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ST-37 – Instruction Manual
activation threshold (see page 9, point II i).
The temperature is adjusted with PLUS and MINUS. After several seconds,
the display will return to its previous state. After reaching the water heater
setpoint temperature, the hot consumption water pump is shut off, causing
the central heating pump to be activated.
In this mode, the fan and the feeder are limited to 62°C to prevent the boiler
from overheating. Such condition will be kept until the water heater setpoint
temperature is reached. When the temperature is reached, the hot
consumption water pump is shut off and the central heating pump is
activated.
The central heating pump will run until the water heater temperature drops
below the setpoint value; then, the central heating pump is shut off and the
hot consumption water pump is activated.
The hot consumption water priority function consists in that the consumption
water is heated up before heating up water in radiators.
ATTENTION:
The boiler should have non-return valves mounted on central
heating and hot consumption water circuits. The valve mounted on the pump
will prevent the hot consumption water from being discharged from the water
heater. The valve mounted on the central heating circuit will not let the hot
consumption water move from the water heater into the house circuit.
II.m.3) Parallel Pumps
In this mode, the pumps run initially in parallel above the set temperature
(see the pump switch-on temperature function). The central heating pump
- 12 -
Water Heater Priority
Parallel Pumps *
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