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Hot Water Boiler with Steel Body, Automatic Fuel Feed Operation and Maintenance Manual
In closed expansion tanks, the water inside the system can be observed with manometer.
Manometer is pressure gauge. The water in the boiler should show 1-1.5 bar pressure when it is cold.
Pressure will increase as the boiler water heats up.
Boilers to be fitted with closed expansion tank must be installed with appropriate safety
valve and automatic air vent.
For heating systems with closed expansion tank, safety valve must be used. The following table
shows the safety valve capacities that must be in ÜNMAK solid fuel, automatic loading boilers. It is
advisable to equip the system with double and appropriate safety valve against the risks of
calcification.
At least closed expansion tank volumes and safety valve connection diameters are given according to
boiler capacities. According to the boiler capacities and the number of floors applied, the expansion
tank volumes vary.
The number of floors given in the table has been accepted in the basement of the boiler and the
expansion tank.
Safety valve and closed expansion tank volumes which should be according to the rated boiler
capacity
BOILER
POWER
SAFETY
VALVE
CONNECTION
DIAMETER
NUMBER of FLOOR
(Mcal/h)
(inch)
1
2
3
4
5
6
7
8
9
10
11
12
25 (3 bar)
1/2"
18
34 (3 bar)
1/2"
25
25
35
45 (3 bar)
1/2"
35
35
50
50
50
60 (3 bar)
3/4"
50
50
50
80
80
100
80 (3 bar)
3/4"
50
80
80
80
100
150
200
100 (3 bar)
1"
80
80
80
100
150
150
200
300
