Installation manual

installation manual TWIN 80 EN
16
2.4. PUMP
2.4.1. Unit system pump
The TWIN 80C is equipped with 2x Wilo, type RS 15/7 internal circulation pumps. Depending of the cascade selection and heat
demand one pump may run intermittent or both pumps may run simultaneously.
Use with a low velocity header (open header) can also be selected. In this case a larger secondary sided water output has to be
taken into account, in order to affect the height of the water temperature.
Fig.: Characteristic and the resistance graph of the application when
both unit pumps run.
2.4.2. External system pump (option)
If the capacity of the unit pumps is insufficient, an extra external system pump can be installed with the appliance.
The maximum absorbed current consumption of the external circulation pump may be 275 W (1,2 Amp).
On command of the printed circuit board, an external second system-pump will switch with the internal boiler-pump simultaneously.
Note the internal pump will switch high/low/off (2-stage) while the external pump will switch on/off (1-stage).
External system pump
230VAC
max
275W (1 2
Amp
)
Terminal X5
printed circuit board
4 way Molex header 0 2
”
pitch
Neutral
Earth
Line
Neutra
l
Earth
Lin
e