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IOM74 November 2020 R105
TABLE OF CONTENTS
GENERAL OVERVIEW .................................... 6
UNIT TYPE ............................................ 6
SELECTOR SWITCH ................................ 6
HEATING AND COOLING – DJ, DG, HE ........... 6
Only required for direct fired appliances. ..... 6
HUMDIFIER VERSION – SH ......................... 7
HARDWARE INFORMATION .......................... 7
COMPUTER CONNECTION ........................... 8
WiFi Connection ................................... 9
TERMINAL DESCRIPTIONS .......................... 10
HEATING COOLING VERSION .................... 10
SH(X) HUMIDIFIER VERSION ...................... 12
OPERATION ............................................. 13
MODE SELECTION ................................... 13
OCCUPIED / UNOCCUPIED ....................... 13
FAN CONTROL ....................................... 13
VARIABLE AIR VOLUME ........................... 13
AIR PROVING SWITCH ............................ 13
WARMUP/COOLDOWN ............................ 14
DAMPER CONTROL .................................. 14
MAKE UP AIR ...................................... 14
DAMPER END SWITCH ............................ 14
AMBIENT COMPENSATION ........................ 14
ECONOMIZER ...................................... 15
MINIMUM DAMPER POSITION .................... 15
HIGH AMBIENT LOCKOUT ........................ 15
LOW LIMIT ........................................... 15
HEATING ............................................. 15
GAS FIRED HEATING .............................. 15
COOLING ............................................. 16
MECHANICAL COOLING ........................... 16
PRESSURE SENSING ................................. 16
GENERAL TIMING .................................... 16
TEMPERATURE CONTROL ........................... 17
ROOM OR RETURN THERMOSTAT ................ 17
2 STAGE ROOM THERMOSTAT ................... 17
REMOTE SETPOINT ................................ 17
BMS SETPOINT ..................................... 17
ALARM RESET ........................................ 17
WIRING CONCERNS .................................. 17
MODULE GROUNDING ............................. 18
COMMUNICATION WIRING ........................ 18
COMMUNICATION WIRE GROUNDING ........... 18
DJ/LARGE SH(X) INDIRECT FIRED ..................... 19
BASIC OPERATION ................................... 19
DJ / CD-XM TIMING .................................. 19
DJ/LARGE SH(X) COMBUSTION SETUP ............ 20
GAS ACTUATOR CALIBRATION ................... 20
COMBUSTION OFFSETS ........................... 20
SMALL SH(X) BURNER SETUP .................. 21
DG INDIRECT FIRED ..................................... 23
BASIC OPERATION ................................... 23
DG TIMING ............................................ 23
DG COMBUSTION SETUP ............................ 24
GAS AND AIR ACTUATOR CALIBRATION......... 24
COMBUSTION OFFSETS ........................... 24
HE DIRECT FIRED ....................................... 26
HE TIMING ............................................ 26
HE BURNER SETUP ................................... 27
MAXITROL VALVE .................................. 27
GAS ACTUATOR CALIBRATION ................... 27
SH / SHX HUMIDIFIER .................................. 29
BASIC OPERATION ................................... 29
S-XM TIMING .......................................... 29
CD-XM .................................................... 30
BASIC OPERATION ................................... 30
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