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Installation Instructions
Singular Combi Boiler - BTC 439003301 B (2021/07)
5.2 Gas Piping
DANGER: FIRE, EXPLOSION
Do not connect to an unregulated or high pressure propane
line or to a high pressure commercial natural gas line.
The boiler must be isolated from the gas supply piping
system during any pressure testing of that system at test
pressures equal to or more than 0.5 psig.
WARNING:
Only a licensed professional should connect the gas
supplies.
Before connecting the gas supply, determine the gas
type and pressure for the boiler by referring to the rating
plate. Using a different gas type will result in abnormal
combustion and malfunction of the boiler causing fire or
explosion.
Leak test the appliance and its gas connection before
operating the boiler.
Do not attempt a field conversion without a conversion
kit. Use the Bosch conversion kit to convert from natural
gas to propane or vice versa. Failure to do so may result in
dangerous operating conditions and will void the warranty.
A sediment trap must be provided upstream of the gas
controls.
In the United States: The installation must conform with local codes or, in the
absence of local codes, the National Fuel Gas Code ANSI Z223.1/NFPA 54.
In Canada: The Installation must conform to CGA B149 INSTALLATION CODES and/
or local installation codes.
To ensure a suffi cient gas supply, it is recommended that the boiler be the fi rst
appliance to be connected to the gas supply line.
To connect the gas supply:
1. Determine the gas type and pressure by referring to the rating plate.
2. Perform a pressure test on the main gas supply line.
3. Purge the gas line of any debris.
4. Determine the proper type and size for the gas line. Refer to the gas pipe
sizing tables on page 25.
5. Install a union.
6. Install a manual gas shut off valve on the gas supply line within easy reach of
the appliance.
WARNING:
The manual gas shut off valve is not provided together with
the product.
Improper installation of the manual gas shut-off valve may
result in property damage, personal injury or death.
Only a licensed professional, in accordance with the ANSI
Z21.13/CSA4.9, should install the manual gas shut-off
valve.
7. Connect the gas supply line.
Figure 21
8. Check for gas leaks at all joints.
NOTICE: PRODUCT DAMAGE
Tighten the boiler connection valves with care to avoid
damage.
WARNING: FIRE, EXPLOSION, PROPERTY DAMAGE
Apply gas leak detection solution to all gas fittings.
The minimum internal diameter required for any appliance connector
is 3/4”.
When using fl exible gas lines, ensure that the pipe’s inner diameter and
connector is suffi cient to supply the required BTUs. Also, ensure that
the fl exible line has no crimps or tight bends in it, as this will restrict gas
fl ow.
To facilitate any future maintenance or service, the installation of a
union on the gas supply line close to the boiler is recommended.
