Gas Connection And Piping - Viessmann Vitodens 200-W, Series B2HA 40 Installation Instructions Manual

Vitodens 200-W B2HA 45, 60 Installation
Connections
(continued)
Legend
A Gas connection 7 1 in. (NPT)
B Accessible manual gas shutoff valve
C Ground joint union
D Drip leg

Gas connection and piping

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.
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 B2HA Service Instructions
for applicable system coding information.
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
Regarding operation with LPG, we recommend the
installation of an external safety solenoid valve when
installing the boiler in rooms below ground level.
Boiler Connections
19