Engineered air EngA G-TRAC2, Инструкция по установке, эксплуатации и обслуживанию, Страница: 6 / 42

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G-TRAC2
IOM-25 6 of 42 Mar 99 R7
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G-TRAC2
Report any errors, omissions, etc. to Engineered Air – Calgary Service at (403) 287-4775 or FAX (403) 287-4799.
Warranty will only be honored when a qualified HVAC service person, who has received training on the G-TRAC2 is
employed for service and troubleshooting. If further information is required please contact the nearest Engineered Air
office.
I. APPLICATION
The G-TRAC2 is designed to control larger capacity high turndown “DG” indirect fired burners applied to heating, vent
and/or MUA applications.
II. SERVICE
Do not adjust pots or dip switches unless you are familiar with operation, effect, and how to return to correct setting. Just
noting settings will not allow return to the exact position on some pots, which require special instruments to set.
Before servicing, the technician should be familiar with the following points in this guide:

The GTRAC-2 internal fuse should be checked if the control is dead when 24 VAC is on "T1 and T2". (Section XXIII)

System Timings (Section V)

Basic Operation (Section IV)

Status Lights (Section IX)

Temperature Readout (Section XIX)

Calculated Set-Point (Section XVIII)

Auto Bypass Low Limit (Section X
)
III. RESET DISCHARGE AIR TEMPERATURE
Some G-TRAC2's accept reset signals from other devices that can reset discharge air temperature. Refer to the unit wiring
diagram and GTRAC-2 label, to determine if room thermostats, return thermostats, remote set-points, ambient resets,
building management resets
(BMS) , etc., are in use. If used, refer to appropriate reset information in this guide.
IV. GENERAL DESCRIPTION
The G-TRAC2 is a programmed logic controller designed for use with the Engineered Air DG series heaters. This control
package provides temperature, supply blower, and burner control. The G-TRAC2 eliminates the mechanical linkages
between the combustion air and gas actuator by using direct drive floating point.
The G-TRAC2 is not intended to be
retrofitted on jobs with the older G-TRAC/V9055 gas valve combination.
Operation
On start-up the G-TRAC2 opens the dampers and starts the blower after a time delay. If there were a call for heat the
combustion blower would operate at full air to purge the heat exchanger. After the heat exchanger is purged, the air and
gas operators move to “light off position”. The G-TRAC2 closes contacts to activate a flame supervision device. This device
activates the ignition, supervises the pilot flame and main flame. After the main flame is activated a “feedback” signal to G-
TRAC2 terminal 3 allows the G-TRAC2 to modulate the heat as required maintaining the discharge temperature set point. If
there is an optional reset device attached, it electronically modifies the discharge air set point. The “calculated set point”