Viessmann Vitoflex 300-UF Series Installation And Operating Instructions Manual page 27

Vitoflex 300-UF Installation & Operating
Safety Devices
The safety equipment for the heating installation must be installed by a heating contractor authorized to do so.
Legend
A Nipple, c in. x 1b in.
B Reducing coupling, c in. x b in.
C Boiler water temperature gauge
D Bushing c in. x a in.
E Nipple a in. x 2b in.
F Ball valve a in.
G Pressure gauge
H Sensor well - fixed high limit (sensor supplied)
I Safety heat exchanger connections, NPTM b in.
J PRV Pressure Relief Valve connection cap
K Reducing bushing
L Nipple
M Pressure relief valve, 30 psi or 60 psi
N Reducing bushing (UF 1250, 30 psi only)
O Nipple (UF 1250, 30 psi only)
G
C
F
E
B
D
A
U
See section Piping and Installation of Safety Devices
1
2 Two PRVs must be installed on the UF 1250 - 30 psi boiler. One PRV must be installed and the other PRV
connection must be capped on the UF 1250 - 60 psi boiler. All other models have only one PRV connection.
3 4 in. boiler flange for Vitoflex 300-UF 390-720, 6 in. boiler flange for Vitoflex 300-UF 950-1250
Note: All fittings shown and sensors indicated are
factory supplied. The size and quantity are
matched to the specific boiler model.
(continued)
2
I
I
H
T
S
P Pressure relief valve, 30 psi or 60 psi
(UF 1250, 30 psi only)
Q 4 in. or 6 in. Boiler supply flange
R Supply sensor well (sensor supplied)
S 4 in. or 6 in. Boiler return flange
T Return sensor well (sensor supplied)
U Sensor wells for thermal safety flush valve (Rb in.)
(sensor supplied)
1
P
M
O
L
I
N
J
K
3
3
Q
R
I
Mechanical
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