A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
VI. SYSTEM TIMINGS
Pre-purge 75 seconds at 85% opening
Maintained purge 5 minutes
Supply fan start delay (damper open time) 64 seconds
Heat exchanger warm up time 64 seconds
Burner cool down time 45 seconds
Heat exchanger cool down time 1 or 2 min (automatically selected by temperature at
discharge)
Flame fail Usually 15 seconds (it is set by flame relay)
Flame fail light 90 seconds from ignition command
Auto Low limit Bypass (from blower start) 5 minutes 30 second anti-cycle timer
VII. BLOWER AIR AND GAS MODULATION
As a gas valve or damper opens or closes, the flow through the device changes in a non-linear fashion. This
varying flow rate normally creates set up and operating problems. Advanced technology in the G-TRAC2 corrects
these issues.
The G-TRAC2 monitors both the gas and air operator positions and calculates the corrected flow rates.
Modulating adjustments of the gas and air are based on flow rates through gas valves and dampers, not on
degrees of control rotation that other systems use. This allows the G-TRAC2 to maintain an accurate set up
through out the complete combustion range. Combustion set up is now easier, faster, and more accurate than
was previously possible.
Refer to Section XXII for set-up procedures and Section XXIII for information changing operators or G-TRAC2’s in
the field.
VIII. DIP SWITCHES
The G-TRAC2 has three dip switch blocks (each block has 5 switches). The individual switches are numbered
from 1 through 5 and are used for the following purposes:
Dip Switch Block A
Is accessible from the large opening on the G-TRAC label. Switch 1 of Block A is located on the right hand side.
The switches are used to activate the following functions:
A-1 BMS reset (0
10 VDC, 2 10 VDC, 4-20 ma).
A-2 Ambient reset.
A-3 Room reset.
A-4 Supply Fan configuration switch. (At start-up and during operation "ON" maintains airflow as a priority, to
pressurize space. "OFF” the discharge temperature has priority).
NOTE: If the airflow has priority then the supply fan doesn’t shut down if the discharge temperature is too
cold. (Often selected as per day/night configuration chart.) This statement applies to the G-TRAC-
2 control starting up from a cold start.
A-5 Service mode - If this switch is ‘on’ the ‘Heat Required’ light will be flashing, erratically, indicating the
control is in a service mode.
(30 Seiten)
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