Nortek B6EW Series - User Manual

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Vertical Wall Mount Air Handler

Please read all information in this manual thoroughly and become familiar with the capabilities

and use of your appliance before attempting to operate or maintain this unit. These instructions

are primarily intended to assist qualiﬁed individuals experienced in the proper installation of

this appliance. Some local codes require licensed installation/service personnel for this type

of equipment. Improper installation, service, adjustment, or maintenance may cause explosion,

ﬁre, electrical shock or other hazardous conditions which may result in personal injury or

property damage.

Unless otherwise noted in these instructions, only factory authorized kits or accessories may

be used with this product. Keep this manual where you have easy access to it in the future. If a

problem occurs, check the instructions and follow recommendations given. If these suggestions

don’t eliminate your problem, call your servicing contractor.

DO NOT DESTROY. PLEASE READ CAREFULLY AND

KEEP IN A SAFE PLACE FOR FUTURE REFERENCE.

IMPORTANT

B6EW Series

INSTALLATION INSTRUCTIONS

NOTE: Unit style may appear different depending on model.

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This document describes the B6EW Series Vertical Wall Mount Air Handler, a device designed for indoor heating and cooling applications.

Function Description

The B6EW Series Vertical Wall Mount Air Handler is a component of a heating, ventilation, and air conditioning (HVAC) system. Its primary function is to circulate air throughout a building, either for cooling (when paired with an outdoor air conditioning unit) or heating (using an integrated heating element). The unit is designed for vertical wall-mounted installation and is shipped with a nitrogen holding charge to maintain coil integrity. It features a multi-speed blower for adjustable airflow and can be configured for continuous low-speed fan operation.

Important Technical Specifications

The B6EW Series air handlers come in various models, including X18K, X24K, X25K, X30K, and X36K, which correspond to different capacities and physical dimensions.

Refrigerant Connections: All models use 3/4" suction diameter and 3/8" liquid diameter connections.
Supply Air Duct Dimensions:
- X18K, X24K, X25K, X30K models: 9 x 17 1/4 inches.
- X36K model: 15 x 17 1/4 inches.
Physical Dimensions (Approximate "A" and "B" measurements):
- X18K, X24K models: A = 36 3/8 inches, B = 9 1/2 inches.
- X25K, X30K models: A = 43 1/2 inches, B = 9 1/2 inches.
- X36K model: A = 43 1/2 inches, B = 15 1/2 inches.
Electrical: The unit requires 240/208 Volt operation. It includes a transformer (24V) and circuit breakers (60A). Electrical connections must comply with the National Electrical Code (NEC) ANSI/NFPA 70 in the US or the Canadian Electrical Code CSA C22.1 in Canada.
Refrigerant Type: The unit uses R-410A refrigerant.
Airflow Data: Airflow is shown in CFM, +/- 5%. External static pressure is shown in inches W.C. All airflow data is provided for both with and without a filter and with a dry coil. For filter, subtract .08" external static pressure. For wet coil, subtract .1" external static pressure.
Minimum Circuit Ampacity & Maximum Overcurrent Protection (MCA/MOP): These values vary by model and total kW, ranging from 29.8 to 54.8 MCA and 30 to 60 MOP.
Heating Elements: The unit can be equipped with heating elements of various kW ratings (e.g., 5 kW, 8 kW, 10 kW).

Usage Features

Thermostat Control: The unit is controlled by a thermostat with modes for OFF, ON (continuous blower), AUTO (blower cycles with heating/cooling), COOL, and HEAT.
Blower Speed Configuration: The blower speed is factory preset but can be adjusted using DIP switches on the control board to optimize system performance and comfort. There are five speed motor terminals (M1-M5) corresponding to different airflow rates (Low, Medium Low, Medium, Medium Hi, Hi speed).
Continuous Low Speed Fan Operation: The air handler supports continuous low-speed fan operation. When the "G" terminal is energized without "Y/Y2", the unit operates at the cooling speed. If "G" and "Y/Y2" or "Y/Y2" are energized, it operates at the selected cooling speed with a 40-second blower-off delay.
Installation Flexibility: The unit can be mounted vertically on a wall or recessed between framing studs. It is designed for indoor installations only.
Condensate Drainage: The unit includes primary and secondary drain connections for proper condensate removal. It is crucial to ensure proper drainage to prevent water damage.

Maintenance Features

Filter Replacement: The unit requires regular filter replacement. Filter sizes vary by model (e.g., 16" x 20" x 1", 20" x 20" x 1", 24" x 20" x 1"). Dirty or clogged filters can lead to excessive loads on the motor and reduced performance.
Coil Cleaning: The evaporator coil should be inspected and cleaned periodically to maintain efficiency.
Drain Pan and Tubes Maintenance: Regular inspection and cleaning of the drain pan and tubes are necessary to prevent blockages and ensure proper condensate drainage.
Electrical Connections Check: Periodically, electrical connections should be checked for tightness and corrosion.
Blower Motor and Assembly Inspection: The blower wheel, motor, and assembly should be inspected for dirt, lint, and proper lubrication.
Refrigerant Charge: If repairs necessitate evacuation and charging, it must be performed by qualified, trained personnel. The unit is shipped with a nitrogen holding charge that must be purged before evacuation and charging with R-410A refrigerant.
Troubleshooting: The manual provides a troubleshooting guide for common issues, including the blower not turning on, the unit not operating, and the circuit breaker being tripped. It also includes a table for control board fault conditions indicated by LED (AN2) status.