AAON SA-070 - Manual (Page 41)

41
Hot Water Coil
Factory installed one or two row hot water
heating coils can be factory mounted. These
coils are supplied from a hot water source
through separate piping from the condenser
water source. All controls for heating
operation are field supplied and field
installed.
Always connect the supply to the top of the
coil and the return to the bottom. Water coils
should not be subjected to entering air
temperatures below 38°F to prevent coil
freeze-up. If air temperature across the coil
is going to be below this value, use a glycol
solution to match the coldest air expected.
Chilled Water Coil
Factory installed four or six row chilled
water cooling coils can be factory mounted.
These coils are supplied from a chilled water
source through separate piping from the
condenser water source. All controls for the
cooling coil are field supplied and field
installed.
Startup
(See back of the manual for startup form)
During startup, it is necessary to perform
routine checks on the performance of the
unit. This includes checking of the air flow,
the air filters, condenser water flow and
refrigerant charge.
Supply Fans
SA Series units are equipped with direct
drive backward curved plenum supply fan
assemblies that deliver the air volume
specified according to unit size and job
requirements.
Supply Fan Spring Isolator Adjustment
Piping shall be in accordance with
national and local codes. Pressure
limiting devices, backflow preventers
and all other safety requirements are
the sole responsibility of the installing
contractor.
WARNING
Improper installation, adjustment,
alteration, service or maintenance
can
cause property damage,
personal injury or loss of life. Startup
and service must be performed by a
Factory Trained Service Technician.
A copy of this IOM should be kept
with the unit.
WARNING
Failure to adjust the blower isolation
springs may cause premature failure
of the blower bulkhead and/or blower
assembly. These damages will not be
covered by warranty. Blower isolation
springs must be adjusted by installing
contractor prior to unit start up.
Springs must be adjusted such that
the blower assembly is “free floating”
and “level”.
CAUTION