sy24inst2 - The Initiative Group

Rendamax
Hydraulic short-circuit
In order to avoid a short circuit over a non-operating appliance, we advise the use of non-return
valves. These may be either mechanically or electrically operated valves.
When two appliances are switched in cascade, it is advisable to employ this system. When appliances
are controlled by a buil-ding optimising system using weather compensation or a compensating
unit, the common flow temperature sensor must be mounted at the common flow pipe as
indicated in the drawing.
Fig. 15
Installation with more than one appliance
6 Operating instructions
6 .1 Function
When a heating demand is received and before the boiler starts up, the appliance must be prepurged.
The fan supplies combustion air and has a modulating control. A zero controller in the gas valve
determines the required quantity of gas. Gas and air are optimally mixed. Thereafter, the gas air
mixture is ignited on the main burner. The fan also ensures that the resulting flue gasses are subsequently
removed. The removal system for these gasses performs an essential function for the
proper operation of the appliance.
The unit has no limits for return water temperature. If this temperature is low, condensation will
be formed which will then be removed via the drainage system.
6 .2 Regulation
Depending on the heating demand, the unit will be started up and shut down between 0% and
20% capacity and will be continuously modulated between 20% and 100% capacity.
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