3
TABLE OF CONTENTS
1. INTRODUCTION
Model Identification Code ........................................ 4
Serial Number Identification .................................... 4
Clearances and HUD Requirements ....................... 5
Unit specifications ................................................... 5
2. CIRCULATING AIR SUPPLY
Return air requirements .......................................... 6
Blower performance data ........................................ 6
Supply air systems .................................................. 7
3. VENTING AND COMBUSTION AIR
Roofjack selection ................................................... 7
Roofjack troubleshooting ......................................... 7
Application of high wind and arctic caps .................. 8
4. ELECTRICAL WIRING
Line voltage ............................................................. 8
Low voltage ............................................................. 9
5. GAS SUPPLY,CONVERSION AND LIGHTING
M1G,M1M MODELS
Gas piping ............................................................. 10
Gas conversion nat to LP ...................................... 10
Gas safety nat and LP ........................................... 11
Derating for high altitude ....................................... 11
Proper pilot lighting M1G only ............................... 12
Leak checking gas line .......................................... 12
6. ACCESSORIES
Relay boxes .......................................................... 13
Cooling blowers ..................................................... 13
Furnace accessories for package unit add on ....... 13
Fan timer kit .......................................................... 13
All Weather Cap ................................................... 13
7. SEQUENCE OF OPERATION , COMPONENT PARTS
AND TROUBLESHOOTING, M1G
STANDING PILOT MODEL M1G
Troubleshooting flow chart M1G-056-070 ............. 15
Troubleshooting flow chart M1G-077-090 ............. 16
Sequence of operation heating .............................. 17
TROUBLESHOOTING
Power supply ........................................................ 17
Transformer .......................................................... 17
On-off switch and fan switch ................................. 17
Low voltage wiring ................................................. 18
Limit controls ......................................................... 18
Combustion air relay, 077 and 90 only .................. 18
Combustion air blower, 077 and 90 only ............... 18
Pressure switch, 077 and 90 only ......................... 18
Burner assembly ................................................... 19
Gas valve .............................................................. 20
Pilot assembly, Thermocouple, and Venturi .......... 20
Fan switch ............................................................. 21
Blower assembly ................................................... 21
Heat exchanger ..................................................... 22
Pilot outage ........................................................... 22
Pilot Outage Chart ................................................. 23
WIRING DIAGRAMS
M1G, Natural Draft, AC adaptable ........................ 24
M1G, Natural Draft, AC ready .............................. 24
M1G, Forced Draft, AC adaptable ........................ 25
M1G, Forced Draft, AC ready ............................... 25
8. HOT SURFACE IGNITION SYSTEM MODEL M1M
Troubleshooting flow chart .................................... 27
Sequence of operation heating .............................. 28
TROUBLESHOOTING
Power supply ........................................................ 28
Transformer .......................................................... 28
Low voltage wiring ................................................. 29
Limit controls ......................................................... 29
Intergrated control board ....................................... 29
Combustion air blower .......................................... 31
Pressure switch ..................................................... 32
Hot surface ignitor ................................................. 33
Burner assembly ................................................... 33
Gas valve .............................................................. 33
Blower assembly ................................................... 34
Heat exchanger ..................................................... 34
WIRING DIAGRAM
M1M, All ................................................................ 35
