Buderus Logalux LTD950, Installation Instructions For Contractors

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5 Fitting
Logalux LTN/LTD/LTH/LF 400...3000 – 6 720 818 806 (2015/12) 12
Fig. 7 Connection diagram for hydraulic connection with 2 water heaters
AW DHW outlet
EK Cold water inlet
EZ DHW circulation inlet
[1] Diaphragm safety valve, component-tested in accordance
with DIN 4753-1 (1 piece per cylinder, if these can be shut
off individually)
[2] Drain valve
[3] Shut-off device
[4] Air vent valve
[5] Shut-off valve with drain valve
[6] DHW circulation pump with timer
[7] Non-return valve
[8] Pressure reducer; if the line pressure is higher than 80 % of
the response pressure of the pressure relief valve
[9] Test valve
[10] Non-return component
[11] Pressure gauge connector in accordance with DIN 4753-1
< 1000 litres cylinder capacity; pressure gauge in
accordance with DIN 4753-1 > 1000 litres cylinder capacity
[12] Tee and drain valve (important for quicker flushing/draining)
[13] Temperature sensor; high limit safety cut-out with flow
temperature > 110 °C
[14] Temperature sensor for temperature controller
[17] Water filter
[18] Setting element
[19] Thermometers
[1...19] All parts provided by the customer.
Pressure relief valve (provided by the customer)
▶ Attach a notice with the following text to the pressure relief valve:
"Never close the discharge pipe. Water may escape for safety
reasons during heating."
▶ Design the cross section of the discharge pipe in such a way, that it at
least matches the outlet cross section of the pressure relief valve
(

Tab. 8).
▶ Test the standby status of the pressure relief valve from time to time
by venting it.
Checking for leaks
▶ Check all connections and the cover of the inspection aperture for leaks.
6 720 817 906-05.1T
13
1
17
19
18
VHF
RHF
2
3
3
12
8 10 11
9
14
4
5
3
6
7
3
AW
EZ
EK
3
3
3
3
Connection diameter
at least Rated content of the
water vessel
Maximum
heat output
1)
1) Output information in accordance with DIN 4708 in the case of Tv = 80 °C or steam positive pressure = 1 bar. Observe the relevant max. heating output for other flow
temperatures and steam pressures.
Series
I kW LT...N LT...H LT...D LF
DN20 200...1000 150 400...950 400...550
DN25 1000...5000 250 1500 750...950 400...1500 400...950
DN32 > 5000 1000 2000...3000 1500...3000 2000...3000 1500...3000
Table 8 Sizing the discharge pipe