Stelpro MUAA Series Make Up Air Installation Guide

Important Safety Information

WARNING: Before installing and operating this product, read, understand, and follow all instructions. Keep these instructions for future reference. Failure to do so may void the warranty and relieve the manufacturer of responsibility. This product must be installed by a qualified person and connected by a certified electrician according to local electrical and building codes. Always switch off power at the circuit breaker/fuse before installing, repairing, or cleaning the unit. Ensure the unit is properly grounded. Never block air vents, as this can cause overheating and fire hazards. Do not insert foreign objects into air vents. This unit contains hot and arcing parts and should not be used or stored in wet areas or areas with flammable liquids or combustible materials. If the unit's thermal protection activates repeatedly, have it inspected by a qualified electrician or certified repair center. Label all wires before disconnecting during servicing to prevent wiring errors.

List of Models

XX: Collar diameter

YY: Power in kilowatt (01 = 1.5 kW | 04 = 4.5 kW)

ZZ: Voltage (11 = 120 V-1 P | 83 = 208V-3P | 21 = 240/208V-1P | 31 = 347V-1P | 53 = 480V-3P | 63 = 600V-3P)

(M): Motorized feature available for 6" models with 120V & 240/208V-1P voltage.

6*: Models with a neutral terminal (three-wire connection).

Available options: Disconnect Switch and Plenum Kit.

Mechanical Installation

Installing the Device

The unit is designed for horizontal positioning for all models and vertical positioning for air upflow or downflow on 6" to 10" models. Securely attach the device to a solid support or mount from the ceiling using studs. Diagrams illustrate installation steps for MUAA06 120V-1P & 240/208V-1P Models and Other Models.

Choosing an Appropriate Location

• Ideally in a service room with temperatures between 10°C and 40°C.
• Close to an exterior wall to minimize insulated duct length.
• Away from electrical panels and fire hazards.
• Ensure easy access for maintenance; maintain a minimum clearance of 24 inches from the main entrance door.
• Maintain a minimum space of 1½ inches above the device.

Installing the Duct System

• Plan the simplest duct system with minimal elbows and joints.
• Keep insulated duct length minimal to prevent airflow restriction and improve ventilation.
• Do not install elbows less than twice the diameter of the device's duct.
• Use only rigid metal ducts.
• Insulate only the inlet ducts.
• Screw ducts as close as possible to the device to avoid blocking the backdraft damper.

Electrical Installation

Power Connection

Pierce a hole to pass the wire through. For models with a plenum kit, drill the box at the desired location. Connect the device to a 240V electrical power supply source as illustrated. Diagrams show connections for MUAA06 120V-1P & 240/208V-1P Models and Other Models.

Connecting the Low Power Control

For 6" 120V-1P and 240/208V-1P models, connect to a main wall control. Use #22 AWG wires for connections. For other models, a current switch is included as an interlock between the unit and the exhaust fan. Connect the current switch to the unit's terminal block. For the 6" 120V-1P & 240/208V-1P model, an auxiliary contact (external switch) can be connected to the terminal block to start the exhaust fan simultaneously. Diagrams illustrate these connections.

Electronic Control & Operation Modes

Operation Modes

• ON MODE: The fan runs at the set speed. An orange indicator shows heating elements are operating. A green indicator blinks every second.
• INT MODE: The unit operates intermittently (15 minutes on, 45 minutes off per hour). An orange indicator shows heating elements are operating. A green indicator blinks every 4 seconds.
• STOP: The device is in stop mode. A green indicator shows the device's power is on.

Plenum Temperature Control Potentiometer

The make-up air unit is equipped with a plenum temperature sensor. The plenum temperature set point can be adjusted using a potentiometer on the control card. The default set point is 20°C (68°F). The adjustable range is 0°C (32°F) to 40°C (104°F). A diagram shows the potentiometer and its adjustment scale.

Performance Curve

A graph displays the performance curves for MUAA06, MUAA08, MUAA10, and MUAA12 models, showing the relationship between Flow (CFM) and Static Pressure (poH2O).

Maintenance

Minimal maintenance is required. Clean the exterior hood of the fresh air intake annually. Clean the air filter every four months using mild soap and warm water, and dry it thoroughly before reinstallation. Always disconnect power before cleaning. Dust the device regularly to prevent overheating. Use a vacuum cleaner with a dust brush attachment for cleaning. Control compartments of units with plenum kits are dust-protected, but the rest of the unit still requires maintenance.

Troubleshooting

Limited Warranty

This limited warranty is offered by Stelpro Design Inc. for Stelpro MUAA models. It covers defects in workmanship and/or materials for 3 years (5 years for elements) from the date of purchase. This warranty applies only to the original purchaser and is non-transferable.

Claim Procedure

If the unit becomes defective, cut off power and contact your installer, distributor, or Stelpro's customer service. Provide a copy of the invoice and product nameplate information. Stelpro may require examination of the product. Repairs must be authorized in writing by Stelpro and performed by authorized personnel. Obtain an RMA number from Stelpro customer service before returning any product. The RMA number must be clearly written on the parcel.

Conditions, Exclusions and Disclaimer of Liability

This warranty is exclusive and in lieu of all other warranties. Stelpro disclaims any implied warranty of merchantability or fitness for a particular purpose. Stelpro's liability is limited to repair, replacement, or refund of the purchase price. Stelpro is not liable for property or personal injury damages, penalties, special or punitive damages, lost profits, loss of use, cost of capital, cost of substitute products, or any consequential, incidental, or contingent damages. This warranty does not cover damages from faulty installation, improper storage, abusive use, lack of maintenance, natural disasters, overvoltage, flooding, water damage, negligence, or damage incurred during shipping. Alterations to the product or removal/modification of the nameplate void the warranty. Scratches, dents, corrosion, or discoloration caused by heat, chemicals, or abrasives are not covered. Some states/provinces may not allow limitations on implied warranties or consequential damages.