Emerson 1F78H User Manual
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have a time delay built in and do not require this feature. Your
compressor manufacturer can tell you if the feature is already
present in their system. When the compressor time delay
compressor manufacturer can tell you if the feature is already
present in their system. When the compressor time delay
occurs it will flash the
for about five minutes then turn on
the compressor.
5)
Select Temperature Display Adjustment 4 LO to 4 HI—
Allows you to adjust the room temperature display 4
Allows you to adjust the room temperature display 4
°
higher
or lower. Your thermostat was accurately calibrated at the
factory but you have the option to change the display tem-
perature to match your previous thermostat.
factory but you have the option to change the display tem-
perature to match your previous thermostat.
6)
Select F
°
or C
°
Readout—Changes the display readout to
Centigrade or Fahrenheit as required.
7
ELECTRICAL DATA
Electrical Rating:
Electrical Rating:
20 to 30 VAC 50/60 Hz.
0.05 to 1.2 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
0.05 to 1.2 Amps (Load per terminal)
1.5 Amps Maximum Total Load (All terminals combined)
THERMAL DATA
Setpoint Temperature Range: 45
Setpoint Temperature Range: 45
°
F to 90
°
F (7
°
C to 32
°
C)
Operating Ambient Temperature Range: 32
°
F to 105
°
F
Operating Humidity Range: 0 to 90% RH (non-condensing)
Shipping Temperature Range: -40
Shipping Temperature Range: -40
°
F to 150
°
F
SPECIFICATIONS
Press or to select:
SL
OFF
ON
4 LO to 4 HI
C
Configuration Menu
Step
1
2
3
4
5
6
7
Press Button(s)
Set system switch
to OFF
and
and
and
and
and
Move system
switch from OFF
to HEAT or COOL
Displayed (Factory Default)
(FA)
d-L (ON)
LOC (OFF)
0 HI (0)
(F)
Comments
System switch must be OFF to configure thermostat
Select FA or SL (Fast or Slow) heating cycle rate
N/A
Select compressor lockout OFF or ON
Select temperature display adjustment higher or lower
Select temperature display to F or C
Returns to normal operation
* Press
and
simultaneously to advance to next item
8
TROUBLESHOOTING
Symptom
Possible Cause
Corrective Action
No Heat/No Cool/No Fan
1. Blown fuse or tripped circuit breaker.
Replace fuse or reset breaker.
(common problems)
2. Furnace power switch to OFF.
Turn switch to ON.
3. Furnace blower compartment door or
Replace door panel in proper position to engage
panel loose or not properly installed.
safety interlock or door switch.
No Heat
1. Pilot light not lit.
Re-light pilot.
2. System Switch not set to Heat.
Set System Switch to Heat and raise temperature
above room temperature.
above room temperature.
3. Loose connection to thermostat or system.
Verify thermostat and system wires are securely
attached.
attached.
4. Furnace Lock-Out Condition. Heat may also
Many furnaces have safety devices that shut down
be intermittent.
when a lock-out condition occurs. If the heat works
intermittently contact the furnace manufacturer or
local service person for assistance.
intermittently contact the furnace manufacturer or
local service person for assistance.
5. Heating system requires service or
Diagonistic: Set System Switch to Heat and raise
thermostat requires replacement.
the setpoint above room temperature. Within a few
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermo-
stat is operating properly. If the thermostat does
not click on, contact your heating and cooling
service person or place of purchase for a
replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify
the heating is operating correctly.
seconds the thermostat should make a soft click
sound. This sound usually indicates the thermo-
stat is operating properly. If the thermostat does
not click on, contact your heating and cooling
service person or place of purchase for a
replacement. If the thermostat clicks, contact the
furnace manufacturer or a service person to verify
the heating is operating correctly.