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Indirect Fired Tube Heater
FIRE OR EXPLOSION HAZARD
• Failure to follow safety warnings exactly could result in
serious injury, death, or property damage
• Be sure to read and understand the installation, operation,
and service instructions in this manual
• Improper installation, adjustment alteration, service, or
maintenance can cause serious injury, death, or property
damage
• Do not store or use gasoline or other flammable vapors and
liquids in the vicinity of this or other appliances
WHAT TO DO IF YOU SMELL GAS:
— Do not try to light any appliance
— Do not touch any electrical switch; do not use any phone
in the building
— Leave the building immediately
— Immediately call your gas supplier, follow the gas
supplier's instructions
— If you cannot reach your gas supplier, call the Fire
Department
Installation and service must be performed by a qualified
installer, service agency, or gas supplier
The optional gas heat furnace design consists of a tubular
heat exchanger(s), burner manifold with gas valve, induced
combustion blower, gas heat control module and all operational
safeties. The tubular heat exchanger is standard with stainless
steel construction. The safety switches include a high-limit
temperature switch, an auxiliary high-limit switch, a combustion
blower proof of airflow, and the flame roll-out switch.
The high limit switch is an automatic reset switch and it opens
up at 160°F to shut the furnace down and closes at 130°F. The
auxiliary limit switch is a manual reset and opens up at 180°F
to shut the furnace down.
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.
www.DaikinApplied.com
DANGER
Gas Piping
All field gas piping must be pressure/leak tested prior to
operation. NEVER use an open flame to check for leaks. Use
a soap solution or other leak detecting solution.
Gas pressure to appliance controls must never exceed 13.5"
w.c. (½ psi)
Installation of piping must conform with local building codes
and ordinances, or in the absence of local codes with ANSI
Z223.1 the National Fuel Gas Code. In Canada, installation
must be in accordance with CAN/CGA –B149.1 for Natural
gas and B149.2 for propane units. A gas regulator servicing
multiple units must have the proper pipe size and internal
orifice for the total input of all heating units serviced by that
regulator. A field supplied sediment trap and shut off valve is to
be provided at the Daikin unit.
The gas furnace gas piping was leak tested prior to shipping.
However, during shipping and installation connections may
have loosened. Check for leaks using a soap solution and
correct any leaks before placing furnace in operation.
Minimum Gas Pressure
Individual duct furnaces require a minimum gas pressure noted
in
Table 28
Table 28: Minimum Gas Pressure
Individual Furnace Size
50,000 to 400,000 BTUH
<400,000 BTUH
The Daikin furnace modules have a maximum inlet pressure
of 13.5" w.c. Installer is responsible for supplying a pressure
regulator if required.
Airflow Requirements
When variable air moving (2 stage or variable frequency drive)
is provided by others the allowable minimum cfm to the duct
furnace is 2/3 (67%) of the listed minimum CFM for the furnace
model when applied as follows:
1. The unit has two stage or modulating gas controls.
2. The air handling unit is equipped with a discharge air
controller.
3. The system does not include a room thermostat.
Systems utilizing variable air volume to maintain the desired
building pressure require separate control of the heating unit
input to insure that the maximum temperature rise of the duct
furnace is not exceeded. Consult the factory for assistance with
system control design in these applications.
45
IM 777-18 • SKYLINE OUTDOOR AIR HANDLER
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WARNING
Natural Gas
Propane Gas
5.0" w.c.
11.0" w.c.
6.0" w.c.
12.0" w.c.
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