10.3.1 Blower Motor Lubrication
• Motor is lubricated at the factory and does not require initial lubrication.
• Contact the motor manufacturer for the lubrication interval for motor bearings that have grease fittings.
• Contact the motor manufacturer to determine what type of grease touse for lubrication. Greases of different
bases may not be compatible whenmixed.
10.3.2 Belt Inspection
Check the drive belt monthly for signs of wear and for proper tension. With proper care, a belt should last several years.
Replace belts that appear wornor cracked withan identically-sized belt. Belts that are too tight can cause excessive wear.
To check belt tension:
Press the belt midway betweenthe sheave and the pulley and check for movement from 1/2in. to 1in. (12mm to25mm). If
there is less than1/2 in. (12mm)of movement, the belt is too tight.
10.3.3 Electronic Variable Speed Drive - Inverter
Anoptional, variable-speed drive is available. Thispackaged unit is factory-set and should not require field adjustment. If
yoususpect a problem withthe inverter, contact the factory.
To removing VSD from the unit:
1. Turnoff power at the unit disconnect.
2. Open the unit accent panel and electric box cover.
3. Find the mainfanmotor wires, whichare connected to the motor overload relay inthe high-voltage section of
the electric box.
a. Mark motor wires to ensure they canbe reconnected inthe same order.
b. Disconnect motor wires at the load side of the motor overload relay.
c. Close the electric box cover.
4. Remove the right front vertical panel togain access to the variable speed drive.
5. With the panel removed, restore power to the unit by turning the disconnect on.
6. Place the right front vertical panel back onthe unit.
7. Reconnect the motor wires tothe overload and close the electric box cover and unit accent panel.
8. Restore power at the disconnect.
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