6
Forced-Air Agricultural Construction Heater
Operating Instructions and Owner’s Manual
The appliance and its individual shut-off 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 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 or less than 1/2 psi (3.5 kPa).
A minimum 1/8” NPT plugged tapping, accessible for
test gauge connection, must be installed immediately
upstream of the gas supply connection to the appliance.
The heater is supplied after a complete functional test and
it’s therefore prearranged for one of the gas (natural or
LPG) indicated in Specification: an adhesive label applied
on the gas valve (Fig. 3) indicates the working gas (usually
it’s natural gas). Should it be necessary to change the kind
of gas (from natural gas to LPG or vice versa) follow the
detailed instructions indicated in section “Fuel Conversion"
Only when the heater has been prearranged according to
the proper working gas will it be possible to carry out the
following operations:
• Leak away some gas from the feed pipe;
• Check that the pipe is gas proof;
• Open the gas stop on/off valve and start the hot air
generator;
For installation in the U.S.A. at elevation above 2,000 feet
(610 m), the appliance shall be derated 4 per cent for each
1,000 feet (305 m) of elevation above sea level.
For installation in Canada at elevation above 2,000 feet to
4,500 feet above sea level, the heater is derated reducing
the output for the appropriate fuel in accordance with the
rating plate manifold pressure.
Having completed all these operations check carefully
that all electrical connections correspond to the wiring
diagram. When the heater is first turned on you must
check that the fan does not use more current than the
maximum permitted limit.
GAS LINE CONNECTIONS
The connection to the gas feed pipe, whose sizes must
correspond to the kind of system to be made, must be
carried out by placing the“gas valve”as indicated in Fig. 3:
the gas pipe, the interception tap and the anti-vibration
joint are not supplied with the heater and they must be
arranged by the person in charge of installation.
1: Filter-pressure regulator or filter
2: Anti vibration joint
3: Manual shut-off valve
4: Gas valve
In case of connection of heater to natural gas, the
installation shall conform with local codes or, in the
absence of local codes, with the National Fuel Gas Code
ANSI Z223.1/NFPA 54 and the Natural Gas and Propane
Installation Code, CSAB149.1.
In case of connection to a propane supply cylinder:
(a) the installation must conform with local codes or, in
the absence of local codes, with the Standard for the
Storage and Handling of Liquified Petroleum Gases,
ANSI/NFPA 58 and the Natural Gas and Propane
Installation Code, CSA B149.1.
(b) to determine size and capacity of the cylinder(s) and
for any specific requirements consult your LP gas sup-
plier. In any case propane tank should not be lower
than 100 lb (90 liters)
(c) the cylinder supply system shall be arranged to provide
for vapour withdrawal from the operating cylinder;
(d) the gas shall be turned off at the propane supply
cylinder when the heater is not in use;
(e) when the heater is to be stored indoors, the
connection between the propane supply cylinder and
the heater must be disconnected and the cylinders
removed from the heater and stored in accordance
with Standard for the Storage and Handling of
Liquefied Petroleum Gases, ANSI/NFPA 58 and CSA
B149.1, Natural Gas and Propane Installation Code.
Fig. 3
