Viessmann Vitocrossal 300 CA3 2.5 Installation And Service Instructions Manual page 53

Vitocrossal 300 CA3 Series 2.5 to 6.0 Installation/Service
Gas Connections
Legend
A Manual gas shutoff valve (supplied)
B Nipple (field supplied)
C Ground joint union (recommended) (field supplied)
D Elbow (field supplied)
E Cap (field supplied)
F On site gas line
Note: Illustration shown is a generic gas piping configuration,
which may vary depending on specific system layout/
requirements.
WARNING
Escaped gas may lead to an explosion, which could
cause severe injuries or property damage.
Note: Drip pocket shall be installed accordingly to
CAN/CSA B149.1 or National Fuel Code ANSI
Z223.1 / NFPA 54.
(continued)
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. 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.
Valve leak test
This is a test for checking the leak tightness of the valve
and flange connections. It is recommended that this test
be included in the scheduled inspection and maintenance
procedures.
IMPORTANT
This test should only be performed by a trained licensed
heating contractor.
1. Open the manual gas shutoff valve A.
2. Leak test all connections with a certified leak detector.
3. Close the manual gas shutoff valve A.
4. Repair any leaks if necessary.
Installation
53