16
5773 597 - 04
Vitocrossal 200, CM2 400, 500 and 620 Installation
Safety Header
1. Locate safety port on boiler.
2. Install safety header to safety port.
Water pressure:
75 psi (5.2 bar)
Testing pressure:
112 psi (8.2 bar)
Min. water pressure: 8 psi (0.5 bar)
Note:
The minimum water pressure is necessary for safe
operation.
Safety valve:
All boilers must have a pressure relief valve.
Note:
Make all connections free of load and torque stresses.
* Counter flanges ANSI 4” gaskets and hardware (field
supplied)
CAUTION
Do not connect heating system to safety header.
Boiler Connections
(continued)
Legend
1
Boiler return: (ANSI 4 in.)*
2
Boiler supply: (ANSI 4 in.)*
3
Safety port (Safety valve, low water cutoff and
automatic air vent) NPT 1
a
A
Cross 1
a
in.
B
Hex bushing 1
a
in. x
e
in.
C
Air vent with shut-off base
D
Hex bushing 1
a
in. x
c
in.
E
90° Street elbow 1 in.
F
Nipple 1 in. x 2 in.
G
Pressure relief valve, 75 psi
H
Low water cutoff
4
Pressure gauge fem. connection NPT
b
in.
I
Hex bushing
b
in. x
a
in.
J
Pressure gauge
5
Drain and fitting for membrane expansion tank
6
Condensing water drain NPT
b
in.
K
Tee 1
b
in
x 1
b
in. x
c
in.
L
Sediment faucet
c
in.
M
Hex bushing 1
a
in. x 1 in.
7
Gas line fittings
N
Nipple, 1
a
in. x 2
b
in.
O
90° Elbow, 1
a
in.
P
Gas ball valve, 1
a
in.
Q
Reduction tee 1
b
in
x 1
b
in. x
c
in.
Boiler
