "Off" position.
• Make sure the filling group valve is closed.
• Open the drainage valve outside the unit and all the installation and terminal air vent valves.
If the fluid in the circuit contains anti-freeze, it MUST not be allowed to run away to drain. It must be collected for
possible re-cycling or for correct disposal.
29 |
P a g e
)
HYDRAULIC CIRCUIT
302
402
500
600
6
6
602
702
902
750
850
1200
6
6
6
1202
1402
1804
1500
1700
1200
6
6
6
2304
2604
1500
1700
6
6
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