Goodman MH8 - Page 3

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Table of Contents
CIRCULATING AIR AND FILTERS .................................................................................................................... 22
D
UCTWORK - AIR FLOW ...................................................................................................................... 22
CHECKING DUCT STATIC ..................................................................................................................... 22
FILTERS - READ THIS SECTION BEFORE INSTALLING THE RETURN AIR DUCTWORK ............................................ 23
U
PRIGHT INSTALLATIONS ..................................................................................................................... 23
C
IRCULATION AIR FILTERS ................................................................................................................... 23
HORIZONTAL INSTALLATIONS ................................................................................................................ 23
S
EQUENCE OF OPERATION (INTEGRATED IGNITION CONTROL) ................................................................................ 23
P
OWER UP ...................................................................................................................................... 23
HEATING MODE ................................................................................................................................. 24
(M
ODE DIP SWITCH IS SET TO “1 STG” POSITION) .................................................................................. 24
(M
ODE DIP SWITCH IS SET TO “2 STG” POSITION) ................................................................................. 24
COOLING MODE ................................................................................................................................24
FAN ONLY MODE .............................................................................................................................. 25
START-UP PROCEDURE AND ADJUSTMENT ....................................................................................................... 25
FURNACE OPERATION .......................................................................................................................... 25
FURNACE START-UP ........................................................................................................................... 25
FURNACE SHUTDOWN ......................................................................................................................... 25
GAS SUPPLY PRESSURE MEASUREMENT .................................................................................................. 25
GAS MANIFOLD PRESSURE MEASUREMENT AND ADJUSTMENT ....................................................................... 28
GAS INPUT RATE MEASUREMENT (NATURAL GAS ONLY) ............................................................................ 29
TEMPERATURE RISE ........................................................................................................................... 29
CIRCULATOR BLOWER SPEED ADJUSTMENT ............................................................................................. 30
CIRCULATOR BLOWER FAN TIMING A DJUSTMENT ...................................................................................... 30
SETTING FURNACE OPERATING MODE (*DH8, *ME8, AND *MH8 MODELS ONLY) ............................................ 30
OPERATIONAL CHECKS .............................................................................................................................. 31
BURNER FLAME ................................................................................................................................31
AUXILIARY LIMIT CONTROL ................................................................................................................. 31
SAFETY CIRCUIT DESCRIPTION .................................................................................................................... 31
GENERAL ......................................................................................................................................... 31
INTEGRATED CONTROL MODULE ............................................................................................................. 31
PRIMARY LIMIT ................................................................................................................................31
AUXILIARY LIMIT ............................................................................................................................... 31
ROLLOUT LIMITS .............................................................................................................................. 32
PRESSURE SWITCHES ......................................................................................................................... 32
FLAME SENSOR ................................................................................................................................32
TROUBLESHOOTING ................................................................................................................................... 32
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS ................................................................................... 32
DIAGNOSTIC CHART ........................................................................................................................... 32
FAULT RECALL ................................................................................................................................32
RESETTING FROM LOCKOUT ................................................................................................................ 32