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PLUMBING FIXTURE
Connecting tanks to plumbing fixtures is shown in (Figure 12, Figure 13, Figure 14, Figure 15,
Figure 16, Figure 17). For potential disconnection of the tank, utility water inlets and outlets
must be provided with Js 3/4" screw coupling. If the hot utility water (HUW) distribution
is equipped with circulation circuit, the reverse pipe is connected to the inlet identified
as CIRCULATION. Types 100, 125, 160 NTR and 100, 125, 160 NTR / HV are equipped with a drain
outlet. A "T" plumbing with a drain valve has to be mounted in type 200 and 250 NTR(R) on the
HSW inlet. The tank shall be equipped with a safety valve to ensure the operation. The safety
valve is mounted on the cold water inlet identified with a blue ring. We recommend that the hot
water distribution from the heater was as short as possible to minimize heat losses. Tanks must
be provided with a discharge valve mounted on the cold service water inlet into the heater
for potential disassembly or repair.
Every hot utility water pressure tank shall be equipped with membrane spring loaded with safety
valve. Safety valve shall be easily accessible, fitted as close as possible to the tank. The inlet pipes
must have at least the same clearance as the safety valve. Safety valve is placed high enough to
secure dripping water drain by gravity. We recommend mounting the safety valve onto a branch
pipe. Easier exchange without the necessity of draining water from the tank. Safety valves with
fixed pressure settings from the manufacturer are used for the assembly. The starting pressure
of the safety valve must be identical to the maximum allowed pressure of the tank, and at least
20 % higher than is the maximum pressure in the water main (Table 10). If the water main
pressure exceeds such value, a reduction valve must be added to the system. No closing
armature may be mounted between the tank and the safety valve. During assembly, follow the
guide provided by the safety equipment manufacturer.
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 regular operation, such a check needs to be carried out at least once a month,
and after each shutdown of the tank longer than 5 days. Water may be dripping off the drain
pipe of the safety valve; the pipe must be open into the air, pointed down; environment
temperatures must not drop below zero. When draining the tank, use the recommended drain
valve. First of all, close water inlet in the tank. Find necessary pressure values in the following
table. For proper safety valve operation, a backflow valve shall be mounted on the inlet pipes,
preventing spontaneous heater draining of the tank and hot water penetration back into
the water main.
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