31
5773 597 - 04
Vitocrossal 200, CM2 400, 500 and 620 Installation
Boiler
Gas Connections
(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.
See Vitocrossal 200 CM2 Series 400 to 620
Service Instructions for applicable system
coding information.
Legend
A
Manual test firing valve
B
Gas Valve
C
O-ring
D
Gas valve flange
E
Mounting nuts
F
Nipple
G
Elbow
H
Nipple
I
Manual gas shutoff valve
J
Nipple (field supplied)
K
Ground joint union (recommended) (field supplied)
WARNING
Escaped gas may lead to an explosion, which could
cause severe injuries or property damage.
Valve leak test
This is a test for checking the leakness tightness of the
valve and flange connections. It is recommended that
this test be included in the scheduled inspection and
maintenance procedures.
This test should only be performed by a trained licensed
heating contractor.
1. Close the manual test firing valve
A
.
2. Open the manual gas shutoff valve
G
.
3. Leak test all connections with a certified leak detector.
4. Close the manual gas shutoff valve
G
.
5. Open the manual test firing valve
A
.
6. Repair any leaks if necessary.
IMPORTANT
