9
MAINTENANCE PROCEDURES
A. REPLACING HEATER TUBES
1)
DISCONNECT UNIT FROM POWER SOURCE.
2) Remove the side panels.
3) Remove heater tube wire from terminal block connection, keeping top and
bottom wires separate.
4) Lift heater tube retainers by loosening retaining screws and sliding the retainer plate up.
Hand tighten the plate to hold it up so the heater tubes will slide out freely.
5) Gently, pull defective heater tube out of unit.
6) Gently, put new heater tube into unit.
7) Loosen retainer screws and slide the retainer back into place. Tighten the screw to
secure the retainer in place over the ends of the heater tubes.
8) Reinstall side panels.
B. REPLACING FAN MOTOR
1)
DISCONNECT UNIT FROM POWER SOURCE
.
2) Remove screw from the air intake panel, located below the control box. Remove & wipe clean.
3) Remove the screws on the control box cover and remove cover.
4) Unplug power supply cord from fan motor.
5) Remove (4) screws, which hold fan motor and grill to the control box cover and remove fan.
6) Put replacement motor and grill in place and secure to the cover with screws.
7) Wipe the control box with a damp cloth, using mild detergent.
8) Reconnect power supply cord to fan motor.
9) Replace the control box cover & air intake panel. Fasten with screws removed in step 2 & 3.
C. REPLACING BELT DRIVE MOTOR
1)
DISCONNECT UNIT FROM POWER SOURCE.
2) Remove screw from the air intake panel, located below the control box. Remove & wipe clean.
3) Remove the screws on the control box cover and remove cover.
4) Remove the (3) screws on the side panel and remove panel.
5) Remove sprocket from motor shaft, using an Allen wrench and loosening the set-screw.
6) Remove the wire from terminal block connecting the drive motor to internal wiring.
On units rated 208 or 240 volts, note which color leads are being used for these connections
and which lead is capped with white tape. The new motor should use the same arrangement.
7) Remove screws holding motor in place and remove motor from unit.
8) Put new motor in place and attach loosely with mounting screws.
9) Replace sprocket on motor shaft.
NOTE: The two sprockets should line up parallel with each other, so the chain does not twist
any during operation. Also the hub gets installed closets to the motor.
8) Slide motor until the drive chain has about 1/4” slack when lightly pushed at the center of its top
open run.
See chain tensioning illustration
.
9) Tighten screws to secure motor.
10) Rewire leads same as removed in step 4.
11) Replace side panel, control box cover & air intake panel.
D. CLEANING AIR INTAKE
ONCE A WEEK
1)
DISCONNECT UNIT FROM POWER SOURCE.
2) Remove screw from the air intake panel. Remove & wipe clean
3) Use a vacuum cleaner and or a damp cloth to clean
the air intake. This procedure should be done at least every week.
E. LUBRICATE THE CHAIN & SPROCKETS
EVERY 6 MONTHS
1)
DISCONNECT UNIT FROM POWER SOURCE.
2) Remove side panels exposing chain drive.
3) Using an extreme pressure, synthetic chain lubricant with a
temperature range up to 400°F. Apply liberally onto chain
and sprockets. This grease is available as part no. 1P-Z8914.
4) Replace enclosure, Reconnect power source and test unit.
DT14 Chain Tension
1/4”
