Flagro FVP-750 Operating Instructions Manual page 5

The gas must be turned off at the propane supply cylinder(s) when the heater is
not in use. When the heater is to be stored indoors, the connection between the
propane supply cylinder(s) and the heater must be disconnected and the
cylinders removed from the heater and stored in accordance with Standard for
the Storage and Handling or Liquefied Petroleum Gases, ANSI/NFPA 58 and
CSA B149.1, Natural Gas and Propane Installation Code.
PIPING: This heater must be installed by a qualified gas technician following
local codes published by the authority having jurisdiction. Sizing of
supply piping must be determined using the length of pipe run as
well as total btuh rating of the appliance(s). Appropriate piping
tables must be used to determine size of supply piping dependant
on the length of run from source.
PRESSURES:
FUEL:
HOSES:
MAXIMUM INLET PRESSURES:
MINIMUM INLET PRESSURES:
This heater must be supplied by pressures indicated on the
approval label. Over pressure may cause controls to fail.
DO NOT supply this heater with more than ½ psig
(14.0 in. W.C.)
Note: A second stage regulator must be installed if the
supply pressure exceeds ½ psig.
This heater will operate on propane OR natural gas. The
fuel selector valve must be in the correct position (LP or NG)
before operating. The manifold pressures are listed on the
approval label. To determine which fuel to use see rating
plate. DO NOT attempt to use the heater without consulting
the rating plate.
All hoses used to connect this heater of fuel supply must be
Type 1 approved propane / natural gas hose assemblies.
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LP: 14.0 IN. WC.
NG: 14.0 IN. WC.
LP: 8.0 IN. WC.
NG: 7.0 IN. WC.