MHS Boilers Ultramax 115, Руководство по эксплуатации и техническому обслуживанию, Страница: 32 / 46

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Installations with weather dependent regulation and hot water priority switching
The small water capacity of the boiler and the fast, accurate boiler temperature regulation makes
the Ultramax unit ideal for use as a boiler with hot water priority switching.
The boiler uses a simple temperature regulator without room-temperature compensation. In order
to determine the supply water temperature and to compare this with the set heating curve using
an external temperature sensor, it is necessary to keep the boiler pump operating continuously.
Switching the secondary pumps on and off without the use of a building optimising system results
in the temperature swings being too large and a boiler and pump that are switched too frequently.
This increases the chances of wear and faults occurring. In addition, it is likely that the operating
efficiency will be reduced.
Generally the hot water storage capacity is determined by peak usage and operating cycle. In
order to avoid shuttling between central heating and hot water regulation and to keep the boiler
operating at high capacity, we advise the following:
- Minimum hot water storage capacity: 300 l/100 kW
- Maximum storage tank heating time: 20 minutes.
Installations with multiple appliances
For installations in which each appliance is fitted with a pump, the pump is switched off after the
boiler has been shut down.