1F72-151
1F79-111
CONFIGURATION AND
TERMINAL OUTPUTS
Mounting
hole
Reset Operation 1F72-151
If a voltage spike or static discharge blanks out
the display or causes erratic thermostat opera-
tion, you can reset the thermostat by pressing
,
and TIME at the same time.
W903
Clip to
Disable
EMR
W903
O/B
Terminal
Switches
Selection
Reset Operation 1F79-111
Feature
If a voltage spike or static discharge blanks out
the display or causes erratic thermostat opera-
tion, you can reset the thermostat by pressing
W906 for Emergency
Heat Second Stage
Fan Control
,
and at the same time when system
W904
Clip for
Celsius
Mounting
hole
is switched from “OFF” to “HEAT” position.
W905
Clip for
Slow Cycle
Thermostat base
Configuration Menu
Displayed
1F79-111
Step
Press
or
to select:
1F72-151
Step
1F79-111
1F72-151
(Factory Default)
Press Button(s)
Press Button(s)
COMMENTS
Set SYSTEM
switch to OFF
and
1
2
FA
PRGM
Select Fast (on) or slow (off) Second
Stage Heat
1
2
3
OFF
for at least 2 seconds
(ON)
and RUN
CL
(OFF)
and
momentarily
and
momentarily
3
4
Select Compressor lockout OFF or ON
ON
HOLD *
HOLD *
0 HI
(0)
Select temperature display adjustment
higher or lower
3 LO TO
3 HI
dL
(ON)
and
4*
5
HOLD **
RUN
Select display backlight OFF or ON
Return to normal operation
5*
6
OFF
momentarily
Move SYSTEM
switch from OFF
* Not available on earlier models
** Press HOLD to advance to next item or TIME to move backwards to previous item
THERMOSTAT
L
O/B
Y
G
W2
E
C
R
SYSTEM
See Note **
SYSTEM
MONITOR
SWITCH
Changeover
Relay*
Fan
Relay
Emergency
Relay
Aux
Relay
Compressor
Contactor
(Stage 2)
Hot
24 VAC
120 VAC
Neutral
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
TRANSFORMER
(Class II)
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Typical wiring diagram for single transformer systems
NOTE
If safety circuits are in only one of the systems, remove
the transformer of the system with NO safety circuits.
THERMOSTAT
SYSTEM
L
O/B
Y
G
W2
E
C
R
CUT AND
TAPE OFF!
SYSTEM
MONITOR
SWITCH
See Note **
Changeover
Relay*
Fan
Relay
Limit or
Safety
Switches
Emergency
Relay
HOT
120 VAC
NEUTRAL
24 VAC
Aux
Relay
(Stage 2)
Compressor
Contactor
Hot
24 VAC
120 VAC
Neutral
TWO COMMONS MUST
BE JUMPERED TOGETHER!
TRANSFORMER
(Class II)
* Changeover Relay is energized in COOL when O/B switch is in the “O” position
Changeover Relay is energized in HEAT when O/B switch is in the “B” position
** Jumper required to use a single Aux Heat for both Second Stage Heat and Emergency
Typical wiring diagram for two transformer systems with NO safety circuits
ꢀ88
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