AAON HB-005 - Manual (Page 11)

11
warranty. Attach all service panels, and cover all
exposed equipment when work is not being performed.
Leave unit protected from other construction until start-
up is to occur.
Heating & Cooling Systems
GAS HEATING SYSTEM
The units are equipped with a direct spark ignition
system that proves the burner operation with each call
for heat. Power to the ignition control is 24V to reduce
hazards. Burner ignition is by a high intensity spark.
When heat is called for, the cooling system is
inoperable except for the indoor blower motor.
Heating is accomplished by firing gas into the heat
exchanger assembly.
IMPORTANT NOTICE - All gas-fired heat exchangers
are completely tested at the factory before shipment.
This will remove nearly all of the oils that have been
used in the manufacturing process, however trace
amounts may remain. When performing the initial
start-up at the jobsite it is highly recommended that
people, or any other living animals, that may be
sensitive to the residual odors or gases, NOT be
present in the conditioned space during start-up. In all
cases, including the initial factory firing and testing, all
of the gases will be under the minimum acceptable
level of concentration for human occupancy.
ELECTRIC HEATING SYSTEM
Heating is accomplished by passing electrical current
through a specified amount of resistance heaters that
produce the required heat. The indoor blower motor
energizes at the same time as the heaters.
DX COOLING SECTION
All direct expansion refrigeration systems are factory
assembled, charged with refrigerant, tested, and
operated. These systems include liquid line filter
driers, expansion valves, and fully hermetic scroll
compressors. Compressors are equipped with a
positive pressure forced lubrication system. The air-
cooled condenser coil is constructed of copper tubes
and mechanically bonded aluminum fins, and air is
pulled through by a propeller fan. The evaporator coil
is draw through type constructed of copper tubes and
mechanically bonded aluminum fins.
These appliances have been found acceptable with
applicable provisions of “ANSI/UL 1995” and current
“C.S.A. Standard C22.2” by E.T.L.
CHILLED WATER or NON-COMPRESSORIZED
COOLING SECTION
Chilled water, or non-compressorized units, have
factory-installed coils. Systems are provided with
internal header connections for field piping.
Coils are constructed of copper tubes and
mechanically bonded aluminum fins.
Always wear hand and eye protection when
handling, installing, servicing, or maintaining
equipment. Sharp or pointed edges, moving parts,
and flying debris may cause personal injury.
WARNING
DO NOT DRILL OR PUNCH HOLES IN THE UNIT
– The walls of this unit are foam insulated. Field
modifications to the unit casing may compromise
the unit’s superior insulating capability, in which
case excessive leakage, or condensation may
occur.
CAUTION
Very high temperatures can damage foam core
insulation. High heat may cause off gassing of
harmful fumes. Do not apply direct flame to unit
cabinet.
WARNING
Those sensitive to odors or gases from trace
amounts of residual oils should NOT be present in
the conditioned space during the start-up of a gas-
fired installation.
WARNING