Engineered air EngA G-TRAC2 User Manual

A G-TRAC2
IOM-25 19 of 42 Mar 99 R7
as per both the setting of pot 5 and the discharge set point. The calculated discharge air set point (dial setting + reset) is
limited between 48°F and 120ºF.
To determine the amount of reset available use the following chart (See page 21).
EXAMPLE: G-TRAC2 set point 70°F
Reset Ratio Pot set at 3 (total reset 29°: +18 is upper reset limit, -11 is lower reset limit)
Room thermostat set at 72°F
Discharge set point is 65°
 If actual room temperature sensor is at 72ºF (satisfied), there is no reset. The unit discharges at 70ºF.
 If room gradually cools so sensor is 3º colder (67ºF), discharge temperature resets up the full amount of its authority
(+18) to 88ºF.
 If room only cooled to 70ºF (2 degrees) the new discharge temperature would be  * 18 = 12°. Therefore 12° + 65ºF
set point = 77º discharge.
 If the room had warmed above the temperature of the room thermostat, a similar reset action would occur except the
discharge temperature would be reduced.
Diagram A
Discharge Operating Range
Absolute lowest
allowed discharge set
point
Lower reset limit
Manual Set point
Ex 70°F
Upper reset limit
Absolute highest
allowed discharge
set point
120°F
48°F
Same as Diagram A but demonstrates reset moves Up and Down with Manual Set Point.
Manual Set Point has been turned to 80° in this example.
Diagram B
Discharge Operating Range
Absolute lowest
allowed discharge set
point
Lower
reset limit
Manual Set point
Ex 80°F
Upper reset limit
Absolute highest
allowed discharge
set point
120°F
48°F

Engineered air EngA G-TRAC2 Specifications

General

Brand	Engineered air
Model	EngA G-TRAC2
Category	Controller
Language	English