Pipe installation
Pipe installation must be carried out in accordance with
current norms and directives.
The drain valve is installed on the heating system’s return
line (XL9).
The system where UKV 20-500 is installed must be sup-
plied with a safety valve of max. 6 bar (0.6 MPa), and the
system where UKV 20-750 or UKV 20-1000 is installed
must be supplied with a safety valve of max. 3 bar (0.3
MPa). The overflow pipe must be the same size as the
safety valve. Route the overflow pipe from the safety
valve, sloping along its entire length, and ensure that it
is frost proof. The mouth of the overflow pipe must be
visible and not placed close to electrical components.
Filling
Fill the accumulator tank as follows:
1. Open the vent valve (QM25) at the top of the accu-
mulator tank.
2. Fill the vessel through the drain valve.
3. When only water comes out of the vent valve (ini-
tially an air-water mixture comes out of the valve),
the vent valve can be closed the accumulator tank
is filled.
Electrical installation
NOTE
Electrical installation and service must be car-
ried out under the supervision of a qualified
electrician, and in accordance with applicable
electrical safety regulations.
UKV 20-750 and UKV 20-1000 can be equipped with an
immersion heater and UKV 20-500 can be equipped with
up to two immersion heaters.
Each immersion heater is supplemented with junction
box type K11 (2-pole thermostat, 3-pole temperature
limiter). Do not modify or reconnect! A separate supply
from group central is routed to each immersion heater.
NOTE
The accumulator tank must be completely filled
with water before it can be connected on the
electrical side.
13
Chapter 3 |
For the Installer
NIBE UKV 20
