Gas Supply And Piping; General - Bosch BGH96M060B3B Installation Instructions Manual

9 Gas Supply and Piping

WARNING: FIRE OR EXPLOSION HAZARD
Never purge a gas line into a combustion chamber. Never
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test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection
of leaks to check all connections.
WARNING: FIRE OR EXPLOSION HAZARD
Use proper length of pipe to avoid stress on gas control
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manifold and to prevent a gas leak.
CAUTION: FURNACE OVERHEAT HAZARD
Connect gas pipe to gas valve using a backup wrench
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to avoid damaging gas controls and to avoid burner
misalignment.
WARNING: FIRE OR EXPLOSION HAZARD
If local codes allow the use of a flexible gas appliance
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connector, always use a new listed connector. Do not use
a connector which has previously served another gas
appliance. Black iron pipe shall be installed at the furnace
gas control valve and extend a minimum of 2 inches
outside the furnace.

9.1 General

The furnace rating plate includes the approved furnace gas input rating and gas
types. The furnace must be equipped to operate on the type of gas applied. This
includes any conversion kits required for alternate fuels and/or high altitude.
Inlet gas supply pressures must be maintained within the ranges specified in Table
14. The supply pressure must be constant and available with all other household
gas-fired appliances operating. The minimum gas supply pressure must be
maintained to prevent unreliable ignition. The maximum must not be exceeded to
prevent unit overfiring.
Natural Gas Minimum: 4.5 in. WC
Propane Gas Minimum:11.0 in. WC
Table 14
Inlet Gas Supply Pressure
Bosch 96% AFUE Condensing Gas Furnace - BTC 770503101 J (06.2023)
Inlet Gas Supply Pressure
Maximum:10.5 in. WC
Maximum:13.0 in. WC
NOTICE:
Adjusting the minimum supply pressure below the limits
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in Table 14 could lead to unreliable ignition. Gas input to
the burners must not exceed the rated input shown on
the rating plate. Overfiring of the furnace can result in
premature heat exchanger failure. Gas pressures in excess
of 13 in. WC can also cause permanent damage to the gas
valve.
At all altitudes and with either fuel，(natural gas or LP), the air temperature rise
must be within the range listed on the furnace nameplate. Should this appliance be
converted to LP,， refer to the instructions included in the factory authorized natural
gas to LP conversion kit.
Installation Instructions
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