Installation Instructions for
Heating & Air Conditioning
1F78
Non-Programmable Thermostat
YOUR THERMOSTAT REPLACES
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Typical System Compatibility Chart |
1F78 |
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Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt) |
Yes |
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Electronic Ignition Heat Only Two Wire Systems (24 volt) |
Yes |
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Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt) |
Yes |
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Standard Heat/Cool Systems (24 volt) |
Yes |
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Heat/Cool Systems Electric Heat (24 volt) |
Yes |
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Heat Only Electric Heat Systems (24 volt) |
Yes |
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Cool Only Systems (24 volt) |
Yes |
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Heat Pump Systems (No Aux or Emergency Heat) |
Yes |
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Hot Water Zone Heat Only (Two Wire) Systems |
Yes |
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Hot Water Zone Heat Only (Three Wire) Systems |
No |
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Line Voltage Heating or Baseboard 110/240 Volt Systems |
No |
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Millivolt Systems Floor or Wall Furnaces |
Yes |
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12 VDC Mobile Home Application |
Yes |
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Multistage Systems |
No |
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Systems Exceding 30VAC, 1.5 Amp |
No |
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CONTENTS |
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Preparations .................................................. |
1 |
Thermostat Details ........................................ |
1 |
Removing Old Thermostat............................. |
1 |
Mounting and Wiring...................................... |
2 |
Check Thermostat Operation......................... |
3 |
Specifications ................................................ |
5 |
Troubleshooting ............................................. |
5 |
1 PREPARATIONS
Assemble tools required below.
FLAT BLADE SCREWDRIVER
HAND OR PO
DRILL WITH
DRILL BIT, IF NEEDED
WIRE CUTTER/STRIPPER
Failure to follow and read all instructions carefully before installing or operating this control could cause personal injury and/or property damage
2 THERMOSTAT DETAILS
Mounting
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+ |
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+ |
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W RH |
B |
RC |
W904 |
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Clip for |
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Celsius |
W904 |
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Display |
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G |
O |
Y |
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W905 |
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3 REMOVING OLD THERMOSTAT
! CAUTION
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.
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ELEC GAS |
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Mounting |
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2. |
Shut off electricity at the main fuse box until installation is |
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complete. Ensure that electrical power is disconnected. |
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hole |
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Remove the front cover of the old thermostat. With wires still |
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W905 Clip |
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3. |
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for Hydronic |
Electric/Gas |
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attached, remove wall plate from the wall. If the old thermostat |
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System |
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Switch |
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has a wall mounting plate, remove the thermostat and the wall |
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NOTE: Earlier models refer to 37-7006 for jumper locations. |
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mounting plate as an assembly. |
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Figure 1. Thermostat |
4. |
Identify each wire attached to the old thermostat using the |
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labels enclosed with the new thermostat. |
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5. |
Disconnect the wires from the old thermostat one at a time. DO |
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NOT LET WIRES FALL BACK INTO THE WALL. |
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6. |
Install new thermostat using the following procedures. |
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www.white-rodgers.com |
PART NO. 37-6615C |
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Replaces 37-6615B |
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www.emersonclimate.com |
1028 |
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3 REMOVING OLD THERMOSTAT
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.
4 MOUNTING AND WIRING
!WARNING
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.
! CAUTION
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.
TERMINAL CROSS REFERENCE CHART
New Thermostat |
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Other Manufacturers’ |
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Terminal Designation |
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Terminal Designation |
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RH |
4 |
RH |
M |
* |
* |
R5 |
R |
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RC |
R |
R |
V |
- |
- |
G |
G |
G |
F |
G |
G |
W |
W |
W |
H |
4 |
W |
Y |
Y |
Y |
C |
Y6 |
Y |
*These are four-wire, single-transformer systems. Factory installed jumper wire between the RH and RC terminals must remain in place.
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
CONTINUED FROM SECOND PAGE
JUMPER
WIRE
THERMOSTAT
B |
O |
Y |
G |
W |
RC RH |
SYSTEM |
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Fan |
Heating |
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Relay |
System |
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Hot |
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NOTE |
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24 VAC |
120 VAC |
For 2-wire Heat only, |
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Neutral |
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attach to RH and W |
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TRANSFORMER |
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Figure 2. Typical wiring diagram for heat only, 3-wire, single transformer systems
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JUMPER |
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WIRE |
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B |
O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Cooling |
Fan |
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System |
Relay |
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Hot |
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24 VAC |
120 VAC |
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Neutral |
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TRANSFORMER |
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Figure 3. Typical wiring diagram for cool only, 3-wire, single transformer systems
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NOTE |
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RED jumper wire (provided with thermostat) must be |
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connected between thermostat RH and RC terminals |
JUMPER |
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for proper thermostat operation with this system. |
WIRE |
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B |
O |
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Y |
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G |
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W |
RC RH |
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Cooling |
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Fan |
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Heating |
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System |
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Relay |
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System |
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24 VAC
THERMOSTAT
SYSTEM
Hot
120 VAC
Neutral
TRANSFORMER
Figure 4. Typical wiring diagram for heat/cool, 4-wire, single transformer systems
THERMOSTAT
B |
O |
Y |
G |
W |
RC |
RH |
SYSTEM |
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Cooling |
Fan |
Heating |
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Hot |
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24 VAC |
120 VAC |
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System |
Relay |
System |
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Neutral |
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HEATING |
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TRANSFORMER |
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Hot |
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24 VAC |
120 VAC |
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Neutral |
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COOLING TRANSFORMER |
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Figure 5. Typical wiring diagram for heat/cool, 5-wire, two-transformer systems
JUMPER |
JUMPER |
WIRE |
WIRE |
B O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Reversing |
Compressor |
Fan |
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Valve* |
Contactor |
Relay |
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Hot |
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24 VAC |
120 VAC |
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* Reversing valve is energized when the |
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Neutral |
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system switch is in the COOL position |
TRANSFORMER |
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Figure 6. Typical wiring diagram for heat pump with reversing valve energized in COOL
JUMPER |
JUMPER |
WIRE |
WIRE |
B |
O |
Y |
G W |
RC RH |
THERMOSTAT |
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SYSTEM |
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Reversing |
Compressor |
Fan |
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Valve* |
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Contactor |
Relay |
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Hot |
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24 VAC |
120 VAC |
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* Reversing valve is energized when the |
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Neutral |
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system switch is in the HEAT position |
TRANSFORMER |
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Figure 7. Typical wiring diagram for heat pump with reversing valve energized in HEAT
5 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.
Cooling System
! CAUTION
To prevent compressor and/or property damage, if the outdoor temperature is below 50°F, DO NOT operate the 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 
to adjust thermostat setting below room temperature. The blower should come on immediately on high speed, followed by cold air circulation
3.Press 
to adjust temperature setting above room temperature. The cooling system should stop operating.
Heating System
1.Move SYSTEM switch to HEAT position. If the heating system has a standing pilot, be sure to light it.
2.Press
to adjust thermostat setting above room temperature. The heating system should begin to operate.
3.Press
toadjusttemperaturesettingbelowroomtemperature. The heating system should stop operating.
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5 CHECK THERMOSTAT OPERATION
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
1(Up arrow) Raises temperature setting.
2(Down arrow) Lowers temperature setting.
3FAN switch (ON, AUTO).
4SYSTEM switch (COOL, OFF, HEAT).
The Display
5
is displayed when the SYSTEM switch is in the HEAT position. 
is displayed (non-flashing) when the SYSTEM switch is in the COOL position. 
is displayed (flashing) when the compressor is in lockout mode.
6Displays current temperature.
7
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.
8Displays currently set temperature (this is blank when SYSTEM switch is in the OFF position).
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.
•SIMULTANEOUSHEATING/COOLINGSETPOINTSTORAGE
— 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 
or 
until the 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 
. When the batteries are low, 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.
1
2
FAN SYSTEM
ON AUTO COOL OFF HEAT
3 4
6 |
8 |
7 |
5 |
Figure 8. Thermostat display, buttons, and switches
•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 
or 
at the same time for two seconds with the SYSTEM switch in OFF position.
2.Press 
or 
to adjust the displayed temperature to 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 
and 
at the same time for two seconds 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.
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