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5784 568 - 18
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Connections
Boiler
Connections
(continued)
Gas connection and piping
(continued)
Max. gas supply pressure: 14 “w.c.
1. Refer to current CAN/CSA B149.1 or 2 in Canada.
In the United States, use the 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
- maximum input requirements of all gas appliances in
the residence.
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. Valves must be listed by a nationally
recognized testing agency. Make boiler gas
connection as shown on the left.
Gas connection (NPT)..................................
7
¾ in.
3. Perform gas piping pressure test as described in the
following
subsection.
4. Identify shutoff valves as such with a tab and
familiarize operator / ultimate owner of boiler with
these
valves.
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.
IMPORTANT
IMPORTANT
½ psig = 14 “w.c.
1. Isolate the boiler from the gas supply piping system
using the individual manual shutoff valve during
pressure tests equal to or less than ½ psig (14 “w.c.)
2. The boiler and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig (14 “w.c.)
3. Perform leak test. Use approved liquid spray solution
for bubble test. Ensure that no liquid is sprayed on
any electrical components, wires or connectors. Do
not allow leak detection fluid to contact gas valve
regulator or regulator vent opening.
4. Correct any and all deficiencies.
5. Remove air from gas line.
Gas piping pressure test
When performing the gas piping pressure test, ensure the
following requirements are met.
WARNING
Never check for gas leaks with an open flame.
WARNING
Exposing boiler gas pressure regulator and gas valve to
extreme pressures renders warranty null and void.
Legend
A
Gas connection
B
Accessible manual gas
shutoff (factory supplied)
C
Drip leg
