Table of Contents
Advertisement
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 to use for lubrication. Greases of different
bases may not be compatible when mixed.
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 worn or cracked with an identically-sized belt. Belts that are too tight can cause excessive wear.
To check belt tension:
Press the belt midway between the sheave and the pulley and check for movement from 1/2 in. to 1 in. (12 mm to 25 mm). If
there is less than 1/2 in. (12 mm) of movement, the belt is too tight.
10.3.3 Electronic Variable Speed Drive - Inverter
An optional, variable-speed drive is available. This packaged unit is factory-set and should not require field adjustment. If
you suspect a problem with the inverter, contact the factory.
To removing VSD from the unit:
1.
Turn off power at the unit disconnect.
2. Open the unit accent panel and electric box cover.
3. Find the main fan motor wires, which are connected to the motor overload relay in the high-voltage section of
the electric box.
a. Mark motor wires to ensure they can be reconnected in the 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 to gain 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 on the unit.
7. Reconnect the motor wires to the overload and close the electric box cover and unit accent panel.
8. Restore power at the disconnect.
10 Maintenance
97
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
