2
TABLE OF CONTENTS
Important Safety Information ....................................2
Requirements & Codes ..............................................3
General Information ...................................................4
Before You Install this Unit .........................................4
Locating the Indoor Blower ........................................4
Minimum Clearances .................................................4
Operation of Indoor Blower 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
Indoor Blower Installation .........................................6
Upfl ow Installation .....................................................6
Downfl ow Installation .................................................7
Horizontal Installation ................................................8
Horizontal Left Installations ....................................8
Horizontal Right Installations .................................8
Electrical Connections ...............................................9
Pre-Electrical Checklist .............................................9
Line Voltage ...............................................................9
Grounding..................................................................9
Thermostat Connections ...........................................9
Control Board ..........................................................10
Twinning ...............................................................10
Heater Kits...............................................................10
Optional Humidistat .................................................11
Startup & Adjustments ............................................13
Before You Start the Unit .........................................13
Air Circulation Check ...............................................13
Running the Blower Continuously ........................13
System Cooling ....................................................13
System Heating ....................................................13
Turning the Blower Off..........................................13
Blower Confi gurations .............................................13
Determining Nominal System Capacity ...............13
Proper Blower Speed for Multi-speed Units .........13
Variable Speed Units ............................................14
Selecting Continuous Low Speed Operation .......14
Selecting Basic Cooling/Heat Pump Airfl ow ............14
Selecting Minimum Electric Heat Airfl ow .................14
Selecting the Delay Profi le ......................................14
Unit Maintenance ......................................................15
Troubleshooting ........................................................15
Figures & Tables .......................................................16
The information listed below is for reference purposes only
and does not necessarily have jurisdiction over local or state
codes. Always consult with local authorities before installing
any gas appliance.
Duct Systems
• US and CANADA: Air Conditioning Contractors Association
(ACCA) Manual D, Sheet Metal and Air Conditioning
Contractors National Association (SMACNA), or American
Society of Heating, Refrigeration, and Air Conditioning
Engineers (ASHRAE) Fundamentals Handbook
Electrical Connections
• US: National Electrical Code (NEC) ANSI/NFPA 70
• CANADA: Canadian Electrical Code CSA C22.1
General Installation
• US: Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Association
Inc., Batterymarch Park, Quincy, MA 02269; or American
Gas Association, 400 N. Capitol, N.W., Washington DC
20001 or www.NFPA.org
• CANADA: NSCNGPIC. For a copy, contact Standard Sales,
CSA International, 178 Rexdale Boulevard, Etobicoke
(Toronto), Ontario, M9W 1R3 Canada
Safety
• US: (NFGC) NFPA 54–1999/ANSI Z223.1 and the
Installation Standards, Warm Air Heating and Air
Conditioning Systems ANSI/NFPA 90B.
• CANADA: CAN/CGA-B149.1 and .2–M00 National
Standard of Canada. (NSCNGPIC)
Figure 7. MB6 Series Dimensions ........................16
Figure 8. MB6 Series Components ......................17
Blower Performance Data .......................................18
Table 4. MB6BM Airfl ow Data ...............................18
Table 5. MB6EM Airfl ow Data ...............................19
Table 6. MB6VM Airfl ow Data ...............................20
Table 7. MB6VM Min. Elec. Heat Airfl ow ..............20
Table 8. MB6VM Delay Settings ...........................20
Electrical Diagrams .................................................21
Figure 9. MB6(BM&VM) Control Board ................21
Figure 10. MB6EM Control Board ........................21
Figure 11. Variable Speed Control Board .............22
Figure 12. MB6BM Wiring Diagram ......................23
Figure 13. MB6EM Wiring Diagram ......................24
Figure 14. MB6VM Wiring Diagram ......................25
Installation / Performance Checklist .......................28
