Nordyne MB7BM Series User Manual

2
IMPORTANT SAFETY INFORMATION .......................3
GENERAL INFORMATION ..........................................3
Requirements & Codes .............................................3
About the Air Handler ................................................3
Before You Install this Equipment ..............................4
Minimum Clearances .................................................4
Locating the Air Handler ............................................4
Operation of an Air Handler During Construction ......4
Plenums & Air Ducts .................................................5
Supply Air Connections ..........................................5
Return Air Connections ..........................................5
Acoustical Duct Work .............................................5
Air Filters ................................................................6
Unconditioned Spaces ...........................................6
Condensate Drainage ..............................................6
AIR HANDLER INSTALLATION ..................................6
Upflow Installation .....................................................6
Downflow Installation .................................................7
Horizontal Installation ................................................8
Horizontal Left Installations ....................................8
Horizontal Right Installations .................................8
ELECTRICAL CONNECTIONS ...................................9
Pre-Electrical Checklist .............................................9
Line Voltage ...............................................................9
Thermostat Connections ...........................................9
Control Board ..........................................................10
Twinning ...............................................................10
Heater Kits...............................................................10
Electronic Air Cleaner..............................................10
Humidifier ................................................................10
Optional Humidistat .................................................10
Grounding................................................................10
STARTUP & ADJUSTMENTS ...................................11
Before You Start the Air Handler..............................11
Air Circulation Check ...............................................11
Running the Blower Continuously ........................11
System Cooling ....................................................11
System Heating .................................................... 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 Heating Airflow ...........................12
Selecting Basic Cooling/Heat Pump Airflow .........12
Dehumidification Options ........................................12
UNIT MAINTENANCE ................................................13
TROUBLESHOOTING ...............................................13
FIGURES & TABLES .................................................14
Figure 7. MB7 Series Dimensions ........................14
Figure 8. MB7 Series Components ......................15
Blower Performance Data .......................................16
Table 4. MB7BM Airflow Data ............................... 16
Table 5. MB7EM Airflow Data ............................... 17
Table 6. MB7EM Airflow Settings (Heat Only) ......18
Table 7. MB7VM Airflow Settings (Cool Only) ......18
Table 8. MB7VM Airflow Data ............................... 19
Electrical Data & Diagrams .....................................20
Table 9. MCA & MOP Data ...................................20
Figure 9. Typical T-Stat Connections ....................21
Figure 10. Single Stg. C.B. (MB7BM) ...................22
Figure 11. Single Stg. C.B. MB7(EM & VM)..........22
Figure 12. Two Stg. Fixed Sp. M.C.B. (EM) ...........23
Figure 13. Two Stg. Var. Sp. M.C.B. (VM) ..............23
Figure 14. Wiring Diagram (BM Models) ..............24
Figure 15. Wiring Diagram (EM Models) ..............25
Figure 16. Wiring Diagram (VM Models) ..............26
Table 10. MB7BM Heating Element Logic ............27
Table 11. MB7(EM & VM) Heat Element Logic .....28
INSTALLATION / PERFORMANCE CHECKLIST .....32
TABLE OF CONTENTS

Nordyne MB7BM Series Specifications

General

Brand	Nordyne
Model	MB7BM Series
Category	Air Handlers
Language	English