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Explains hazard levels used in manuals and on product labels.
Explains the usage of signal words within the manual text.
Describes how signal words are used on product labels.
Critical warning regarding clearances from combustible materials when heaters are installed.
Guidance on selecting the optimal installation site for the unit.
Specific instructions for installing the unit in a downflow configuration.
Procedures for installing the unit in a closet environment.
Instructions for positioning the unit for horizontal airflow.
Guidelines for connecting the supply duct to the unit's outlet.
Instructions for attaching the return duct to the unit's bottom.
Requirements for installing field-supplied air filters.
Requirements for providing overcurrent protection for the power supply wiring.
Step-by-step guide to installing the accessory No Heat Kit.
Procedures for making line voltage wiring connections to the unit.
Instructions for establishing a proper ground connection for safety.
How to adjust the blower motor speed by changing wiring connections.
Guidance on setting the thermostat's heat anticipator value.
Explanation of how electric heater elements are staged for operation.
Steps to measure external static pressure for airflow assessment.
Procedure to measure temperature difference between supply and return air.
Guidance on cleaning and inspecting system filters for efficiency.
Information regarding the permanent lubrication of blower motor bearings.
Checking condensate drain lines during the cooling season for proper flow.
Fan operates continuously regardless of heating or cooling calls.
Controls heat stages based on thermostat demand.
Controls cooling operation for cooling/heat pump units.
Controls the defrost cycle for heat pump operation.
Controls the emergency heat mode for heat pumps.
How the temperature limit responds to over-temperature conditions in the duct.
Explains hazard levels used in manuals and on product labels.
Explains the usage of signal words within the manual text.
Describes how signal words are used on product labels.
Critical warning regarding clearances from combustible materials when heaters are installed.
Guidance on selecting the optimal installation site for the unit.
Specific instructions for installing the unit in a downflow configuration.
Procedures for installing the unit in a closet environment.
Instructions for positioning the unit for horizontal airflow.
Guidelines for connecting the supply duct to the unit's outlet.
Instructions for attaching the return duct to the unit's bottom.
Requirements for installing field-supplied air filters.
Requirements for providing overcurrent protection for the power supply wiring.
Step-by-step guide to installing the accessory No Heat Kit.
Procedures for making line voltage wiring connections to the unit.
Instructions for establishing a proper ground connection for safety.
How to adjust the blower motor speed by changing wiring connections.
Guidance on setting the thermostat's heat anticipator value.
Explanation of how electric heater elements are staged for operation.
Steps to measure external static pressure for airflow assessment.
Procedure to measure temperature difference between supply and return air.
Guidance on cleaning and inspecting system filters for efficiency.
Information regarding the permanent lubrication of blower motor bearings.
Checking condensate drain lines during the cooling season for proper flow.
Fan operates continuously regardless of heating or cooling calls.
Controls heat stages based on thermostat demand.
Controls cooling operation for cooling/heat pump units.
Controls the defrost cycle for heat pump operation.
Controls the emergency heat mode for heat pumps.
How the temperature limit responds to over-temperature conditions in the duct.
This document describes the installation, operation, and maintenance of a Modular Blower, also referred to as an Electric Furnace, designed for use with or without electric heat. The blower cabinet is compatible with cooling or heat pump operations and can be installed in upflow, downflow, or horizontal positions.
The Modular Blower serves as the indoor air handler for heating and cooling systems. When equipped with an accessory No Heat Kit, it functions as a cooling or heat pump air handler without electric heat. When electric heaters are installed, it provides electric heating in addition to air circulation for cooling or heat pump operation. The unit circulates air through the indoor coil and ductwork, ensuring proper airflow for the system.
Models and Compatibility: The manual covers models MF08B1500A, MF12F1900A, MF16J2200A, and MF20N2600A, all compatible with the AMF001NHA Accessory No Heat Kit. The unit is designed to use ONLY factory-listed electric heaters.
Dimensions and Clearances (Figure 1):
Electrical Specifications (Figure 6): The unit operates on 208V or 240V, single phase, 60 Hz.
Airflow Performance (Page 8): Airflow is measured in CFM (Cubic Feet per Minute) at various static pressures (SP IN, WG) and voltage settings (230V/208V) for different fan speed taps (LOW, MED, HIGH).
Installation Flexibility (Figure 3, 4):
Electrical Connections (Figure 6):
No Heat Kit Installation (Figure 6): If electric heat is not used, the accessory No Heat Kit must be installed. This involves attaching adapter and filler plates to a bracket and securing the kit with screws, then connecting its plug to the receptacle on the control board.
Motor Speed Adjustment: The blower motor comes factory-wired for medium or high speed. Speed can be changed by disconnecting the black wire at the blower motor terminal block and reconnecting to the desired speed tap.
Electric Heater Staging (Figure 8): Heater elements are turned on in increments. For heaters larger than 5KW, heat can be staged (1st & 2nd) via an indoor or outdoor thermostat. A 24V control signal from W1 on the indoor thermostat energizes the 1st stage, and W2 energizes the 2nd stage. W1 and W2 can be jumpered for simultaneous staging.
Sequence of Operation (Page 9): The manual details the control logic for various modes:
Limit Operation: The temperature limit responds to over-temperature conditions. If tripped, heater relays de-energize, and the fan relay energizes. Multiple trips can lead to soft or hard lockout, which disables heater relays. Power cycling clears the lockout.
Filters:
Lubrication: The bearings of the blower motor are permanently lubricated, requiring no field lubrication.
Condensate Drains:
Air Flow Check (Figure 9):
Temperature Rise Check:
General
