GBT A2-035, Инструкция по установке и эксплуатации

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Page 9
Maximum Pressure Minimum Pressure
Natural Gas
9 5
Propane 15 13
Units: Inches of Water
The A2000 series water boiler/heater is not intended to operate at a gas supply
pressure other than shown on the rating plate. Exposure to a higher gas supply
pressure may cause damage to the gas valves, which can result in fire or explosion.
The gas supply piping must have a 3 inch (7.6 cm) minimum sediment trap
(sometimes referred to as a dirt trap or drip leg) and a manual shut off valve
ahead of the boiler/heater. The sediment trap should be located as close to the
heater as possible, be readily accessible and not subject to freezing conditions. A
union of the ground joint or flanged joint type must be installed in the gas supply
piping adjacent to the boiler/heater for ease of service.
It is important to guard against gas valve fouling from
contaminants in the gas piping. Fouling may cause
improper operation, fire or explosion. Clean the inside of
all supply pipe and fittings prior to insulation. Do not use Teflon tape. Use
only a joint compound suitable for natural gas and propane. Apply the joint
compound sparingly, only on the male threads and do not apply to the first
two threads.
To prevent damage, do not apply excessive torque when attaching the gas supply line
to the boiler/heater gas valve.
The gas supply piping must be adequately supported by using hangers or other suitable types of support. Do
not use the boiler/heater gas train to support the gas supply piping.
The boiler/heater and its gas connections must be leak tested prior to placing the unit in operation. Use soap
and water solutions or other material acceptable for the purpose of locating gas leaks. Do not use matches,
candles, flame, or other sources of ignition for this purpose.
During pressure testing, disconnect the heater/boiler from the gas supply if the test pressure is equal to or
greater than ½ psig (3.5 kPa). The gas supply line must be capped when not connected to the boiler during this
process. Relieve the gas pressure in the gas supply line prior to re-connecting to the boiler/heater. Failure to
follow this process may damage the gas valves and voids the warranty on the gas valves.
Do not subject the boiler/heater gas train components to pressures equal to or greater
than ½ psig. Damage to the gas valves may result.
Local codes may require the vents on the supply regulators and safety vent valves be piped to the outside.
When required, this piping is part of the gas supply piping and not part of the boiler/heater. It is important to
insure these vents are protected against blockage, with special care given to prevent blockage from rain,
condensation, ice, or snow.
When multiple appliances are fed gas from the same supply line, individual point of use regulators are
recommended to minimize variations in supply pressure.