Laars mascot ft MFTHW, Installation And Operation Instructions Manual

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LAARS Heating Systems
Page 34
4.10 Gas Supply Pressure
The appliance and its individual shut-off valve must be disconnected from the gas supply piping system during any
pressure testing of the system at test pressures in excess of 1/2 psi (3.5 kPa).
The appliance must be isolated from the gas supply piping system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psi (3.5 kPa).
Loosen the pressure port bolts before you check the gas inlet pressure.
Inlet Gas Pressure Port
Manifold Pressure Port
Inlet Gas Pressure Port
Manifold Pressure Port
CAUTION
The minimum and maximum inlet gas line pressures must be
Natural Gas LP Gas
Maximum Pressure 10.5˝ WC Maximum Pressure 13.0” WC
Minimum Pressure 3.5˝ WC Minimum Pressure 8.0” WC
Gas Valve
199 MBH
Gas Valve
80 - 140 MBH