BERNER DTU03 SERIES Commercial Drive Thru Unit 3 Air Curtains Instruction Manual
- June 15, 2024
- BERNER
Table of Contents
BERNER DTU03 SERIES Commercial Drive Thru Unit 3 Air Curtains
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK OR INJURY TO PERSONS, OBSERVE
THE FOLLOWING:
- Read all instructions before installing or using this air curtain.
- Use this unit only in the manner intended by the manufacturer and described in this manual. Any other use not recommended by the manufacturer may cause fire, electric shock, or injury to persons.
- If you have any questions, contact the manufacturer.
- Before servicing or cleaning the unit, switch the power off at the service panel and lock the service disconnecting means to prevent power from being switched on accidentally.
- When the service disconnecting means cannot be locked, securely fasten a prominent warning device, such as a tag, to the service panel.
- Installation work and electrical wiring must be done by a qualified person(s) by all applicable national and local codes having jurisdiction, including fire-rated construction.
- See page 4, ELECTRICAL CONNECTIONS (NEC Code ANSI/NFPA No. 70).
- When cutting or drilling into a wall or ceiling, do not damage electrical wiring and other hidden utilities.
- To reduce the risk of fire, do not store or use gasoline or other flammable vapours and liquids in the vicinity of the air curtain.
- This air curtain is hot when in use. To avoid burns, do not let bare skin touch hot surfaces.
- Keep combustible materials, such as furniture, pillows, bedding, papers, clothes, etc. and curtains at least 1 inch from the top, back, front, sides and at least 6 feet from the discharge of the air curtain.
- Extreme caution is necessary when any air curtain is used by or near children or invalids, and whenever the heater is left operating unattended.
- Do not operate any air curtain after it malfunctions. Disconnect power at the service panel and have the air curtain inspected by a reputable electrician before reusing it.
- To disconnect the air curtain, turn the controls to “off”, and turn off power to the air curtain circuit at the main disconnect panel.
- Do not insert or allow foreign objects to enter any ventilation or discharge opening as this may cause an electric shock fire, or damage the air curtain.
- To prevent a possible fire, do not block the air intake or discharge of the air curtain in any manner.
- The air curtain has hot and arcing or sparking parts inside. Do not use it in areas where gasoline, paint, or flammable vapours or liquids are used or stored.
- This heater may include an audible or visual alarm to warn that parts of the heater are getting excessively hot.
- If the alarm sounds (or illuminates), immediately turn the heater off and inspect for any objects on or adjacent to the heater that may have blocked the airflow or otherwise caused high temperatures to have occurred.
- DO NOT OPERATE THE HEATER WITH THE ALARM SOUNDING (OR ILLUMINATING).
UNCRATING
Carefully examine the carton(s) for damage before opening. If the carton is
damaged, immediately notify the shipping company. If the unit(s) were shipped
on wooden skids, remove protective wood and banding straps securing the
carton(s) to the skid. Open the carton(s) and remove all protective packaging.
Immediately verify that the electrical rating nameplate located on the cover
matches the electrical power supply available. Retain the shipping carton(s)
until the unit(s) is installed and properly operating.
ACCESSORIES
If the unit(s) was ordered with optional electrical accessories, the
accessories may be found in the carton containing the unit or in a separate
carton(s) accompanying the unit(s). Check all of the cartons/skids for
accessories before discarding them.
MOUNTING INSTRUCTIONS
(General Notes for All Mounting Configurations)
NOTE: Models with Electric Heat – INDOOR MOUNTING ONLY!
Environmental/Insect/Dust & Fume Control
The Drive-Thru Unit 3 air curtain is designed to be an effective barrier
against cold drafts in the winter and hot air in the summer. To achieve
optimum protection, the unit should be mounted on the inside of the building,
as close to the top of the window opening as possible. To ensure peak
performance, keep the air stream free of obstructions. The unit is equipped
with mounting brackets to ensure proper mounting in most applications.
The air curtain will not perform properly if negative air pressure exists in
the building. Under these conditions, a means for making air to the building
must be provided so that the air pressure on both sides of the opening is in
balance.
Before mounting the unit, check the supporting structure to verify that it has
sufficient load-carrying capacity to support the weight of the unit(s). The
mounting hardware should be capable of supporting a minimum of three (3) times
the weight of the unit (See Table 1).
TABLE 1
- When determining the mounting location for the unit(s), make sure that nothing interferes with the curtain of air developed when the discharge vanes are directed from 0º to 20º toward the drive-thru window opening. If the air stream strikes any obstruction (the top edge of the window, a window opening device, etc.), the effectiveness of the unit will be greatly reduced (See Drawing 1).
- For optimum performance, the bottom of the unit (discharge nozzle) should be no more than 1” above the top of the drive-thru window opening with the unit mounted flush to the wall. If the unit must be mounted higher, it must be spaced out from the wall 3/8” for every inch, the unit is above the drive-thru window opening.
- Electrically heated units shall:
- Have a minimum clearance of at least 1” between the sides and top of the unit and any combustible material.
- Have a minimum clearance of at least 18” between the bottom of the unit and the counter.
WALL MOUNTING
The Drive-Thru Unit 3 air curtain is shipped with a variety of wall mounting
options. Included in standard orders are standard brackets (See Figure 1) and
spanning legs (See Figure 2). Adjustable brackets (See Figure 3) are available
by special order.
FIGURE 1 – Standard Brackets
FIGURE 2 – Spanning Brackets (works with both standard and adjustable extension brackets)
FIGURE 3 – Adjustable Extension Brackets (optional, must be ordered separately by special order)
ELECTRICAL CONNECTIONS
All electrical wiring and connections MUST be performed by qualified personnel following the National Electrical Code ANSI/NFPA No. 70 (latest edition) or, in Canada, the Canadian Electrical Code, Part 1-C.S.A. Standard C22.1, and local codes and regulations. Check the rating nameplate on the top of the unit for supply voltage and current requirements (See Figure 2). Unheated units may be plugged into any 15 or 20-amp receptacle. Heated units require a dedicated 20 amp receptacle and circuit. A disconnect switch for each branch circuit is a required part of this installation. All field wiring must be copper with a minimum insulation of 60°C within the approved conduit. If any of the wires supplied with the unit must be replaced, it must be replaced with copper wiring with a minimum insulation of 90°C.
OPERATION INSTRUCTIONS
General Operation
- The unheated Drive-Thru Unit 3 air door operates with a two-position on-off switch.
- The heated Drive-Thru Unit 3 air door operates with a three-position fan-off-heat switch.
- Air Flow Adjustments With the air door operating and the door in its fully open position, check to see that nothing is obstructing the airflow at the discharge nozzle vanes.
- Find the air stream split location. Hold a handkerchief tissue, by its corners, approximately 4” above the counter.
- Gently move the handkerchief back and forth in the doorway. Make sure the air is being directed to both the inside and the outside. The split location is indicated where the handkerchief is vertical with minimal or no fluttering.
- Rotate the air curtain by adjusting its position in the mounting bracket so the split location is approximately 2” outside the window (See Drawing 1).
MAINTENANCE AND CLEANING
CAUTION: ELECTRIC SHOCK HAZARD
Disconnect power when servicing the unit. More than one disconnect may be
required to de-energize the unit. Keep your air curtain operating at peak
efficiency by cleaning the blower wheels, motor(s) and intake grille. The
build-up of dust on the blower wheels can cause vibration, noise and excessive
wear on the motor bearings. The frequency of cleaning will depend on the
environment where the unit is operating. Dirty, dusty or greasy environments
could require a cleaning schedule of once every two months. If the environment
is not that dirty, the unit(s) should be scheduled for cleaning a minimum of
once every (6) months.
To remove the filter
This unit is equipped with a “No Tool” filter removal. Simply, pull the (2)
black tabs, located underneath the intake grille, outward. This action
releases the filter which then can be pulled downward out of the unit (See
Figure 4).
To clean the interior of the unit
Disconnect the power to the unit; remove the intake grille by removing the (4)
screws on one side of the unit. Pull the top of the end cap outward to release
the filter tab to remove the end cap. Slide the intake grille out of the unit
(See Figure 5). It is not recommended to remove the blower assembly from the
cabinet. To clean the motor and blower wheels, with the filter and inlet
screen removed, blow compressed air in the unit to remove loose dust and
debris.
CAUTION
STAND CLEAR OF THE UNIT OR WEAR SAFETY GOGGLES AS LOOSE DEBRIS MAY BE PRESENT
AND MAY EXIT THE NOZZLE.
- Connect the power and switch the power on after cleaning.
SERVICE
CAUTION
ELECTRIC SHOCK HAZARD: Disconnect power when servicing the unit. More
than one disconnect may be required to de-energize the unit. Any service
performed on the Drive-Thru Unit 3 air curtain MUST be done by qualified
personnel. Berner air curtains require very little servicing. All parts are
easily accessible for periodic inspection and maintenance. Units should be
cleaned at least twice a year. Your particular application (the amount of dirt
and dust in the air) and the location of the unit(s) will determine how often
your unit(s) will need to be cleaned and serviced. All motors have permanently
lubricated, sealed, sleeve, or ball bearings and require no maintenance.
REPLACEMENT OF ELECTRIC HEATER ELEMENT
- Disconnect power to the unit.
- Remove the end cap and intake grille by removing the screws on one end of the unit and sliding the grille out.
- Remove and mark all wires from damaged elements.
- To remove a damaged element from the unit, slide it out through the front of the unit.
- Install new element and connect all wires.
- Reinstall the intake grille and end cap.
- Connect the power and turn the power on.
WARRANTY
Berner International (“The Company”) warrants all new equipment to be free of defects in workmanship and material for one year on unheated and heated models from the original date of shipment, provided the equipment has been properly cared for, installed and operated by the limits specified on the nameplate and The Company’s instructions. All warranted parts will be replaced at no charge for a period of six months from date the parts were shipped. The Company will correct by repair or replacement, at its option and expense, any proven defects in said apparatus, subject to the above conditions, provided that immediate written notice of such defects is given to The Company. The warranty does not include any labour incurred for the removal or installation of the defective part(s).
The Company reserves the right to inspect, or have inspected by a qualified representative, any apparatus at the place of installation before authorizing repair or replacement. Repair or replacement will be made F.O.B. factory with any applicable transportation charges to be borne by the customer. Merchandise not of The Company’s manufacture supplied in piece, or in component assemblies, is not covered by the above warranty, but The Company will give the customer the benefit of any adjustment as made with the Manufacturer.
This warranty is void if the apparatus has been tampered with in any way or
shows evidence of misuse. The Company will not assume any expense or liability
for repairs made outside its factory without proper written consent from its
service
manager nor for any transportation charges on apparatus returned to the
factory without written authorization by The Company. Nothing in the above
warranty provisions, however, shall impose any liability or obligation of any
type, nature or description upon Berner International if Berner has not
received payment in full for the apparatus in question.
THERE ARE NO WARRANTIES THAT EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF INCLUDING THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. LIMITATION OF DAMAGES Notwithstanding anything to the contrary above, the customer’s exclusive remedy for any losses or damages resulting from the sale of The Company’s equipment under this agreement, including but not limited to, any allegations of breach of warranty, breach of contract, negligence or strict liability, shall be limited, at The Company’s option, to either the return of the purchase price or the replacement of the particular equipment for which a claim is made and proved. In no event shall The Company be liable for any special, consequential, incidental or indirect losses or damages from the sale of The Company’s equipment under this agreement.
BERNER INTERNATIONAL
New Castle, Pennsylvania
724-658-3551
1-800-245-4455
www.Berner.com
Copyright 2022 Berner International MADE IN U.S.A.
Berner reserves the right to alter specifications without prior notice