Maintenance Procedures - Holman QCS-1 SERIES Installation And Operation Instructions Manual

MAINTENANCE PROCEDURES

A. REPLACING HEATER TUBES
1) DISCONNECT UNIT FROM POWER SOURCE.
2) Remove the enclosure, by removing the screws on both the back and bottom of the unit and
lifting the enclosure's back up fi rst and pulling away from the unit.
3) Remove heater tube wires from terminal block connection, keeping top and
bottom wires separate.
4) Lift heater tube retainers by loosening retaining screws and sliding the retainer plate.
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) Install the heater tube wires to the terminal block, and reinstall the enclosure.
9) Connect unit to power source and test by toasting some bread after unit has properly reached
operating temperature.
B. REPLACING FAN MOTOR
1) DISCONNECT UNIT FROM POWER SOURCE.
2) Remove the enclosure, by removing the screws on both the back and bottom of the unit and
lifting the enclosure's back up fi rst and pulling away from the unit.
3) Remove the enclosure and the back panel.
4) Unplug power supply cord from fan motor.
5) Remove (4) screws, which hold fan motor and grill to bottom of unit and remove fan.
6) Put replacement motor and grill in place and secure to the bottom of unit with screws.
7) Reconnect power supply cord to fan motor.
8) Replace back panel and enclosure. Fasten with screws removed in step 2.
C. REPLACING BELT DRIVE MOTOR
1) DISCONNECT UNIT FROM POWER SOURCE.
2) Remove the enclosure, by removing the screws on both the back and bottom of the unit and
lifting the enclosure's back up fi rst and pulling away from the unit.
3) Remove sprocket from motor shaft, using an Allen wrench and loosening the set-screw.
4) 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.
5) Remove screws holding motor in place and remove motor from unit.
6) Put new motor in place and attach loosely with mounting screws.
7) Replace sprocket on motor shaft.
NOTE: The two sprockets should line up FLUSH 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 and control box cover.
D. CLEANING AIR INTAKE
1) DISCONNECT UNIT FROM POWER SOURCE.
2) Place unit on its backside.
3) Use a vacuum cleaner and or a damp cloth to clean
the air intake. This procedure should be done at least
ONCE A WEEK.
6
1/4"
QCS/RCS Chain Tension