Engineered air EngA G-TRAC2 User Manual

A G-TRAC2
IOM-25 13 of 42 Mar 99 R7
The values for “FS and HS”, service switch and flame supervision device are noted on the following table. Terminal “K” is
OFF (not powered) for this “Daytime Operation Table”, thus the control is operating in day mode. Dipswitch A-4
determines supply fan configuration (as noted above).
NOTE
FS Fan
SW
HS SW
Serv.
SW
Term. K
Low Limit
Flame Fail
Config. Dip Sw A-4
open
Temp. Priority
Config. Dip Sw A-4
closed
Air Flow Priority
1
XX
XX
XX
Lock Out
XX
Unit locked off on
L/L.*
Unit locked off on
L/L.*
2, 3, 6
ON
OFF
OFF
OFF
(day)
Enabled
NO
Discharge > 40ºF,
blower delays on (64
sec.). Discharge <
40ºF, blower stays
off.
S/A Blower instant
on. Low limit
functional. No
damper delay.
3, 4, 5
ON
XX
OFF
OFF
(day)
Enabled
YES
Unit locked off on
F/F.
S/A Blower remains
operational as long as
the discharge
temperature is over
40ºF.
3
ON
ON
OFF
OFF
(day)
Enabled
NO
If heat call, S/A
Blower delays on
after main flame. If
no heat call, blower
delays on (64 sec.).
After on, uses
standard G-TRAC
blower function
described below.
S/A Blower delays on
(64 sec.).
OFF
XX
XX
XX
XX
XX
Unit switched off.
Unit switched off.
3, 4, 5
ON
XX
ON
OFF
(day)
Enabled
Disabled
Blower delays on
after main flame (64
sec.).
S/A Blower delays on
(64 sec.).
 XX means that switch can be either on or off.
GENERAL DETAIL OF ABOVE TABLE
Note 1 Unit is “off” on low limit.
Note 2 In “day” operation, when the unit starts up, if the discharge sensor is warm the supply air fan will start in
64 seconds unless dipswitch A-4 is closed.
Note 3 If the heat switch is on and there is an immediate heat call (or a heat call within the first two minutes of
the blower starting), the blower will shut off or remain off until the burner has been running for 64
seconds. If during this time the heat call is lost, the blower will cycle back on but the pre-purge will
continue. The supply fan may cycle a few times before the heat starts depending on dipswitch A-4
position.
Note 4 If there is a heat call while the heat switch is off, and the discharge temperature is not below 40°F, the G-
TRAC2 will ignore the requirements for having the burner on before the supply blower is started.
Note 5 If the discharge temperature is below 40°F and the heat switch is off, the G-TRAC2 will not start the
blower until the discharge sensor rises above 40°F. If the low limit is set in the activated position
(dipswitch C-5 “on”). Note that this assumes the low limit bypass is still timing.
Note 6 If the discharge sensing temperature falls below 40°F after the unit has started the unit will shut down in
12 seconds, but is not locked out. If the discharge temperature warms up the unit will restart.
Fan Damper at Night (Terminal “K” Powered)
For night operation, use the following chart.

Engineered air EngA G-TRAC2 Specifications

General

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