Qmark High Velocity Electric Heated - Manual (Page 6)

OPERATION
1. After power has been connected to unit, unit is ready to
respond to its control devices such as the thermostat or door
switches.
2. Air direction at outlet can be controlled by adjustable vanes
at the nozzle which compensates for possible draft condi-
tions.
NOTE: Air direction settings shown in Figures 7 & 8.
NOTE: Cold air will try to escape near top of doorway. Air flow
can be controlled by direction of nozzle louvers.
NOTE: Each unit is supplied with an air flow probing switch which
is located in each cabinet compartment and this is supplied with a
hose located in the suction side of the blower. A blower turning in
the wrong direction may be prevented from turning the heat on by
this switch.
MAINTENANCE
NOTE: Ball bearings are permanently lubricated and require no
further lubrication.
Cleaning:
1. The air curtain cabinet(s) may be wiped off with a damp
cloth. Do not allow motor to get wet. Do not use solvents or
harsh detergents.
NOTE: Keep air intake louvers clear of dirt and dust accumula-
tion which could affect performance.
2. Check blower wheels for accumulated dirt twice a year and
clean. If disassembly is required, see “General Servicing”
section.
GENERAL SERVICING
1. To remove motor/blower assembly, repeat steps 4, 5, 6 and 7
in “Unpacking” section.
2. Place motor/blower assembly on workbench.
3. To replace blower wheel, remove the three slotted hex head
screws on outer blower ring assembly (See Figure 10,
Replacement Parts Illustration). The wheel is held onto shaft
by two hex head screws.
4. To remove motor:
a. Remove blower wheels. (See Step 3 above).
b. Remove blower scroll (six hex head screws).
c. Unscrew and remove motor mounts.
5. To remove heater assembly:
a. Remove blower wheels. (See Step 3 above).
b. Remove heater assembly (two screws). Disconnect two
yellow wires and blue, black and red wires from heating con-
tactor. Pass wires through bushing as you pull out the
heater assembly.
6. To replace heater assembly: Do the reverse of Step 5 above.
NOTE: To re-assemble, repeat steps 4, 5 and 6 in installation
section for single cabinet units.
7. Replace motor/blower assembly.
! WARNING
ALL ELECTRICAL POWER MUST BE DISCONNECTED
WHEN INSTALLING OR SERVICING THIS EQUIPMENT.
MORE THAN ONE DISCONNECT
SWITCH MAY BE
REQUIRED TO REMOVE POWER FROM THE UNIT.
Figure 7 - Desired Air Flow Adjustment for Temperature
and Humidity Control.
Figure 8 - Desired Air Flow Adjustment for Insect
and Dust Control.
!
WARNING
IF SERVICE IS REQUIRED, IT SHOULD BE DONE BY QUAL-
IFIED PERSONS ONLY.
ALWAYS DISCONNECT POWER SUPPLY BEFORE SERVICING
IMPORTANT !
NOTE POSITION OF WHEELS TO PREVENT RUBBING WHEN
REPLACED.
Figure 9 - Main control box cover & cabinet compartment
cover shown open and with air intake grille removed.