Set Up - PHP Heat Wagon LVF90A Service Manual

Set Up of Indirect Heaters
The proper set-up of indirect oil fired heaters is one of the most important
and usually overlooked aspects of utilizing indirect oil fired heaters. Proper
set-up can help eliminate nuisance shut downs and untimely service calls.
The most important set up requirements are the voltage to the heater, the
proper manufacturer's required fuel(s), and the proper ducting of the heated
air and/or the flue gases. It is important to note that this section in no way is
to supersede set-up instructions listed in the original manufacturer owners
manuals supplied with the heater.
Heat Ducting
Before attempting to duct an indirect-fired heater, refer to the owner's manual
to ensure that the heater is eligible to be ducted. Ducting a heater that is not
approved for duct can result in property damage, personal injury, or even
death. There are a few things to keep in mind when ducting a heater. First,
ensure that the duct is rated high enough for the heater's discharge tempera-
ture. Second, make sure that the duct I.D. is equal to the diameter of the
heater discharge. A larger I.D. solid wall or wire duct (no lay-flat) duct can be
used with some manufacturers. When dealing with duct length, remember
that the owner's manual will list a MAXIMUM duct length and this length
must be adhered to at all times! The owners manual assumes that the maxi-
mum duct length is the total length straight out from the nose of the heater.
As a general rule of thumb, for every bend in the duct, it cuts the maximum
length allowed in half. Also, to achieve the highest heating efficiency and to
alleviate static pressure issues, keep the elbows and bends down to the
absolute minimum.
Flue Pipe Ducting
Flue pipe ducting is the actual ducting of the byproducts of combustion. This
is done with a flue collar usually located on top of the heater. Many times,
improper flue pipe ducting leads to service issues. As stated earlier in the
Heat Ducting section, the number one source of information about proper
flue pipe ducting can be found in your owner's manual. The general rule
about the flue pipe diameter is that the diameter of the flue pipe that comes
with your heater is correct for that given length of the standard flue. If a
longer flue pipe is needed, then an adjustment will have to be made to the
make the flue pipe diameter larger. How large of an I.D. the flue pipe
requires is a direct correlation of how many BTU's the heater is and how long
the flue pipe run is needed. Draft hoods and adapters may be required to
increase the flue pipe discharge size. Refer to the chart on page 121 for flue
pipe sizing.
144