29
5797 344 - 01
Vitoflex 300-UF Installation & Operating
Mechanical
Customer supplied:
-
PDP
Pressure relief valve drain pipe
-
DCW
Cold water inlet, min. 36 psi (2.5 bar), max.
51 psi (3.5 bar)
-
AV
Air separator / vent
-
EXP
Expansion tank closed;
- for safety heat exchanger required (size according
to volume of safety heat exchanger loops and volume
of piping
- for heating system (optional)
-
WSL
Water supply line for safety heat exchanger
-
WLV
Water supply line for thermal run-off safety valve
-
SDP
Safety heat exchanger drain pipe
-
SRL
System return line to the boiler from the system
-
SSL
System supply line from the boiler to the system
-
BPL
Bypass line
-
BR
Boiler return
-
BS
Boiler supply
Note:
The UF 1250, 30 psi will have 2 PRVs.
Piping and Installation of Safety Devices
(continued)
Thermal safety flush valve
Boiler Model
Thermal safety
flush valve
TS-2430
(Quantity)
Water through-
put required at
36 psi (2.5 bar)
L/h GPM
Supply line
WSL
Supply line
WLV
Drain pipe
SDP
2
UF
390
1
1637 7.2
R
c
in.
R
c
in.
R 1 in.
UF
530
1
2224 9.8
R
c
in.
R
c
in.
R 1 in.
UF
720
2
3020 13.3
R 1 in.
R
c
in.
R 1 in.
UF
950
2
3986 17.6
R 1 in.
R
c
in.
R 1 in.
UF
1250
2
5246 23.0
R 1
a
in.
R
c
in.
R 1 in.
1
Threaded connection for supply line
2
Length of the drain pipe up to 13 ft. (4.0 m)
Pressure relief valve
Boiler model
Pressure relief valve Conbraco
1
Drain pipe PDP
2
30 psi
60 psi
30 psi
60 psi
UF
390
1
a
in.
1 in.
1
b
in.
1
a
in.
UF
530
1
b
in.
1
a
in.
2 in.
1
b
in.
UF
720
2 in.
1
a
in.
2
b
in.
1
b
in.
UF
950
2 in.
1
b
in.
2
b
in.
2 in.
UF
1250
2 in.
2 in.
2
b
in.
2 in.
Note:
To reliably prevent boiler corrosion caused by
condensation of flue gases, the boiler return
temperature must not under any circumstances be
below 150°F (65°C).
A Viessmann sized boiler pump with a boiler mixing
valve are provided according to the tables below.
The boiler circuit should be designed such that the
temperature difference between the supply and the
return temperature is equal to or less than
∆
t 27°F
(15°C).
The expansion tank has to be connected to the
boiler without any isolation valves.
Safety equipment supplied by Viessmann:
-
M 20
Boiler pump
-
Y 20
Boiler mixing valve
-
PRV
Pressure relief valve, pressure set to 30 or 60 psi
-
TS2430
Thermal safety flush valve R ¾ in., approved
component; special-purpose, designed for opening at
a temperature of 122 - 248°F (50 - 120°C), (safety
heat exchanger loop built into boiler). The Vitoflex
300-UF 390 and Vitoflex 300-UF 530 have two safety
heat exchanger loops and require one thermal safety
flush
valve.
The
Vitoflex 300-UF 720 to Vitoflex 300-UF 1250 have
four safety heat exchanger loops and require two
thermal safety flush valves.
-
LWCO
Low water cut-off
-
PG
Pressure gauge
-
TG
Temperature gauge (thermometer)
-
SHE
Safety heat exchanger, water volume 1.1 USG
(4.2L) per loop, NPTM
b
in.
Design Recommendation:
