MG2S Installation Manual

2
TABLE OF CONTENTS
IMPORTANT SAFETY INFORMATION ..................... 3
GENERAL INFORMATION ........................................ 4
Requirements & Codes .......................................... 4
Clearances to Combustible Materials ..................... 5
Combustion Air Quality ........................................... 5
Heating Load .......................................................... 5
COMBUSTION AIR & VENTING REQUIREMENTS . 6
Important Information ............................................. 7
Category IV Appliances .......................................... 7
Direct Vent Installation ............................................ 7
Vent Pipe Length & Diameter ............................ 7
Vent Pipe Material ............................................. 8
Vent Pipe Installation ........................................ 8
Outdoor Terminations - Horizontal Venting ....... 8
Outdoor Terminations - Vertical Venting ........... 9
Vent Freezing Protection ................................... 10
Existing Installations .......................................... 10
Ventilaire III or IV Air Quality Package ................... 10
CIRCULATING AIR REQUIREMENTS ...................... 11
Plenums & Air Ducts ............................................... 11
Supply Air Connections .......................................... 11
Return Air Connections .......................................... 11
Closet & Alcove Installations .................................. 11
Furnace Filter ......................................................... 12
Dampers ................................................................. 12
FURNACE INSTALLATION ....................................... 14
About The Furnace ................................................. 14
Before You Install this Furnace .............................. 14
Locating the Unit ..................................................... 14
Locating & Cutting Floor Openings ................... 15
Locating & Cutting Ceiling Openings ................ 15
Installing Finger Tabbed Duct Connectors ............. 15
Narrow Duct Attachment - Option 1 .................. 16
Narrow Duct Attachment - Option 2 .................. 16
Installing Screw-Down Duct Connectors ................ 16
Round Duct Connector Installation ......................... 16
Installing the Furnace ............................................. 17
Condensate Drainage ............................................. 17
GAS SUPPLY & PIPING ............................................ 18
Leak Check ............................................................. 19
High Altitude Application ......................................... 20
Converting to LP/Propane Gas at Altitudes
between 0 & 10,000 FT. ......................................... 20
ELECTRICAL WIRING .............................................. 21
Line Voltage Wiring ................................................ 21
Grounding ............................................................... 22
Thermostat / Low Voltage Connections .................. 22
Single Stage AC & Single Stage Thermostat .... 22
Single Stage AC & Two Stage Thermostat ....... 22
Autostaging for Single Stage Thermostats ............. 22
Autostaging for Two-Stage Thermostats ................ 22
Fixed Speed Blower Applications ...................... 23
START-UP & ADJUSTMENTS .................................. 23
Pre-Start Check List ............................................... 23
Start-up Procedures ............................................... 23
Verifying & Adjusting Input Rate ............................. 23
Verifying & Adjusting Temperature Rise ................. 24
Verifying Burner Operation ..................................... 24
Verifying Operation of the Supply Air Limit Switch . 25
OPERATING SEQUENCE ......................................... 25
Heating Cycle ......................................................... 25
Cooling Cycle ......................................................... 25
Fan Mode ............................................................... 26
MAINTENANCE ......................................................... 26
TROUBLESHOOTING ............................................... 27
FURNACE COMPONENTS ....................................... 28
FIGURES & TABLES ................................................. 29
Figure 23. BW Series Dimensions .................... 29
Figure 24. BWT Series
(w/ Top Return Air) Dimensions .......... 30
Airflow Data ............................................................ 31
Table 6. Blower Performance - Front Return .... 31
Table 7. Blower Performance - Top Return ...... 32
Electircal Diagrams & Data ..................................... 33
Table 8. Wire Length & Voltage Specifications . 33
Figure 25. Line Voltage Field Wiring ................. 33
Figure 26. MG2S Motor Control Board ............. 33
Figure 27. Two-Stage Furnace Control Board .. 33
Figure 28. MG2S Wiring Diagram ..................... 34
Gas Information ...................................................... 35
Table 9. Gas Flow Rates ................................... 35
Table 10. Gas Pipe Capacities .......................... 35
Table 11. Liquid Propane Conversion Chart ..... 36
Table 12. Natural Gas Heating Values .............. 36
Table 13. Orifices for Natural
Gas High Heating Value ...................... 36
Table 14. High Altitude Deration Chart
for Natural Gas - Low heating Value ... 36
Venting Information ................................................ 37
Table 15. Vent Termination Clearances ............ 37
Figure 29. Horizontal / Vertical Venting &
Clearances from Soffit ....................................... 38
INSTALLATION CHECKLIST .................................... 40