Gas Supply And Gas Pipe Sizing; Gas Connections - Takagi T-KJr2-IN Installation Manual And Owner's Manual

GAS SUPPLY AND GAS PIPE SIZING

WARNING
The minimum and maximum inlet gas pressures are:
Gas type
Natural Gas
Propane
Gas pressure above this specified range for the water heater and/or insufficient gas volume will
adversely affect performance. These pressures are measured when the water heater is in full
operation.
Inlet gas pressure must not exceed the above maximum values; gas pressure above the specified
range will cause dangerous operating conditions and damage to the unit.
Until testing of the main gas line supply pressure is completed, ensure the gas line to the water
heater is disconnected to avoid any damage to the water heater.
1. Install a manual gas shut-off valve between the water heater and the gas supply line.
2. When the gas connections are completed, it is necessary to perform a gas leak test (see below)
either by applying soapy water to all gas fittings and observing for bubbles or by using a gas leak
detection device.
The water heater and its individual shutoff valve must be disconnected from the gas supply
piping system during any pressure testing of that system at test pressures in excess of 1/2 psi
(3.5 kPa).
The water heater must be isolated from the gas supply piping system by closing its individual
manual shutoff valve during any pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 psi (3.5kPa).
3. Always purge the gas line of any debris and/or water before connecting to the gas inlet.
Size the gas pipe appropriately to supply the necessary volume of gas required for
NOTICE
the water heater using ANSI233.1/NFPA 54 in the USA or CAN/CSA B149.1 in Canada
or local codes. Otherwise, flow capabilities and output temperatures will be limited.
Check that the type of gas matches the rating plate first.
Ensure that any and all gas regulators used are operating properly and
providing gas pressures within the specified range shown below. Excess gas
inlet pressure may cause serious accidents.
Conversion of this unit from natural gas to propane or vise versa will void all
warranty. Contact your local distributor to get the correct unit for your gas
type. The manufacturer is not liable for any property and/or personal
damage resulting from gas conversions.
Inlet gas pressure
Min. 5.0" WC – Max. 10.5" WC
Min. 8.0" WC – Max. 14.0" WC

-Gas connections-

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Installation