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Defines hazard levels (Danger, Warning, Caution) for user safety.
Explains the usage of signal words WARNING and CAUTION in the manual.
Describes signal words on product labels, including colors and pictures.
Highlights critical safety warnings for installation and electrical work.
Guidance on choosing the optimal installation location, considering support and access.
Covers securing coil to blower cabinet and general positioning.
Details for upflow, downflow, and horizontal airflow positions.
Specifics for downflow installations and non-ducted closet setups.
Requirements for horizontal installations, including auxiliary drain pans.
Steps for suspending the cabinet using strapping or threaded rod.
Instructions for connecting supply and return ductwork to the unit.
Details on supplying and installing external filters and grilles.
Critical safety warnings regarding electrical shock and proper grounding.
Mandatory requirements for overcurrent protection (fuses/breakers).
Step-by-step guide for installing the accessory No Heat Kit.
Detailed instructions for connecting line voltage and ensuring proper grounding.
Provides typical low voltage wiring schematics for various system configurations.
Instructions for changing the blower motor speed settings.
Guidance on setting the thermostat's heat anticipator.
Details on how electric heater elements are staged for operation.
Steps to measure and adjust external static pressure for optimal airflow.
Procedure to measure and verify the temperature rise across the unit.
Guidance on filter cleaning, checking motor lubrication, and drain lines.
Table showing airflow (CFM) for MF08 model based on voltage and static pressure.
Table showing airflow (CFM) for MF12 model based on voltage and static pressure.
Table showing airflow (CFM) for MF16 model based on voltage and static pressure.
Table showing airflow (CFM) for MF20 model based on voltage and static pressure.
Describes operational sequences for electric heat-only modes.
Sequences for cooling-only units that also use electric heat.
Sequences for heat pump units with supplemental electric heat.
Explains how temperature limits and lockout conditions affect operation.
Wiring diagram for the base unit with the No-Heat Kit.
Wiring diagrams for various electric heater capacities (20kW to 30kW).
Lists key components, their part numbers, and quantities for each model.
Defines hazard levels (Danger, Warning, Caution) for user safety.
Explains the usage of signal words WARNING and CAUTION in the manual.
Describes signal words on product labels, including colors and pictures.
Highlights critical safety warnings for installation and electrical work.
Guidance on choosing the optimal installation location, considering support and access.
Covers securing coil to blower cabinet and general positioning.
Details for upflow, downflow, and horizontal airflow positions.
Specifics for downflow installations and non-ducted closet setups.
Requirements for horizontal installations, including auxiliary drain pans.
Steps for suspending the cabinet using strapping or threaded rod.
Instructions for connecting supply and return ductwork to the unit.
Details on supplying and installing external filters and grilles.
Critical safety warnings regarding electrical shock and proper grounding.
Mandatory requirements for overcurrent protection (fuses/breakers).
Step-by-step guide for installing the accessory No Heat Kit.
Detailed instructions for connecting line voltage and ensuring proper grounding.
Provides typical low voltage wiring schematics for various system configurations.
Instructions for changing the blower motor speed settings.
Guidance on setting the thermostat's heat anticipator.
Details on how electric heater elements are staged for operation.
Steps to measure and adjust external static pressure for optimal airflow.
Procedure to measure and verify the temperature rise across the unit.
Guidance on filter cleaning, checking motor lubrication, and drain lines.
Table showing airflow (CFM) for MF08 model based on voltage and static pressure.
Table showing airflow (CFM) for MF12 model based on voltage and static pressure.
Table showing airflow (CFM) for MF16 model based on voltage and static pressure.
Table showing airflow (CFM) for MF20 model based on voltage and static pressure.
Describes operational sequences for electric heat-only modes.
Sequences for cooling-only units that also use electric heat.
Sequences for heat pump units with supplemental electric heat.
Explains how temperature limits and lockout conditions affect operation.
Wiring diagram for the base unit with the No-Heat Kit.
Wiring diagrams for various electric heater capacities (20kW to 30kW).
Lists key components, their part numbers, and quantities for each model.
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
