emerson 1F78 Installation Instructions
Installation Instructions for
Typical System Compatibility Chart 1F78
Standard Heat Only Tw o Wire Gas or Oil Fired Systems (24 volt) Ye s
Electronic Ignition Heat Only Tw o Wire Systems (24 volt) Ye s
Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) Ye s
Standard Heat/Cool Systems (24 volt) Ye s
Heat/Cool Systems Electric Heat (24 volt) Ye s
Heat Only Electric Heat Systems (24 volt) Ye s
Cool Only Systems (24 volt) Ye s
Heat Pump Systems (No Aux or Emergency Heat) Ye s
Hot Water Zone Heat Only (Two Wire) Systems Ye s
Hot Water Zone Heat Only (Three Wire) Systems No
Line Voltage Heating or Baseboard 110/240 Volt Systems No
Millivolt Systems Floor or Wall Furnaces Ye s
12 VDC Mobile Home Application Ye s
Multistage Systems No
Systems Exceding 30VAC, 1.5 Amp No
2
Mounting
hole
Mounting
hole
W904
Clip for
Celsius
Display
W905 Clip
for Hydronic
System
Electric/Gas
Switch
W
RH
BRC
G
O
Y
+
-
+
-
GAS
ELEC
W904
W905
Figure 1. Thermostat
NOTE: Earlier models refer to 37-7006 for jumper locations.
HAND OR POWER
DRILL WITH 3/16 INCH
DRILL BIT, IF NEEDED
FLAT BLADE SCREWDRIVER
WIRE CUTTER/STRIPPER
1
CAUTION
!
3
Heating & Air Conditioning
1F78
Non-Programmable Thermostat
CONTENTS
Preparations .................................................. 1
Thermostat Details ........................................ 1
Removing Old Thermostat ............................. 1
Mounting and Wiring ...................................... 2
Check Thermostat Operation ......................... 3
Specifications ................................................ 5
Troubleshooting ............................................. 5
YOUR THERMOSTAT REPLACES
THERMOSTAT DETAILS
PREPARATIONS
Assemble tools required below.
Failure to follow and read all instructions carefully
before installing or operating this control could cause
personal injury and/or property damage
REMOVING OLD THERMOSTAT
To prevent electrical shock and/or equipment damage,
disconnect electrical power to the system at the main fuse
or circuit breaker until installation is complete.
Before removing wires from old thermostat’s switching subbase,
label each wire with the terminal designation it was removed
from.
1. Remove Old Thermostat: A standard heat/cool thermostat
consists of three basic parts:
a. The cover, which may be either a snap-on or hinge type.
b. The base, which is removed by loosening all captive screws.
c. The switching subbase, which is removed by unscrewing
the mounting screws that hold it on the wall or adaptor plate.
2. Shut off electricity at the main fuse box until installation is
complete. Ensure that electrical power is disconnected.
3. Remove the front cover of the old thermostat. With wires still
attached, remove wall plate from the wall. If the old thermostat
has a wall mounting plate, remove the thermostat and the wall
mounting plate as an assembly.
4. Identify each wire attached to the old thermostat using the
labels enclosed with the new thermostat.
5. Disconnect the wires from the old thermostat one at a time. DO
NOT LET WIRES FALL BACK INTO THE WALL.
6. Install new thermostat using the following procedures.
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PART NO. 37-6615C
Replaces 37-6615B
1028
3
REMOVING OLD THERMOSTAT
4
WARNING
!
CAUTION
!
TERMINAL CROSS REFERENCE CHART
New Thermostat
Terminal Designation
Other Manufacturers’
Terminal Designation
RH
RC
G
W
Y
4
R
G
W
Y
RH
R
G
W
Y
M
V
F
H
C
R5
-
G
4
Y6
R
-
G
W
Y
**
* These are four-wire, single-transformer systems.
Factory installed jumper wire between the RH
and RC terminals must remain in place.
CONTINUED FROM FIRST PAGE
ATTENTION! This product does not contain mercury. However, this
product may replace a unit which contains mercury.
Do not open mercury cells. If a cell becomes damaged, do not
touch any spilled mercury. Wearing non-absorbent gloves, take up
the spilled mercury and place into a container which can be sealed.
If a cell becomes damaged, the unit should be discarded.
Mercury must not be discarded in household trash. When the unit
this product is replacing is to be discarded, place in a suitable
container. Refer to www.white-rodgers.com for location to send
product containing mercury.
MOUNTING AND WIRING
Do not use on circuits exceeding specified voltage. Higher
voltage will damage control and could cause shock or fire
hazard.
Do not short out terminals on gas valve or primary control
to test. Short or incorrect wiring will damage thermostat
and could cause personal injury and/or property damage.
Thermostat installation and all components of the system
shall conform to Class II circuits per the NEC code.
Electric Heat or Single-Stage
Heat Pump Systems
This thermostat is configured from the factory to operate a heat/
cool, fossil fuel (gas, oil, etc.), forced air system. It is configured
correctly for any system that DOES NOT require the thermostat
to energize the fan on a call for heat. If your system is an electric
or heat-pump system that REQUIRES the thermostat to turn on
the fan on a call for heat, locate the GAS/ELECTRIC switch (see
fig. 1) and switch it to the ELECTRIC position. This will allow the
thermostat to energize the fan immediately on a call for heat. If you
are unsure if the heating/cooling system requires the thermostat
to control the fan, contact a qualified heating and air conditioning
service person.
Hydronic (Hot Water or Steam)
Heating Systems
This thermostat is set to operate properly with a forced-air heating
system. If you have a hydronic heating system (a system that heats
with hot water or steam), you must set the thermostat to operate
properly with your system.
The factory default setting is forced air heat. Clipping jumper W905
on the circuit board will produce a longer heating cycle which is
normally for hot water or steam (hydronic) systems. Both settings
produce a very accurate temperature control and can be set to
your personal preference. As received, the thermostat cycles the
system just under 1°F. With W905 clipped, the system cycles at
approximately 1.5°F.
Take care when securing and routing wires so they do not
short to adjacent terminals or rear of thermostat. Personal
injury and/or property damage may occur.
Attach Thermostat Base to Wall
1. Remove the packing material from the thermostat. Gently pull the
cover straight off the base. Forcing or prying on the thermostat
will cause damage to the unit. If necessary, move the electric
heat switch (see ELECTRIC HEAT SYSTEMS, above).
2. Connect wires beneath terminal screws on base using
appropriate wiring schematic (see figs. 2 through 7).
3. Place base over hole in wall and mark mounting hole locations
on wall using base as a template.
4. Move base out of the way. Drill mounting holes.
5. Fasten base loosely to wall, as shown in fig. 1, using two
mounting screws. Adjust until level, and then tighten screws.
(Leveling is for appearance only and will not affect thermostat
operation.) If you are using existing mounting holes, or if holes
drilled are too large and do not allow you to tighten base snugly,
use plastic screw anchors to secure subbase.
6. Push excess wire into wall and plug hole with a fire-resistant
material (such as fiberglass insulation) to prevent drafts from
affecting thermostat operation.
Battery Location
This thermostat requires 2 “AAA” alkaline batteries to operate. If
is displayed, the batteries are low and should be
replaced. For best results, replace batteries once a year with new
premium brand alkaline batteries such as Duracell® or Energizer®.
To replace the batteries, install the batteries along the top of the
base (see fig. 1). The batteries must be installed with the positive (+)
ends to the right.
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4
MOUNTING AND WIRING
RH
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 2. Typical wiring diagram for
heat only, 3-wire, single transformer systems
TRANSFORMER
Heating
System
Fan
Relay
Y
RC
JUMPER
WIRE
OB
For 2-wire Heat only,
attach to RH and W
NOTE
RH
Y
24 VAC
120 VAC
Hot
Neutral
TRANSFORMER
THERMOSTAT
SYSTEM
G W
Figure 3. Typical wiring diagram for
cool only, 3-wire, single transformer systems
Cooling
System
Fan
Relay
RCOB
JUMPER
WIRE
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 4. Typical wiring diagram for
heat/cool, 4-wire, single transformer systems
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
RC
JUMPER
WIRE
OB
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals
for proper thermostat operation with this system.
NOTE
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 5. Typical wiring diagram for
heat/cool, 5-wire, two-transformer systems
HEATING
TRANSFORMER
Heating
System
Fan
Relay
Cooling
System
RC
24 VAC
120 VAC
Hot
Neutral
COOLING TRANSFORMER
OB
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 6. Typical wiring diagram for heat pump
with reversing valve energized in COOL
TRANSFORMER
Reversing
Valve*
RCOB
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
* Reversing valve is energized when the
system switch is in the COOL position
Fan
Relay
RH
Y
24 VAC
120 VAC
Hot
Neutral
THERMOSTAT
SYSTEM
G W
Figure 7. Typical wiring diagram for heat pump
with reversing valve energized in HEAT
TRANSFORMER
Reversing
Valve*
RCOB
JUMPER
WIRE
Compressor
Contactor
JUMPER
WIRE
* Reversing valve is energized when the
system switch is in the HEAT position
Fan
Relay
5
CAUTION
!
CONTINUED FROM SECOND PAGE
CHECK THERMOSTAT OPERATION
NOTE
To prevent static discharge problems, touch side of thermostat to release static build-up before touching any keys.
If at any time during testing your system does not operate properly,
contact a qualified service person.
Fan Operation
If your system does not have a G terminal connection, skip to
Heating System.
1. Turn on power to the system.
2. Move FAN switch to ON position. The blower should begin to
operate.
3. Move FAN switch to AUTO position. The blower should stop
immediately.
To prevent compressor and/or property damage, if the
outdoor temperature is below 50°F, DO NOT operate the
cooling system.
Cooling System
This thermostat has a time delay between cooling cycles to allow
the head pressure in the compressor to stabilize. If the temperature
is adjusted to call for cool within 5 minutes of the last cycle the
snowflake icon will blink indicating the thermostat is locked out. After
3 to 5 minutes, the compressor will start and the snowflake icon will
stop flashing. This helps prevent the compressor from cycling too
quickly and is normal operation for the thermostat.
1. Move SYSTEM switch to COOL position.
2. Press
The blower should come on immediately on high speed, followed
by cold air circulation
3. Press
temperature. The cooling system should stop operating.
1. Move SYSTEM switch to HEAT position. If the heating system
has a standing pilot, be sure to light it.
2. Press
The heating system should begin to operate.
3. Press
The heating system should stop operating.
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to adjust thermostat setting below room temperature.
to adjust temperature setting above room
Heating System
to adjust thermostat setting above room temperature.
to adjust temperature setting below room temperature.
5
CHECK THERMOSTAT OPERATION
1
2
3
4
5
6
7
8
FANSYSTEM
OFFON AUTO COOL HEAT
1
4
57
3
2
86
Figure 8. Thermostat display, buttons, and switches
CONTINUED FROM THIRD PAGE
Before you begin using your thermostat, you should be familiar
with its features and with the display and the location and operation
of the thermostat buttons. Your thermostat consists of two parts:
the thermostat cover and the base. To remove the cover, gently
pull it straight out from the base. To replace the cover, line up the
cover with the base and press gently until the cover snaps onto the
base.
The Thermostat Buttons and Switches
(Up arrow) Raises temperature setting.
(Down arrow) Lowers temperature setting.
FAN switch (ON, AUTO).
SYSTEM switch (COOL, OFF, HEAT).
The Display
is displayed when the SYSTEM switch is in the HEAT
position.
switch is in the COOL position.
when the compressor is in lockout mode.
Displays current temperature.
is displayed when the 2 “AAA” batteries are low
and should be replaced. Nothing else will be displayed. Earlier
models display “LO BATTERY”. Refer to 37-7006.
Displays currently set temperature (this is blank when
SYSTEM switch is in the OFF position).
is displayed (non-flashing) when the SYSTEM
is displayed (flashing)
Operating Features
Now that you are familiar with the thermostat buttons and display,
read the following information to learn about the many features of
the thermostat.
• SIMULTANEOUS HEATING/COOLING SETPOINT STORAGE
— You can enter both your heating and cooling setpoints at the
same time. There is no need to re-enter the thermostat at the
beginning of each season.
• TEMPERATURE SETTING — Press
display shows the temperature you want. The thermostat will
keep the room temperature at the selected temperature.
• °F/°C CONVERTIBILITY — The factory default setting is
Fahrenheit. Clipping W904 jumper on the circuit board (see fig.
1) will alter this feature to Celsius temperature setting.
• LOW BATTERY INDICATOR — If the 2 “AAA” alkaline
batteries are low and should be replaced, the display will be
blank except for
pressing any button will cause the display to operate for ten
seconds. After ten seconds, the display will be blank except
for . After has been displayed for
4 weeks, the thermostat will raise the temperature 10° above
your setpoint in COOL mode and drop the temperature 10°
below your setpoint in HEAT mode. You cannot program with
low batteries, but you can override setpoint temperature.
. When the batteries are low,
or until the
• TEMPERATURE DISPLAY ADJUSTMENT — Your new
thermostat has been accurately set in our factory. However,
if you wish, you may adjust your new thermostat temperature
display to match your old thermostat. This can be accomplished
(within a ±3° range) as follows:
1. Press
the SYSTEM switch in OFF position.
2. Press
your desired setting.
3. Move SYSTEM switch from OFF to exit the feature.
• DISPLAY BACKLIGHT — (Not available on earlier models.)
The display backlight improves display contrast in low lighting
conditions. Selecting backlight ON will turn the light on for
a short period of time after any button is pressed. Selecting
backlight OFF (default) will keep the light off. Turn the display
backlight feature ON as follows:
1. Press
with the SYSTEM switch in HEAT position. The display will
alternately show “-L” AND “FF” (off).
2. Press or to change “FF” to “ON”.
3. Move SYSTEM switch to OFF to exit the feature.
or at the same time for two seconds with
or to adjust the displayed temperature to
and at the same time for two seconds
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