Drazice OKH 125 NTR Manual de funcionamiento e instalación - Página 9

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Drazice OKH 125 NTR Manual de funcionamiento e instalación
It is necessary to check the safety valve each time before putting it into operation. It is
checked by manual moving of the membrane from the seat, turning the make-and-break
device button always in the direction of the arrow. After being turned, the button must click
back into a notch. Proper function of the make-and-break device results in water draining
through the safety valve outlet pipe. In common operation, such a check needs to be
implemented at least once a month, and after each storage tank shutdown for more than 5
days. Water can drip from the safety valve through the drain pipe; the pipe must be freely
open to the atmosphere, placed vertically and shall be in an environment free of
temperatures below freezing. When draining the storage tank, use a drain valve. You must
first close the water supply to the storage tank. Required pressures are in Table 2 below. To
ensure correct operation the safety valve must be mounted on the inlet piping return valve,
preventing spontaneous storage tank draining and hot water penetrating back into the
water main.
Required pressures - Table 2 - We recommend that the hot water distribution from the storage tank was as
short as possible to minimize heat losses.
SAFETY VALVE STARTING
PRESSURE (MPa)
Table 2
Connection of the storage tank exchanger (left, right) and fittings at the cold water inlet.
Figure 5
ADMISSIBLE OPERATING OVER-
PRESSURE OF STORAGE TANK
0,6
0,7
1
O - Air outlet valve
U - Shut-off valve
P1 - Safety valve with backflow flap
P2 - Safety valve for heating circuit
M - Manometer
Z - Test valve
V - Drain valve
Connection on the cold water inlet must conform to
national standard.
MAXIMUM PRESSURE IN
COLD WATER PIPES
(MPa)
0,6
0,7
1
(MPa)
do 0,48
do 0,56
do 0,8
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