A G-TRAC2 MANUAL
General Manual Revised: 03/15/99
Ambient Based Discharged Air Set Point Reset Curves
In order for the discharge air temperature to go from zero reset to maximum reset, (up or down) the ambient
temperature has to change by 40°F.
Make/Break Resets and Overrides
1. “OR” and “V” Override (Day Only)
DAY OPERATION ONLY (Dipswitch A-3 should be on).
NOTE: This will not operate with intermittent night blower, terminal “K” energized.
• With the contact closed, discharge temperature is at 120ºF.
• With contact open, discharge temperature is as per the set point dial plus any
other reset options values that are activated.
This simpler version of the make/break override options is the one that closes a contact between the G-TRAC
terminals "OR" and "V". This is designed to operate as an override for day operation and will drive the discharge
temperature up to 120º when the contacts for the thermostat are closed. When the thermostat is not calling, the
discharge temperature value is that shown on the temperature set point dial (either the G-TRAC mounted dial or the
optional remote dial).
This set up is designed for a daytime override where you have the fan operating continuously. It does not respond
to terminal “K” for night heat operation. If you attempt to operate this as a night-time override, the heat cannot
start because the supply fan is not operating. Additional steps must be taken for night operation.
You can take the following additional steps to operate the control as a night heat package:
• The "OR" and "V" operation looks for the fan to be running before it can start the heat. It has no internal
method of starting the fan.
• If it is the intent to use this option as a night heat function, you must have the room thermostat operate a relay
that will close G-TRAC contacts "OR" and "V" as well as have a second set of contacts that will re-establish
power to the "FS" terminal.
• When the "FS" terminal is powered, the G-TRAC will see that the fan is operating and it will bring on the heat
to operate at 120ºF-discharge temperature until the room thermostat is satisfied.
or Contact
-20°F
0°F
20°F
40°F 60°F
80°F
Warmer Set Point
Maximum Up Reset
Ambient Temperature
No Reset
Cooler
(30 Seiten)
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