Please read this manual carefully before installation and keep it for future reference. Installation Manual Signature Series MMBV*E Modular Blower Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.
Signature Series Modular Blower INSTALLATION INSTRUCTIONS This manual must be left with the homeowner for future reference. This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death. Table of Contents WARNING Improper installation, adjustment, service, or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional agency. WARNING Installation ...............
These electric furnaces are completely factory assembled and all components are performance tested. Each unit consists of a blower assembly, optional refrigerant coil, Installation This modular blower is designed for ease of installation applications. The units are shipped from the factory completely assembled. Accessories may also be ordered Knockouts are provided for electrical power wiring entrance. installations only.
Maintain all required clearances to combustible surfaces as stated on the unit rating plate. Supply and return ductwork must be adequately sized to meet the system’s air requirements and static pressure capabilities. Ductwork should be insulated with a minimum of 1” thick insulation with a vapor barrier in conditioned areas or 2” minimum in unconditioned areas. Connect opening provided around the blower outlet and should be installed as recommended in ASHRAE or ACCA Manual D.
Condensate Drain Connection Do not operate unit without a drain trap. The condensate drain is on the negative pressure side of the blower; therefore, air being pulled through the condensate line will prevent positive drainage without a proper trap. from inside any threaded drain pan hole to which a drain line is to be connected. Use care when removing the web so as to not damage the coil. • Auxiliary drain (if used) should be run to a place where it would be noticeable if it becomes operational.
Electrical Wiring IMPORTANT The variable speed motor in the modular blower WARNING Turn off electric power at the fuse box or service panel before making any electrical connections and ensure a proper ground connection is made before connecting line voltage. Failure to do so can result in property damage, personal injury, or death. influx of current when power is applied. Power is to remain applied to the motor except during servicing.
Setup coil should be between 350 – 450 CFM per ton of cooling outdoor unit. If the electric furnace is to be used with smaller tonnage outdoor equipment, the variable speed changing the motor control board (refer to Table 2. Variable Speed Motor Application). IMPORTANT The cooling blower speed must be set to provide a outdoor cooling capacity. Variable Speed Motor Locate the motor control board in the blower control box.
Control Board Taps Thermostat Model Mode HUM EM W1 O Cool Y2/ Y1 G A B Heat C D A CFM Cont. Blower Cooling X ** X MMBV08BE Heating Aux. Heat X Emer. Heat X MMBV12BE Heating Aux. Heat X Emer.
Heating (heat pump) Sequence of Operation When the thermostat calls for heat, the circuits between R and Y and R and G are completed. Circuit R-Y energizes the contactor starting the outdoor fan motor and the compressor. Circuit R and G energizes the blower relay starting the indoor blower motor. Cooling (cooling only or heat pump) Single Stage Cooling For single stage cooling, Y1 and Y2 need to be jumpered.
System Check coil should be between 350 – 450 CFM per ton of cooling Pre-start Check • Is unit properly located, level, secure, and serviceable? • Has an auxiliary pan been provided under the unit ceiling? outdoor unit. If the electric furnace is to be used with smaller tonnage outdoor equipment, the variable speed changing the motor control board (refer to Table 2. Variable Speed Motor Application).
Replacement Parts Maintenance Use only original equipment service parts when repairing these products. These parts include but are not limited to: circuit breakers, heater controls, heater limit controls, heater elements, motor, blower relay, control transformer, blower wheel, indoor coil, and sheet metal parts. When ordering replacement parts, it is necessary to order by part number and include with the order the complete model number and serial number (see unit data plate).
Counterflow Upflow Left to Right Airflow Right to Left Airflow Horizontal Figure 3. Page 11 mrcool.
Figure 4. Wiring Diagram for Variable Speed Blower mrcool.
Heat Pump with Electric Heat Only for 2-Stage Electric Heat Thermostat Electric Furnace R R C1 C1 W2 EM W1 W1 O O Y2 Y2 Y1 Y1 G G Heat Pump R C W O Y/Y2 2-Stage System only; for single-stage systems, jumper Y1 to Y2 Y1 Air Conditioning with or without Electric Heat Thermostat Electric Furnace R R Connect O to R for proper cooling blower delay Air Condensing Unit O C C1 2nd Stage Electric Heat if used W2 EM 1st Stage Electric Heat if used W1 W1 Y2 Y2 Y1 Y1 G G C Y/
Please read this manual carefully before installation and keep it for future reference. Signature Series Consult with the sales agency or manufacturer for details.
