AAON M2-036 - Manual (Page 79)

79
Electric Heating
Set thermostat in the heat mode; call for heat
to engage all electric heat strips. Check
blower for proper rotation and voltage.
Measure the amperage and voltage.
Compare them to the nameplate data.
If applicable, check remote heat pump
condenser as per the manufacturer’s
recommendations.
Steam or Hot Water Heating
Set thermostat in the heat mode. Observe
supply blower for proper rotation and
voltage. Check boiler or hot water operation
according to the manufacturer’s instructions.
Check control flow valves for correct
operation and settings per the
manufacturer’s instructions.
Cleaning
Inspect and clean unit interior at the
beginning of each heating and cooling
season and as operating conditions require.
Chilled Water
Check remote chiller operations as per the
manufacturer’s instructions. Check coolant
flow valves for correct operation and
settings.
Lubrication
Most motors and bearings are permanently
lubricated. Some applications may require
that bearings be re-lubricated periodically.
The schedule will depend on the operating
duty, temperature variations, and other
atmospheric conditions.
For bearings equipped with lubrication
fittings, the lubrication schedule is
dependent on operating temperatures and
rotational speeds as shown in the table
below. Lithium based grease conforming to
an NLGI grade No. 2 consistency is
recommended. This medium viscosity, low
torque grease is rust inhibiting and water-
resistant. It is satisfactory for operating
temperatures in the range of –10
°F to 250°F.
Bearings should only be re-lubricated when
at normal operating temperatures and not
running. Rotate the fan shaft by hand,
adding only enough grease to purge the
seals. A one-inch bearing has a total grease
capacity of only .25 ounces. Added grease
should be limited to .09 ounces.
Do Not Over Lubricate!
Recommended greases are:
SHELL OIL - DOLIUM R
CHEVRON OIL - SRI No. 2
TEXACO INC. - PREMIUM RB
Table 16 - Fan Bearing Lubrication
Schedule
Fan
Speed
Temp. Environ.
Greasing
Interval
500
rpm
Up to
150 °F
Clean
2 to 6
months
1000
rpm
Up to
210 °F
Clean
2 weeks to
2 months
1500
rpm
Up to
210 °F
Clean Monthly
Any
Speed
Up to
150 °F
Dirty
1 week to
1 month
Any
Speed
210 -
250 °F
Dirty Weekly
In the event the unit is not functioning
correctly and a service company is required,
only a company with service technicians
qualified and experienced in both
commercial heating and air conditioning
should be permitted to service the systems in
order to keep warranties in effect. The
service tech may call the factory if
assistance is required.