Windhager FireWIN - Heating Circuits; Domestic Water (Hot Water Tank); Return Temperature; Accumulator Tank

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2. For the Installer
Circulation pump (upplied as standard with FireWIN versions UAM and UAML):
The circulation pump shaft is lubricated by water, therefore the pump is never allowed to run without water.
Heating circuit pump:
High-efficiency circulation pump
Type: HEP 15–4.0 E
Installation dimension:130 mm
1
0,4
2
3
4
5
2,0
6
2,4
H
(m)
2,8 3,2 3,6 4,0
0
0
Q (m
HEP...-4.0-E
0,8 1,2 1,6
1m
2m
3m
4m
min
Diagramm 1 Pump characteristic curve HEP 15–4.0 E
1
1
2
3
4
5
5 6
H
(m)
0
0
HUP...-4.0 U
2 3 4
6
7
Q (m
3
/ h)
3
2
1
Diagramm 2 Pump characteristic curve HUP 15–4.0 U
Hot water loading pump:
Type: HUP 15–4.0 U
Installation dimension: 130 mm
2.2.3 Heating circuits
A motorised mixing valve is always required for the FireWIN in order to protect the boiler and one must be fitted
in each heating circuit. A feed contact thermostat (FK-001) must be installed for underfloor circuits. If required,
the hydraulic fittings can be integrated in the boiler for 1 mixed heating circuit (UAM or UAML version).
2.2.4 Domestic water (hot water tank)
If FireWIN is used for loading a hot water tank, a gravity brake must be installed in the heating return. This is
provided as standard with FireWIN UAML.
2.2.5 Return temperature
The return flow temperature increase installed as standard means that FireWIN can be operated with a return
temperature down to min. 20 °C. No external return flow temperature increase is required.
2.2.6 Accumulator tank
In principle a pellet boiler system does not need a buffer tank. A guaranteed minimum heat consumption is
required, e.g. fit a consumer circuit that cannot be blocked off or do not fit thermostat valves on all radiators.
Exceptions:
If the total heating requirements of the building according to the ÖNORM M 7500 or EN 12831 calculation are
less than 50 % of the boiler’s nominal output, we would recommend integrating a buffer tank in the system. This
means that the FireWIN loads the buffer tank with a return hold-up group. (Hydraulic system SYS 402, please
contact Windhager for planning advice)
Boiler installation criteria:
– controlled residential area ventilation is an advantage if the boiler is being installed in a small space or if buil-
ding heat loads are low
– heat shield (accessory: FIRE 023) needed
– the room temperature in the installation room is too high
– FireWIN operating times are set by the system control