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Connections
(continued)
Gas connection and piping
Fig. 13 Gas pipe connections
Legend
Gas connection ∅ 1" (NPT)
Accessible manual gas
shutoff valve
Ground joint union
Drip leg
WARNING
The gas supply piping must be leak
tested before placing the boiler in
operation.
CAUTION
Ensure that gas piping is large
enough for all appliances in the
residence. No noticeable gas
pressure drop in the gas line must
occur when any unit (or combination
of units) lights or runs.
Boiler Connections
1. Refer to current CAN/CSA B149.1
and .2 or National Fuel Gas Code
ANSI Z223.1/NFPA 54, as well as
local codes for gas piping
requirements and sizing. Pipe size to
the boiler must be determined based
on:
– pipe length
– number of fittings
– type of gas
– maximum input requirements of all
gas appliances in the residence.
IMPORTANT
Design piping layout in such a way that
piping does not interfere with
serviceable components.
2. Before connecting boiler to gas line,
install ground joint union, capped
drip leg and a manual equipment
shutoff valve as shown. Valves must
be listed by a nationally recognized
testing agency. Make boiler gas
connection as shown in Fig. 13.
3. Perform gas piping pressure test as
described in the following
subsection.
IMPORTANT
Max. gas supply pressure: 14 "w.c.
4. Identify shutoff valves as such with
a tab and familiarize
operator/ultimate owner of boiler
with these valves.
See Vitodens 200-W WB2B
Start-up/Service Instructions
for applicable system coding
information.
17
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