RDZ UM 06, Инструкция по установке и техническому обслуживанию

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UM / UM PLUS
Chillers and inverter air / water heat pumps with axial fans
12
7.4.3 Plant drainage system
When it is necessary to drain the plant, close at first the inlet and outlet manual gate valves (not supplied) and then remove the
pipes that are disposed externally on the water inlet and on the water outlet in order to spill away the liquid contained in the unit
(for easier operation, it is recommended to install externally two draining valves, on the water inlet and on the water outlet,
between the unit and the manual gate valves).
7.4.4 Hydraulic circuit
Models: UM / UM Plus
A
B
H
F
G
E
D
C
KEY
A Plate heat exchanger F Air vent valve
B Water flow switch G Safety valve
C Service valve H Pressure gauge
D Pump with DC brushless motor
E Expansion vessel
During the operations of charging/topping up, the plugs of the air vent valves must
be partially unscrewed to allow air to flow freely out of the valves.
(1) Plug of the air vent valve
You can use the service valve, when it is necessary to refill the plant or adapt the
concentration of glycol. Unscrew the cap of the service valve and connect to the
hose a pipe of 14 mm (inner diameter) connected to the water network, and then
load the system by unscrewing the knurled nut. When the operation is concluded,
retighten the knurled nut and screw on the cap. In any case, we recommend you to
use for the water loading of the plant an external tap whose arrangement is by the
installer.
Cap with gasket
Knurled nut
1