A G-TRAC2
IOM-25 2 of 42 Mar 99 R7
TABLE OF CONTENTS
I. APPLICATION ....................................................................................................................................................................... 6
II. SERVICE ............................................................................................................................................................................ 6
III. RESET DISCHARGE AIR TEMPERATURE ........................................................................................................................... 6
IV. GENERAL DESCRIPTION ................................................................................................................................................... 6
OPERATION ................................................................................................................................................................................. 6
BASIC FEATURES ........................................................................................................................................................................... 7
V. WIRING ............................................................................................................................................................................ 7
VI. SYSTEM TIMINGS............................................................................................................................................................. 8
VII. BLOWER AIR AND GAS MODULATION ............................................................................................................................ 8
VIII. DIP SWITCHES .................................................................................................................................................................. 8
DIP SWITCH BLOCK A .................................................................................................................................................................... 8
DIP SWITCH BLOCK “B” – FUEL CURVES/AIR CURVES .......................................................................................................................... 9
GAS CURVES ......................................................................................................................................................................... 9
AIR CURVES .......................................................................................................................................................................... 9
DIPSWITCH BLOCK “C” – LOW LIMIT, PI, CTRAC, 010 VDC CONTROL ............................................................................................... 9
IX. POTS ............................................................................................................................................................................... 10
X. STATUS LIGHTS .............................................................................................................................................................. 10
LED 1 BURNER PRE-PURGE .......................................................................................................................................................... 10
LED 2 HEAT REQUIRED ................................................................................................................................................................ 11
LED 3 LOCKOUT FLAME FAILURE OR LOW LIMIT ............................................................................................................................... 11
LED 4 BURNER .......................................................................................................................................................................... 11
XI. AUTO BYPASS LOW LIMIT ............................................................................................................................................. 12
XII. DAY AND NIGHT OPERATING STRATEGIES ................................................................................................................... 12
SUPPLY FAN, DAMPER AND HEAT OPERATION .................................................................................................................................. 12
Standard G-TRAC2 Supply Fan Function (Temperature Priority Program) ........................................................................ 12
Day/Night General Description of Fan/Damper Operation ............................................................................................... 12
Fan/Damper During Day (Terminal “K” No Power) Dipswitch A-4 .................................................................................... 12
Fan Damper at Night (Terminal “K” Powered) ................................................................................................................... 13
XIII. BASIC BURNER OPERATION .......................................................................................................................................... 14
1. THE BASIC BURNER-OPERATING SCHEME IS AS FOLLOWS: ............................................................................................................ 14
2. HEAT REQUIRED LED ON .................................................................................................................................................... 16
3. PRE-PURGE LIGHT ............................................................................................................................................................... 16
XIV. TEMPERATURE CONTROL – GENERAL OVERVIEW ....................................................................................................... 17
XV. THE MASTER SET-POINT ................................................................................................................................................ 17
XVI. INDUCED VOLTAGE ON REMOTE CONTROL WIRING ................................................................................................... 17
XVII. NIGHT HEAT THERMOSTATS ..................................................................................................................................... 17
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