A
G-TRAC2
IOM-25
14 of 42
Mar 99 R7
Damper operation depends on fan switch position “ON”. This opens dampers when the supply fan is on.
NOTE
FS Fan
SW
HS
Heat
SW
Service
SW
Low
Limit
Flame
Fail
Configure Dip
Switch 1-4
OPEN
Temperature
Priority
Configure Dip
Switch 1-4 CLOSED
Air Flow Priority
Terminal K
1
ON
ON
OFF
Lock Out
N/A
Unit locked off
on L/L.*
Unit locked off on
L/L. *
OFF
OFF
OFF
Enabled
XX
Unit switched
off.
Unit switched off.
ON
(night)
6
OFF
ON
OFF
Enabled
NO
Intermittent
S/A fan delays
on 64 sec.
After main
flame starts.
Call is from
room
thermostat.
Intermittent S/A
fan delays on 64
sec. After main
flame starts. Call is
from room
thermostat.
ON
(night)
6
ON
XX
ON
Enabled
Disabled
Blower delays
on after main
flame
(64
sec.)
.
S/A Blower delays
on
(64 sec.)
.
To reset a low limit and flame failure, remove power from terminals HS and FS at the same time and remove power from T1 and T2. Turning off
switch at remote control panel can usually do this.
NOTE
:
On some applications with large amounts of outside air being switched while unit is in day time operation,
terminal “K” may be switched to simulate coming out of night function. This will reactive the six minute
low limit bypass thus allowing the heat to catch up to falling discharge air temperatures if cold outside air
has been introduced into the system.
XIII. BASIC BURNER OPERATION
1.
The basic burner-operating scheme is as follows:
The burner cannot start until one of the following conditions is present.
a.
Safeties OK, heat call, fan and heat switch on.
(Day mode)
b.
Safeties OK, heat call, heat and night switch on.
(Night mode)
c.
Safeties OK, Service mode and fan switch on.
(Manual)
d.
Safeties OK, Service mode and night switch on.
(Safeties includes valid combustion air switch output (must be open)
and valid discharge sensor)
