Technical data

16
5584 069 - 05
Vitocrossal 200, CM2 400, 500, 620 and 620 TX 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 1a
A Cross 1a in.
B Hex bushing 1a in. x e in.
C Air vent with shut-off base
D Hex bushing 1a 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 1b in x 1b in. x c in.
L Sediment faucet c in.
M Hex bushing 1a in. x 1 in.
7 Gas line fittings
N Nipple, 1a in. x 2b in.
O 90° Elbow, 1a in.
P Gas ball valve, 1a in.
Q Reduction tee 1b in x 1b in. x
c in.
Boiler