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2.0 INSTALLATION (Continued)
GAS CONNECTION
The serial plate on the lower right side of the unit indicates the type of gas your unit is equipped
to burn. Do NOT connect to any other gas type.
A 3/4" NPT line is provided at the rear for the connection. Each unit is equipped with an internal
pressure regulator which is set for 3.5" W.C. manifold pressure for natural gas and 4.0" W.C. for
propane gas. Use 1/8" pipe tap on the downstream side of the combination valve for checking
pressure.
An adequate gas supply is imperative. Undersized or low pressure lines will restrict the volume
of gas required for satisfactory performance. A steady pressure, minimum 6" W.C. for natural
gas and minimum 11" W.C. for propane gas, is recommended. With all units operating
simultaneously, the manifold pressure on all units should not show any appreciable drop.
Fluctuations of more than 25% on natural gas, and 10% on propane gas, will create pilot
problems and affect burner operating characteristics. Contact your gas company for correct
supply line sizes.
Purge the supply line to clean out any dust, dirt, or other foreign matter before connecting the
line to the unit. It is recommended that an individual manual shut off valve be installed in the
gas supply line to the unit. Use pipe joint compound which is suitable for use with LP gas on all
threaded connections. Test pipe connections thoroughly for gas leaks.
WARNING: All connections must be checked for leaks, after the unit has been
put in operation. Use soapy water only for testing on all gases. Never use an
open flame to check for gas leaks.
NOTICE: If applicable, the vent line from the gas appliance pressure regulator shall be
installed to the outdoors in accordance with local codes or, in the absence of local codes, with
the National Fuel Gas Code, ANSI Z223.1/NFPA 54, or the Natural Gas and Propane Installation
Code CSA B149.1, as applicable.
NOTICE: If this equipment is being installed at over 2,000 feet altitude and was not so specified
on order, contact service department. Failure to install with proper orifice sizing may void the
warranty.