White Rodgers 1F78-151 Installation and Operation Instructions

Installation Instructions for

Heating & Air Conditioning

1F78

5/2 Day Programmable Thermostat

YOUR THERMOSTAT REPLACES

	Typical System Compatibility Chart	1E78
	Standard Heat Only Two Wire Gas or Oil Fired Systems (24 volt)	Yes
	Electronic Ignition Heat Only Two Wire Systems (24 volt)	Yes
	Electronic Ignition Heat Only Gas or Oil Fired Systems (24 volt)	Yes
	Standard Heat/Cool Systems (24 volt)	Yes
	Heat/Cool Systems Electric Heat (24 volt)	Yes
	Heat Only Electric Heat Systems (24 volt)	Yes
	Cool Only Systems (24 volt)	Yes
	Heat Pump Systems (No Aux. or Emergency Heat)	Yes
	Hot Water Zone Heat Only (Two Wire) Systems	Yes
	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	Yes
	12 VDC Mobile Home Application	Yes
	Multistage Systems	No
	Systems Exceeding 30VAC, 1.5 Amp	No

CONTENTS
Preparations...................................................	1
Thermostat Details.........................................	1
Removing Old Thermostat.............................	1
Mounting and Wiring......................................	2
Check Thermostat Operation.........................	3
Programming your Thermostat.......................	4
Specifications.................................................	6
Troubleshooting..............................................	6
1 PREPARATIONS
Assemble tools required below.

FLAT BLADE SCREWDRIVER

HAND OR

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

hole

	-	+	-		+
W903 Clip to
Disable EMR				W RH	B	RC
Feature
W904 Clip for	W903
	W904
Celsius Display
Mounting				G	O	Y
hole		W905
				ELEC GAS
	W905 Clip for			Electric/Gas
	Hydronic System			Switch

NOTE: Earlier models refer to 37-7006 for jumper locations.

Figure 1. Thermostat base

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.

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.

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.

PART NO. 37-6614C

www.white-rodgers.com	Replaces 37-6614B
www.emersonclimate.com	1027

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 locations 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.

! 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		Other Manufacturers’
Terminal Designation		Terminal Designation
RH	4	RH	M	*	*
				R5	R
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.

Energy Management Recovery (EMR)

This thermostat is set to operate with EMR. This causes the thermostat to start the heating or cooling system early to have the room temperature reach the program setpoint at the time the period is to start.

To disable EMR, clip jumper W903 (see Fig. 1).

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.

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 pre-

mium 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.

www.white-rodgers.com

4 MOUNTING AND WIRING

CONTINUED FROM SECOND PAGE

JUMPER

WIRE

B O Y G

THERMOSTAT

W RC RH

SYSTEM

Fan

Heating

Relay

System

Hot

NOTE

24 VAC

120 VAC

For 2-wire Heat only,

Neutral

attach to RH and W

TRANSFORMER

Figure 2. Typical wiring diagram for heat only, 3-wire, single transformer systems

					JUMPER
					WIRE
	B	O	Y	G W	RC RH	THERMOSTAT
						SYSTEM
			Cooling	Fan
			System	Relay		Hot
					24 VAC	120 VAC
						Neutral
					TRANSFORMER

Figure 3. Typical wiring diagram for cool only, 3-wire, single transformer systems

			NOTE
RED jumper wire (provided with thermostat) must be
connected between thermostat RH and RC terminals									JUMPER
for proper thermostat operation with this system.									WIRE
B	O		Y			G		W	RC RH
			Cooling			Fan		Heating
			System			Relay		System

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
		Cooling	Fan	Heating			Hot
						24 VAC	120 VAC
		System	Relay	System
							Neutral
							HEATING
						TRANSFORMER
							Hot
						24 VAC	120 VAC
							Neutral
						COOLING TRANSFORMER

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
					SYSTEM
	Reversing	Compressor	Fan
	Valve*	Contactor	Relay		Hot
				24 VAC	120 VAC
	* Reversing valve is energized when the				Neutral
	system switch is in the COOL position			TRANSFORMER

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
						SYSTEM
	Reversing	Compressor		Fan
	Valve*		Contactor	Relay		Hot
					24 VAC	120 VAC
	* Reversing valve is energized when the					Neutral
	system switch is in the HEAT position				TRANSFORMER

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 to adjust temperature setting below room temperature. The heating system should stop operating.

www.white-rodgers.com

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.

3Time button.

4PRGM (program) button.

5RUN (program) button.

6HOLD button.

7FAN switch (ON, AUTO).

8SYSTEM switch (COOL, OFF, HEAT).

The Display

9 Indicates day of the week.

10 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.

11Alternately displays current time and temperature.

12 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.

13Displays currently programmed set temperature (this is blank when SYSTEM switch is in the OFF position).

14“HOLD”mode. is displayed when the thermostat is in the HOLD

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 PROGRAM STORAGE — When programming, you can enter both your heating and cooling programs at the same time. There is no need to reprogram the thermostat at the beginning of each season.

•TEMPERATURE OVERRIDE— Press or until the display shows the temperature you want. The thermostat will override current programming and keep the room temperature at the selected temperature until the next program period begins. Then the thermostat will automatically revert to the program.

•HOLD TEMPERATURE — The thermostat can hold any temperature within its range for an indefinite period, without reverting to the programmed temperature. Press HOLD button. “HOLD” will be displayed. Then choose the desired temperature by pressing or . The thermostat will hold the room temperature at the selected setting until you press the RUN button to start program operation again.

FAN SYSTEM

ON AUTO COOL OFF HEAT

Figure 8. Thermostat display, buttons, and switches

•Energy Management Recovery — Energy Management Recovery (EMR) causes the thermostat to start heating or cooling early to make the building temperature reach the program setpoint at the time you specify. Heating will start 5 minutes early for every 1° of temperature required to reach setpoint. Cooling will start approximately 15 minutes early for every 1° because it takes longer to reach temperature. Clipping W903 jumper will disable EMR.

Example: You select EMR and have your heating programmed to 65° at night and 70° at 7 AM. If the building temperature is 65° the difference between 65° and 70° is 5°. Allowing 5 minutes per degree the thermostat setpoint will change to 70° at 6:35 AM.

•°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.

•TEMPERATURE DISPLAY ADJUSTMENT — Your new thermostat has been accurately set in our factory. However, if you wish, you may adjust your new thermostat temperature dis-

www.white-rodgers.com

play to match your old thermostat. This can be accomplished (within a ±3° range) as follows:

1.Press PRGM and RUN buttons at the same time.

2.Press or to adjust the displayed temperature to your desired setting.

3.Press RUN to resume normal program operation.

•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 TIME and RUN buttons at the same time. The display will show “d-L” and “OFF” alternately.

2.Press or to change “OFF” to “ON” 

6 PROGRAMMING YOUR THERMOSTAT

This section will help you plan your thermostat’s program to meet your needs. For maximum comfort and efficiency, keep the following guidelines in mind when planning your program.

•When heating (cooling) your building, program the temperatures to be cooler (warmer) when the building is vacant or during periods of low activity.

•During early morning hours, the need for cooling is usually minimal.

Look at the factory preprogrammed times and temperatures shown below. If this program will suit your needs, simply press the RUN button to begin running the factory preset program.

If you want to change the preprogrammed times and temperatures, follow these steps.

Determine the time periods and temperatures for your weekday and weekend programs.You must program four periods for both the weekday and weekend program. However, you may use the same heating and cooling temperatures for consecutive time periods.You can choose start times, heating temperatures, and cooling temperatures independently for both weekday and weekend programs (for example, you may select 5:00 AM and 70° as the weekday 1st period heating start time and temperature, and also choose 7:00 AM and 76° as the weekday 1st period cooling start time and temperature). Use the table at the bottom of the page to plan your program time periods and the temperatures you want during each period. You may also want to look at the sample program table to get an idea of how the thermostat can be programmed.

SAMPLE

Heating/Cooling Schedule Plan (Factory Program)

			WEEKDAY (5 DAY)		WEEKEND (2 DAY)
	Period		Start		Start
			Time	Temperature	Time	Temperature
		1ST	6:00 AM	70 F	6:00 AM	70 F
HEAT
		2ND	8:00 AM	62 F	8:00 AM	62 F
		3RD	5:00 PM	70 F	5:00 PM	70 F
		4TH	10:00 PM	62 F	10:00 PM	62 F
		1ST	6:00 AM	78 F	6:00 AM	78 F
COOL
		2ND	8:00 AM	85 F	8:00 AM	85 F
		3RD	5:00 PM	78 F	5:00 PM	78 F
		4TH	10:00 PM	82 F	10:00 PM	82 F

Entering Your Program

Follow these steps to enter the heating and cooling programs you have selected.

Set Current Time and Day

1. Press TIME button once. The display will show the hour only.

EXAMPLE: PM

2.Press and hold either or until you reach the correct hour and AM/PM designation (AM begins at midnight; PM begins at noon).

3.Press TIME once. The display window will show the minutes only.

EXAMPLE:

4.Press and hold either or until you reach the correct minutes.

5.Press TIME once. The display will show the day of the week.

6.Press or until you reach the current day of the week.

7.Press RUN once. The display will show the correct time and room temperature alternately.

Enter Heating Program

1.Move the SYSTEM switch to HEAT.

2.Press PRGM once.“A” (indicating weekday program) will appear in the display. Also displayed are the currently programmed start time for the 1st heating period and the currently programmed temperature (flashing).

	MO TU WE TH FR
EXAMPLE:	AM

This display window shows that for the 1st weekday period, the start time is 6:00 AM, and 70° is the programmed temperature (this example reflects factory preprogramming).

3.Press or to change the displayed temperature to your selected temperature for the 1st heating program period.

4.Press TIME once (the programmed time will flash). Press or until your selected time appears. The time will change in 15 minute increments. When your selected time is displayed, press TIME again to return to the change temperature mode.

5.Press PRGM once. The currently programmed start time and setpoint temperature for the 2nd heating program period will appear.

Heating/Cooling Schedule Plan

	WEEKDAY (5 DAY)		WEEKEND (2 DAY)
Period	Start		Start
	Time	Temperature	Time	Temperature
1ST

	HEAT	3RD
		2ND
		4TH
		1ST
COOL COOL
		3RD
		2ND
		4TH

www.white-rodgers.com