When writing to Daikin for service or replacement parts, refer
to the model number of the unit as stamped on the serial plate,
attached to the unit . If there is an in-warranty failure, state the
date of installation of the unit and the date of failure along with
an explanation of the malfunctions and the description of the
replacement parts required . Parts are warranted for ninety (90)
days unless covered by original unit warranty .
General
WARNING
Units equipped with gas heating must not be operated in an atmosphere
contaminated with chemicals which will corrode the unit such as halogenated
hydrocarbons, chlorine, cleaning solvents, refrigerants, swimming pool
exhaust, etc. Exposure to these compounds may cause severe damage to
the gas furnace and result in improper or dangerous operation. Operation
of the gas furnace in such a contaminated atmosphere constitutes product
abuse and will void all warranty coverage by the manufacturer. Questions
regarding specific contaminants should be referred to your local gas utility.
This forced draft gas burner is specifically designed for use
with the furnace on Daikin rooftop heating and air conditioning
units which are for outdoor installation only . Each model size
has unique burner head components to tailor the shape of the
flame to each particular stainless steel combustion chamber,
to match the capacity requirement, and to offer a desirable
turndown potential when arranged for modulation . This is a
forced draft burner with a high pressure combustion air fan and
will operate against pressure . This eliminates the need for draft
inducers, chimneys, draft hoods, barometric dampers, and
Breidert caps .
Warranty Exclusion
Warranty is void if the furnace is operated in the presence of
chlorinated vapors, if the airflow through the furnace is not in
accordance with rating plate, or if the wiring or controls have
been modified or tampered with.
Ventilation & Flue Pipe
Requirements
The Daikin rooftop unit is equipped with an outdoor air louver
to supply adequate combustion air. The unit also has a flue
outlet assembly and requires no additional chimney, flue pipe,
Breidert cap, draft inducer, etc .
Factory Mounting
This burner and gas train have been installed and wired at
the factory . See
Gas Piping Routing into Unit, page 7
.
Also note that Models 150 through 200 have the burner
removed for shipment;
Factory Checkout
This complete heating plant was fired and tested at the
factory. It was adjusted to the required capacity and efficiency.
Modulating air and gas linkages, pressure regulators, and
stops were adjusted for proper operation at all firing levels. The
unit was fired through several complete sequences of start-
up through shutoff to check operation. A check was made of
the air switch, gas pressure switch, high limit operation, and
combustion characteristics including CO
2
and CO (at several
firing rates on modulating burners).
If the burner was specified for operation at higher altitudes,
combustion air adjustments were compensated to result in
proper settings at the higher altitude . This checkout normally
eliminates on-the-job start-up problems; however, the
equipment is subject to variable job conditions and shipping
shocks can change adjustments, cause damage, and loosen
connections and fasteners . Therefore, it is necessary to go
through the complete start-up procedure even though the unit
may appear to be operating properly .
IM 684-6 • ROOFTOP SYSTEMS 4
www .DaikinApplied .com
Introduction
