Technical data

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5600 332 -06
Vitodens 100-W, WB1B Installation & Service
Safety Connections and Pressure Testing
Connections
Installing safety devices on the boiler
Legend
A Pressure relief valve (30 psig),¾” NPT
B Brass nipple, length 2” x ¾”
C Drain valve connection, ¾”
D Tee, ¾”x¾”x¾”
E Brass nipple, length 3” x ¾”
F Tee, ¾”x¾”x¾”
L Boiler supply connection
1. Remove loosely pre-assembled combination pressure
relief valve and drain valve assembly.
2. Apply sufficient amount of pipe sealant to both ends
of all pipe fittings B, C, and E, and install onto
tees D, F.
3. Install pressure relief valve A and tighten.
4. Install discharge pipe on pressure relief valve in such
a way that...
- the end of the pipe is not threaded.
- the pressure relief discharge pipe extends to a
floor drain and ends approximately 6” (150 mm)
above the drain.
Ensure that...
- there is no shutoff valve installed in the discharge pipe.
- discharge pipe diameter is not reduced.
- discharge is not piped to outdoors.
Minimum connection diameters:
Pressure relief valve..........................¾”
Discharge pipe .................................¾”
Piping to pre-charged expansion tank...¾”
Install the (approved) factory supplied pressure relief valve.
Removal of air from the system must occur via use of air
vent(s) in the system supply. To ensure the boiler can be
purged of all air, ensure supply/return water lines do not
contain restrictive piping where air could be trapped.
Low water cut-off
A low water cut-off may be required by local codes. If
boiler is installed above radiation level, a low water cut-off
device of approved type (field supplied) must be installed
in all instances. Do not install an isolation valve between
boiler and low water cutoff (see subsection entitled
“Boiler with low water cutoff” on page 48 in these
instructions).
IMPORTANT
WARNING
Do not install an isolation valve between boiler and
pressure relief valve.
The discharge pipe for the pressure relief valve must
be oriented to prevent scalding of attendants.
Pipe pressure relief valve discharge pipe close to floor
drain. Never pipe discharge pipe to the outdoors.