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iMPortant SaFetY inForMation

Please read all information in this manual thoroughly 
and become familiar with the capabilities and use of this 
appliance before attempting to service or maintain this unit.

Safety markings are used frequently throughout this 
manual to designate a degree or level of seriousness and 
should not be ignored. WarninG indicates a potentially 
hazardous situation that if not avoided, could result in 
personal injury or death. caution indicates a potentially 
hazardous situation that if not avoided, may result in minor 
or moderate injury or property damage.

 WarninG:

electrical SHocK, Fire or eXPloSion 
HaZard

Failure to follow safety warnings exactly could 
result in serious injury or property damage.

improper servicing could result in dangerous 
operation, serious injury, death or property 
damage.

•  Before servicing, disconnect all electrical power 

to the air handler.

•  When servicing controls, label all wires prior 

to disconnecting. reconnect wires correctly.

•  Verify proper operation after servicing.

 WarninG:

the information listed below must be followed 
during the installation, service, and operation 
of this unit. unqualified individuals should 
not attempt to interpret these instructions or 
install this equipment. if you do not posses 
mechanical skills or tools, call your local 
dealer for assistance. Failure to follow safety 
recommendations could result in possible 
damage to the equipment, serious personal 
injury or death.

 WarninG:

ProPoSition 65 WarninG: this product 
contains chemicals known to the state of 
california to cause cancer, birth defects or 
other reproductive harm.

•  To minimize equipment failure or personal injury, it is 

essential that only qualified individuals install, service, or 
maintain this equipment. If you do not posses mechanical 
skills or tools, call your local dealer for assistance.

•  Follow  all  precautions  in  the  literature,  on  tags,  and 

on labels provided with the equipment. Read and 

thoroughly understand the instructions provided with 
the equipment prior to performing the installation and 
operational checkout of the equipment.

•  Use caution when handling this appliance or removing 

components. Personal injury can occur from sharp metal 
edges present in all sheet metal constructed equipment.

•  Do not store any of the following on, or in contact with, 

the unit: Rags, brooms, vacuum cleaners, or other 
cleaning tools, spray or aerosol cans, soap powders, 
bleaches, waxes, cleaning compounds, plastics or 
plastic containers, paper bags or other paper products, 
gasoline, kerosene, cigarette lighter fluid, dry cleaning 
fluids, paint thinners, or other volatile fluids.

•  Installation of equipment may require brazing operations. 

Installer must comply with safety codes and wear 
appropriate safety equipment (safety glasses, work 
gloves, fire extinguisher, etc.) when performing brazing 
operations.

•  Unless otherwise noted in these instructions, only factory 

authorized kits or accessories may be used with this 
product.

•  The installer should become familiar with the units wiring 

diagram before making any electrical connections to the 
unit. See the unit wiring label or Figures 14 - 16 (pages 
24 - 26).

•  Always  reinstall  the  doors  on  the  air  handler  after 

servicing or cleaning/changing the filters. Do not operate 
the air handler without all doors and covers in place.

General inForMation

requirements & codes

•  The  installer  must  comply  with  all  local  codes  and 

regulations which govern the installation of this type 
of equipment. Local codes and regulations take 
precedence over any recommendations contained in 
these instructions. Consult local building codes for 
special installation requirements.

•  All electrical wiring must be completed in accordance 

with local, state and national codes and regulations 
and with the National Electric Code (ANSI/NFPA 70) 
or in Canada the Canadian Electric Code Part 1 CSA 
C.22.1.

•  Install  this  unit  only  in  a  location  and  position  as 

specified on page 4. This unit is designed only for Indoor 
installations and should be located with consideration 
of minimizing the length of the supply and return ducts. 
See Tables 4 - 8 (pages 16 - 19) and the rating plate for 
proper circulating airflow data.

•  This  air  handler  may  be  used  for  temporary  heating 

of buildings or structures under construction. See the 
guidelines listed on page 4.

about the air Handler
This appliance has been tested for capacity and efficiency 
in accordance with AHRI Standards and will provide 
many years of safe and dependable comfort, providing 
it is properly installed and maintained. Abuse, improper 
use, and/or improper maintenance can shorten the life of 
the appliance and create unsafe hazards. Please read all 
instructions before installing the unit.

Summary of Contents for MB7BM Series

Page 1: ...nt role as well Pay attention to all safety warnings and any other special notes highlighted in the manual Improper installation of the furnace or failure to follow safety warnings could result in ser...

Page 2: ...ing 11 Turning the Blower Off 11 Blower Configurations 11 Selecting minimum Electric Heat Airflow 11 Determining Nominal System Capacity 11 3 speed Units 11 High Efficiency Units 12 Selecting Basic He...

Page 3: ...ment Do not store any of the following on or in contact with the unit Rags brooms vacuum cleaners or other cleaning tools spray or aerosol cans soap powders bleaches waxes cleaning compounds plastics...

Page 4: ...dbesetintopositionbeforerouting the refrigerant tubing Operation of an Air Handler During Construction CAUTION Failure to follow these instructions will void the factory warranty and may significantly...

Page 5: ...tments must be constructed and installed in accordance with NFPA and SMACNA construction standards Consult with local codes for special requirements For best sound performance be sure to install all t...

Page 6: ...nts air handler INSTALLATION The MB7 Series air handler is shipped ready for vertical upflow installation and is approved for attic basement alcove closetorcrawlspaceinstallationwithzeroclearance to c...

Page 7: ...ne gasket tape to the top of the air handler NOTE The blowers flanged surface is now beneath the air handler and will connect with the supply air duct 4 Carefully place the cased coil on top of the mo...

Page 8: ...ion of the unit in a suspended horizontal application is shown in Figure 5 When mating the blower and coil for horizontal left or right applications reference the upflow instructions on page 6 Make su...

Page 9: ...gures 14 16 Use only copper wire for the line voltage power supply to this unit Use proper code agency listed conduit and a conduit connector for connecting the supply wires to the unit Aluminum suppl...

Page 10: ...erkitforyour unit by referring to the list below or the units rating label A Size Cabinet 15Kw max B Size Cabinet 20Kw max C Size Cabinet 20Kw max 1 Connect the 2 wire plug of the air handler to the m...

Page 11: ...Disconnect all electrical power to the unit and remove the upper door 2 Remove the black and red wires from the blower motor jumping terminal Discard the blower motor jumping terminal Startup Adjustme...

Page 12: ...ch nominal system capacity When operating in the heat pump mode a higher basic airflow setting will increase the energy efficiency and capacitybutwillalsodecreasethesupplyairtemperature For maximum ca...

Page 13: ...eate excessive loads on the motor resulting in higher than normal operating temperatures and shortened service life It is recommended that the blower compartment be cleaned of dirt or lint that may ha...

Page 14: ...mension B Dimension C A 12 3 4 24 3 4 14 1 4 B 12 3 4 24 3 4 17 1 2 C 18 1 4 27 1 2 21 B A 12 7 8 3 4 TYP 1 3 4 1 7 8 K O 3 1 4 1 1 4 C 22 1 1 7 8 3 1 2 5 1 2 2 5 8 1 1 8 K O TYP 1 1 4 2 7 8 TOP VIEW...

Page 15: ...ount Kit Blower Motor Blower Wheel Blower Housing Transformer Control Board Coil Assembly Outlet Heater Box Lower Front Bracket Blower Door Motor Control Board Rear Bracket Front Joining Bracket Figur...

Page 16: ...0 845 780 705 610 530 Corrected ESP1 0 08 0 19 0 31 0 42 0 54 0 65 0 76 Med 1335 1290 1235 1175 1100 1015 925 805 Corrected ESP1 0 10 0 22 0 34 0 46 0 59 0 71 High 1470 1425 1360 1300 1225 1135 1050 9...

Page 17: ...685 0 1 1 0 1095 1040 995 950 900 850 805 750 1 1 1 0 1155 1105 1060 1010 965 920 870 825 0 0 0 1 1230 1185 1140 1090 1045 1010 965 920 1 0 0 1 1285 1260 1210 1165 1125 1080 1040 1010 0 1 0 1 1330 12...

Page 18: ...0 1 0 650 0 0 1 1 2 TON 1300 0 0 1 1 4 TON 700 0 1 0 0 1350 0 1 0 0 750 0 1 0 1 1400 0 1 0 1 800 0 1 1 0 2 5 TON 1450 0 1 1 0 850 0 1 1 1 1500 0 1 1 1 875 1 0 0 0 1550 1 0 0 0 950 1 0 0 1 1600 1 0 0 1...

Page 19: ...0 1 0 0 700 1 15 1300 1 0 1 0 1 750 1 20 1500 1 0 1 1 0 800 1 25 N A 1 0 1 1 1 850 1 30 N A 1 1 0 0 0 875 1 1 0 0 1 950 1 1 0 1 0 1050 1 1 0 1 1 1150 1 1 1 0 0 1250 1 1 1 0 1 1350 1 1 1 1 0 1400 1 1 1...

Page 20: ...1 7 68 1 50 25 70 020H XX 53 1 103 1 60 110 46 5 43 3 89 8 50 45 90 C 2000CFM None 5 5 15 15 5 5 15 15 005H XX 30 30 35 35 26 7 26 7 30 30 008H XX 44 6 44 6 45 45 39 3 39 3 40 40 010H XX 55 55 60 60 4...

Page 21: ...Thermostat Y1 C Y1 W2 Typical 2 Stage Air Conditioner with Variable Speed Air Handler Typical 2 Stage Heat Pump with Variable Speed Air Handler Y2 Y2 Y2 Y2 OUT W E R Air Conditioner Air Handler Air C...

Page 22: ...age Control Board MB7BM Models Figure 11 Two Stage Control Board MB7EM VM Models LED 1 BLWDTC BLWDTC_R HEAT COOL EAC L 1 L 2 P2 R C G W Y 3A Fuse HEATER P1 C R G Y2 Y O 1W 2W 1Y L LED 1 HEATER P1 L 2...

Page 23: ...W C EXPANSION PORT R RED GREEN TEST PORT BLOWER MOTOR RED INPUTS COOL HEAT FAN SPEED OUTPUTS STATUS LIGHTS 2 3 4 5 6 7 8 OFF ON A B GREEN RED STATUS NOT USED TEST PORT BLOWER MOTOR R C Y1 TWIN DEHUM...

Page 24: ...PLUG HOUSING WHEN HEATER KIT NOT INSTALLED BLACK RED WHITE BROWN BROWN BLACK WHITE RED GRAY YELLOW WHITE GREEN GRAY RED NOTES 1 The blower motor speed tap connection may not be as shown See the Insta...

Page 25: ...2 3 4 5 6 9 PIN HOUSING 9 PIN PLUG 6 PIN PLUG HARNESS BLACK WHITE GRAY RED BLACK RED WHITE BLACK MOTOR 6 PIN PLUG HARNESS WHITE BLACK BLUE GREEN YELLOW ORANGE RED BROWN BLUE GREEN ORANGE RED BROWN YE...

Page 26: ...R BLACK WHITE 6 PIN PLUG 6 PIN PLUG BLACK WHITE BLACK WHITE GRAY RED BLACK HARNESS HARNESS GREEN BROWN RED ORANGE YELLOW GREEN BLUE BROWN RED ORANGE YELLOW GREEN BLUE RED CUT WIRES TO REMOVE PLUG HOU...

Page 27: ...delay W Y AUX HEAT On 5 KW Stage 1 Heat on instantly Cool blower on after 3 second delay 10 KW Stage 1 Heat on instantly Cool blower on after 3 second delay Stage 2 Heat on after 5 seconds delay 15 KW...

Page 28: ...ly Blower off after 15 second delay W1 W2 EHEAT On 5 KW Stage 1 Heat on instantly Heat blower on after 3 second delay 10 KW Stage 1 Heat on instantly Heat blower on after 3 second delay Stage 2 Heat o...

Page 29: ...off instantly Heat blower turns off after 40 second delay W1 W2 Y Y2 AUX HEAT On 5 KW Stage 1 Heat on instantly Cool blower on after 3 second delay 10 KW Stage 1 Heat on instantly Cool blower on afte...

Page 30: ...30...

Page 31: ...31...

Page 32: ...Replaces 7091750 ATTENTION INSTALLERS It is your responsibility to know this product better than your customer This includes being able to install the product according to strict safety guidelines and...

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