Qmark Environmental Electric Heated - Manual (Page 5)

5
7. Replace intake grille with louvers facing down and fasten
knurled nuts.
Field Power Wiring: Refer to Wiring Diagram and
Nameplate.
1. Before wiring be sure that available power supply, voltage,
phase and frequency corresponds to that specified on unit rat-
ing plate. In addition, make certain that service capacity is suf-
ficient to handle load imposed by the heated air curtain.
2. Install all wiring, protection and grounding in accordance with
the National Electrical Code (NEC) and all local requirements.
3. Run proper size copper power supply conductors from the field
power supply disconnecting means (supplied by others) with
insulation rated 75 degrees C minimum (167º F) to the power
supply blocks provided at the Main Control Box of the air cur-
tain. This field supplied disconnecting means shall be provided
to disconnect the heater, motor controller(s) and any supple-
mentary overcurrent protective devices from all ungrounded
conductors. This disconnecting means shall be within sight of
the heater, motor controller(s) or supplementary protective
devices. If it is not within sight or is located greater than 50
feet, disconnecting means shall be capable of being locked in
the open position.
4. The heater control box must have an unbroken electrical
ground from its Main Control Box to its field supplied discon-
necting means to minimize personal injury in case an electrical
fault should occur.
5. Always refer to nameplate data and wiring diagram located on
the inside of the hinged cover of the main control box for
important information and other data before proceeding with
wiring of the unit.
NOTE: This heated air curtain is equipped with a step-down
transformer 24V control circuit. Any standard 24V heating ther-
mostat with or without fan control may be used. Door switches
may be used to control the operation of the unit. A door switch
may be connected to control the operation of the fan only or it
can be connected in parallel with the heating thermostat to call
for fan and heat every time the door is opened. The thermostat
may call for fan and heat even when door is closed. The step
down transformer is a 75 VA approved Class 2 transformer and a
control knockout is provided with the control terminal blocks
spaced away from power wire to allow Class 2 wiring for controls
but it is recommended to use Class 1 wiring, especially to door
switches to protect it from physical damage in an industrial or
commercial environment.
6. Replace hinged cover of the main control box.
7. Unit is ready for operation.
8. Restore power to the unit. Call for heat through the thermostat
or through the door switch if supplied. Unit should run. Check
for correct air flow.
9. Inspect unit for excessive vibration during operation. If exces-
sive vibration is noticeable, disconnect power supply. Inspect
mounting installation and refer to “Trouble Shooting Chart”,
page 7 for probable cause.
Field Control Wiring: Refer to Wiring Diagram, pages
8-10.
FOR INSTALLATION OF MULTIPLE CABINET AIR
CURTAINS
For 2 Cabinet Units: 72”, 84” and 96” See Figure 5
NOTE: All installation should be done to meet local building codes.
1. Using template provided, determine mounting location
for Cabinet A (left side), left of centerline.
2. Drill holes and attach mounting hardware (not included)
for Cabinet A.
3. Mount Cabinet A on wall and securely tighten hard-
ware.
4. Repeat steps 1,2 and 3 for mounting Cabinet B (right
side), right of centerline.
5. Secure Cabinet A to Cabinet B using parts provided in
installation kit. After alignment of cabinets is complet-
ed, carefully secure all assembly mounting hardware.
6. Install motor/blower assembly in Cabinet A. Pass pres-
sure switch hose through proper hole on blower base.
Attach hose to right blower. Secure two wing nuts on
blower base. Reconnect motor (A) electric cord plug
assembly.
7. Install motor/blower assembly (B) in Cabinet B. Pass
pressure switch hose through proper hole on blower base.
Attach hose to right blower. Secure two wing nuts on blower
base. Reconnect motor (B) electric cord plug assembly.
8. Replace intake grilles with louvers facing down and refasten
knurled nuts.
9. Refer to “Field Power Wiring” and “Field Control Wiring” sec-
tions for single cabinet installation in this manual. All
instructions and safety warnings and notes also apply to
electrical connections of multiple cabinets. Additional steps
are necessary only for harness connections of Cabinet A to
Cabinet B and/or to the Main Control Box.
10. Refer to wiring diagram on the inside of the hinged cover of
the Main Control Box and to applicable wiring diagrams in this
manual. Harness wires are provided with the right ends of
the harness wires already connected to the unit and the
installer has to connect the left ends of the harness wires to
the correct terminal points as shown in the diagram. The
Cabinet wiring compartment covers will have to be opened.
These covers are also hinged to the cabinets. Route and
locate wiring and wire strap the wires as shown in Figure 9,
page 7 and allow for the movement of the wires as the covers
are opened and closed.
11. Replace all hinged covers.
12. Unit is ready for operation.
13. Restore power to the unit. Call for heat through the thermo-
stat or through the door switch if supplied. Unit should run.
Check for correct air flow.
14. Inspect unit for excessive vibration during operation. If
excessive vibration is noticeable, disconnect power supply.
Inspect mounting installation and refer to “Trouble Shooting
Chart”, page 7 for probable cause.
!
WARNING
THE MOTORS OF THIS HEATED AIR CURTAIN HAVE AN
INTERNAL SELF RESETTING THERMAL OVERLOAD PRO-
TECTOR. ALWAYS DISCONNECT FROM POWER SUPPLY
BEFORE SERVICING.
CAUTION
!
THE HARDWARE AND THE SUPPORTING STRUCTURE MUST
BE CAPABLE OF SUPPORTING A MINIMUM 300 LB LOAD.
Cabinet A
Cabinet B
!
WARNING
ALL HEATED AIR CURTAINS SHOULD BE INSTALLED BY
QUALIFIED PERSONNEL.
Figure 5